Musicam Roadrunner User manual

Musicam Roadrunner User manual

CDQ

Prima

U S E R S G U I D E

The Session

Whether manually, or using

CDQ

Prima’s

pre-programmed

Quick Configurations or Speed Dials, getting configured and connected couldn’t be easier

Chapter

6

6. Two Steps To Success

A ny ‘session’, whether just a few seconds or a permanent connection, requires some pre-negotiation with the user at the other end regarding the best possible configuration to use. In most cases, the application will determine the best configuration, but in a few cases, cost or transmission medium will determine the configuration.

Once configured, as outlined in section 6.1, the only thing left to do is connect to another codec, discussed in section 6.2, beginning on page 6-

22.

6.1 Go Configure

Once you have decided on the configuration to use, setting your

CDQ

Prima is as simple as following a few prompts. But first, some

discussions on the various modes available:

6.1.1 Codec Compression Algorithms and Modes

There are currently three coding algorithms used in the

CDQ

Prima.

Each has its advantages and disadvantages. Which algorithm you use depends on a number of factors, including desired audio quality, delay, cost, and compatibility with other codecs. This chapter serves as a guide for choosing the best algorithm and mode for your applications when a choice is available.

CDQ

Prima

U S E R S G U I D E

MPEG Layer III is not available with revision 34.

Only codecs

With Revision 6 hardware support Layer

III

6.1.1.1 Stereo and Dual Mono

Users have expressed a great deal of confusion concerning the differences between stereo, dual mono and joint stereo. From a coding and compression standpoint, stereo and dual mono are identical. That is, half of the total bits are assigned to the left channel, and half of the total bits are assigned to the right channel. Left is always left, and right is always right…no blending, no sound stage manipulations.

6.1.1.2 Joint Stereo

Unlike dual mono or stereo, joint stereo employs real-time bit allocation techniques and dynamically assigns bits to the channels and frequency bands that need them the most. Bits are allocated to the channel and frequency bands that need them on a frame-by-frame basis. This dynamic bit allocation results in considerably wider bandwidths and higher signal-to-noise ratios than possible with the fixed bit allocation of the other modes. If the bit allocation circuitry determines that enough capacity is available for true stereo, then stereo frames will be sent.

Unlike stereo and dual mono, joint stereo may manipulate the left-right sound stage and stereo separation at high frequencies. The infinite leftright sound stage is blended into seven locations at high frequencies should the bit allocation circuitry deem it necessary. However, it has been shown that any spatial blending performed by the bit allocation is in frequency bands where the human auditory system would normally blend stereo signals. This is one of the basic premises behind psychoacoustic modeling. A detailed discussion of joint stereo bit allocation techniques can be found in the

CDQ

Prima Technical

Reference Manual.

After rigorous testing with trained listeners, joint stereo audio has been determined to yield higher perceived audio quality than stereo or dual mono at low bit rates, such as those encountered with single ISDN lines.

6.1.1.3 ISO/MPEG Layer III

Recommended applications for Layer III include:

Connecting to Layer III-only codecs

Mix audition

True stereo over ISDN

High fidelity mono audio at low bit rates

CDQ

Prima

U S E R S G U I D E

Different, high fidelity left and right audio programs

ISO/MPEG Layer III can deliver full duplex, 15 kHz monaural audio using only one 56 or 64 kb/s ISDN ‘B’ channel. At 112 or 128 kb/s, transparent 20 kHz monaural audio is possible. Near-transparent 20 kHz audio is possible in joint-stereo mode. In dual mono or stereo modes, near-transparent 15 kHz audio is obtained.

Although Layer III offers a wider bandwidth than other algorithms at low bit rates, the inherent drawbacks of this algorithm may outweigh this benefit. The disadvantages of using Layer III are long coding delay times and poor cascading ability. In addition, audible artifacts may be noticeable when using Layer III at lower bit rates, and post-processing may further degrade the audio.

At 112 or 128 kb/s, the only advantage of using Layer III over

MUSICAM-enhanced Layer II is that Layer III can deliver true stereo with 15 kHz bandwidth. This makes Layer III ideal for mix auditioning or other applications where high fidelity and true channel separation are required, since no sound-stage manipulation is employed. Other than that, at 112 or 128 kb/s data rates, we recommend using Layer III only when communication with Layer III-only codecs is required. Even at 112 or 128 kb/s, digital artifacts may be noticeable, and the delay, cascading and post-processing limitations are still present.

At bit rates higher than 128 kb/s (not supported with internal terminal adapters), there is no advantage to using Layer III over MUSICAM or standard Layer II. Bit rates up to 320 kb/s are supported for compatibility.

6.1.1.4 MUSICAM and ISO/MPEG Layer II

Recommended applications for MUSICAM-enhanced Layer II:

Studio-to-transmitter links

Voice-over

High-fidelity remotes

Different audio to two locations

Highest quality audio over ISDN

Low delay (single line mode)

The premier coding algorithm used in

CDQ

Prima is MUSICAM,

MUSICAM USA’s enhancement to the ISO/MPEG Layer II encoding algorithm. MUSICAM offers the best possible combination of fidelity,

CDQ

Prima

U S E R S G U I D E moderate delay and excellent transcoding ability at all bit rates.

MUSICAM encoding is fully compatible with all MPEG Layer II codecs, and since the enhancements are a function of the encoder, any decoder will sound better when connected to a

CDQ

Prima.

MUSICAM can deliver full duplex, 10.2 kHz audio on one ‘B’ channel with 24 kHz sampling. Although a narrower bandwidth at 56 and 64 kb/s than MPEG Layer III, the advantages are higher signal-to-noise ratio, higher transparency, lower delay, less noticeable artifacts and better results when transcoding and post-processing. In addition, the

CDQ

Prima allows you to send two different audio programs to two

different locating using this mode.

When using 112 or 128 kb/s, the

CDQ

Prima delivers transparent, 20 kHz

monaural or joint stereo or 10.2 kHz dual mono audio. Recommended for all voice-over work, MUSICAM Layer II at 128 kb/s, monaural, can stand up to extensive post-production and can be re-coded several times before artifacts become noticeable.

At bit rates higher than 128 kb/s, the

CDQ

Prima delivers transparent

stereo with immunity to degradation even after up to 15 cascades (at

384 kb/s).

Please note that the CCSO and CCSN algorithms in the

CDQ

Prima are

all MUSICAM algorithms, but these are used when connecting to early

CCS and MUSICAM USA products manufactured before MPEG Layer

II was standardized.

6.1.1.5 G.722

Recommended applications for G.722:

Sports, news, traffic and weather reporting

• Call-in talk shows

Compatibility with G.722 codecs

Low-delay return audio for high-fidelity remotes

G.722 is one of the earliest audio coding algorithms to be standardized.

G.722 is a relatively simple algorithm based on ADPCM (adaptive pulse code modulation) offering full duplex 7.5 kHz audio over a single

ISDN or Switched-56 channel. The key advantages of G.722 are its compatibility with most other codecs and very low delay times. G.722

is ideal for situations where instantaneous talkback is required, such as dial-in talk shows and distant interviews. The main disadvantages are

CDQ

Prima

U S E R S G U I D E the limited audio fidelity, poor signal-to-noise ratio and poor cascading properties. G.722 is not recommended for music applications.

6.1.1.6 Algorithm, Mode, Bit and Sample Rate

Since no single algorithm/mode/sample rate/bit rate combination is ideal for all applications, the

CDQ

Prima offers several different

combinations, each with advantages and disadvantages. In addition, the full range of available algorithms insures that your

CDQ

Prima can

connect with the widest number of codecs. The tables below compare the available algorithms and bit rates. Recommended algorithm combinations are indicated with a ü. In some instances, especially at lower bit rates, using a lower sample rate will result in better audio, with wider bandwidths and reduced artifacts.

56/64 Kb/s:

Algorithm Sample rate

G.722

Mode Bandwidth

16 kHz mono 7.5 kHz

Delay

very low

MUSICAM 24 kHz mono

MUSICAM 48 kHz mono

MUSICAM 24 kHz JS

Layer III

Layer III

Layer III

32 kHz

48 kHz

32 kHz mono mono

JS

10.2 kHz

8.5 kHz

10 kHz

15 kHz

15 kHz

14 kHz moderate low moderate long long long

Cascade

poor good fair fair fair poor poor

ü

ü

112/128 kb/s:

Algorithm Sample rate

Mode Bandwidth

MUSICAM 48 kHz mono 20 kHz

Delay Cascade

moderate excellent

MUSICAM 48 kHz

MUSICAM 48 kHz

MUSICAM 24 kHz

Layer III

Layer III

Layer III

48 kHz

48 kHz

32 kHz

JS

DM

DM mono

JS

DM

20 kHz

10.2 kHz

10.2 kHz

20 kHz

20 kHz

15 kHz moderate very good moderate moderate fair good long long long good fair poor

ü

ü

ü

!

note:

CDQ

Prima

U S E R S G U I D E

> 128 kb/s (Layer III not available with internal terminal adapter):

Algorithm Sample rate

Mode Bandwidt h

Delay Cascade

MUSICAM 48 kHz JS 20 kHz low excellent

MUSICAM 48 kHz

Layer III 48 kHz

Layer III 48 kHz

DM

JS

DM

20 kHz

20 kHz

20 kHz low long long excellent good good

Other combinations of algorithm, mode, bit rate and sample rate are possible, but not all combinations are valid. You should be careful when using a remote control device since there is no check on parameter validity when configuring through the remote control port. If you get an error message such as “BAD TOGGLE ON…” or “INVALID

PARAMETERS”, it is because you have entered an invalid combination.

Refer to the

CDQ

Prima Technical Reference Manual for valid bit and

sampling rate combinations.

ü

ü

Please remember that MUSICAM is a fully compatible enhancement to the ISO/MPEG Layer II standard algorithm. Since the ISO standard defines the encoded bit stream, and hence the decoder, all enhancements are to the encoder. Therefore, when connecting to a standard Layer II codec at the far end, the audio you hear will be Layer

II, but the audio heard at the far-end will be MUSICAM enhanced.

MUSICAM encoding makes any Layer II decoder sound better.

Layer III provides the widest bandwidth at low bit rates, up to 15 kHz at bit rates of 56 or 64 kb/s. Layer III may be useful at these low bit rates when wide bandwidths are required and connection costs are a factor. However, even at high bit rates, Layer III has long delay, does not cascade well and is adversely affected by post-processing. There is no advantage to using Layer III over MUSICAM. In some applications,

Layer III may provide better audio than standard Layer II, but in most applications, MUSICAM has been judged to be the superior algorithm.

6.1.2 Pre-Programmed Quick Configurations

Keeping in mind that Speed Dial entries contain all information required to fully configure the encoder and decoder sections, Quick

Configurations are simply Speed Dial entries that do not dial. Since no dialing is performed, you do not need to have an internal terminal adapter to take advantage of Quick Configurations.

!

note:

CDQ

Prima

U S E R S G U I D E

Your Prima LT is shipped pre-programmed with nearly three dozen of the most common configurations pre-loaded as Quick Configurations.

These pre-loaded configurations are held in the first Speed Dial table entries. In some cases we have set the same parameters in two or more entries. We did this to enable you to use the alphanumeric description to configure to various devices without needing to know the details.

The best way to assure trouble-free communication with another

Prima LT or

CDQ

Prima user is to both use the same Quick

Configuration. If both users have loaded the same configuration, and the lines have been dialed correctly (appropriate bit rates), the connection will work. It’s as simple as that. When connecting to a

MUSICAM USA RoadRunner, have the RoadRunner user speed dial the ID number shown in the RoadRunner equivalent column on the following table.

More Quick Configuration can be added at any time. Details on using, editing, and creating your own Quick Configurations can be found later in this chapter. If you do not find a pre-programmed configuration that meets your needs, simply use the one that is closest, changing the parameters that need modifying.

To use a Quick Configuration, simply speed dial the entry by pressing the

SDIAL

button, enter the ID number and press

ENTER

. The following entries have been pre-programmed, Note that 2-Line configurations default to lines 1 and 2:

A pull–out Quick-Configuration table can be found at the end of this chapter. We recommend that this table be kept near the

CDQ

Prima

for quick reference.

CDQ

Prima

U S E R S G U I D E

Zephyr Setup

RR equiv

Decoder Indep

Line format

Samp Rate

Bit Rate

CDQ

Prima

U S E R S G U I D E

RR equiv

Decoder Indep

Line format

Samp Rate

Bit Rate

CDQ

Prima

U S E R S G U I D E

RR equiv

Decoder Indep

Line format

Samp Rate

Bit Rate

Samp Rate

Bit Rate

Use with*

CDQ

Prima

U S E R S G U I D E

Zephyr Setup

RR equiv

Decoder Indep

Line format

CDQ

Prima

U S E R S G U I D E

6.1.3 Manual Encoder Configuration

Common [Encoder] Decoder Maint …

Qstatus Bit rate Algorithm Algo Mode Line Fmt Smpl rate Audio src

More

General Audio In ISO Hdr …

Timing ACE Cal AD Sine Det

(these selections under ‘More’)

(these selections under ‘General’)

MENU NAVIGATION COMMAND WINDOWS RC DESCRIPTION

<Encoder><Audio src> EAI Set encoder audio input source

<Encoder><Algorithm>

<Encoder><Algo mode>

<Encoder><Bit rate>

<Encoder><Line fmt>

EAL

EAM

EBR

ELI

Set encoder algorithm

Set encoder algorithm mode

Set encoder bit rate

Set encoder digital lines format

Set MPEG L2 clip level <Encoder><More><Audio

In><Level In>

<Encoder><Smpl rate>

<Encoder><QStatus>

ELV

ESR

ESS

Set encoder sampling rate

Display encoder status summary

Set encoder timing <Encoder><More><General>

<Timing>

<Encoder><More><Audio

In><Copy/Swap>

<Encoder><More><Audio

In><Mono Mix>

ETI

ECS

EMM

Setup, Audio I/O

Setup, Audio I/O

Set encoder audio channel swap

Set encoder mono mix

6.1.3.1 Encoder Bit Rate

The

CDQ

Prima offers several different combinations of bits and sample

rates. For G.722, Independent Mono modes or with a single-line configuration with an internal terminal adapter, the only allowable bit rates are 56 and 64 kb/s. For 2-line operation, only 112 and 128 kb/s is

CDQ

Prima

U S E R S G U I D E allowed. For MPEG operation in the 1-line mode with a non-TA Digital

Interface, you have a choice of all supported bit rates.

Select the encoder bit rate at the

Bit Rate

prompt or use the EBR command from a terminal.

6.1.3.2 Encoder algorithm

The

CDQ

Prima supports three basic algorithms, all of which are

described in detail in Section 6.1.

G.722 provides 7.5 kHz audio at 56 or 64 kb/s. MUSICAM enhanced

MPEG Layer II supports bit rates from 24 to 384 kb/s, depending on

Digital Interface Module used, and MPEG Layer 3 supports bit rates from 56 to 320 kb/s, also depending on installed Digital Interface module. Please note that CCSO and CCSN algorithms are both enhanced MPEG Layer II algorithms but are used when connecting to older CCS Audio Products codecs such as the CDQ1000 and CDQ2000 codecs that have not been upgraded to work with standard-compliant

MPEG Layer II encoders.

Select the encoder algorithm at the

Algorithm

display prompt

<Common><Encoder><Algorithm> or use the EAL command from a terminal.

6.1.3.3 PKI Compatibility Mode (G.722 Only)

PKI telephones, manufactured by Philips and in wide use in Germany, require a special frame structure, and your

CDQ

Prima must be set

accordingly to interoperate with these telephones. If you are connecting to a PKI telephone, select the

G.722/H.221

mode from the

Common

menu

<Common><G.722/H.221> or use the CGH command from a terminal.

6.1.3.4 Encoder Algorithm Mode

The next step (for MPEG algorithms only) is to select the algorithm mode, Mono, Dual Mono, Stereo, or Joint Stereo. Select the desired mode at the

Algo Mode

prompt or use the EAM command from a terminal.

For G.722, the algorithm mode must be M1. Any other choice is an error.

CDQ

Prima

U S E R S G U I D E

6.1.3.5 Encoder Line Format

Four line formats are available: Single Line (

1 LN

), uses only one of the available lines. Dual Line (

CCS 2 LN

), uses inverse-multiplexing to combine two available lines for 112 or 128 kb/s operation over ISDN or other dedicated lines. H.221 (

H221 6 LN

) uses BONDING to combine up to 6 lines (with internal terminal adapters) to achieve bit rates up to 384 kb/s over ISDN. Independent Mono (

Ind. Mono

) uses two or more available lines to send different audio programs to two or more different locations. The single line mode supports all available bit rates,

Dual Line supports only 112 and 128 kb/s. H.221 supports any multiple of 64 kb/s, up to six. Independent mono supports only 56 and 64 kb/s operation.

Since G.722 supports only 56 or 64 kb/s, if G.722 is selected, the valid choices for line format are Single Line and Independent Mono. Any

MPEG Layer II algorithm supports all four line formats, and MPEG

Layer III supports only Single Line and Dual Line.

Single Line

Dual Line

Encoder Algorithm

G.722

ü

Ind. Mono

send & receive

H.221

MPEG Layer 2 Mpeg Layer 3

ü ü

ü send only

ü

ü receive only

1

Select the encoder line format at the

<Encoder><Line Fmt> display. If you select the

1 LN

,

CCS 2-LN

or

H221 6 LN

line modes, you will then be prompted for the line number(s) to use. If you select

Ind.

Mono

you will be prompted to enter the line number(s) for the left and right channels, and for MPEG Layer II, which channels to use for ancillary data.

From a terminal, use the ELI command to select the line format.

6.1.3.6 Encoder Sample Rate

The next step is to select the encoder sample rate. The choices are 16

(not available with MPEGL Layer 3, only valid choice with G.722), 24,

1

For Layer III independent mono receive, select decoder line format = CCS2LN

CDQ

Prima

U S E R S G U I D E

32 and 48 kHz. Select the desired sample rate at the

Smpl Rate

prompt or use the ESR command from a terminal.

6.1.4 Manual Decoder Configuration

The decoder can be configured manually only if you have selected the decoder independent ‘YES’ mode when configuring the encoder.

Common Encoder [Decoder] Maint …

Qstatus Indep Line Fmt Bit rate AES More

Audio Out Algo Mode … Algorithm … (these selections under ‘More’)

Mute Copy/Swap … (these selections under ‘Audio Out)

MENU NAVIGATION

<Decoder><More><Algorithm>

COMMAND WINDOWS RC

DAL

DESCRIPTION

Set decoder algorithm

<Decoder><Bit rate>

<Decoder><More><Algo

Mode>

<Decoder><Indep>

<Decoder><Line fmt>

<Decoder><More><Audio

Out><Level Out>

<Decoder><More><Audio

Out><Mute>

<Decoder><QStatus>

<Decoder><More><Audio

Out><Copy/Swap>

DLV

DMU

DSS

DCS

DBR

DCO

DIN

DLI

N/A

Set decoder bit rate

Set decoder decoding mode

Set decoder/encoder interaction

Set decoder digital line format

Set decoder output level

Mute decoder output channels

Display decoder status summary

Setup, Audio I/O Set channel copy/swap mode

!

note:

CDQ

Prima

U S E R S G U I D E

6.1.4.1 Decoder Independent Mode

Under normal operation when connecting to any codec manufactured by MUSICAM USA or CCS Audio Products, the decoder should be slaved to the encoder by selecting the ‘Independent NO’ mode. Under certain circumstances, the decoder must be set to operate independently of the encoder:

When connecting to any codec not manufactured by

MUSICAM USA or CCS Audio Products.

• When using any of the Broadcast Modes described in the

Application Notes section of the

CDQ

Prima Technical

Reference Manual.

When using the Independent Mono (Ind. Mono) mode for sending two different monaural programs to two different locations or receiving from two different locations.

When using different algorithms, bit rates or line formats for send and receive audio.

The decoder independent modes also allow send and receive audio to use different algorithms. For example, high quality audio can be sent to another codec, but low-delay, lower quality return audio can be used for cueing. The decoder must be set to independent YES when

connecting to other brands of MPEG Layer II and Layer III compatible codecs.

This standalone (independent) mode can be used at any time; however, there are certain times when the decoder should operate in conjunction with the encoder, as listed above.

Use the DIN command from a terminal or make your selection from the

Indep

prompt

<Decoder><Indep>

If decoder independent

NO

is selected, then the decoder is configured exactly like the encoder, and the configuration is completed. If decoder independent

YES

is selected, you must manually configure the decoder section.

6.1.4.2 Decoder Line Format

The allowable decoder line formats depend on the algorithm selected.

For G.722, the only allowable line formats are Single Line (

1 Ln

) and

CDQ

Prima

U S E R S G U I D E

Independent Mono (

Ind. Mono

). For normal operation with G.722, select

1 Ln

, and for use when connecting to two different far-end encoders, use

Ind. Mono

. If single line is selected, you must enter which line you will be framing (connecting) to. If independent mono is selected, you must enter which lines to use for the left and right channels.

When using any MPEG Layer II algorithm, Single Line (

1 LN

), Dual

Line (

CCS 2 LN

) and H.221 multi-line (

H221 6 LN

) modes are available.

The Single Line mode supports all allowed bit rates only when using a non-terminal adapter type digital interface, otherwise, only 56 and 64 kb/s is supported. The Dual Line mode supports only 112 and 128 kb/s bit rates. H.221 line format allows connecting up to six ISDN lines.

To use BONDING to combine up to six ISDN lines into a larger pipe, select (

H221 6 LN

) and enter the lines to use.

MPEG Layer III supports Single Line and Dual Line modes, with the same restrictions as MPEG Layer II.

Select the line format at the

Line Fmt

prompt

<Decoder><Line Fmt> or use the DLI command from a terminal.

6.1.4.3 Decoder Bit Rate

Under most circumstances, the combination of encoder bit rate, decoder algorithm and line format will determine the allowable decoder bit rate. The decoder bit rate must be a multiple of the base rate chosen for the encoder. For example, if the encoder bit rate is 112 kb/s, the decoder bit rate cannot be 64 or 128 kb/s because different base rates

(56 vs. 64 kb/s) are used.

Select the appropriate bit rate at the

Bit Rate

prompt

<Decoder><Bit Rate> or use the DBR command from a terminal.

6.1.4.4 Decoder Algorithm

The decoder algorithm is selected at the

Algorithm

prompt

<Decoder><More><Algorithm> or using the DAL command from a terminal. The decoder algorithm

can be different from the encoder algorithm only in the decoder independent

YES

mode.

CDQ

Prima

U S E R S G U I D E

6.1.5 Advanced Encoder and Decoder Configuration

At this point, the encoder and decoder sections of the

CDQ

Prima are

completely configured for normal operation. The next section discusses advanced features that set the

CDQ

Prima apart from other

codecs. If you will not be using any advanced encoder or decoder features, you can skip to Section 6.2

The encoder and decoder configurations, either using Quick

Configurations or the manual configuration method, will enable the bidirectional transmission of audio for most applications. The

CDQ

Prima

has many exclusive features that add to the utility and flexibility, and these are discussed here.

6.1.5.1 Encoder Copy/Swap And Mono Mix

MENU NAVIGATION COMMAND WINDOWS RC DESCRIPTION

<Encoder><More><Audio In>

<Copy/Swap>

ECS N/A Set encoder copy or swap mode

<Encoder><More><Audio In>

<Mono Mix>

EMM N/A Set encoder mono mix mode

In dual mono, stereo and joint stereo modes, audio input to the left channel will be encoded as left channel audio, and audio input to the right channel will be encoded as right channel audio. If mono is

selected, under normal operation, only the audio input to the

left

channel is encoded.

The ECS command

<Encoder><More><Audio In><Copy/Swap> allows you to exchange the left and right audio inputs (stereo modes) or use the right input for mono. You can even copy one channel into the other. If you want to use a stereo source for mono transmissions, you can use any one of three different mono-mix settings available using the

EMM

<Encoder><More><Audio In><Mono Mix> command. The mono-mix choices are L+ R (M0), L+ R - 3 dB (M3), or

L+ R - 6 dB (M6) mixing.

F

hint:

CDQ

Prima

U S E R S G U I D E

You can use the Copy/Swap feature to instantly switch between two monaural audio sources. You can even perform this switching remotely using far-end remote control.

6.1.5.2 Decoder Copy/Swap And Mute

MENU NAVIGATION COMMAND WINDOWS RC DESCRIPTION

DCS N/A <Decoder><More><Audio Out>

<Copy/Swap>

<Decoder><More><Audio Out>

<Mute>

DMU

Set decoder copy or swap mode

Set decoder mute

Using this function, you can reverse the left and right channels to compensate for improper wiring, or you can set both channels to output left or right channel audio. Use the DCS command

<Decoder><More><Audio Out><Copy/Swap> to copy or swap channels. Use the DMU command

<Decoder><More><Audio Out><Mute> to mute one or both output channels.

6.1.5.3 Sine Detection

MENU NAVIGATION COMMAND WINDOWS RC DESCRIPTION

<Encoder><More><General>

<Sine Det>

ESD Set encoder sine wave detector

Sine wave detection should be used only when using test tones for audio analysis with test equipment, and should be OFF for normal

operation. Use the ESD command

<Encoder><More><General><Sine Det> to activate or deactivate sine detection.

6.1.5.4 Error Concealment (Layer II Only)

MENU NAVIGATION COMMAND WINDOWS RC DESCRIPTION

<Decoder><More><ACE> DSP Scale decoder scale factor protection

<Encoder><More><General>

<ACE>

ESP Set encoder scale factor protection

!

note:

CDQ

Prima

U S E R S G U I D E

Another MUSICAM USA exclusive feature available on the

CDQ

Prima

is Advanced Concealment of Errors (ACE). ACE is based on CRC

(Cyclic Redundancy Code) protection of the ISO/MPEG Layer II scale factors.

This feature is controlled by the DSP

<Decoder><More><ACE> and ESP

<Encoder><More><General><ACE> commands. In general, it is better to use scale factor protection if the data channel is noisy (high BER). Scale factor protection (ESP) is used for all ISO/MPEG Layer II types of bitstreams. Scale factors are the levels of the digital audio signal within a sub-band. There are 32 subbands and the scale factors change the level over a 120 dB range. An error on any scale factor will cause a perceptible impairment in the audio. To prevent this, scale factor protection can be inserted at the encoder and if the decoder is capable of recognizing it, then the decoder can perform a concealment operation to repair the damaged scale factor. If the decoder does not know about scale factor protection, the audio is decoded and any damaged scale factors cause an impairment.

Scale factor protection is not bi-directional, and must be enabled independently for each direction. If ESP has enabled scale factor

protection, the far end decoder must enable scale factor correction with the DSP command. If only one end has scale factor protection

enabled, audio may be muted. The

CDQ

Prima’s Scale factor protection

is not compatible with other manufacturers codecs. Scale factor protection is compatible with MUSICAM USAs

CDQ

2001 and Prima LT codecs.

6.1.5.5 A/D And D/A Calibration

MENU NAVIGATION COMMAND WINDOWS RC DESCRIPTION

<Decoder><More><Cal DA> DDA N/A Calibrate D/A converter

<Encoder><More><General>

<Cal AD>

EAD Calibrate A/D converter

The decoder Digital to Analog (D/A) converter can be calibrated by the

DDA

command. This calibration process assures that the D/A converter is operating optimally. The analog input A/D converter is calibrated by

CDQ

Prima

U S E R S G U I D E the EAD command. This calibration is performed automatically at power-up but can be manually performed at any time. The calibration process removes the effect of any DC voltage offset present at the input of the A/D converter. This has a minor positive effect on the audio compression algorithm. It may be beneficial to re-calibrate after an audio source has been changed.

6.1.5.6 Encoder Header Bits (Layer II Only)

MENU NAVIGATION COMMAND WINDOWS RC DESCRIPTION

<Decoder><More><Status Bits> DRS

<Encoder><More><ISO Header>

<Copyright>

<Encoder><More><ISO Header>

<Emphasis>

<Encoder><More><ISO Header>

<Original>

<Encoder><More><ISO Header>

<Protection>

ECR

EEP

EOR

EPR

N/A Print real-time decoder status bits

Setup, ISO Header Set encoder copyright bit in header

Setup, ISO Header Set encoder emphasis bit in header

Setup, ISO Header Set encoder original bit in header

Setup, ISO Header Set encoder protection bit in header

<Encoder><More><ISO Header>

<Private>

EPI N/A Set encoder private bit in header

There are 5 bits in the MPEG Layer II that have not been pre-defined and can be used by codec manufacturers for signaling and other purposes.

The encoder header bits set by the ECR, EEP, EOR, EPR and EPI command can be accessed by the decoder using the DRS command.

6.1.6 I/O Level Adjustment (Layer II Only)

MENU NAVIGATION COMMAND WINDOWS RC DESCRIPTION

<Encoder><More><Audio In>

<Level>

ELV N/A Set encoder clip level

<Decoder><More><General>

<Audio Out><Level>

DLV N/A Set decoder output level

In addition to

CDQ

Prima's default +18 dBu clip level, you can adjust the

maximum input or level to +12 or +15 dBu. These adjustable input and

CDQ

Prima

U S E R S G U I D E output levels are useful when connecting your

CDQ

Prima to consumer

grade audio equipment.

When changing the input clip level, the encoder VU meter calibration

(Models 120, 220 and 230) corresponds to the selected input clip level, that is, the ‘0’ dB LED corresponds to the maximum level selected.

Regardless of the decoder clip level selected, the decoder VU meter ‘0’ dB LED always corresponds to +18 dBu.

6.2 Get Connected

Once configured, all that is left is to connect to another user. If you will be receiving the calls, you need to do nothing else. Your

CDQ

Prima is

set from the factory to answer all incoming calls. However, this autoanswer feature can be turned off as discussed in Chapter 5.

6.2.1 Manual Dialing (Internal Terminal Adapter Only)

Once configured, either manually or using quick-configurations, you are now ready to dial into another codec.

Dialing is easy. Press the

DIAL

button. Move the cursor to the line you want to dial, press

ENTER.

Select the bit rate, either 56 or 64, corresponding to the selected encoder bit rate, press

ENTER

and enter the phone number, up to 24 digits/characters, pressing

ENTER

when done. To dial additional lines, follow this procedure, selecting the desired line. To summarize:

For two-line connections:

DIAL

select line

ENTER

select bit rate (must be same base rate as encoder)

ENTER

enter phone number 1

ENTER

DIAL

select line

ENTER

select bit rate (must be same base rate as encoder)

ENTER

enter phone number 2

ENTER

CDQ

Prima

U S E R S G U I D E

For single-line connections:

DIAL

select line to dial

ENTER

select bit rate (must be same base rate as encoder)

ENTER

enter phone number

ENTER

For independent mono or broadcast applications:

DIAL

select line

ENTER

select bit rate (must be same base rate as encoder)

ENTER

enter phone number 1

ENTER

DIAL

select line

ENTER

select bit rate (must be same base rate as encoder)

ENTER

enter phone number 2

ENTER

Continue process until all desired lines are dialed

6.2.1.1 Entering Alphabetic Characters In Phone Numbers

It may be necessary to enter an alphabetic character into a dial string, but under normal circumstances, the alphabetic portion of the keypad is disabled when entering phone numbers. To enable the alphabetic portion of the keypad, use the CKI command

<Common><Speed Dial><Key In Mode>

6.2.2 Speed Dialing (Internal Terminal Adapter Only)

Each of the possible 256 speed dial entries stores all encoder and decoder parameters needed to fully configure the

CDQ

Prima, as well as

up to six ISDN phone numbers for connecting to other codecs. To dial using a stored speed dial entry, simply press the

SDIAL

button, enter the one, two or three digit ID number and press

ENTER

.

You can cancel a Speed-Dial operation at any time by pressing the up arrow button.

CDQ

Prima

U S E R S G U I D E

Speed dial table maintenance is easy, as is creating a new speed dial entry. Later sections of this chapter will discuss table maintenance.

6.2.3 Call Termination

Ending a session is easy. Simply press the

END

button and if you want to hang up all connected lines, just press the

ENTER

button. You also have the option of hanging up only one connected line by selecting the line to hang up before pressing the

ENTER

button.

6.3 Speed-Dial Directory Maintenance

6.3.1 Creating Speed Dial and Quick Configuration Entries

Speed dial and Quick Configuration entries contain all information required to completely configure the

CDQ

Prima’s encoder and decoder for

operation. Speed dial entries differ from Quick Configurations in that they also contain ISDN numbers to dial.

All speed dial and Quick Configuration entries require the following information. The three-letter abbreviations are as shown in the

CDQ

Prima’s LCD display.

Description:

Name of the entry, up to 16 characters, spaces are not allowed in the name.

EBR:

ESR:

Encoder bit rate.

Encoder sampling rate. Note: for G.722, only 16 kHz is valid.

EAL:

EAM:

ELI:

Encoder algorithm.

Encoder algorithm mode. Note: for G.722, only ‘M1’ is valid.

Encoder line format. Note: 2-line formats are only valid with encoder bit rates of 112 and 128 kb/s.

DIN:

Decoder independent operation. Select YES for connecting to other manufacturers codecs, when using different algorithms or bit rates for send/receive audio, independent mono operation or for any broadcast mode

The following 3 parameters are required only if decoder independent

YES has been selected:

DBR:

Decoder bit rate. Can be different, but must be multiple of encoder bit rate.

DAL:

Decoder algorithm.

DLI:

Decoder line format.

CDQ

Prima

U S E R S G U I D E

All speed dial and Quick Configuration entries require the last parameters:

Numb #’s:

Num n:

Number of ISDN numbers or place holders to use. All entries require at least 1 number or place holder.

ISDN number or ‘#’ place holder character.

Although creating a Quick Configuration or speed dial entry may sound difficult or confusing, this is really not the case. The following examples show how easy it is to create table entries.

6.3.2 Example 1 – Save Current Configuration

There may be many instances where a pre-programmed Quick

Configuration may be close to, but not exactly what you need. For example, there is no Quick Configuration for MPEG layer III at 128 kb/s mono, decoder independent. There may also be instances where you have created a custom configuration that you would like to save for future use. Both these scenarios are easy with the

CDQ

Prima’s ability to

save the current configuration. Here’s how:

The closest configuration to 128/48 Layer III, mono, decoder independent, is Quick Configuration 37, 128/48, Layer II, mono, decoder independent. To create the wanted configuration, load Quick

Configuration 37, change the encoder and decoder algorithm to MPEGL

Layer III (MPEGL3), and save.

From the Keypad:

SDIAL 3 7 ENTER

<Encoder><Algorithm><MPEGL3>

<Decoder><More><Algorithm><MPEGL3>

SDSET

<Save Crnt> enter name

ENTER

(load configuration 37)

(MPEG Layer III)

(MPEG Layer III)

(save)

From a terminal or emulator:

CSD 37

return

EAL MPEGL3

return

DAL MPEGL3

return

CSE

name return

(load configuration 36)

(set encoder algorithm)

(set decoder algorithm)

(save)

From the Widows Remote Control program:

Click on the Speed Dial menu, click on Dial ID, and select entry 37.

Click on the encoder icon, change algorithm to MPEGL3.

Open decoder window, change algorithm to MPEGL3

CDQ

Prima

U S E R S G U I D E

Click on Speed Dial, click on New Entry, enter a name, Save.

In all cases, the

CDQ

Prima will return an ID number. This is the ID

number that is used to load the newly created entry.

In this example, a Quick Configuration entry was created since the

CDQ

Prima was not connected to another codec. We could just as easily

have created an actual speed dial entry, which would dial into another codec, if we had dialed into and were connected to the other codec when we saved the current configuration.

6.3.3 Example 2 – Different Send and Receive Algorithms

In this example, we will create an actual speed dial entry that will be used to send high quality, MPEG Layer II stereo audio to a recording studio but receives low quality, low delay G.722 audio from the studio for cueing purposes.

From the Keypad:

SDSET

<Add entry>

ENTER

name ENTER

<128> ENTER

<48> ENTER

<MPEGL2> ENTER

<Joint Stereo> ENTER

<CCS 2 LN> ENTER

1 2 ENTER

<YES> ENTER

<64> ENTER

<G.722> ENTER

<1 LN > ENTER

1 ENTER

<2> ENTER

first number ENTER

second number ENTER enter name encoder bit rate encoder sample rate encoder algorithm encoder algorithm mode

2-line mode line 1 and 2 select decoder independent mode decoder bit rate decoder algorithm decoder line format line 1

2 numbers are dialed

From a terminal or emulator:

CSE name 128 48 MPEGL2 JS CCSL12 YES 64 G.722 L1 number1 number2

CDQ

Prima

U S E R S G U I D E

From the Windows Remote Control program:

Click on Speed Dial then Add Entry.

Enter the information as shown here (use your own name and the correct ISDN numbers) and click on OK.

In all cases, the cdqPrima will return an ID number. This is the ID number that is used to load the newly created entry.

6.3.4 Example 3 – Using Place Holders

The last example will show how to create a speed dial entry for broadcasting stereo audio to three different locations. To illustrate the use of place holders, this example assumes that we will dial the first location on lines 1 and 4, but the second location will call us on lines 2 and 5 and the third location will call us on lines 3 and 6.

Place holders are used when some, but not all lines are dialed. In this example, we will be dialing out on lines 1 and 4, but lines 2, 3, 5 and 6 will be receiving calls. We will need to use place holders on lines 2 and

3 since the cdqPrima will dial all numbers in sequence, starting with

CDQ

Prima

U S E R S G U I D E line 1. We do not need place for lines 5 and 6, since there will be no numbers to dial after the forth line.

From the Keypad:

SDSET

<Add entry>

ENTER

name ENTER

<128> ENTER

<48> ENTER

<MPEGL2> ENTER

<Joint Stereo> ENTER

<CCS 2 LN> ENTER

1 4 ENTER

<YES> ENTER

<128> ENTER

<MPEGL2> ENTER

<2 LN > ENTER

1 4 ENTER

<4> ENTER

first number ENTER

# ENTER

# ENTER

second number ENTER

From a terminal or emulator: entry name encoder bit rate encoder sample rate encoder algorithm encoder algorithm mode

2-line mode line 1 and 4 – this configuration is required for broadcasting to three locations select decoder independent mode decoder bit rate decoder algorithm

2-line mode lines 1 and 4 the number of numbers will be 4 - 2 numbers and 2 place holders line 1 ISDN number line 2 place holder line 3 place holder line 4 ISDN number

CSE name 128 48 MPEGL2 JS CCSL14 YES 128 MPEGL2 CCSL14 number1 # #

number2

CDQ

Prima

U S E R S G U I D E

From the Windows Remote Control program:

Click on Speed Dial then Add Entry.

Enter the information as shown here (use your own name and the correct ISDN numbers) and click on OK.

In all cases, the cdqPrima will return an ID number. This is the ID number that is used to load the newly created entry.

6.3.5 Viewing The Speed Dial Directory

Many times you may not remember the ID number of a Speed Dial or

Quick Configuration entry. You can also view the directory by name and load the entry once it is found.

Viewing the entire Speed Dial directory is easy, press the

SDSET

button and choose the <View Directory> option. Use the left or right arrow buttons to scroll through the directory, remembering that the entries are stored alphabetically by the name of the entry. Once the desired entry

CDQ

Prima

U S E R S G U I D E is found, press the

ENTER

button once to view the contents of the entry, or press the

ENTER

button twice to evoke the entry.

6.3.6 Editing Speed Dial Entries

Editing any speed dial entry, whether a Quick Configuration or an actual dialing entry, is easy. Press the

SDSET

button, select the <Edit

Entry>

option and press

ENTER

. Use the left or right arrow buttons to find the entry you want to change and press

ENTER

.

Now in the edit mode, use the right arrow button to advance to the parameter you want to change. Once at the parameter to change, press the

ENTER

button, change the parameter, then press the

ENTER

button.

Once the parameter has been changed, press the up arrow button to

exit the edit mode.

6.3.7 Example 5 – Changing The Phone Number

Let’s say that your

CDQ

Prima is connected to ISDN through a PBX

system that requires you to dial ‘9’ before making a call. You will need to change the phone number of the pre-programmed Test Line entries in order to connect to them. Editing the current entries is easy. Here’s how:

Press the

SDSET

button, select the <Edit Entry> option, and using the right arrow button, scroll until we see the desired entry to change,

“CCSTEST64”. Note that we used the right arrow button since the entries are stored alphabetically, going right requires fewer button presses.

Press

ENTER

to edit the entry.

Continue pressing the right arrow button to scroll through the settings until the parameter we need to change is displayed. In this case, when the phone number is displayed, press

ENTER

.

Using the alphanumeric keypad, enter the new phone number. Press

ENTER

when done.

• Press the UP ARROW once to exit the ‘edit parameter’ mode, and again to exit the ‘edit entry’ mode. The edited entry is saved using the same ID number.

CDQ

Prima

U S E R S G U I D E

6.3.8 Deleting Speed Dial Entries

You can delete either a single speed dial table entry, or the entire table, depending on the option chosen after pressing the

SDSET

button.

Choosing the <Delete Entry> option allows you to specify the ID number of the entry to delete. Choosing the <Clear All> option erases the entire directory after asking if you are sure.

Remember that once the entries are deleted, they cannot be recovered without factory support.

CDQ

Prima

U S E R S G U I D E

Rev. 6

29

30

31

32

33

34

35

36

37

24

25

26

27

28

19

20

21

22

23

14*

15*

16

17

18

9

10

11*

12*

13*

4

5

6

7

8

2

3

0

1

Entry

6.4 Pre-Programmed Quick Configuration Pull-Out

Description Bit rate

CDQ1000_24K:QS

CDQ20002LNS:QS

H221_2LINES:QS

H221_4LINES:QS

H221_6LINES:QS

MICRO56:QS

G.722_56K:QS

G.722_64K:QS

MPEGL2/64K:QS

MPEGL2/56K:QS

CCSN/64K:QS

CCSTEST64

CCSTEST128

CCSTESTH221

CCSTEST56

CCSTEST112

CDQ1000/56K:QS

CDQ2000/112:QS

CCSN/56K:QS

G.722_H.221:QS

CCSN/128K:QS

CCSN/112K:QS

CDQ2001/128:QS

CDQ2001/112:QS

ZEPHYR/56K:QS

ZEPHYR/64K:QS

ZEPHYR/112K:QS

ZEPHYR/128K:QS

LYR3/56K:QS

LYR3/64K:QS

LYR3IND56:QS

LYR3IND64:QS

LYR3IND56/32:QS

LYR3IND64/32:QS

ROADRUN112:QS 112

ROADRUN128:QS 128

ZEPH112MONO:QS 112

ZEPH128MONO:QS 128

64

56

64

56

64

56

64

112

128

56

64

128

112

128

112

56

112

56

112

56

56

64

64

128

128

384

56

56

64

64

64

128

128

256

Sample rate

48

48

48

32

32

48

48

48

48

48

48

48

48

48

16

48

48

32

32

48

56

24

48

48

48

48

48

48

48

48

16

16

16

48

24

48

48

48

Encoder algorithm

G.722

CCSN

CCSN

MPEGL2

MPEGL2

MPEGL2

MPEGL2

MPEGL2

MPEGL2

MPEGL3

MPEGL3

MPEGL3

MPEGL3

MPEGL3

MPEGL3

MPEGL2

MPEGL2

MPEGL2

MPEGL2

CCSN

MPEGL2

MPEGL2

MPEGL2

MPEGL2

G.722

G.722

G.722

MPEGL2

MPEGL2

CCSN

MPEGL2

MPEGL2

MPEGL2

MPEGL2

MPEGL2

CCSN

MPEGL2

CCSN

Mode Line format

H221L1

CCSL12

CCSL12

CCSL12

CCSL12

L1

L1

CCSL12

CCSL12

L1

L1

L1

L1

L1

L1

CCSL12

CCSL12

CCSL12

CCSL12

L1

CCSL12

H221L12

H221L1234

H221L123456

L1

L1

L1

L1

L1

L1

L1

CCSL12

H221L12

L1

CCSL12

L1

CCSL12

L1

M

M

M

M

M

M

M

M

M

M

M

JS

JS

M

M1

JS

JS

JS

JS

M

JS

M

JS

M

M

M

M

JS

JS

JS

M1

M1

M1

M

M

JS

JS

JS

* — These entries dial numbers, and will not work unless an internal terminal adapter is used and an ISDN line is connected.

BW

(kHz)

15

15

15

15

15

20

20

20

20

8.5

8.5

20

20

15

7.5

20

20

15

15

8.5

20

10.2

20

8.5

8.5

8.5

8.5

20

20

20

7.5

7.5

7.5

8.5

10.2

20

20

20

Decoder independent

NO

YES

YES

YES

YES

NO

NO

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

CDQ

Prima

U S E R S G U I D E

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