User manual | Broadcast Audio - PDF Text Files

Broadcast Audio
DH30
Digital Telephone Hybrid
With the variety of phone systems in the world today, it is
becoming increasingly difficult to have all callers sound
the same on-air. To help bring uniformity and high quality
sound to a broadcast talk show environment, we have
created the DH30. The DH30 provides a high quality
interface between a standard telephone line and your
audio equipment.
Designed with both AES/EBU and analog inputs and
outputs, the DH30 can interface with the latest digital and
analog consoles. To ensure quality sound in studios that
have open speakers and microphones, the DH30 was
created with an acoustic echo cancellation feature.
The DH30's digital signal processing (DSP) has multiple adjustable parameters to provide you with the best
send and caller audio signals. New audio processing
features such as the compressor and downward expander
functions ensure that the best audio reaches your
audience. All audio processing features are programmable
via the front panel controls. For the deepest, most reliable
hybrid null, and the best quality caller audio for your
application, the DH30 is the answer.
Easy to use and install, the DH30 has simple front
panel controls and remote control capability. These
controls put the On, Off, Rec, and Cue functions right at
your fingertips. The DH30 also includes a 2W
monitor amp with volume controls right on the front
panel. The Rec function sends a start/stop signal to your
external recording device. The Cue function allows you to
control which audio signal should be sent to the caller,
allowing you to switch from the Send input to the Cue
input at the touch of a button.
The DH30 features acoustic echo cancellation to
ensure quality sound in studios with open mics.
Features and Benefits
• Remote controllable presets
• Password protected
• 24-bit digital signal processing (DSP)
• AES/EBU digital or analog audio input and output
• Record and Cue functions
• Selectable auto mix-minus
• Selectable acoustic echo cancellation
• Selectable auto answer and disconnect
• Integrated monitor amp with front-panel volume
control
• Remote control via contact closures or RS-232
• Adjustable caller control (ducking)
• Adjustable three-band equalizer
• Adjustable compressor and expander
• Bass boost
• Microphone send and cue preamps
• Automatically accepts all worldwide voltages
• Three selectable presets for customized audio
• Worldwide compliant including FCC, CSA, CE, CTR 21
broadcast audio
Specifications
Dimensions (LxDxH)
17.125" x 10.125” x 1.75”
43.5 x 25.7 x 4.44 cm
Rack mount included for installation in a
19” rack
Weight
6.7 lb/3.04 kg (dry)
11.2 lb /5.08 kg (shipping)
Operating Temperature
32-100° F/0-38° C
Humidity
0-80%
Front Panel Controls
LCD programming display, ENTER/ESC/▲▼
programming buttons, monitor volume control, send-level LED bar meter, caller-level
LED bar meter, record, cue, hybrid
On/Off, buttons with status LEDs
Power: IEC Type
Auto adjusting, 100-240VAC, 2A, 50/60Hz,
30W
AES/EBU IN: XLR
Pin 1=ground, pin 2=+phase,
pin 3=-phase; 32, 44.1, or 48kHz sample
rate
AES/EBU OUT: XLR
Pin 1=ground, pin 2=+phase,
pin 3=-phase; 32, 44.1, or 48kHz sample
rate
RS-232: DB9 female connector
9,600 baud rate, used for status and
control via a PC or other RS-232
controller
Record Control: DB9 female
Start, stop, and enable outputs are open
collector outputs rated at 40VDC and
50mA maximum
Remote: DB25 female
Remote Send input: 0dBu nominal,
adjustable, unbalanced, 20kΩ impedance
Remote Caller and Aux outputs:
Telco Line: RJ11 connector
POTS (plain old telephone service) line
or analog extension from a PBX or dry
line (no DC offset voltage)
A-Lead supervision provided
0dBu nominal, adjustable, unbalanced,
50Ω impedance
Control inputs: Remotely activate any of the
following functions with a simple switch
closure to ground: On, Off, Cue, and Rec
along with preset selection controls
1,2, and 3 or with Send, Caller, and
Monitor Mute controls
Status Outputs: Remotely check the status of
the hybrid with the On, Off, Cue, Rec,
Send Presence, and Caller Presence
status outputs. All status outputs are
open collector outputs rated at 40VDC
and 50mA maximum
Monitor Output: 1/4” stereo jack
Tip=+phase, ring=-phase sleeve=-phase;
2W output into an 8Ω load
Telco Set: RJ11 connector
A-Lead supervision provided
Telephone Transmit
All measurements referenced at –15dBm level
on the phone line
Frequency response: 250Hz to 3.5kHz, ±1dB
SNR: >70dB
Distortion: <0.15%
Telephone Receive
All measurements referenced at -15dBm level
on the phone line with caller processing
options bypassed
Frequency response: 250Hz to 3.5kHz, ±1dB
SNR: >70dB
Distortion: <0.1%
Send Input: XLR female
Mic/Line selectable, -55 or 0dBu
nominal, adjustable, balanced bridging,
20kΩ impedance, selectable 12VDC
phantom power
Echo Cancellation/Mix-Minus
Tail time: 120 milliseconds
Null: 50dB
Cue In: XLR female
Mic/Line selectable, -55 or 0dBu
nominal, adjustable, balanced bridging,
20kΩ impedance, selectable 12VDC
phantom power
Telco Cancellation
Tail time: 32 milliseconds
Null: 55dB
Caller Output: XLR male
0dBu nominal, adjustable, balanced
50Ω impedance
Aux Output: XLR male
0dBu nominal, adjustable, balanced
50Ω impedance
Telephone
Line
Ty p i c a l D H 3 0 D i g i t a l C o n s o l e I n s t a l l a t i o n
Console In
Console Out
VOLTAGE RANGE 100V-210V
FREQUENCY 50Hz/80Hz
AES/EBU IN
SEND IN
AES/EBU OUT
MONITOR
RS-232
RECORD CONTROL
REMOTE
Record
Control
Gentner Corporation ~ 1825 Research Way, Salt Lake City, UT 84119 ~ 1-800-945-7730 ~ www.gentner.com
© 2001 Gentner Communications Corporation. All rights reserved. Other product names may be trademarks of their respective owners.
Information in this document subject to change without notice. 802-012-301 Revision 1.2
CUE IN
CALLER OUT
AUX OUT
TELCO
LINE SET
Telephone
(Optional)

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