omnia-3fm - Media
OMNIA-3FM
The million dollar sound for under $4,000.
O
i
mn a
A Telos Company
BIG SOUND. SMALL PRICE.
Omnia-3fm: The powerful audio processor that gives you
all the clarity, punch, and loudness that Omnia is known
for, at an amazingly affordable price.
Omnia-3 comes standard with features you might not see
in even the most expensive processors. Like 48kHz sampling, multi-band processing, AES/EBU inputs and outputs,
integrated composite clipper and a removable PC card that
makes it easy to share, store and retrieve favorite settings.
But even more impressive than the features is the Omnia
sound—your station will come alive and jump off the dial!
And by using Omnia-3fm, your station has an unbelievably
loud signature sound without sacrificing clarity.
❚ Fully digital stereo generator with clipper and composite filter for crisp, clean loudness
❚ Both analog and digital inputs (I/O) and dual composite outputs for easy, flexible installation
❚ PDD (Precision Digital Dynamics) clipper of non-aliasing, distortion-controlled design. This is what makes the
Omnia absolutely free from digital grunge
❚ Daypart automation allows settings to be changed
automatically. Dayparts can be programmed to operate
daily, once per week, weekdays or weekends
❚ All-digital FM audio processor delivers the clarity and
precision of digital with the fullness and depth of analog
❚ Unique DSP algorithms provide incredible loudness
without the digital artifacts typically associated with
aliasing products in outdated, less sophisticated DSPbased processors
❚ Easily upgradeable PC Card lets you conveniently store
and share your custom settings and processing presets
❚ Powerful, user-friendly interface with “normal” and
“expert” levels allows precise tailoring of the on-air
sound—a sound that’s uniquely yours—to match your
station’s format and meet the competitive requirements
of your market
The Omnia-3fm sounds better than any other processor,
digital or analog, in this price class.
WHY THE OMNIA-3FM SOUNDS BETTER
Omnia pioneered 48kHz digital sampling for on-air processing.
Our revolutionary audio processors have raised the technical
standards that others are attempting to imitate. And now, the
Omnia-3fm, like the original Omnia, incorporates the most indemand technical features—like a unique PDD (Precision Digital
Dynamics) clipper. This non-aliasing, distortion-controlled
design delivers the performance of a 192kHz-sampled system,
but is actually achieved within a 48kHz architecture. While it
may seem to defy the laws of digital audio, believe us—we’ve
done the math!
Some manufacturers start with a normalized rate of 32kHz and
4x up-sample the system, creating a new rate of 128kHz, and
then perform the hard limiting. The Omnia family’s unique
approach allows a 48kHz sampled system to do exactly the same
work as a system running at 192kHz. By avoiding a brute-force
approach, which requires up-sampling the audio by a factor of
four (and increasing machine cycles by the same factor), DSP
power is conserved.
Operation at 48kHz is far superior to a 128kHz up-sampled
system because the former provides Nyquist protection out to
96kHz (2x the base rate) as compared to the latter, which only
has a Nyquist cutoff of 64kHz (2x the base rate, not the up-sampled rate). Processing performance tests have shown without a
doubt that the 64kHz Nyquist cut-off is far too low, resulting in
the production of digital aliasing artifacts.
The more we field-test the Omnia-3fm and the more feedback
we get from experienced engineers all over the world, one truth
is clear: Today, any processing system that operates at a base
sampling rate of less than 48kHz, even when implementing
hard limiting by up-sampling, is, quite frankly, an antique.
❚ “We’ve looked at other processors but nothing has come even
close to the Omnia in providing the full, rich competitive sound we
use to tantalize our listeners.”
Mike Callaghan, Chief Engineer
KIIS-FM/KXTA-AM, Los Angeles, California USA
❚ “One of the most important steps KTU has ever taken is the
Omnia. Now, our sound has the best of both worlds: clarity and
amazing loudness. And I love to crank it up.”
Frankie Blue, Programming Director
WKTU-FM, New York City, New York USA
❚ “The digital nature of the Omnia means that filters and compression act closely to the ideal, with composite output that has fabulous width and purity.”
Alex Lakey, Chief Engineer
Virgin Radio, London, England
❚ “It’s clear that with Omnia, the best processor on earth, and the
enormous help of the Omnia team, even a leading radio station
can sound better than it already did.”
Rob Korver, Technical Manager
Sky Radio, The Netherlands
❚ “Some formats or program directors may be satisfied with preliminary adjustments and that’s fine. But the Omnia is such a
powerful tool that you can satisfy the toughest program director.”
John Boehm, Chief Engineer
WGCI-AM/FM, Chicago, Illinois USA
CREATIVE, EASY PROCESSING
❚ The LCD screen on the
front panel of the Omnia-3fm
indicates processing activity
on a single screen that shows
L IN
bar graphs for the wideband
AGC and limiter sections.
When the unit is turned on, it
will display audio I/O level indications; a
single turn of the jog wheel accesses the
processing screen.
R IN
❚ Wideband AGC is a flexible wideband leveler
section designed to provide smooth, transparent
control of the input program. A dual reference
gate references the input dynamics to a "rolling
level." A "make-up" gain algorithm allows overall
AGC functions to operate with a slower time
constant, yielding lower intermodulation distortion while retaining loudness in the softer
passages.
❚ Thunder Boost EQ provides up to 12dB bass
boost that shakes the walls! This is a highly
complex bass EQ that considers the time alignment of the low frequencies as they pass through
L OUT
R OUT
0dB
0dB
-15dB
-10dB
-30dB
-20dB
I/O
WIDE
LOW
MID
the entire system, producing a very loud and
clean low end, and never compromising overall
loudness.
❚ Warmth gets vocals and other critical musical
elements in the upper mid, lower presence range
of frequencies more "up front." A range of 6dB
is provided.
❚ Three-band, phase-linear, dynamically flat,
time aligned crossover allows the entire audio
spectrum to be precisely synchronized. This
reduces the chance for phase errors to occur
at the crossover frequencies, resulting in a rich,
more natural sound.
HIGH
PROC
❚ Three-band dynamic peak limiter makes
adjustments based on the "peak weight" of the
signal to determine the degree of dynamic control required. A built-in hold feature allows the
limiter to rest momentarily in order to reduce IM
distortion. The low and mid bands use a feedback configuration for a larger, warmer sound in
the lower frequencies. The high band utilizes the
feedforward design that maintains a more open,
natural texture in the higher frequencies.
❚ A PDD clipper (a non-aliasing, distortioncontrolled design) performs where previous DSP
attempts have failed. The Omnia-3fm generates
no aliasing products. This reduces processing
distortion and produces a clean, loud signal that
clearly surpasses any analog or less sophisticated digital limiter. Furthermore, the Omnia-3fm
doesn’t have to resort to oversampling techniques, which conserves DSP power for use
in other tasks.
❚ Stereo generator (encoder) offers an all-digital
implementation that approaches theoretical perfection. Stereo separation is greater than 65dB
and suppression of the 38kHz carrier is greater
than 75dB. User parameters include separation,
pilot phase, pilot level and composite output
level for seamless integration within your broadcast chain.
❚ Composite clipper with phase-linear composite low-pass filter provides a turbo-charged
signal for additional loudness and doesn’t interfere with the 19kHz pilot. A built-in digital composite filter allows processing to be used without
generating any harmonic content in the SCA
spectrum. You won’t lose loudness because
wasted energy is never transmitted.
Hi
Limiter
WideBand
AGC
Bass
Warmth
XOver
Mid
Limiter
Lo
Limiter
Mixer
Clipper
Composite
Clipper
Stereo
Generator
Left
Output
Right
Output
BUILT-IN COMPOSITE CLIPPING
Omnia is the only family of processors which has
adjustable composite clipping, the preferred technique
used by thousands of broadcasters to achieve clear,
loud audio.
With the fully integrated composite clipper, complete
processor function can be controlled remotely and
included in stored presets. And the unique PDD
(Precision Digital Dynamics) clipper with its non-aliasing,
distortion-controlled design, you get rock-solid peak
control even without composite clipping.
The Omnia-3fm includes a precision digital composite
low-pass filter which eliminates interference to subcarriers (including RDS) from clipping by-products. And the
pilot is added after the clipper—the ideal place.
OMNIA-3FM COMPOSITE
SPECTRUM WITH 2dB OF
COMPOSITE CLIPPING
SPECTRUM OF EXTERNAL
COMPOSITE CLIPPER WITH 2dB
OF COMPOSITE CLIPPING
HERE’S HOW
The test signals were generated by a Delta Electronics SNG-1 (Stereo Noise
Generator); spectrum analysis was performed with a Tektronix TDS-744A
Digital Scope in the FFT mode. The graph at left shows the spectrum out to
100kHz of the Omnia-3fm with its built-in, all-digital composite clipper and
composite low-pass filter. The graph at right shows a different processor
combined with an external composite clipper. Both composite clippers were
set for 2dB of clipping. Notice in the graph at right the significant harmonic
energy in the SCA region as a result of composite clipping.
NO OVERSHOOTS
When the Omnia-3fm is incorporated into transmission
systems sampled at 32kHz, overshoots can result from
sample-rate-conversions and their attendant low-pass
filtering. Until yesterday’s systems catch up to the
Omnia-3fm, the built-in Prediction Analysis Clipper will
predict and eliminate overshoots. The result? All the
benefits of the Omnia-3fm, without the inevitable flaws
of 32kHz sampled systems. Examine the oscilloscope
graphs below and see the results for yourself.
LEFT CHANNEL OUTPUT
OF OMNIA-3FM
SAME SIGNAL
AFTER SAMPLE-RATECONVERSION
HERE’S HOW
Low frequencies and clean high frequencies were used to
provide a good challenge for the control of overshoots.
The analog Left Channel output was connected to a Tektronix
TDS-744A digital storage oscilloscope, which was set to
the infinite persistence mode. Each waveform was stored for
at least one minute so that the display "fills in" with traces
of audio waveforms.
The "flat" lines along the top and bottom of the filled in
section represent clipper performance. Any "dots" that exceed
the reference level of 0.650 volts are overshoots. The center
graph shows "blips" representing overshoots 15 to 20 percent beyond the reference peak level of ±0.650 volts.
The Prediction Analysis
Clipper reduces overshoots in the samplerate-converted signal
path to an insignificant
three percent or less.
LEFT CHANNEL OUTPUT
WITH PREDICTION ANALYSIS CLIPPING
AND SAMPLE-RATECONVERSION
SPECIFICATIONS
❚ AUDIO PERFORMANCE
Frequency Response: ±0.2dB 20Hz - 20kHz (software
limited to 15kHz), de-emphasized, as measured at discrete
left/right analog outputs.
System Distortion*: <0.017% THD, de-emphasized.
Stereo Noise*: >80dB de-emphasized.
Total System Separation*: >65dB, 10Hz - 15kHz.
*These parameters are measured at the recovered
left/right audio output of a Belar FMS-2 stereo decoder.
This figure is a system measurement inclusive of all
processing along with the digital stereo encoder.
Main to Sub Crosstalk: >75dB, measured with a spectrum
analyzer.
Sub to Main Crosstalk: >75dB, measured with a
spectrum analyzer.
❚ COMPOSITE I/O SECTION
SCA/RDS Subcarrier Input
Type: Subcarrier input >53kHz sums into composite
baseband output. Input level control provided via
front panel user interface. High pass filter provided to
suppress subcarrier sub-harmonics from causing
crosstalk into main multiplexed baseband signal.
Composite Outputs
Configuration: Two independent, individually adjusted
outputs. Each output has separate output driver
section. Capable of driving 100 feet of low capacitance
RG-58A/U cable.
Level: 0-10Vp-p, adjustable via front panel user
interface.
Connector: BNC, unbalanced.
Pilot Output
Source: Buffered square-wave reference for RDS
or other 57kHz subcarrier services. Logic level of
0-5V peak-to-peak.
Connector: BNC, unbalanced.
❚ ANALOG & DIGITAL I/O SECTIONS
(All input and output sections are standard equipment.)
Analog Audio Input
Discrete Left/Right Audio Inputs: 10k load
impedance, electronically balanced bridging input,
20-bit analog-to-digital converter.
Maximum Input Level: +24dBu.
Connector: XLR, female, EMI suppressed.
Digital Audio Input
Configuration: Stereo AES/EBU.
Sampling Rate: 32kHz, 44.1kHz, 48kHz,
sample rate converter provided.
Connector: XLR, female, EMI suppressed, balanced
and floating.
Analog Audio Output
Discrete Left/Right: Flat or pre-emphasized, 600
load or greater, electronically balanced, 18-bit digitalto-analog converter.
Connector: XLR, male, EMI suppressed.
Digital Audio Output
Configuration: Stereo AES/EBU.
Sampling Rate: 48kHz
Connector: XLR, male, EMI suppressed, balanced
and floating.
❚ COMPUTER INTERFACE
Configuration: Two methods: RS-232 for basic serial communication via DB-25
connector on the rear panel, or via optional PCMCIA modem card.
Communications: Remote control can be established using a Windows®based program (optional)
❚ REMOTE CLOSURES INTERFACE
Configuration: Eight user-selectable remote tally
functions, set via front panel user interface.
Connector: DB-9, EMI suppressed.
❚ POWER
Configuration: Universal power supply accepts 100-240VAC,
50-60Hz, 45VA.
Connector: IEC, detachable 3-wire power cord, EMI suppressed.
❚ DIMENSIONS AND WEIGHT
19"w x 16.25"d x 3.5"h (48.3 x 41.3 x 8.89 cm) 32 lbs. (14.5kg), net
❚ WARRANTY
Two years, parts and labor, limited.
CUTTING EDGE 2101 SUPERIOR AVENUE
CLEVELAND, OH 44114 USA
TEL: +1 216.241.3343 FAX: +1 216.241.4103
E-MAIL: info@omniaaudio.com www.omniaaudiocom
CUTTING EDGE EUROPE JOHANNISTR.6
D85354 FREISING GERMANY
TEL: +49 8161 42467 FAX: +49 8161 4240
E-MAIL: info@omniaaudio.com www.omniaaudio.com
REVISED: 15 June 2000
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