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Section I
INTRODUCTION
Product Description
In the FM-stereo broadcasting system, left and right audio
program channels undergo a multiplexing process that cre-
ates a composite, baseband signal. This baseband signal is
composed of a main channel, a subcarrier and a reference
pilot tone, and is broadcast over a station’s FM carrier wave.
The INOmini 514 is a stereo-baseband decoder for profes-
sional applications. It accepts the multiplexed FM baseband
signal and decodes discrete left- and right-channel audio.
Product Features
Features of the Inovonics 514 include:
Conforms to the worldwide FM ‘pilot-tone’ system;
selectable 75µs/50µs de-emphasis.
Decodes the composite/MPX signal into L/R audio.
Analog L/R and AES-digital program line outputs.
Accurate front-panel metering.
Front-panel alarms with rear-panel ‘tallies’ for pro-
gram audio loss (silence sense) and stereo pilot loss
(stereo/mono status).
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Product Specifications
Multiplex (MPX) Input:
Unbalanced/bridging (BNC); 10k in-
put impedance; requires 0.5V p-p minimum signal.
L/R Analog Line Outputs:
Active-balanced (XLR), 200-ohm
source impedance; +4dBu output at ‘0dB’ on front-panel
meter.
AES Digital Output:
Transformer-balanced (XLR), 44.1kHz
sampling rate; –6dBFS output at ‘0dB’ on front-panel me-
ter.
Headphone Jack:
3.5mm (TRS) for low-Z or high-Z phones;
fixed listening level.
Program Audio De-Emphasis:
75µs/50µs, selected with
push-on jumpers under the top cover.
Forced-Mono Operation:
Enabled with a push-on jumper
under the top cover.
Audio Frequency Response:
Follows selected de-emphasis
characteristic ±0.5dB, 20Hz to 15kHz.
Noise
(Unweighted SNR re: ±75kHz deviation)
:
MONO: 72dB; analog/digital
STEREO: 70dB; analog/digital
Distortion:
0.05% THD, 20Hz to 15kHz (analog/digital)
Stereo Separation:
>50dB 20Hz to 15kHz (analog/digital)
Alarm Tallies:
Individual open-collector NPN transistor
outputs for Program Audio Loss (either/both channels)
and Pilot Loss (stereo/mono indicator)
Power Requirement:
12VDC at 230mA. A ‘wall-outlet
transformer’ (WallWart®) switching-type power supply
appropriate to the destination AC mains voltage is pro-
vided.
Mounting Options:
An optional rack adapter accepts up to
three INOmini modules in a 1U, 19-inch rack space. Al-
ternatively the 514 may easily be fastened to any con-
venient surface with two small screws.
Size and Weight:
1.6”H x 5.5”W x 5.5”D; 4 lbs. shipping
weight.
