Inovonics, INOmini FM Multiplex Decoder / Demodulates MPX to L,R Audio / AES Out



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FM Multiplex Decoder

Inovonics’ INOmini 514 is a standalone decoder for FM-stereo multiplex signals. It accepts a demodulated FM-baseband input and decodes the signal to discrete left and right channel audio. The recovered stereo program is available as a professional line-level balanced output, and also as an AES digital audio signal.

Local alarm ‘tallies’ and selectable de-emphasis curves make the INOmini 514 an essential tool for professional applications wherever a stereo-baseband signal needs to be decoded and monitored.


  • Decodes 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 program Audio Loss (silence sense) and stereo Pilot Loss (stereo/mono status)
  • Conforms to the worldwide FM ‘pilot-tone’ system; selectable 75μs/50μs de-emphasis


Multiplex (MPX) Input

  • Unbalanced/bridging (BNC); 10k input 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 meter.

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


  • ≤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 provided.

Mounting Options

  • An optional rack adapter accepts up to three INOmini modules in a 1U, 19-inch rack space. Alternatively, the 514 may easily be fastened to any convenient surface with two small screws.

Size and Weight

  • 1.6”H x 5.5”W x 5.5”D; 4 lbs. shipping weight.


Syd: 02 8213 0200  Mel: 03 8691 5210 Qld: 07 3607 3785 WA/SA/NT: 08 8120 3203

New Zealand:
Akl: 09 271 4000 Wel:  04 499 3888

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