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      FM Multiplex Decoder

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      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.

      Features


      • 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

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      Specifications


      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

      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 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.

      Environmental

      Continuous operation at ambient temperatures between 32?F/0?C and 122?F/50?C; 0-95% relative humidity, non-condensing, altitudes to 10,000ft/3,048m.

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