• Overview
  • Specifications


Key Workflow: Stereo sound card with on-board processing for voice-over recording

PCX924HR-Mic is a PCI stereo sound card with on-board processing  designed for use in professional PC-based audio systems designed by Digigram Development Partners. Thanks to its  outstanding audio quality, reliability, and stability, PCX924HR-Mic is the perfect choice for applications such as voice-over recording for journalists.

At a glance

PCX924HR-Mic is the stereo model of the PCX series of sound cards that features a microphone input. Thanks to its broadcast grade specifications, its on-board processing and unrivaled reliability, PCX924HR-Mic is the references stereo sound card used in the voice-over  applications for journalists designed by Digigram Development Partners. The proprietary Software Development Kit (SDK) allows control of the card’s on-board features. Available as part of the systems delivered by our Development Partners, PCX924HR-Mic can also be used as a linear PCM sound card with software applications based on standard driver interfaces.

  • PCI stereo sound card designed for the broadcast industry
  • On-board processing available through Proprietary Digigram SDK: MPEG audio, mixing of PCM and MPEG, cross-fades, real time time-scaling
  • High audio quality stereo sound card that supports balanced analog and AES/EBU audio
  • Microphone level input for dynamic or condenser microphone, with on-board analog expander/compressor/limiter, mixed with each line level input
  • The card is also compatible with most of the third party software applications for audio production, under Windows and Linux
  • PCX cards are sold to Development Partners: they design and sell the applications that include these cards

Key features

  • PCI  stereo sound card with on-board processing: MPEG audio, mixing of PCM and MPEG, cross-fades, real time time-scaling, 3-band parametric EQ, Maximizer
  • Two balanced analog inputs and outputs, +24 dBu max level
  • One balanced microphone input mixed with each line input (up to +66dB analog gain), with  switchable 48V phantom power and adjustable analog expander/compressor/limiter
  • One AES/EBU input with hardware sample rate converter, AES42 compatible (digital microphone), and one AES/EBU output
  • Adjustable input and output analog and digital gains
  • AES11 sync input
  • On-board 3-band parametric EQ and Maximizer effects
  • Two GPI (dry contact) and two GPO (relays)
  • Support for Windows 32-bit and 64-bit (Digigram proprietary SDK, WDM kernel streaming, DirectSound, Wasapi, ASIO)
  • Breakout cables with XLR connectors for audio connectivity


  • Bus/Format: PCI 2.2, “Universal PCI 32-bit/66 MHz” master mode, “short-length” PCI format compatible, PCI-X compatible
  • Size: 175 mm x 99 mm x 20 mm
  • Power requirements (+3.3V/+5V / +12V / –12V): 0.35 A / 0.2 A / 0.2 A / 0.08 A
  • Operating: temp / humidity (non-condensing):0°C / +50°C • 5% / 90%
  • Storage: temp / humidity (non-condensing): -5°C / +70°C • 0% / 95%


  • Programmable input gain:AES/EBU Sync (up to 200 kHz), 2 GPI (dry contact), LTC
  • AES11 synchronization


  • Analog line outputs (mono): 2 servo-balanced
  • Maximum output level / impedance: +24 dBu / < 100 kOhms
  • Digital outputs (stereo): 1 AES/EBU, up to 200 kHz
  • Programmable output gain:
    analog: from –24 dB to +24 dB
    – digital: from –110 dB to +18 dB
  • Other outputs:1 stereo headphone output (600 W) 2 GPO (relay, 0.5 A, 48 VCC)


  • Internal connector: inter-board synchronization
  • External connectors:
    – 15-pin Sub-D for analog I/Os
    15-pin HD Sub-D for digital I/Os, Sync., and GPIO
    1 mini jack headphone stereo output (3.5 mm TRS female jack)

Audio specifications

  • Sampling frequencies available: Programmable from 8 to 192 kHz
  • A/D and D/A converter resolution: 24 bits
  • Supported audio formats: PCM (8, 16, 24 bits), Float IEEE754, MPEG (Layer I, II, and III up to 48 kHz)

Analog audio performance

  • Frequency response (record + play):
    – at 48 kHz: 20 Hz – 20 kHz: +0 /-0.3 dB
    – at 96 kHz: 20 Hz – 40 kHz: +0 /-0.4 dB
    – at 192 kHz: 20 Hz – 80 kHz: +0 /-1.1 dB
  • Channel phase difference: 20/20kHz: <0.2°/2°
  • Dynamic range (A-weighted):
    – analog In: >104 dB
    – analog out: > 106 dB
  • THD + noise 1 kHz at -2 dBfs:
    – analog In: >-97 dB
    – analog out: <-95 dB
  • Crosstalk (Analog in or out):
    – 1 kHz at 24 dBu: <–115 dB
    – 15 kHz at 24 dBu: <-100 dB

Sample rate converter performance

  • Maximum frequency: 192 kHz
  • Frequency ratio: from 1:8 to 7,5:1
  • THD + noise 1 kHz at –2 dBfs: <-130 dB

development environments

  • Maximum frequency: 192 kH
  • Digigram management under Windows: np SDK
  • Other management under Windows:  Wave (PCM & MPEG Laye II), WASAPI, ASIO, and DirectSound (all PCM)
  • OS supported: from Windows 7 and Windows server 2003 (32-bit and 64-bit versions)
  • Main on-board processing features (with np SDK): PCM play & rec, MPEG Layers I & II play & rec, Layer III play, Float IEEE754,direct monitoring, real-time mixing, level adjustment, panning, cross-fade, punch-in/punch-out, scrubbing, time-stretching, pitch-shifting, 3-band parametric equalizer, maximizer, format and frequency conversions


  • Low OPEX: due to low failure rate and driver reliability
  • Increased system efficiency: guarantee of low latency operations and of processing power availability
  • Ongoing product support: from Digigram and its Development Partners
  • Low TCO and future-proofed