Audio Architecture

This chapter includes information about QNX Sound Architecture (QSA), sounds cards and devices, sound card control devices, mixers, and pulse code modulation (PCM).

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  • QNX Sound Architecture

    In order for an application to produce sound, the system must include the components discussed in this topic.

  • Cards and devices

    The basic piece of hardware needed to produce or capture (i.e. record) sound is an audio chip or sound card, referred to simply as a card. All the sound devices are attached to a card, so in order to reach a device, you must first know what card it's attached to.

  • Control device

    There's one control device for each sound card in the system.

  • Mixer devices

    Mixer devices are responsible for combining or mixing the various analog signals on the sound card.

  • Pulse Code Modulation (PCM) devices

    PCM devices are responsible for converting digital sound sequences to analog waveforms, or analog waveforms to digital sound sequences.