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Pro Audio Mixer

Pro Audio Mixer Solution from Texas Instruments.

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Digital Audio Receiver Digital Audio Receiver Audio Sample Rate Converter Audio Sample Rate Converter Audio Sample Rate Converter Audio Sample Rate Converter Digital Audio Transmitter Digital Audio Transmitter Audio ADC Audio ADC Audio ADC Audio: Amplifier: Line Driver/Receiver Audio: Amplifier: Line Driver/Receiver Audio DAC Audio DAC Audio DAC Headphone and Tape Recoder Amps Headphone and Tape Recoder Amps Integrated Receive/Transmit and SRC Integrated Receive/Transmit and SRC Microphone Pre-Amp Microphone Pre-Amp Microphone Pre-Amp Microphone Pre-Amp Speaker Amps Clock AC/DC Adapter Low-Noise Analog Power Processor Power System Power Audio DSP Audio DSP

Design Considerations

Digital Pro Audio Mixer

Digital Pro-Audio mixers provide a user the ability to mix and transform audio signals, and are often used in professional recording applications. The system typically consists of a General Purpose Processor, which controls input from the user on a mixer console or 'dashboard',  which sends the information to a Digital Signal Processor (DSP).

Channels desired for mixing are communicated by the DSP to the FPGA, which acts as the traffic controller in the system. Once the signals are digitized (in the case of a microphone or instrument) or normalized (if the signal is coming from another digital system), they are sent to the DSP which performs the audio mixing/processing requested by the user. The mixed audio signals are then sent out to speakers, headphones or other digital devices.

The core subsystems include:

  • Audio Processor
    - Performs digital trim, delay, companding (compression/decompression), mixing and effects on the audio signal received via the McASP port.
     
  • Audio Decoder
    - Digitizes, demodulates, and decodes the analog audio signals to be used by the audio processor.
     
  • Audio Encoder
    - Converts digital component audio signals to the analog domain for output.
     
  • Memory (SDRAM)
    - Used by the DSP as memory for temporary data storage necessary in some mixing functions.
     
  • Receiver
    - Receives and decodes AES/EBU or S/PDIF digital audio data to be sent to the Sample Rate Converter.
     
  • Transmitter
    - Transmits and encodes the DSP's digital DataStream into AES/EBU or S/PDIF format.
     
  • Sample Rate Converter
    - Converts the sample rates from the inputs to a homogeneous sample rate going to the FPGA/DSP and vice-versa.

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