Multiplex/Demultiplex (MUX/DEMUX) Standard for Multiple Data Channel Recording on 19-MM Digital Cassette Helical Scan Recorder/Reproducer Systems

6.14 Multiplex/Demultiplex (MUX/DEMUX) Standard for Multiple Data Channel Recording on 19-MM Digital Cassette Helical Scan Recorder/Reproducer Systems

For recording and reproducing multiple channels on 19-mm Digital Cassette Helical Scan Recorders, the ADARIO multiplex/demultiplex format is recommended. The ADARIO (Analog/Digital/ Adaptable/Recorder Input/Output) format was developed for the Department of Defense, Fort Meade, Maryland. The format is government-owned and may, therefore, be used in equipment provided for government activities. Following are some of the ADARIO features:

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  requires less than 3 percent overhead to be added to user data;
  
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  accommodates multiple channel record/playback with each channel completely autonomous in sample rate and sample width;
  
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  stores all the necessary parameters for channel data reconstruction for either real-time playback, time-scaled playback, or computer processing;
  
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  preserves phase coherence between data channels;
  
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  provides channel source and timing information; and
  
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  accommodates 2²⁴ (over 16 million) blocks of data, each block having 2048 24-bit words (see Figure 6-7).
  

The ADARIO format imposes minimum restrictions on the channel signals and aggregate data parameters. Specific implementations that use the ADARIO format may impose additional restrictions.

Figure 6-7. ADARIO block format.