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CDQPrima Application Note #12
Application: Using one codec to send two independent audio programs to two or more locations.
A single CDQPrima can now send two different monaural audio channels to two (or more) locations. It is also possible to receive return audio from any of these locations.
Combined with the broadcasting capabilities of the CDQPrima, Independent Mono can be used to send audio input to the left channel to one (or more) locations while sending audio input to the right channel to other locations. If the head end is any 200 Series CDQPrima, any combination of locations, up to a total of 6 can be supported. Only two locations can be supported with a 100 Series CDQPrima. For example, the English program can be sent simultaneously to New York, London and New Zealand while the French program can be sent to Paris and Quebec. Here's how to do it:
- Set the local CDQPrima's encoder to 56 or 64 kb/s (use the highest bit rate supported by all links), MPEG Layer II, Mono. Select Ind. Mono for the line format.
- When entering the lines to use, remember that CDQPrima broadcasts to all lines. In the example shown in Figure 3-4, Select lines 1 and 3. The English program will be sent on lines 1 and 2, while the French program will be sent on lines 3, 4, 5, and 6. Note that in this example, only lines 1, 2, and 3 are connected.
- Set the decoder to Independent, 56 or 64 kb/s (the same as the encoder), mono, MPEG Layer II. Select Ind. Mono for the line format. To monitor the return audio from New York and Paris, select lines 1 and 3. You can monitor the return audio from London instead of New York by simply changing the decoder lines to 2 and 3.
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