Synchronous switching of digital audio while maintaining block a

Details Synchronous switching of digital audio while maintaining block a Synchronous switching of digital audio while maintaining block a

1997-02-05

1999-07-13

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375354, H04K 110

Patent

active

059237104

ABSTRACT:
A system and method for synchronous switching of digital audio data channels while maintaining block alignment between the switched digital audio signals at an output separates status and user bits from audio data and validity bits for each digital audio signal, storing the status and user bits in respective memories for each digital audio data channel. The audio data and validity bits for each digital audio data channel are input via a data first-in, first-out buffer to an audio multiplexer. The status and user bits from the memories for each digital audio data channel are read out by a system clock in synchronization with a system block signal and input to a status/user multiplexer. A selector provides control signals to the multiplexers to select the digital audio data channel to provide to an output transmitter. The status and user bits are combined with the audio data and validity bits in the output transmitter in synchronization with the system block start signal to provide a digital audio signal output that maintains block alignment between the switched digital audio signals at the output.

REFERENCES:
patent: 5134636 (1992-07-01), Barucchi et al.
patent: 5451942 (1995-09-01), Beard et al.
patent: 5592398 (1997-01-01), Terauchi et al.

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