Method and system for multiplexing audio and video signals to di

Details Method and system for multiplexing audio and video signals to di Method and system for multiplexing audio and video signals to di

1990-08-28

1992-09-22

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, H04N 708

Patent

active

051502119

ABSTRACT:
An audio signal is multiplexed into a video picture signal by converting the audio signal into a sequence of digital code words from which subwords are extracted relative to a video signal line frequency. The number of bits in each subword is determined as a function of the amplitude dynamic range of the video signal, and each extracted digital subword is converted to provide analog samples with amplitudes proportional to quantizing of the corresponding digital subword. These analog samples are used to amplitude modulate an active portion of the video signal corresponding to a picture so as to provide a "composite" signal having the format of the video signal.

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