Video and audio data multiplexing into ATM cells with no dummy cell used and ATM cell demultiplexing
First Claim
1. A data multiplexing method of multiplexing an original video signal and an original audio signal into a cell multiplexed video and audio signal, comprising the steps of:
- encoding said original video signal into an encoded video signal;
buffering said encoded video signal as a buffered video datum;
controlling read out of said buffered video datum as video data of a predetermined common data length;
processing said video data into video cells with addition of additional video information to each of said video data;
encoding said original audio signal into an encoded audio signal;
processing said encoded audio signal into audio cells with addition of additional audio information to each of audio data derived from said encoded audio signal to have said common data length; and
multiplexing said video cells and said audio cells into said cell multiplexed video and audio signal;
wherein said buffering step comprises the steps of;
buffering said encoded video signal as said buffered video datum with said video buffering step controlled by said controlling step to produce read out data of said common data length with each of said read out data produced with a delay after said encoded video signal is stored as said buffered video datum;
delay detecting said delay as delay information by comparing said encoded video signal with each of said read out data; and
delay information multiplexing said read out data and said delay information into said video data.
1 Assignment
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Accused Products
Abstract
For cell multiplexing an original video signal and an original audio signal which are encoded into an encoded video signal and an encoded audio signal, a buffer unit buffers the encoded video signal for read out by a control unit as video data of a common data length. The video data and the encoded audio signal are supplied to processors for inserting additional information, such as a header, therein for production of video and audio cells, which are multiplexed by a cell multiplexer into a cell multiplexed video and audio signal. Preferably, the buffer unit comprises a video buffer for buffering the encoded video signal for read out as read video data, a delay detector for detecting a delay needed to produce the read out data, and a delay information multiplexer for multiplexing, on each read out datum for production of the read out data, delay information indicative of the delay. The cell multiplexer uses with a higher priority degree each audio cell concurrently supplied thereto with one of the video cells and uses at least one empty cell while none of the video and the audio cells are supplied thereto. For reproduction of the original video and audio signals, a data demultiplexer device is adapted to the cell multiplexed video and audio signal in which the delay information is multiplexed on each video cell.
62 Citations
17 Claims
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1. A data multiplexing method of multiplexing an original video signal and an original audio signal into a cell multiplexed video and audio signal, comprising the steps of:
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encoding said original video signal into an encoded video signal; buffering said encoded video signal as a buffered video datum; controlling read out of said buffered video datum as video data of a predetermined common data length; processing said video data into video cells with addition of additional video information to each of said video data; encoding said original audio signal into an encoded audio signal; processing said encoded audio signal into audio cells with addition of additional audio information to each of audio data derived from said encoded audio signal to have said common data length; and multiplexing said video cells and said audio cells into said cell multiplexed video and audio signal; wherein said buffering step comprises the steps of; buffering said encoded video signal as said buffered video datum with said video buffering step controlled by said controlling step to produce read out data of said common data length with each of said read out data produced with a delay after said encoded video signal is stored as said buffered video datum; delay detecting said delay as delay information by comparing said encoded video signal with each of said read out data; and delay information multiplexing said read out data and said delay information into said video data. - View Dependent Claims (2, 3, 4)
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5. A data multiplexer device for multiplexing an original video signal and an original audio signal into a cell multiplexed video and audio signal, comprising:
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video encoder means for encoding said original video signal into an encoded video signal; buffer means for buffering said encoded video signal as a buffered video datum; control means for controlling read out of said buffered video datum to produce video data of a predetermined common data length; video processor means for processing said video data into video cells with addition of additional video information to each of said video data; audio encoding means for encoding said original audio signal into an encoded audio signal; audio processor means for processing said encoded audio signal into audio cells by adding additional audio information to each of audio data derived from said encoded audio signal to have said common data length; and multiplexer means for multiplexing said video cells and said audio cells into said cell multiplexed video and audio signal;
wherein said buffer means comprises;video buffer means for buffering said encoded video signal as said buffered video datum, said video buffer means being controlled by said control means to produce read out data of said common data length with each of said read out data produced with a delay after said encoded video signal is stored in said video buffer means as said buffered video datum; delay detector means responsive to said encoded video signal and said read out data for detecting said delay as delay information; and delay information multiplexer means for multiplexing said read out data and said delay information into said video data. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A data demultiplexer device for demultiplexing a cell multiplexed video and audio signal into reproductions of an original video signal and of an original audio signal, said cell multiplexed video and audio signal being produced by time division multiplexing video cell data of a predetermined common data length, propagation delay information representative of a delay used in producing said video cell data and in demultiplexing said video cell data into the reproduction of said original video signal, and audio cell data of said common data length, comprising:
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demultiplexer means for demultiplexing said cell multiplexed video and audio signal into said audio cell data and multiplexed data of said video cell data and said propagation delay information; separator means for separating said multiplexed data into separated video data and separated information; video buffer means for buffering said separated video data as a buffered video datum; video control means for controlling read out of said buffered video datum as read video data in response to said separated information; audio buffer means for buffering said audio cell data as a buffered audio datum of an audio buffer occupancy; audio control means for controlling read out of said buffered audio datum as read audio data in response to said audio buffer occupancy; and decoder means for decoding said read video data and said read audio data into said reproductions. - View Dependent Claims (14, 15, 16, 17)
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Specification