Method and apparatus for preventing overflow and underflow of an

Details Method and apparatus for preventing overflow and underflow of an Method and apparatus for preventing overflow and underflow of an

1995-02-23

1997-04-08

Razavi, Michael T.

Facsimile and static presentation processing

Facsimile

Facsimile memory monitoring

348419, H04N 100

Patent

active

056193416

ABSTRACT:
The present invention is method and apparatus for preventing overflow and underflow of an encoder buffer in a video compression system. A virtual buffer is created in a rate controller to model the decoder buffer fullness (102). A sequence of bits is generated by an encoder (104). The encoder is controlled by the rate controller to prevent a decoder buffer underflow and overflow. Then, the sequence of bits is received by the encoder buffer to produce a bitstream (106). The bitstream corresponds to an instantaneous channel bitrate. The bitstream is transmitted from the encoder buffer to a decoder buffer following a delay (108). The delay is controlled by a rate controller to synchronize an encoder buffer fullness with a virtual buffer fullness (110). The synchronization prevents overflow and underflow of the encoder buffer.

REFERENCES:
patent: 4907081 (1990-03-01), Okamura et al.
patent: 5159447 (1992-10-01), Haskell et al.
patent: 5216503 (1993-06-01), Paik et al.
patent: 5241383 (1993-08-01), Chen et al.

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