Buffer control for variable bit-rate channel

Details Buffer control for variable bit-rate channel Buffer control for variable bit-rate channel

1991-05-23

1992-10-27

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358135, 358136, 375 26, 375 27, H04N 712, H04N 713

Patent

active

051594471

ABSTRACT:
The problems of buffer overflow and underflow encountered when employing actually variable or effectively variable bit-rate channels for communicating encoded video images are overcome by jointly controlling the number of bits employed to encode each video frame and the transmission bit-rate of the variable bit-rate channel as experience by the encoder. The selection of the number of bits employed to encode each video frame, and hence the encoder bit-rate, as well as the associated channel bit-rate are determined from the encoder buffer fullness, a determination of the decoder buffer fullness and any constraint imposed on the channel. The encoder is responsive to the selected encoder bit-rate and accordingly adjusts its encoding parameters so as to achieve the selected encoder bit-rate.

REFERENCES:
patent: 4706260 (1987-11-01), Fedele et al.
patent: 4706265 (1987-11-01), Furukawa
patent: 4829376 (1989-05-01), Hammer
patent: 4933762 (1990-06-01), Guichard et al.
patent: 5038209 (1991-08-01), Hang
patent: 5073821 (1991-12-01), Juri

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