Receiving device in an asynchronous video information transmitti

Details Receiving device in an asynchronous video information transmitti Receiving device in an asynchronous video information transmitti

1984-10-19

1987-04-21

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 12, 358135, 358142, 358147, 358260, 358281, 340347DD, 375 25, 375 30, 375 31, 370 91, H04N 704, H04N 708, H04N 7093

Patent

active

046600795

ABSTRACT:
This invention relates to digital transmission techniques whereby information produced in asynchronous form, for instance by variable-length coding and/or by conditional coding, is intended for transmission through a synchronous digital transmission path. More particularly, the invention concerns a receiving device comprising a picture buffer memory having a content that can be different from that of a picture buffer memory included in a transmitting device of the system, a circuit for detecting picture line and field synchronizations, a circuit for transcoding video information prior to its writing in the receiving device buffer memory and a circuit for monitoring writing and reading addresses in the buffer memory in terms of the detected synchronizations. A partial decoding of the video information is performed prior to entry in the receiving device buffer memory, and a synchronization of this memory is independent of the content in the transmitting device buffer memory.

REFERENCES:
patent: 3971888 (1976-07-01), Ching et al.
patent: 4049910 (1977-09-01), Jolivet et al.
patent: 4420771 (1983-12-01), Pirsch
patent: 4509038 (1985-04-01), Hirano
patent: 4568916 (1986-02-01), Bahgat
"Characteristics of Primary PCM Multiplex Equipment Operating at 2048 kbit/s", International Telegraph and Telephone Consultive Committee (CCITT) Recomendation G. 732, 1972, pp. 86-92.
"A Codec for Videoconferencing Using 2048 kbit/s Transmission", International Telegraph and Telephone Consultive Committee (CCITT), Contribution No. 134, Aug. 1982, pp. 1-12 with Addendums 1 and 2 of Oct. 1982.

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