Dual mode coding

Details Dual mode coding Dual mode coding

1982-09-09

1985-01-01

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 31, 381 29, 358135, H03K 1322

Patent

active

044919530

ABSTRACT:
A dual mode encoding/decoding technique for use in digital systems wherein transmitted digital words are limited, on average, to an alotted number of bits. The transmitted digital words are coded into first and second modes. The first coding mode utilizes predictive differential coding to provide a precision which can be greater than that obtainable by coding information solely with the allotted number of bits, while the second mode assures at least a minimum precision for the allotted number of bits. The first coding mode is transmitted as long as a preselected precision is provided. If not, the second coding mode is transmitted. In the disclosed embodiment, the dual mode encoding/decoding technique is applied to the transmission of color video signals.

REFERENCES:
patent: 3403226 (1968-09-01), Wintringham
patent: 3439753 (1969-04-01), Mounts et al.
patent: 4369463 (1983-01-01), Anastassiou et al.
Tescher, Andrew G., Richard V. Cox; "Image Coding: Variable Rate Differential Pulse Code Modulation Through Fixed Rate Channel"; SPIE vol. 119 Application of Digital Image Processing (IOCC 1977).

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