Data compander for digital video signals

Details Data compander for digital video signals Data compander for digital video signals

1988-02-24

1989-06-20

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 21R, H04N 944

Patent

active

048413577

ABSTRACT:
A data compander for digital video signals wherein the sampling frequency is locked to the chrominance-subcarrier frequency. The data compander includes the following cascaded subcircuits: a lock-mode-changing filter which changes the lock of the video signals with the chrominance subcarrier into signals whose clock frequency is locked to the line frequency; an (a/b)-decimation filter, where a, b are integers, and a is less than b; a first peaking filter; a utilization circuit for the line-locked signals; a (b/a)-interpolation filter; a lock-mode-reversing filter which changes the lock of the signals with the line frequency; and a second peaking filter.

REFERENCES:
patent: 4612568 (1986-09-01), den Hollander et al.
patent: 4700217 (1987-10-01), Balaban et al.
Fernseh & Kino Technik, Band 40, No. 4, Apr. 1986, pp. 141-146, Heidelberg, DE, by T. Nillesen: "Digitaler TV-Farbdecoder mit Zeilenfrequenzverkopplung".

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