Automatic peaking circuit

Details Automatic peaking circuit Automatic peaking circuit

1976-08-19

1978-02-21

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 37, H04N 514

Patent

active

040756610

ABSTRACT:
An apparatus is described for automatically restoring the loss of high frequency components in the luminance signal of a television receiver. The luminance signal is continuously sampled and a signal representing the high frequency content in the luminance signal is used to alter the frequency characteristics of the luminance signal path so as to maintain the frequency spectrum of the luminance signal substantially constant. Additionally, the frequency alteration of the luminance signal path is made responsive to the dynamic level of the video signal to provide increased peaking in the gray picture areas relative to the higher level whites. The system also functions to reduce the upper video spectrum noise level.

REFERENCES:
patent: 3535443 (1970-10-01), Rieke
patent: 3604844 (1971-09-01), Ross
patent: 3898379 (1975-08-01), Howe et al.

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