Error compensation by a ramp waveform having a high signal-to-no

Details Error compensation by a ramp waveform having a high signal-to-no Error compensation by a ramp waveform having a high signal-to-no

1986-07-11

1988-07-12

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358166, 358167, 360 331, 360 22, 360 24, 360 31, 360 27, H04N 5782

Patent

active

047573929

ABSTRACT:
A signal processing circuit for a video recording and reproducing apparatus comprises a ramp inserting circuit for inserting a ramp waveform at periodic intervals into a video signal during recording. The ramp waveform varies linearly as a function of time from the minimum to the maximum level of the video signal. On playback, the inserted ramp is periodically detected from a reproduced video signal by a ramp detector. The waveform of the detected ramp is corrected to improve its signal-to-noise ratio by an averaging circuit and applied to a transfer circuit having a transfer function describing the relationship between the original ramp waveform and the corrected ramp waveform. The waveform of the reproduced video signal is transformed according to the transfer function.

REFERENCES:
patent: 4415938 (1983-11-01), Heitmann
patent: 4458271 (1984-07-01), Horstmann
patent: 4459613 (1984-07-01), Faroudja
patent: 4489354 (1984-12-01), Dann

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