Circuit for maintaining compatibility between different image sy

Details Circuit for maintaining compatibility between different image sy Circuit for maintaining compatibility between different image sy

1991-07-30

1993-05-04

Westin, Edward P.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

358138, H04N 578

Patent

active

052087077

ABSTRACT:
Disclosed is a circuit for maintaining compatibility between different image signal recording/reproducing systems. An adaptive de-emphasis unit is attached to the output of the folding frequency information detector of an improved circuit for maintaining compatibility between image signal recording/reproducing systems, in order to restore the signal adaptively emphasized by the adaptive emphasis unit during recording as stated above, to the original signal to prevent degradation in image quality. The adaptive de-emphasis unit comprises a soft switch, a horizontal high-pass filter, a horizontal low-pass filter, a level detector and a lookup table.

REFERENCES:
patent: 4831463 (1989-05-01), Faroudja
patent: 5084767 (1992-01-01), Watanabe et al.
patent: 5161030 (1992-11-01), Song

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