Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1995-09-25
1998-05-12
Chevalier, Robert
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
386113, H04N 5911, H04N 764
Patent
active
057518947
ABSTRACT:
A recording/reproducing system of a DVCR for detecting an error resulting from a noise or system instability caused by a reproducing process, and correcting the error under correctable conditions converts input digital data into an INRZI signal via a precoder to record the INRZI signal which is restored via a PR4 equalizer and a PR4 detector. The system includes an error detecting/correcting part for detecting occurrence of an error by using a peak waveform and (-) peak waveform from the PR4 detector, an approximate signal of a precoder output detected from an output of the PR4 equalizer, and a peak waveform from the PR4 detector to check whether they correspond to regular rules of a channel modeling process, and correcting the error in case of producing under correctable conditions. Here, a PR4 channel modeling characteristic is utilized to detect the error and correct the error under correctable conditions, so that bit error rate can be decreased to obtain a playback signal relevant to an original input signal. Furthermore, it can be applied to a recording/reproducing system using a magnetic disc channel as well as that using a magnetic tape channel for the purpose of heightening the error correction rate.
REFERENCES:
patent: 5381239 (1995-01-01), Reime
Chevalier Robert
LG Electronics Inc.
White John P.
LandOfFree
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