Signal restoring apparatus in DVCR using two threshold values
AssigneeLG Electronics Inc.
InventorDong Wha Lee
Life of this patent
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Abstract
A signal restoring apparatus in a DVCR, which generates a bit erasure signal by using two threshold value and uses the same in detection of synchronism so that error detection/correction rate in demodulating signals can be improved. The apparatus detects three of "0," "1" and the bit erasure signal by using two threshold having a value different from each other in the signal detection so that matching rate becomes high by using the detected bit erasure signal. When the bit erasure signal occurs over predetermined number, the matching is not performed and the output of the incorrect synchronism signal is restrained by generating the erasure signal, thereby enhancing error correction capability.
Claims5
An apparatus of restoring a signal of a digital video cassette recorder (DVCR) comprising:
- a signal detecting unit for generating "1,""0" and bit erasure signals by using an input data and two threshold values THa and THb having a different value from each other;
- a synchronism detecting unit for detecting a synchronism signal according to the number of bit erasure signals by searching the number of the bit erasure signal among values output from said signal detecting unit and converting a serial data to parallel data;
- a demodulating unit for generating the erasure signal when the number of the bit erasure signal is over the particular number by mapping parallel output data output from said synchronism detecting unit and simultaneously searching the number of the bit erasure signal;
- and
- a decoding unit for error detecting and correcting by using the erasure signal output from said demodulating unit.
Dependencies are inferred from the claim text.