[특허]Data block deinterleaving and error correction system

Data block deinterleaving and error correction system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06F-011/10
출원번호	US-0372585 (1989-06-28)
우선권정보	JP-0160083 (1988-06-28)
발명자 / 주소	Murai Katsumi (Osaka JPX) Kuroki Yuzuru (Sapporo JPX) Satoh Isao (Osaka JPX)
출원인 / 주소	Matsushita Electric Industrial Co., Ltd. (JPX 03)
인용정보	피인용 횟수 : 88 인용 특허 : 0

초록 ▼

A deinterleaving and error correction system which is advantageously utilized in a playback system of an optical recording disk apparatus. As each block of sector data, encoded for example with the Reed-Solomon error correction code with block interleaving, is read from the disk, the positions within the data block at which drop-out of the playback signal occurs are respectively stored in a memory in which the data symbols are also stored, with these drop-out positions being stored as error position data. Error correction processing is executed using the error position data in conjunction with the code words, enabling the maximum number of correctable errors for each sector to be substantially increased using a simple system configuration.

대표청구항 ▼

In an apparatus for recovering data symbols from an input data signal, including means for deriving a recovered clock signal from said input data signal and demodulation means utilizing said recovered clock signal for demodulating said input data signal to obtain said data symbols, a system for deinterleaving and error correction of data symbols of a block of data formed as a plurality of interleaved error correction code words, said block being divided into a plurality of successive frames each comprising an identical number of data symbols, the frames being respectively preceded by fixed-duration resynchronizing signals, the system comprising: resynchronizing detection means responsive to said resynchronizing signals for generating corresponding resynchronizing detection signals; resynchronizing prediction means responsive to each of said resynchronizing detection signals for deriving a time of subsequent occurrence of a predicted resynchronizing signal, based on a number of pulses of said recovered clock signal produced during a frame which succeeds said each resynchronizing detection signal; first comparison means for comparing respective time-axis positions of each of said resynchronizing detection signals and a corresponding predicted resynchronizing signal, and for producing an indication signal if said time-axis positions differ by less than a predetermined amount; memory means; first counter means for counting successive ones of said data symbols to produce, for each of said data symbols, a corresponding symbol count value representing a corresponding one of the code words and a position of said each data symbol within the corresponding code word, and means for writing said each data symbol into said memory means at an address of said memory means that is determined by said symbol count value; means for detecting a signal quality deterioration condition of said input data signal which indicates occurrence of a symbol error and for producing a drop-out pulse in synchronism with each of said data symbols which coincides with said condition; second counter means comprising a set of reversible counters respectively corresponding to said code words, controlled by said symbol count value from said first counter means for counting successive ones of said drop-out pulses to produce respective error symbol count values corresponding to said code words; third counter means comprising a linear feedback counter responsive to successive ones of said data symbols for multiplying a count value held therein by a fixed amount, to obtain count values expressing respective positions within a Galois field index region of said data symbols which coincide with said signal quality deterioration condition, and means for writing into said memory means, in response to each of said drop-out pulses, a corresponding count value from the third counter means as an error position value, said corresponding count value being written into an address of said memory means that is determined by a corresponding one of said error symbol count values; fourth counter means for counting successive ones of said drop-out pulses during each of said frames, beginning from a fixed initial count value at the start of each frame; means for detecting when a count value in said fourth counter means exceeds a predetermined error count value, and producing an output signal in response to said detection; first latch means responsive to said output signal from the count value detection means for producing an output signal which continues until the end of a frame in which said error count value was exceeded; control means responsive to said first latch means output signal for incrementing said second counter means in response to successive ones of said data symbols; second latch means for storing a symbol count value from said first counter means corresponding to a symbol position at which said error count value was exceeded; second comparison means functioning during a frame immediately succeeding said frame in which the error count value was exceeded, for detecting when an error count value of said first counter means coincides with said symbol count value held in said second latch means; control means responsive to said indication signal from said first comparison means, when coincidence is detected by said second comparison means, for decrementing said second counter means in response to successive ones of said data symbols until the end of said immediately succeeding frame; means functioning after a final data symbol of said block has been supplied, for writing final ones of said error symbol count values into predetermined addresses of said memory means; and error correction means, functioning after said final error symbol count values have been written in the memory means, for operating on said data symbols, said error position values and said error symbol count values, to execute error correction processing.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Data block deinterleaving and error correction system 원문보기

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Data block deinterleaving and error correction system 원문보기

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