[특허]Signal processing system having intersymbol-interference cancelling means and method of same

Signal processing system having intersymbol-interference cancelling means and method of same 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G11B-005/00 G11B-005/09
출원번호	US-0103030 (1993-08-06)
우선권정보	JP-0250801 (1992-08-26)
발명자 / 주소	Hara Masaaki (Kanagawa JPX)
출원인 / 주소	Sony Corporation (Tokyo JPX 03)
인용정보	피인용 횟수 : 32 인용 특허 : 0

초록 ▼

A reproduction equalizer including a linear equalizer for linearly equalizing a source signal read from a recording medium, a nonlinear cancellation means for cancelling intersymbol-interference (ISI) contained in the reproduction signal, a decoder for decoding the ISI free signal to reproduce a digital signal prior to storing into the recording medium and means for automatically calculating and/or updating the ISI data held in the nonlinear cancellation means on the basis for the equalized source signal for each address defined by the reproduced digital signal. The nonlinear cancellation means includes a lookup table storing the ISI data, a circuit for generating an address for reading out the ISI data from the lookup table, and a circuit for subtracting the ISI data read out from the lookup table from the equalized source signal. At an initial stage, the calculation means calculates the ISI data, and in a normal operation mode, the calculated ISI data is used.

대표청구항 ▼

A signal processing system, comprising: linear equalization means for linearly equalizing an input continuous source signal and outputting a linearly equalized signal therefrom; nonlinear cancellation means including memory means which stores intersymbol interference among bits of digital data from reproduction of a reference source signal as a predetermined plurality of intersymbol interference data, address producing means comprised of first ternary discrimination means which discriminates by ternary said linearly equalized signal output by said linear equalization means and partial response class IV decoding means which decodes a ternary discriminated signal output by said first ternary discrimination means in accordance with partial response class IV rules to produce an address for reading out intersymbol interference data stored in said memory means, timing adjustment means which delays said linearly equalized signal by a delay time exactly until said address is produced by said address producing means, and subtraction means which subtracts from a delayed linearly equalized signal adjusted in timing by said timing adjustment means intersymbol interference data read out from said memory means using said address produced by said address producing means, for cancelling intersymbol interference in said linearly equalized signal by using said intersymbol interference data at said address of said memory means; decoding means including second ternary discrimination means which discriminates by ternary values data output by said subtraction means and second partial response class IV decoding means which decodes ternary discriminated data output by said second ternary discrimination means in accordance with said partial response class IV rules to produce decoded time series digital data corresponding to said input source signal; means for monitoring fluctuations of said linearly equalized signal; and intersymbol interference data updating means for producing new intersymbol interference data based on a difference between said delayed linearly equalized signal and said ternary discriminated data output by said second ternary discrimination means, and updating intersymbol interference data stored in said memory means at an update address designated by said digital decoded data output by said second partial response class IV decoding means by using said produced new intersymbol interference data.

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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

내보내기 구분	파일저장 인쇄 메일전송
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연합인증

Signal processing system having intersymbol-interference cancelling means and method of same 원문보기

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Signal processing system having intersymbol-interference cancelling means and method of same 원문보기

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