KR960019081A - Automatic Equalizer of Digital Magnetic Recording and Reproduction System - Google Patents

Automatic Equalizer of Digital Magnetic Recording and Reproduction System Download PDF

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Publication number
KR960019081A
KR960019081A KR1019940028729A KR19940028729A KR960019081A KR 960019081 A KR960019081 A KR 960019081A KR 1019940028729 A KR1019940028729 A KR 1019940028729A KR 19940028729 A KR19940028729 A KR 19940028729A KR 960019081 A KR960019081 A KR 960019081A
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KR
South Korea
Prior art keywords
filter
signal
coefficient
output
pass filter
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KR1019940028729A
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Korean (ko)
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KR0142765B1 (en
Inventor
김규진
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이헌조
엘지전자 주식회사
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Priority to KR1019940028729A priority Critical patent/KR0142765B1/en
Publication of KR960019081A publication Critical patent/KR960019081A/en
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Publication of KR0142765B1 publication Critical patent/KR0142765B1/en

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
    • G11B20/10055—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using partial response filtering when writing the signal to the medium or reading it therefrom
    • G11B20/10175—PR4, PR(1,0,-1), i.e. partial response class 4, polynomial (1+D)(1-D)=(1-D2)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/09—Digital recording

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  • Physics & Mathematics (AREA)
  • Algebra (AREA)
  • Pure & Applied Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Digital Magnetic Recording (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

본 발명은 헤드교환시 계수조정이 필요한 경우 자동적으로 등화기의 계수가 조정되도록 한 디지탈 자기기록 재생시스템의 자동등화장치에 관한 것이다. 종래의 경우 등화기의 계수조정을 마이컴을 구비하는 계수조정부를 이용하여 행함으로써 하드웨어가 복잡하던 점을 감안하여 본 발명은 디지탈 자기기록재생시스템에 있어서, 재생증폭기의 출력중 1/2Tb(Tb:기록신호의 단일 펄스폭)이상의 신호성분을 차단하는 로우패스필터, 계수가 클수록 1/2Tb신호성분이 더 크게 나타나는 특성을 갖는 반사형 트랜스버셜 필터, 상기 반사형 트랜스버셜 필터의 출력에 따라 상기 로우패스필터의 차단주파수 및 상기 반사형 트랜스버셜 필터의 계수값을 자동으로 조정하는 조정부로 디지탈 자기기록재생시스템의 자동등화장치를 구성하여 PR4스펙트럼의 특성을 이용하여 로우패스필터의 차단주파수와 반사형 트랜스버셜 필터의 계수를 자동으로 조정해줌으로써 종래와 같이 마이컴등이 필요치 않아 하드웨어가 간단해질 수 있도록 한 것이다.The present invention relates to an automatic equalizing device of a digital magnetic recording and reproducing system in which the coefficients of the equalizer are automatically adjusted when the coefficient is required for head replacement. In the conventional case, the count adjustment of the equalizer is performed by using a count adjusting unit having a microcomputer, so that the present invention has a complicated hardware. In the digital magnetic recording / playback system, 1 / 2Tb (Tb: A low pass filter for blocking signal components greater than a single pulse width of a recording signal), a reflective hybrid filter having a characteristic in which a 1 / 2Tb signal component is larger as a coefficient is larger, and a row according to an output of the reflective hybrid filter. The automatic equalizer of the digital magnetic recording and reproducing system is configured as an adjusting unit that automatically adjusts the cutoff frequency of the pass filter and the coefficient value of the reflective transverse filter, and uses the characteristics of the PR4 spectrum to cut off the cutoff frequency of the low pass filter By adjusting the coefficient of the transversal filter automatically, the microcomputer is not required as in the prior art, and the hardware is simple. It was made to lose.

Description

디지탈 자기기록재생시스템의 자동등화장치Automatic Equalizer of Digital Magnetic Recording and Reproduction System

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제3도는 본 발명에 따른 디지탈 자기기록재생시스템의 자동등화장치의 구성도,3 is a configuration diagram of an automatic equalizer of the digital magnetic recording and reproducing system according to the present invention;

제4도는 제3도의 반사형 트랜스버셜 필터의 상세 구성도,4 is a detailed configuration diagram of the reflection type transverse filter of FIG.

제5도는 본 발명의 반사형 트랜스버셜 필터의 주파수 특성도.5 is a frequency characteristic diagram of a reflective transverse filter of the present invention.

Claims (3)

디지탈 자기기록재생시스템에 있어서, 재생증폭기의 출력중 1/2Tb(Tb:기록신호의 단일 펄스폭)이상의 신호성분을 차단하는 로우패스필터와, 상기 로우패스필터의 출력이 입력되며 계수가 클수록 1/2Tb신호성분이 더 크게 나타나는 특성을 갖는 반사형 트랜스버셜 필터와, 상기 반사형 트랜스버셜 필터의 출력에 따라 상기 로우패스필터의 차단주파수 및 상기 반사형 트랜스버셜 필터의 계수값을 자동으로 조정하는 조정부로 구성됨을 특징으로 하는 디지탈 자기기록재생시스템의 자동등화장치.In a digital magnetic recording and reproducing system, a low pass filter for blocking signal components equal to or greater than 1 / 2Tb (Tb: single pulse width of a recording signal) among the outputs of a reproduction amplifier, and the output of the low pass filter is input, and the larger the coefficient is 1. A reflection type filter having a characteristic of showing a larger / 2Tb signal component, and automatically adjusting a cutoff frequency of the low pass filter and a coefficient value of the reflection type filter according to an output of the reflection type filter An automatic equalizing device of a digital magnetic recording and reproducing system, characterized in that it comprises an adjusting unit. 제1항에 있어서, 상기 반사형 트랜스버셜 필터는 입력신호의 임피너스 매칭을 위한 가변저항과, 상기 가변저항을 통한 입력신호를 딜레이하는 딜레이부와, 상기 가변저항을 통한 입력신호에 상기 반사형 트랜스버셜 필터의 계수를 곱하는 곱셈기와, 상기 딜레이부의 출력과 곱셈기의 출력을 차동증폭하는 차동증폭기로 구성됨을 특징으로 하는 디지탈 자기기록재생시스템의 자동등화장치.The method of claim 1, wherein the reflective filter is a variable resistor for the impedance matching of the input signal, a delay unit for delaying the input signal through the variable resistor, and the reflective signal to the input signal through the variable resistor And a multiplier for multiplying the coefficients of the transverse filter and a differential amplifier for differentially amplifying the output of the delay unit and the output of the multiplier. 제1항에 있어서, 상기 조정부는 상기 반사형 트랜스버셜 필터의 출력을 각각 서로 다른 주파수대로 필터링하는 복수개의 밴드패스필터와, 헤드 스위칭신호를 딜레이하는 딜레이부와, 상기 밴드패스필터의 출력이 입력되며 상기 딜레이부를 통과한 헤드 스위칭신호의 중심포인트에 동기되어 피크값이 홀딩되는 복수개의 샘플 앤 홀드부와, 상기 복수개의 샘플 앤 홀드부의 출력을 서로 감산하여 에러신호를 검출하여 이 에러신호에 따라 상기 로우패스필터의 차단주파수와 상기 반사형 트랜스버셜 필터의 계수를 자동으로 조정하는 계수조정부로 구성됨을 특징으로 하는 디지탈 자기기록재생시스템의 자동등화장치.2. The apparatus of claim 1, wherein the adjustment unit comprises a plurality of band pass filters for filtering the output of the reflective transverse filter at different frequencies, a delay unit for delaying a head switching signal, and an output of the band pass filter. And subtracting the outputs of the plurality of sample-and-hold portions that are held in peak and synchronized with the center point of the head switching signal passing through the delay portion, and detecting the error signal according to the error signal. And a coefficient adjusting unit for automatically adjusting the cutoff frequency of the low pass filter and the coefficient of the reflective transverse filter. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940028729A 1994-11-03 1994-11-03 Auto-equalizing device of digital magnetic recording and reproducing system KR0142765B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940028729A KR0142765B1 (en) 1994-11-03 1994-11-03 Auto-equalizing device of digital magnetic recording and reproducing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940028729A KR0142765B1 (en) 1994-11-03 1994-11-03 Auto-equalizing device of digital magnetic recording and reproducing system

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KR960019081A true KR960019081A (en) 1996-06-17
KR0142765B1 KR0142765B1 (en) 1998-07-15

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