JPS57186216A - Information recording medium reproducer - Google Patents

Information recording medium reproducer

Info

Publication number
JPS57186216A
JPS57186216A JP56070948A JP7094881A JPS57186216A JP S57186216 A JPS57186216 A JP S57186216A JP 56070948 A JP56070948 A JP 56070948A JP 7094881 A JP7094881 A JP 7094881A JP S57186216 A JPS57186216 A JP S57186216A
Authority
JP
Japan
Prior art keywords
circuit
output
limiter
average
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP56070948A
Other languages
Japanese (ja)
Inventor
Isao Masuda
Kazunori Nishikawa
Yoshiki Iwasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Victor Company of Japan Ltd
Nippon Victor KK
Original Assignee
Victor Company of Japan Ltd
Nippon Victor KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Victor Company of Japan Ltd, Nippon Victor KK filed Critical Victor Company of Japan Ltd
Priority to JP56070948A priority Critical patent/JPS57186216A/en
Priority to GB8213031A priority patent/GB2098379A/en
Priority to KR1019820002033A priority patent/KR840000017A/en
Priority to DE19823217482 priority patent/DE3217482A1/en
Priority to FR8208224A priority patent/FR2506053A1/en
Publication of JPS57186216A publication Critical patent/JPS57186216A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K12/00—Producing pulses by distorting or combining sinusoidal waveforms
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/01—Shaping pulses
    • H03K5/08—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding
    • H03K5/082—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding with an adaptive threshold
    • H03K5/086—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding with an adaptive threshold generated by feedback

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Digital Magnetic Recording (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

PURPOSE: To obtain a device correctly reproducing signals uniformly over the entire information recording medium, by providing a circuit which feeds back an average DC voltage of an output of a circuit obtaining a rectangular wave signal and changes a threshold value level for an input terminal of the circuit.
CONSTITUTION: To an input terminal of a circuit obtaining a rectangular wave signal, an average DC voltage of the output of the circuit is fed back and a threshold value level is changed according to the output by a circuit. For example, the continuity and interruption of pits of an audio signals recorded on an audio disc 1 are picked up as a change in a electrostatic capacitance with a reproducing stylus 2, inputted to an equalizer 3 and this signal is formed into a sinusoidal signal and inputted to a limiter 4, outputted as a rectangular wave signal and given to an output terminal as a digital signal via a demodulator 8. From the output of the limiter 4, an average DC voltage of the circuit is obtained via a buffer amplifier 5, an integration circuit 6 and a gain amplifier 7 and this is fed back to an input terminal of the limiter 4.
COPYRIGHT: (C)1982,JPO&Japio
JP56070948A 1981-05-12 1981-05-12 Information recording medium reproducer Pending JPS57186216A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP56070948A JPS57186216A (en) 1981-05-12 1981-05-12 Information recording medium reproducer
GB8213031A GB2098379A (en) 1981-05-12 1982-05-06 Circuit arrangement for a disk player for reproducing information prerecorded in the form of pits
KR1019820002033A KR840000017A (en) 1981-05-12 1982-05-10 Information recording medium playback device
DE19823217482 DE3217482A1 (en) 1981-05-12 1982-05-10 CIRCUIT ARRANGEMENT FOR A TURNTABLE FOR THE REPRODUCTION OF INFORMATION RECORDED IN THE FORM OF GRUEBCHEN
FR8208224A FR2506053A1 (en) 1981-05-12 1982-05-12 DISC PLAYING DEVICE CIRCUIT FOR REPRODUCING PRE-RECORDED INFORMATION IN THE HOLLOW FORM

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56070948A JPS57186216A (en) 1981-05-12 1981-05-12 Information recording medium reproducer

Publications (1)

Publication Number Publication Date
JPS57186216A true JPS57186216A (en) 1982-11-16

Family

ID=13446228

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56070948A Pending JPS57186216A (en) 1981-05-12 1981-05-12 Information recording medium reproducer

Country Status (5)

Country Link
JP (1) JPS57186216A (en)
KR (1) KR840000017A (en)
DE (1) DE3217482A1 (en)
FR (1) FR2506053A1 (en)
GB (1) GB2098379A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS613372A (en) * 1984-06-15 1986-01-09 Fujitsu Ltd Demodulating circuit

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60123766U (en) * 1984-01-31 1985-08-21 パイオニア株式会社 Dropout detection circuit in recorded information reproducing device
JPH04212723A (en) * 1990-07-31 1992-08-04 Toshiba Corp Information recording and reproducing device
SG87796A1 (en) * 1991-05-10 2002-04-16 Discovision Ass Optical data storage and retrieval system including method for processing data on erasable optical disc
US5537379A (en) 1991-05-10 1996-07-16 Discovision Associates Optical data storage and retrieval system and method
US5790495A (en) 1994-05-06 1998-08-04 Discovision Associates Data generator assembly for retrieving stored data by comparing threshold signal with preprocessed signal having DC component
US5894468A (en) * 1994-05-06 1999-04-13 Discovision Associates Data recovery with differentiation and partial integration stages to eliminate noises and DC offset level

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3626209A (en) * 1970-04-06 1971-12-07 Electro Optical Ind Inc Square wave generating circuit
US3909728A (en) * 1973-02-16 1975-09-30 Contraves Ag Apparatus for generating a synchronization voltage for the ignition pulse control of controlled rectifier-power stages
JPS5369006A (en) * 1976-11-30 1978-06-20 Sony Corp Reproducer of disc form signal recording media
US4263555A (en) * 1979-06-15 1981-04-21 Rca Corporation Signal detection system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS613372A (en) * 1984-06-15 1986-01-09 Fujitsu Ltd Demodulating circuit

Also Published As

Publication number Publication date
FR2506053A1 (en) 1982-11-19
GB2098379A (en) 1982-11-17
DE3217482A1 (en) 1982-11-25
KR840000017A (en) 1984-01-30

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