JPS5745786A - Voice signal noise eliminating circuit for magnetic record reproducing device - Google Patents

Voice signal noise eliminating circuit for magnetic record reproducing device

Info

Publication number
JPS5745786A
JPS5745786A JP55121051A JP12105180A JPS5745786A JP S5745786 A JPS5745786 A JP S5745786A JP 55121051 A JP55121051 A JP 55121051A JP 12105180 A JP12105180 A JP 12105180A JP S5745786 A JPS5745786 A JP S5745786A
Authority
JP
Japan
Prior art keywords
circuit
reproducing
inputted
output
time
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.)
Granted
Application number
JP55121051A
Other languages
Japanese (ja)
Other versions
JPH0133991B2 (en
Inventor
Shigeyuki Ito
Yoshizumi Wataya
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP55121051A priority Critical patent/JPS5745786A/en
Priority to CA000381532A priority patent/CA1157939A/en
Priority to AT81303210T priority patent/ATE18616T1/en
Priority to EP81303210A priority patent/EP0044687B1/en
Priority to DE8181303210T priority patent/DE3174052D1/en
Priority to US06/283,186 priority patent/US4843488A/en
Publication of JPS5745786A publication Critical patent/JPS5745786A/en
Publication of JPH0133991B2 publication Critical patent/JPH0133991B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/12—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams
    • G11B15/14—Masking or switching periodically, e.g. of rotating heads
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/911—Television signal processing therefor for the suppression of noise

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE:To eliminate noise at the time of track changeover without deterioration of reproduced picture and sound quality by using output signal of AFC circuit of fixed phase for reproducing horizontal synchronizing signal and controlling so that the time of reproducing track changeover coincides with zero cross point of periodical noise. CONSTITUTION:Reproducing signals taken out by a reproducing head 2 or 3 are inputted to a changeover switch circuit 6, changed by the circuit 6 and demodulated by an FM demodulator 9 and held in a preholding circuit 11. Reproducing horizontal synchronizing signals 19 are inputted to a phase comparator 21 of a noise eliminating circuit. An AFC circuit is constituted of the comparator 21, a loop filter 22 and a VCO23. Output signals of this AFC circuit are inputted to a monostable multivibrator 15 as trigger signals. Output of the multivibrator 15 is inputted to a D-type FF17 which inputs a reproducing track changeover signal. The output of the FF17 controls the circuit 6, and at the same time, controls the circuit 11 through a holding signal generating circuit 25. Thus, malfunctions due to drop out etc. near the time of reproducing track changeover are prevented.
JP55121051A 1980-07-14 1980-09-03 Voice signal noise eliminating circuit for magnetic record reproducing device Granted JPS5745786A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP55121051A JPS5745786A (en) 1980-09-03 1980-09-03 Voice signal noise eliminating circuit for magnetic record reproducing device
CA000381532A CA1157939A (en) 1980-07-14 1981-07-10 Noise elimination circuit in a magnetic recording and reproducing apparatus
AT81303210T ATE18616T1 (en) 1980-07-14 1981-07-13 CIRCUIT FOR ELIMINATING NOISE IN A MAGNETIC RECORDING AND PLAYBACK DEVICE.
EP81303210A EP0044687B1 (en) 1980-07-14 1981-07-13 Noise elimination circuit in a magnetic recording and reproducing apparatus
DE8181303210T DE3174052D1 (en) 1980-07-14 1981-07-13 Noise elimination circuit in a magnetic recording and reproducing apparatus
US06/283,186 US4843488A (en) 1980-07-14 1981-07-14 Noise elimination circuit for reproduction of audio signals in a magnetic tape recording and reproducing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55121051A JPS5745786A (en) 1980-09-03 1980-09-03 Voice signal noise eliminating circuit for magnetic record reproducing device

Publications (2)

Publication Number Publication Date
JPS5745786A true JPS5745786A (en) 1982-03-15
JPH0133991B2 JPH0133991B2 (en) 1989-07-17

Family

ID=14801610

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55121051A Granted JPS5745786A (en) 1980-07-14 1980-09-03 Voice signal noise eliminating circuit for magnetic record reproducing device

Country Status (1)

Country Link
JP (1) JPS5745786A (en)

Also Published As

Publication number Publication date
JPH0133991B2 (en) 1989-07-17

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