JPS57190478A - Sound noise suppressing circuit - Google Patents

Sound noise suppressing circuit

Info

Publication number
JPS57190478A
JPS57190478A JP56073556A JP7355681A JPS57190478A JP S57190478 A JPS57190478 A JP S57190478A JP 56073556 A JP56073556 A JP 56073556A JP 7355681 A JP7355681 A JP 7355681A JP S57190478 A JPS57190478 A JP S57190478A
Authority
JP
Japan
Prior art keywords
circuit
mode
signal
output
inputted
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
JP56073556A
Other languages
Japanese (ja)
Other versions
JPH0130207B2 (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 JP56073556A priority Critical patent/JPS57190478A/en
Publication of JPS57190478A publication Critical patent/JPS57190478A/en
Publication of JPH0130207B2 publication Critical patent/JPH0130207B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback

Abstract

PURPOSE:To reduce an adjacent disturbance in a sound FM multiplex system sufficiently for its practical use, by prescribing a compression and expansion ratio of amplitude of a sound signal to be recorded, to an optimum value, in accordance with a level ratio of a desired FM sound signal and a disturbance FM sound signal. CONSTITUTION:A sound signal inputted from a terminal 1 passes through a preemphasizing circuit 2, and after that, is inputted to a 2/3 compressing circuit 6 through a switch 3 in case of an SP mode, and on the other hand, is inputted to a 1/2 compressing circuit 4 through a switch 5 in case of an LP mode. Subsequently, an output signal of the circuit 6 or 4 is FM-modulated 9 through a switch 8. Its output is added to an input video signal and is azimuth-recorded on a magnetic tape 12 by a magnetic head 11. Subsequently, a reproduced signal is FM-demodulated 14 through a BPF13, and as for its output, a noise caused by switching the head is processed by prevalue-holding by a holding circuit 16. After that, as for an output signal of the circuit 16, its dynamic range is restored by a 3/2 time expanding circuit 18 and a twice expanding circuit 20, in case of an SP mode and an LP mode, respectively.
JP56073556A 1981-05-18 1981-05-18 Sound noise suppressing circuit Granted JPS57190478A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56073556A JPS57190478A (en) 1981-05-18 1981-05-18 Sound noise suppressing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56073556A JPS57190478A (en) 1981-05-18 1981-05-18 Sound noise suppressing circuit

Related Child Applications (3)

Application Number Title Priority Date Filing Date
JP58195970A Division JPS59131280A (en) 1983-10-21 1983-10-21 Magnetic recording and reproducing device equipped with sound noise suppression circuit
JP12669590A Division JPH0316004A (en) 1990-05-18 1990-05-18 Audio noise suppressor
JP12669490A Division JPH0316003A (en) 1990-05-18 1990-05-18 Audio noise suppressor

Publications (2)

Publication Number Publication Date
JPS57190478A true JPS57190478A (en) 1982-11-24
JPH0130207B2 JPH0130207B2 (en) 1989-06-16

Family

ID=13521632

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56073556A Granted JPS57190478A (en) 1981-05-18 1981-05-18 Sound noise suppressing circuit

Country Status (1)

Country Link
JP (1) JPS57190478A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6046139A (en) * 1983-08-24 1985-03-12 Nippon Telegr & Teleph Corp <Ntt> Compander circuit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5166815A (en) * 1974-12-05 1976-06-09 Matsushita Electric Ind Co Ltd
JPS5265616A (en) * 1975-11-26 1977-05-31 Toshiba Corp Signal recording and reproducing unit
JPS52122035A (en) * 1976-02-18 1977-10-13 Telesonics Inc Stereophonic sound transmitter
JPS5380208A (en) * 1976-12-24 1978-07-15 Matsushita Electric Ind Co Ltd Magnetic recording/reproducing system
JPS53106109A (en) * 1977-02-28 1978-09-14 Sony Corp Vedio signal transmitting circuit
JPS5446404A (en) * 1977-09-20 1979-04-12 Sanyo Electric Co Ltd Noise reduction device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5166815A (en) * 1974-12-05 1976-06-09 Matsushita Electric Ind Co Ltd
JPS5265616A (en) * 1975-11-26 1977-05-31 Toshiba Corp Signal recording and reproducing unit
JPS52122035A (en) * 1976-02-18 1977-10-13 Telesonics Inc Stereophonic sound transmitter
JPS5380208A (en) * 1976-12-24 1978-07-15 Matsushita Electric Ind Co Ltd Magnetic recording/reproducing system
JPS53106109A (en) * 1977-02-28 1978-09-14 Sony Corp Vedio signal transmitting circuit
JPS5446404A (en) * 1977-09-20 1979-04-12 Sanyo Electric Co Ltd Noise reduction device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6046139A (en) * 1983-08-24 1985-03-12 Nippon Telegr & Teleph Corp <Ntt> Compander circuit

Also Published As

Publication number Publication date
JPH0130207B2 (en) 1989-06-16

Similar Documents

Publication Publication Date Title
JPS56144682A (en) Recording and reproducing device for digital video signal and audio signal
JPS57150285A (en) Magnetic recording system of sound signal and recording and reproducing system
JPS57140085A (en) Audio signal recording and reproducing circuit
JPS57118490A (en) Video signal recorder and reproducer
JPS5797281A (en) Magnetic reproducing device for video signal
JPS57190478A (en) Sound noise suppressing circuit
JPS5765076A (en) Television receiver
JPS57190477A (en) Noise suppressing circuit
JPS5377607A (en) Video recorder and reproducer
JPS57138009A (en) Magnetic recorder and reproducer
JPS5621487A (en) Sound multiplex recording system
KR920017070A (en) High Frequency Adaptive De-emphasis and Re-emphasis in Video Signals Using Recorded Control Signals
JPS52146517A (en) Video signal recording reproducing unit
JPS6460165A (en) Recording and reproducing device
JPS5552504A (en) Sound signal recording system
JPS5630375A (en) Video signal recording and reproducting device
JPS5627579A (en) Video signal processor
NO169268C (en) RECEIVER FOR USE IN A Stereophonic FM Broadcasting System that Utilizes DIFFERENCE SIGNAL COMPANDING AND HAS ADAPTIVE EXPANDS
JPS57190487A (en) Signal processing circuit of magnetic recording and reproducing device
JPS56153894A (en) Video signal recorder and reproducer
JPS55100791A (en) Pilot signal recording system
JPS52124314A (en) Magnetic reproducer
JPS52134325A (en) Composite video signal recording and reproduction unit
JPS5217720A (en) Control system of audio-visual recording
JPS5239310A (en) Video recorder