JPS5513577A - Noise reduction system - Google Patents

Noise reduction system

Info

Publication number
JPS5513577A
JPS5513577A JP8644378A JP8644378A JPS5513577A JP S5513577 A JPS5513577 A JP S5513577A JP 8644378 A JP8644378 A JP 8644378A JP 8644378 A JP8644378 A JP 8644378A JP S5513577 A JPS5513577 A JP S5513577A
Authority
JP
Japan
Prior art keywords
oscillator
level
output
detector
change
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
JP8644378A
Other languages
Japanese (ja)
Other versions
JPS6013621B2 (en
Inventor
Yuzo Fuse
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP8644378A priority Critical patent/JPS6013621B2/en
Publication of JPS5513577A publication Critical patent/JPS5513577A/en
Publication of JPS6013621B2 publication Critical patent/JPS6013621B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE: To eliminate the fluctuation of a background noise and the lowering of a tone quality generated at the level change time of signals by changing the emphasis quantity of a compressor and an expander according to the proportion of the level change or the level differentiated value simultaneously with the level change of input signals.
CONSTITUTION: Between adder 3 and voltage control oscillator 4 connected to input terminal 2, capacitor 21 and resistance 22 are connected in parallel, and resistance 23 is connected to oscillator 22, and the output voltage of oscillator 4 is controlled by the output of level detector 6, and a level compression with pre-emphasis is performed by these parallel curcuits and oscillator 4. Next, capacitor 24 which emphasizes high-band components is connected and resistance 25 is connected in parallel with oscillator 28 between terminal 2 and voltage control oscillator 8, and the output of oscillator 8 is controlled by the output of change components detector 7 which detects detection level change components, and the noise at a compression time is reduced, thus recording signals on tape recorder 1. Further, a similar effect is obtained by providing level detector 13 and change components detector 14 in a circuit which reproduces the output of recorder 1.
COPYRIGHT: (C)1980,JPO&Japio
JP8644378A 1978-07-15 1978-07-15 noise reduction system Expired JPS6013621B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8644378A JPS6013621B2 (en) 1978-07-15 1978-07-15 noise reduction system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8644378A JPS6013621B2 (en) 1978-07-15 1978-07-15 noise reduction system

Publications (2)

Publication Number Publication Date
JPS5513577A true JPS5513577A (en) 1980-01-30
JPS6013621B2 JPS6013621B2 (en) 1985-04-08

Family

ID=13887052

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8644378A Expired JPS6013621B2 (en) 1978-07-15 1978-07-15 noise reduction system

Country Status (1)

Country Link
JP (1) JPS6013621B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5554524U (en) * 1978-10-07 1980-04-12

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0525271Y2 (en) * 1988-02-02 1993-06-25

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5554524U (en) * 1978-10-07 1980-04-12
JPS6014888Y2 (en) * 1978-10-07 1985-05-11 マツダ株式会社 Diesel engine swirl chamber

Also Published As

Publication number Publication date
JPS6013621B2 (en) 1985-04-08

Similar Documents

Publication Publication Date Title
US4136314A (en) Adaptive signal weighting system
JPS55117712A (en) Noise reduction circuit of video signal recording and reproducing device
JPS5746306A (en) Aural signal muting circuit of magnetic recorder and reproducer
DE130613T1 (en) NOISE REDUCTION CIRCUIT.
JPS57184381A (en) Video signal processor
JPS5513577A (en) Noise reduction system
KR920017070A (en) High Frequency Adaptive De-emphasis and Re-emphasis in Video Signals Using Recorded Control Signals
JPS5446420A (en) Dubbing system
JPS5525876A (en) Magnetic recording reproducer
JPS57205804A (en) Dynamic bias control type tape recorder
JPS54109411A (en) Compandor circuit for signals
CA2053966C (en) Adaptive deemphasis and reemphasis of high frequencies in a video signal
JPS5613880A (en) Automatic tracking device of variable speed reproduction
JPS5786115A (en) Magnetic recorder
JPS5556775A (en) Noise eliminating circuit
JPS5566150A (en) Noise reduction system
JPS54109412A (en) Compandor circuit for signals
JPS6017173B2 (en) noise reduction device
JPS5552643A (en) Noise reduction unit
JPS5443448A (en) Compressor
JPS5794909A (en) Magnetic recorder and reproducer
JPS5790750A (en) Signal input device
JPS56160119A (en) Equalizing circuit of level ratio between video and voice
JPS5625215A (en) Data separating circuit
JPS6041886B2 (en) noise reduction device