JPS5528569A - Noise reduction device - Google Patents

Noise reduction device

Info

Publication number
JPS5528569A
JPS5528569A JP10160278A JP10160278A JPS5528569A JP S5528569 A JPS5528569 A JP S5528569A JP 10160278 A JP10160278 A JP 10160278A JP 10160278 A JP10160278 A JP 10160278A JP S5528569 A JPS5528569 A JP S5528569A
Authority
JP
Japan
Prior art keywords
reproduction
signal
noise
given
compression
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
JP10160278A
Other languages
Japanese (ja)
Other versions
JPS6019564B2 (en
Inventor
Masaru Nishimura
Tetsuo Shimizu
Kenichi Sato
Takehiko Asano
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP53101602A priority Critical patent/JPS6019564B2/en
Publication of JPS5528569A publication Critical patent/JPS5528569A/en
Publication of JPS6019564B2 publication Critical patent/JPS6019564B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE: To obtain the reproduction signal featuring the reduced noise occurring at the area near the band dividing boundary by giving the compression recording to the signals divided into two bands with application of the fixed negative feedback control given at the processing time of the expanded reproduction signal.
CONSTITUTION: The pressed signal is divided into the continuous two bands via LPF16 and HPF18 of compression circuit 23 and then receives the compression recording by tape recorder 11 in accordance with the recording speed and via voltage control-type amplifiers 3 and 12 which are controlled by level sensors 5 and 14 each, adder circuit 22 and others. For this compressed signal, the noise is piled on the low-band high-band boundary part according to the cut-off properties of LPF16 and HPF18 each. The expanding reproduction is given to the compression recording according to the reproduction velocity of recorder 11, and then the negative feedback is given to the output of expanding circuit 23' of the similar constitution toward the input side of amplifier 22. As a result, the piled noise can be eliminated from the output of amplifier 22, and the reproduction output features the low noise. Thus the reproduction faithful to the original signal is ensured.
COPYRIGHT: (C)1980,JPO&Japio
JP53101602A 1978-08-18 1978-08-18 noise reduction device Expired JPS6019564B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53101602A JPS6019564B2 (en) 1978-08-18 1978-08-18 noise reduction device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53101602A JPS6019564B2 (en) 1978-08-18 1978-08-18 noise reduction device

Publications (2)

Publication Number Publication Date
JPS5528569A true JPS5528569A (en) 1980-02-29
JPS6019564B2 JPS6019564B2 (en) 1985-05-16

Family

ID=14304927

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53101602A Expired JPS6019564B2 (en) 1978-08-18 1978-08-18 noise reduction device

Country Status (1)

Country Link
JP (1) JPS6019564B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57190477A (en) * 1981-05-18 1982-11-24 Hitachi Ltd Noise suppressing circuit
JPS6423119U (en) * 1987-07-30 1989-02-07

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57190477A (en) * 1981-05-18 1982-11-24 Hitachi Ltd Noise suppressing circuit
JPH0125128B2 (en) * 1981-05-18 1989-05-16 Hitachi Ltd
JPS6423119U (en) * 1987-07-30 1989-02-07

Also Published As

Publication number Publication date
JPS6019564B2 (en) 1985-05-16

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