JPS5530268A - Noise reduction unit - Google Patents

Noise reduction unit

Info

Publication number
JPS5530268A
JPS5530268A JP10405078A JP10405078A JPS5530268A JP S5530268 A JPS5530268 A JP S5530268A JP 10405078 A JP10405078 A JP 10405078A JP 10405078 A JP10405078 A JP 10405078A JP S5530268 A JPS5530268 A JP S5530268A
Authority
JP
Japan
Prior art keywords
signal component
frequency signal
level
low
emphasis
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
JP10405078A
Other languages
Japanese (ja)
Other versions
JPS6041886B2 (en
Inventor
Katsuhisa Nishimura
Seiji Fujisawa
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP53104050A priority Critical patent/JPS6041886B2/en
Publication of JPS5530268A publication Critical patent/JPS5530268A/en
Publication of JPS6041886B2 publication Critical patent/JPS6041886B2/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 eliminate completely a part where companding characteristics vary with a level by composing a variable emphasis unit, controlled corresponding to a content ratio of a high-frequency signal component to a low-frequency signal component, of a linear-companding type compander.
CONSTITUTION: Corresponding to a signal component ratio of a high-frequency signal component to a low-frequency signal component, emphasis characteristics of variable pre-emphasis circuit 2 and variable de-emphasis circuit 12 are controlled. Namely, the high-frequency signal component is separated by high-pass filter 5 and its level is detected by level sensor 7; and the low-frequency signal component, on the other hand, is separated by low-pass filter 6 and its level is detected by level sensor 8. Then, the output levels of respective level sensors 7 and 8 are applied to amplitude-ratio detector 9, which outputs a signal corresponding to a signal level ratio of the high-frequency signal component to the low-frequency signal component, and the emphasis value is controlled by a control signal from this detector 9.
COPYRIGHT: (C)1980,JPO&Japio
JP53104050A 1978-08-25 1978-08-25 noise reduction device Expired JPS6041886B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53104050A JPS6041886B2 (en) 1978-08-25 1978-08-25 noise reduction device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53104050A JPS6041886B2 (en) 1978-08-25 1978-08-25 noise reduction device

Publications (2)

Publication Number Publication Date
JPS5530268A true JPS5530268A (en) 1980-03-04
JPS6041886B2 JPS6041886B2 (en) 1985-09-19

Family

ID=14370374

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53104050A Expired JPS6041886B2 (en) 1978-08-25 1978-08-25 noise reduction device

Country Status (1)

Country Link
JP (1) JPS6041886B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01129603A (en) * 1987-11-16 1989-05-22 Sony Corp Sound signal processor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01129603A (en) * 1987-11-16 1989-05-22 Sony Corp Sound signal processor

Also Published As

Publication number Publication date
JPS6041886B2 (en) 1985-09-19

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