JPS547811A - Noise reduction unit of companding system - Google Patents
Noise reduction unit of companding systemInfo
- Publication number
- JPS547811A JPS547811A JP7471377A JP7471377A JPS547811A JP S547811 A JPS547811 A JP S547811A JP 7471377 A JP7471377 A JP 7471377A JP 7471377 A JP7471377 A JP 7471377A JP S547811 A JPS547811 A JP S547811A
- Authority
- JP
- Japan
- Prior art keywords
- noise reduction
- reduction unit
- companding
- companding system
- frequency band
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
- H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
- H03G9/025—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers frequency-dependent volume compression or expansion, e.g. multiple-band systems
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 effectively perform the reduction in noise and to perform the reproduction of original tone with high fidelity, by companding all the bands of the delivery signal depending on the signal level of a high frequency band, and by changing a low frequency band complementarily with companding according on the sibnal level ration in low and high frequency bands.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7471377A JPS547811A (en) | 1977-06-20 | 1977-06-20 | Noise reduction unit of companding system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7471377A JPS547811A (en) | 1977-06-20 | 1977-06-20 | Noise reduction unit of companding system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS547811A true JPS547811A (en) | 1979-01-20 |
Family
ID=13555127
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7471377A Pending JPS547811A (en) | 1977-06-20 | 1977-06-20 | Noise reduction unit of companding system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS547811A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6490231B1 (en) | 1997-12-25 | 2002-12-03 | Seiko Instruments Inc. | Intermittent feeding mechanism |
JP2016009935A (en) * | 2014-06-23 | 2016-01-18 | ローム株式会社 | Level adjustment circuit, digital sound processor, audio amplifier integrated circuit, electronic apparatus, and automatic level adjustment method of audio signal |
-
1977
- 1977-06-20 JP JP7471377A patent/JPS547811A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6490231B1 (en) | 1997-12-25 | 2002-12-03 | Seiko Instruments Inc. | Intermittent feeding mechanism |
JP2016009935A (en) * | 2014-06-23 | 2016-01-18 | ローム株式会社 | Level adjustment circuit, digital sound processor, audio amplifier integrated circuit, electronic apparatus, and automatic level adjustment method of audio signal |
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