JPS5513577A - Noise reduction system - Google Patents
Noise reduction systemInfo
- 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
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5554524U (en) * | 1978-10-07 | 1980-04-12 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0525271Y2 (en) * | 1988-02-02 | 1993-06-25 |
-
1978
- 1978-07-15 JP JP8644378A patent/JPS6013621B2/en not_active Expired
Cited By (2)
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 |
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