JPS5528569A - Noise reduction device - Google Patents
Noise reduction deviceInfo
- 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
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
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)
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 |
-
1978
- 1978-08-18 JP JP53101602A patent/JPS6019564B2/en not_active Expired
Cited By (3)
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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