JPS563413A - Noise suppression circuit - Google Patents
Noise suppression circuitInfo
- Publication number
- JPS563413A JPS563413A JP7659279A JP7659279A JPS563413A JP S563413 A JPS563413 A JP S563413A JP 7659279 A JP7659279 A JP 7659279A JP 7659279 A JP7659279 A JP 7659279A JP S563413 A JPS563413 A JP S563413A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- level
- signal
- circuit
- resistances
- 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
Landscapes
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Abstract
PURPOSE: To suppress the signal level of the working noise of a tape recorder, by lowering specially the recording level using the attenuator circuit or the like when the sound pressure level applied to the incorporated mike is low.
CONSTITUTION: Record detection signal Ix is drawn out from the joint of resistances R18 and R20. Now if the base-emitter threshold voltage VBE of transistor 36 in the circuit is set to 0.6V and also pinch-off voltage -VP of FET32 is large enough with signal (e3) of zero, the source voltage Vg is several volts. In such case, the joint voltage of R18 and R20, i.e. detection signal voltage VX can be set to 0.6V or higher by setting both resistances to the proper levels. In that case, transistor 36 is turned on, and resistance R12 and R14 plus filter circuit 38 are formed into the T-type attenuator circuit. Thus the level of record output signal (e3) is attenuated. Accordingly, the signal level for the working noise of a tape recorder can be suppressed.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7659279A JPS563413A (en) | 1979-06-18 | 1979-06-18 | Noise suppression circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7659279A JPS563413A (en) | 1979-06-18 | 1979-06-18 | Noise suppression circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS563413A true JPS563413A (en) | 1981-01-14 |
Family
ID=13609570
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7659279A Pending JPS563413A (en) | 1979-06-18 | 1979-06-18 | Noise suppression circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS563413A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5827930A (en) * | 1981-08-13 | 1983-02-18 | Kawasaki Steel Corp | Production of black plate for tin plate and tin-free steel plate |
JPS5827931A (en) * | 1981-08-13 | 1983-02-18 | Kawasaki Steel Corp | Production of black plate for tin plate and tin-free steel plate |
JPS62146244A (en) * | 1985-12-19 | 1987-06-30 | Nippon Steel Corp | Steel sheet for hermetically sealed vessel excellent in disoxidizing function |
-
1979
- 1979-06-18 JP JP7659279A patent/JPS563413A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5827930A (en) * | 1981-08-13 | 1983-02-18 | Kawasaki Steel Corp | Production of black plate for tin plate and tin-free steel plate |
JPS5827931A (en) * | 1981-08-13 | 1983-02-18 | Kawasaki Steel Corp | Production of black plate for tin plate and tin-free steel plate |
JPS6114215B2 (en) * | 1981-08-13 | 1986-04-17 | Kawasaki Steel Co | |
JPS6114214B2 (en) * | 1981-08-13 | 1986-04-17 | Kawasaki Steel Co | |
JPS62146244A (en) * | 1985-12-19 | 1987-06-30 | Nippon Steel Corp | Steel sheet for hermetically sealed vessel excellent in disoxidizing function |
JPH0627300B2 (en) * | 1985-12-19 | 1994-04-13 | 新日本製鐵株式会社 | Steel plate for closed containers with excellent deoxidation function |
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