JPS5567916A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- Publication number
- JPS5567916A JPS5567916A JP14129278A JP14129278A JPS5567916A JP S5567916 A JPS5567916 A JP S5567916A JP 14129278 A JP14129278 A JP 14129278A JP 14129278 A JP14129278 A JP 14129278A JP S5567916 A JPS5567916 A JP S5567916A
- Authority
- JP
- Japan
- Prior art keywords
- bias
- frequency
- low
- oscillation output
- currents
- 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
- Amplifiers (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
PURPOSE: To equalize bias currents for high, middle and low frequency ranges by making the impedance of a trap circuit, preventing a bias oscillation output from leaking to a recording amplifier side, greater than a middle-frequency-range bias oscillation output.
CONSTITUTION: Bias currents for high, middle and low frequency ranges from transformer 2 coupled with bias oscillation circuit 1 are applied to heads 6 and 6' together with a recording signal, without leaking to a recording amplifier side, by way of capacitors C1WC3, resistance R0, trap coils 3 and 3', capacitors C8 and C8', etc. With switch S1 connected to contact fM in accordance with the middle-frequency bias current, the impedance of a trap circuit applied with high and low-frequency bias currents equal in level is increased by resistance R0 and the middle-frequency bias current becomes the same current as high and low-frequency bias currents and are applied to heads 6 and 6' to select a bias current for a desired band, so that an influence of a bias oscillation output will be prevented from being exerted in reception of radio broadcasting.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14129278A JPS5936328B2 (en) | 1978-11-15 | 1978-11-15 | magnetic recording and playback device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14129278A JPS5936328B2 (en) | 1978-11-15 | 1978-11-15 | magnetic recording and playback device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5567916A true JPS5567916A (en) | 1980-05-22 |
JPS5936328B2 JPS5936328B2 (en) | 1984-09-03 |
Family
ID=15288484
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14129278A Expired JPS5936328B2 (en) | 1978-11-15 | 1978-11-15 | magnetic recording and playback device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5936328B2 (en) |
-
1978
- 1978-11-15 JP JP14129278A patent/JPS5936328B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5936328B2 (en) | 1984-09-03 |
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