Title:
SOUND RECORDING REPRODUCING CHANGEOVER CIRCUIT
Document Type and Number:
Japanese Patent JP3642084
Kind Code:
B2
Abstract:
PURPOSE: To prevent noise from being superposed on sound recording reproducing head at the time of a reproducing while raising the degree of freedom of relability and design and surely suppressing cost.
CONSTITUTION: At the time of a sound recording, bias currents are supplied from a secondary winding 2S to sound recording reproducing heads 1L, 1R by releasing the shortening of the secondary winding 2S of a bias oscillation transformer 2 while breaking an electronic switch S3 by a switching signal and by shortening a resistor R1 while simultaneously turning a transistor TR1 ON and at the time of a reproducing, the secondary winding 2S is shortened by making the electronic switch S3 a making while stopping the supplying of the switching signal. Thus, noise is prevented from being superposed on the sound reproducing heads 1L, 1R by stopping the supplying of bias currents from the secondary winding 2S to the sound recording reproducing heads 1L, 1R and by reducing noise to be induced in the secondary winding 2S while inserting the resistor R1 in the secondary winding 2S by simultaneously turning the transistor TR1 OFF.
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Inventors:
Suichi Nomura
Application Number:
JP12727495A
Publication Date:
April 27, 2005
Filing Date:
April 27, 1995
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G11B5/027; G11B5/03; H03F3/181; (IPC1-7): G11B5/03; G11B5/027
Domestic Patent References:
| JP59217210A | ||||
| JP1256005A | ||||
| JP62020888Y2 |
Attorney, Agent or Firm:
Masami Sato