发明名称 |
SOUND RECORDING BIAS CIRCUIT |
摘要 |
PURPOSE:To keep a sound recording bias signal stably against ambient temperature change and to obtain superior sound recording performance and erasing efficiency by controlling a bias oscillation signal outputted from a bias oscillation circuit by a control circuit actuated by DC voltage obtained by rectifying a recording bias signal outputted from an amplifier circuit. CONSTITUTION:The bias oscillation signal inputted from the bias oscillation circuit 1 to the amplifier circuit 2 is controlled by the control circuit 3 (limiter) actuated by the DC voltage obtained by extracting a part of the sound recording bias signal outputted from the amplifier circuit 2 and rectifying the extracted signal. If the amplifier circuit 2 is actuated as a limiter by holding bare gain in the amplifier circuit 2 sufficiently highly, the sound recording bias is hardly drifted against the peripheral temperature, so that sound recording frequency and erasing efficiency characteristics can be secured without influence due to the ambient temperature. |
申请公布号 |
JPS6013307(A) |
申请公布日期 |
1985.01.23 |
申请号 |
JP19830119704 |
申请日期 |
1983.06.30 |
申请人 |
MATSUSHITA DENKI SANGYO KK |
发明人 |
KUROOKA TAKASHI;SANBE MAMORU;SATOU HIROO |
分类号 |
G11B5/03;(IPC1-7):G11B5/03 |
主分类号 |
G11B5/03 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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