发明名称 |
Audio magnetic recording and/or reproducing apparatus utilizing frequency modulation |
摘要 |
A rotary head type magnetic recording and reproducing apparatus comprises a circuit for recording and reproducing a signal on and from a magnetic recording medium by rotary heads, a circuit for obtaining a frequency modulated (FM) audio signal by frequency-modulating a carrier by an audio signal which is to be recorded, a circuit for generating a frequency drift detection signal having a constant frequency which does not exist within a frequency range occupied by the FM audio signal, a circuit for obtaining a frequency multiplexed signal by frequency-multiplexing the FM audio signal and the detection signal, a circuit for separating the FM audio signal and the detection signal from the signal reproduced by the rotary heads, a demodulating circuit for obtaining an audio signal by frequency-demodulating the separated FM audio signal, a detecting circuit for frequency-demodulating the separated detection signal and for detecting a frequency drift component, a circuit for forming a frequency drift correction signal responsive to the output of the detecting circuit, and a circuit for correcting a frequency drift component in the output audio signal of the demodulating circuit by the correction signal.
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申请公布号 |
US4698693(A) |
申请公布日期 |
1987.10.06 |
申请号 |
US19850727757 |
申请日期 |
1985.04.26 |
申请人 |
VICTOR COMPANY OF JAPAN, LTD. |
发明人 |
ISHIGAKI, YUKINOBU;NAMIKI, YASUOMI;FUJIWARA, HISASHIGE;HIROHASHI, KAZUTOSHI |
分类号 |
G11B5/035;G11B20/06;G11B20/22;H04N5/95;H04N9/802;H04N9/835;(IPC1-7):H04N5/782 |
主分类号 |
G11B5/035 |
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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