发明授权
- 专利标题: Television sound receiver
- 专利标题(中): 电视声音接收器
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申请号: US341465申请日: 1982-01-21
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公开(公告)号: US4419695A公开(公告)日: 1983-12-06
- 发明人: Yoshihiro Yamamoto , Masayuki Hongu , Shigeru Ohmuro , Hiromi Kawakami
- 申请人: Yoshihiro Yamamoto , Masayuki Hongu , Shigeru Ohmuro , Hiromi Kawakami
- 申请人地址: JPX Tokyo
- 专利权人: Sony Corporation
- 当前专利权人: Sony Corporation
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX56-12564 19810129
- 主分类号: H04N5/60
- IPC分类号: H04N5/60
摘要:
A television sound receiver having an input terminal for receiving a television sound signal, a tuner including a local oscillator connected to the input terminal, an intercarrier sound demodulating circuit connected to the tuner, a split-carrier sound demodulating circuit, including a limiter amplifier connected to the tuner, a sound signal output terminal, and a switching device for selectively and operatively connecting either the intercarrier or split-carrier sound demodulating circuits between the tuner and the sound signal output terminal. Additionally, the receiver includes an error detecting device connected to the split-carrier sound demodulating circuit for detecting the frequency error of the local oscillator and a first operational device which is responsive to an output signal from the error detecting device and which produces a first operational device output signal which activates the switching device such that the split-carrier sound demodulating circuit is operatively connected between the tuner and the sound output terminal when the output signal from the error detecting device is less than a predetermined level. Level detectors are connected to the limiter amplifier and detect a level of the split-carrier sound signal. A second operational device, which is responsive to the output signal from the level detectors, produces an output signal which activates the switching device such that the intercarrier sound demodulating circuit is operatively connected between the tuner and the sound output terminal when the output signals from the level detectors are less than a predetermined value.
公开/授权文献
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