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    • 7. 发明授权
    • Receiver selectively receiving, demodulating and outputting a tv broadcast signal and an FM radio broadcast signal
    • 接收机选择性地接收,解调和输出电视广播信号和FM无线电广播信号
    • US06633345B2
    • 2003-10-14
    • US09739253
    • 2000-12-19
    • Hiroshi IzutaAkio Ohnishi
    • Hiroshi IzutaAkio Ohnishi
    • H04N544
    • H04N5/44H04N5/46
    • A receiver includes a tuner that converts an FM radio broadcast signal into an intermediate frequency signal that has the same frequency as a sound intermediate frequency subcarrier signal when receiving the television broadcast signal and outputs the intermediate frequency signal when receiving the FM radio broadcast signal, a SAW filter passing only an intermediate frequency band of the output of the tuner, a video detector detecting a video signal containing a sound subcarrier signal when receiving the television broadcast signal and detecting a sound subcarrier signal when receiving the FM radio broadcast signal, a VIFAGC circuit making the video signal have a constant amplitude, and an AGC circuit making a sound subcarrier signal output from a band pass filter have a constant amplitude.
    • 接收机包括调谐器,其在接收到电视广播信号时将FM无线电广播信号转换为具有与声音中频子载波信号相同频率的中频信号,并在接收到FM无线电广播信号时输出中频信号 SAW滤波器仅通过调谐器的输出的中频带,视频检测器,当接收到电视广播信号时检测包含声音副载波信号的视频信号,并在接收到FM无线电广播信号时检测声音副载波信号; VIFAGC电路 使得视频信号具有恒定的幅度,并且使得从带通滤波器输出的声音副载波信号的AGC电路具有恒定的幅度。