| 摘要 |
A television receiver signal translating system includes a tuner frequency-converting a received broadcast signal to an intermediate frequency signal. An acoustic surface wave filter and gain controlled amplifier are coupled to the tuner and drive a synchronous detecting system. An automatic gain control (AGC) maintains the output of recovered signal constant while a variable bandwidth stage changes the system frequency response as a function of signal strength. A variable influence sound carrier trap responds to the AGC providing increased sound carrier attenuation when strong signals are received and reduced attenuation during weak signal reception.
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