Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-11-27
1981-12-08
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455199, H04B 116
Patent
active
043051588
ABSTRACT:
A television tuner comprises a high frequency amplifier for receiving a high frequency signal received by an antenna, a local oscillator, and a mixer for mixing the high frequency signal from the high frequency amplifier and the oscillation frequency signal from the local oscillator for providing an intermediate frequency signal. The high frequency amplifier comprises a high frequency amplifying transistor, and a group of acoustic surface wave filter elements each exhibiting a high band pass characteristic corresponding to each of the television channels. The output of each filter in the filter group is transferred to the mixer through a corresponding switching device among a corresponding plurality of semconductor switching devices individually coupled between the corresponding output terminals of the filters and the ground by turning off the semiconductor switching device corresponding to a desired channel and turning on the remaining switching devices. These semiconductor switching devices are adapted to be on/off controlled individually in response to corresponding flip-flops adapted to be selectively set in response to a channel selection switch. The local oscillator comprises another group of acoustic surface wave resonators each exhibiting a resonance characteristic corresponding to a channel and a feedback loop. The respective resonators are selectively enabled or disabled by means of a corresponding plurality of semiconductor switching devices in the same manner as done in the above described filters.
REFERENCES:
patent: 3264566 (1966-08-01), Kaufman et al.
patent: 3555431 (1971-01-01), Wilcox
patent: 3602823 (1971-08-01), Carter
patent: 3757260 (1973-09-01), Fujita
patent: 3766496 (1973-10-01), Whitehouse
patent: 3798463 (1974-03-01), Ikeguchi et al.
patent: 3831116 (1974-08-01), Davis, Jr. et al.
Fujishima Satoru
Nakayama Fumio
Murata Manufacturing Co. Ltd.
Ng Jin F.
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