Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1981-03-25
1983-07-05
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
3581931, 3581951, 455182, H04B 126, H03J 728, H03J 726
Patent
active
043922490
ABSTRACT:
There is disclosed an electronic selection apparatus comprising a surface acoustic wave comb filter, in which the local oscillator frequency of an electronic tuner is swept up to a frequency higher than a peak frequency of the surface acoustic comb filter corresponding to a desired channel number (an upward direction), and then swept toward the opposite direction (a downward direction) until a predetermined number of peaks of the comb filter is counted while checking the presence of an AFC signal, whereby an erroneous tuning operation may be prevented, provided that the signal of the desired channel is present within a predetermined range in the vicinity of the receiving frequency of the desired channel.
REFERENCES:
patent: 3864636 (1975-02-01), Fukuda
patent: 3962640 (1976-06-01), Bomba
patent: 3988681 (1976-10-01), Schurmann
patent: 4232397 (1980-11-01), Murata et al.
Acoustic Surface Wave Filter for TV Tuning Circuits-Grice et al., IBM Tech. Disc. Bulletin, vol. 19, No. 3, Aug. 1976, pp. 971-974.
Matsuura Shigeo
Yuki Ikuo
Bookbinder Marc E.
Hitachi , Ltd.
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