Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1976-10-05
1982-10-19
Chin, Tommy P.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455165, 455183, H04B 116
Patent
active
043554164
ABSTRACT:
A circuit arrangement for the selection, the tuning and the storage of a frequency of signals receivable in a receiving set is described. The main feature of this circuit, which comprises a controlled oscillator whose frequency is determined by a control loop as a function of a number N, at least a first and a second memory circuit and a control panel, is that of having means for selecting one frequency among a plurality of receivable frequencies; means for optimally tuning said selected frequency; means for storing within the second memory circuit the information about the number N for each selected frequency; and means arranged to utilize the information stored in the second memory, about the number N, so as to enable to select again the optimally tuned frequency.
This circuit arrangement is also provided for a television signal receiving set comprising a line frequency oscillator, to select, tune in and store television channels, and comprises circuit means arranged to increase the value of the number N, when the line oscillator is synchronized by a received signal.
A further embodiment of this circuit arrangement for a television signal receiving set, arranged to select, tune in and store one of a plurality of television channels subdivided into several frequency ranges, comprises circuit means analyzing the number from the first memory circuit and arranged to supply to a tuner of the set information signals for the range change-over switching.
REFERENCES:
patent: 3622913 (1971-11-01), Shipley
patent: 3657661 (1972-04-01), Jarger
patent: 3946148 (1976-02-01), Skerlox
patent: 3961261 (1976-06-01), Pflasterer
patent: 3980951 (1976-09-01), Breeze et al.
patent: 3983484 (1976-09-01), Hodama
patent: 3988696 (1976-10-01), Sharpe
patent: 4000476 (1976-12-01), Walier
patent: 4025953 (1977-05-01), Sideris
patent: 4027242 (1977-05-01), Yamanaka
patent: 4038689 (1977-07-01), Rzeszewski et al.
A. Freq. Synthesizer for TV Receivers, by Eric Breeze, Fairchild Journal of Semi-Conductor Progress, Aug. 1974, vol. 2, No. 8, pp. 3-8.
A Uniquely Simplified TV Tuning System, by Steve Hilliker, IEEE Transactions on Consumer Electronics, Feb. 1976, pp. 61 to 68.
Chin Tommy P.
Indesit Industria Elettrodomestici Italiana S.p.A.
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