Signal receiver having automatic frequency characteristic adjust

Details Signal receiver having automatic frequency characteristic adjust Signal receiver having automatic frequency characteristic adjust

1986-06-23

1988-10-25

Masnick, Michael A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455164, 455185, 455186, 455340, H04B 126

Patent

active

047809094

ABSTRACT:
A signal receiver generates a reference signal that sweeps frequencies of desired channel bands, and then feeds the reference signal to an input terminal of receiver unit via a signal-switching circuit that performs switching of the desired-channel signal and the reference signal. The signal receiver then detects the signal strength present in plural frequencies of intermediate frequencies delivered to an output terminal of the reference signal, and after storing detected signal data in a memory, the signal receiver compares the detected signal data to desired frequency characteristics. Then, the signal receiver determines tuning voltages of respective tuning circuits so that the differences which arose from the comparison can be minimized. After determining the tuning voltages, these voltages are delivered to respective tuning circuits, and then a switching operation between the reference signal and the desired channel signal is executed before the signal receiver eventually receives the switched signal.

REFERENCES:
patent: 4334323 (1982-06-01), Moore
patent: 4355414 (1982-10-01), Inoue
patent: 4590611 (1986-05-01), Maier et al.
patent: 4654884 (1987-03-01), Sakai et al.
"Computer Controlled Television Channel Selection and Tuner Alignment", by Daniel Dumont and Arno Neelen; IEEE ICCE85 Session V-TV Signal Processing II, Digest of Tehnical Papers, Jun. 1985, pp. 78-79.

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