Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1995-05-31
1996-10-08
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
455295, 455307, 455339, H04B 110
Patent
active
055640931
ABSTRACT:
A frequency modulation receiving apparatus comprises a signal-converting circuit for converting a signal received by an antenna into a signal consisting of wave clusters having various frequencies, first limiting circuit for limiting those of the wave clusters which have frequencies outside a first frequency range, second limiting circuit for limiting those of the wave clusters which have frequencies outside a second frequency range narrower than the first frequency range, shearing circuit for combining and outputting a ratio of a signal output by the first limiting circuit and a signal output by the second limiting circuit, frequency-demodulating circuit for frequency-demodulating a signal output by the selecting circuit, detecting circuit for detecting whether or not an adjacent interfering wave exists in a signal output by the frequency-demodulating circuit, and for outputting a signal indicating whether or not an adjacent interfering wave exists in the signal, and control circuit for delaying a signal output by the detecting circuit and supplying the signal to the selecting circuit, thereby to control the selecting circuit.
REFERENCES:
patent: 4352208 (1982-09-01), Schroeder
patent: 4356568 (1982-10-01), Ogita et al.
patent: 4551755 (1985-11-01), Matsuda et al.
patent: 4563651 (1986-01-01), Ohta et al.
patent: 4907293 (1990-03-01), Ueno
patent: 5241697 (1993-08-01), Hansen
European Search Report, Application No. EP 92 11 9801, Mar. 1, 1993.
Patent Abstract of Japan, vol. 8, No. 229 (Oct. 1984).
Eisenzopf Reinhard J.
Kabushiki Kasiha Toshiba
Sobutka Philip J.
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