Interrupting the video if signal path during FM radio mode in a

Details Interrupting the video if signal path during FM radio mode in a Interrupting the video if signal path during FM radio mode in a

1990-08-23

1992-08-25

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358189, 358196, 358198, 4551891, 455315, H04N 550

Patent

active

051423707

ABSTRACT:
A television receiver includes a single tuner for tuning both television channels and broadcast FM stations. The tuner serves as the first conversion stage of a double conversion FM receiver, wherein the mixer of an FM radio integrated circuit serves as the second conversion stage. The receiver provides an on-screen display of the currently tuned FM channel number. Circuitry is provided for interrupting the path of signals from the tuner to the IF amplifier stage of the television receiver when the receiver is in FM radio signal reception mode, to prevent the FM radio signals from adversely affecting the television synchronizing signals during the display of the FM channel number.

REFERENCES:
patent: 2650265 (1953-08-01), Mountjoy
patent: 4272788 (1981-06-01), Ogita
patent: 4490743 (1984-12-01), Mycynek
patent: 4499602 (1985-02-01), Hermeling
patent: 4553264 (1985-11-01), Hasegawa
patent: 4581643 (1986-04-01), Carlson
patent: 4709407 (1987-11-01), Baba
patent: 4726072 (1988-02-01), Yamashita
patent: 4814874 (1989-03-01), Adachi
patent: 4970087 (1990-11-01), Rumreich
Page 2-1 of RCA/GE Color Television Service Data CTC156/157.
Page 2-3 of RCA/GE Color Television Supplemental Service Data CTC156/157-S1.
Article entitled TV Mulitchannel Sound-The BTSC System, by C. G. Eilers, published in IEEE Transactions on Consumer Electronics, Feb. 1985.

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