Television/telephone system with annunciator and intercom featur

Details Television/telephone system with annunciator and intercom featur Television/telephone system with annunciator and intercom featur

1981-08-10

1984-01-24

Pellinen, A. D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

179 37, 179100L, 358 85, H04M 1108

Patent

active

044278470

ABSTRACT:
A television receiver comprises a television system energized by the powerlines of a commercial power grid, a telephone network access system including a microphone disposed in close proximity with the audio speaker of the television system and a remote control system enabling the receiver to be operated in a television mode or a telephone mode. The television receiver according to the invention is characterized by having an annunciator/intercom enabled for operation by the remote control system. In the annunciator mode, the audio section of the television system is disabled and the microphone is connected through a radio-frequency signal transmitter to the power lines for generating a radio-frequency signal for local transmission. A frequency-modulator is included for modulating the radio frequency signal. At least one remotely located radio-frequency receiver coupled to the power lines is provided for receiving and demodulating the radio-frequency signal and rendering audible television receiver user voice signals. The television receiver user can therefore announce a telephone caller when the television receiver is operated in the annunciator mode. Alternately, intercom units may be employed to provide a two-way intercom conversation link between the television receiver user and a remotely located called party.

REFERENCES:
patent: 3355546 (1967-11-01), King
patent: 3492418 (1970-01-01), Tanner
patent: 3816662 (1974-06-01), Shaver et al.
patent: 4175216 (1979-11-01), Kita et al.
patent: 4196317 (1980-04-01), Bartelink
patent: 4338492 (1982-07-01), Snopko
patent: 4349701 (1982-09-01), Snopko
patent: 4356509 (1982-10-01), Skerlos et al.
Elektor; vol. 3, No. 9, Sep. 1977, pp. 9-18 to 9-25; "FM-Mains Intercom".

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