Field telephone system

Details Field telephone system Field telephone system

1989-04-11

1991-05-07

Safourek, Benedict V.

Telecommunications

Transmitter

Angle modulation

455 75, 455119, 455114, H04B 102, H04B 140

Patent

active

050143476

ABSTRACT:
A field telephone system having a widely dispersed set of telephone lines including a page line pair and a party line pair, audio processing equipment including telephone handsets, handset amplifiers, receiver amplifiers and paging speaker amplifiers is designed to have improved voice transmission by provision of a narrow band FM carrier system. The FM carrier system includes a device for generating a carrier frequency signal, a modulator for modulating the carrier frequency with an audio signal derived from one of the handsets at a transmitting station and circuitry for transmitting the modulated signal over a line pair to a receiving station. The receiving station includes circuitry responsive to the transmitted signal and the carrier frequency signal for extracting the audio component of the transmitted signal and for processing the extracted audio signal and for providing the processed audio signal to a handset at the receiving station. A frequency mixing arrangement is utilized to provide a low distortion carrier signal since the system otherwise prevents the use of ordinary filtering techniques.

REFERENCES:
patent: 3175170 (1965-03-01), Duyne
patent: 3706039 (1972-12-01), Bott
patent: 3838355 (1974-09-01), Papaieck
patent: 4610030 (1986-09-01), Dominguez et al.

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