Telephone apparatus with a fixed telephone station coupled to a

Details Telephone apparatus with a fixed telephone station coupled to a Telephone apparatus with a fixed telephone station coupled to a

1986-02-24

1987-05-26

Lev, Robert

Telephonic communications

With check operated control

379 58, 455 41, H04B 502

Patent

active

046691090

ABSTRACT:
A telephone apparatus, such as a public telephone, in which a voice and tone signals transmitting medium between a fixed station connected to a telephone line and a handset detachable from the station is free of disturbance. A modulation circuit for transmitting voice and tone signals from the telephone line to the handset and a demodulation circuit for transmitting voice signals from the handset to the telephone line are included in the station and are connected respectively to a demodulation circuit connected to an earphone of the handset and to a modulation circuit connected to a microphone of the handset, via two low frequency magnetic coupling coils. The circuits contained in the handset are remote supplied by a power supply circuit included in the station, via third magnetic coupling coils.

REFERENCES:
patent: 1558179 (1985-12-01), Yasuda et al.
patent: 4462113 (1984-07-01), Iwata
patent: 4515994 (1985-05-01), Kolle et al.
patent: 4550444 (1985-10-01), Uerel
patent: 4584707 (1986-04-01), Goldberg et al.
patent: 4595795 (1986-06-01), Endo

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