Communication method and equipment for freeze-frame video phone

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network

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379 97, 375 58, 371 55, H04M 1100

Patent

active

051990610

ABSTRACT:
The present invention comprises a system bus performing control and data transmission function among modules, a system control means, connected to the system bus, performing system control and interrupt control function, a modem and DTMF signal processing means, connected to the system bus, performing modulation and demodulation in the transmission rate of 9,600 bps, 4,800 bps, and 2,400 bps, and transmission and reception of DTMF signal, a standard telephone line connection means connecting the modem and DTMF signal processing means and a telephone to a standard telephone line, a program ROM, connected to the system bus, storing a program which controls communication through the modem and DTMF signal processing means, and a RAM, connected to the system bus, retaining current data.

REFERENCES:
patent: 4236248 (1980-11-01), Teramura et al.
patent: 4606044 (1986-08-01), Kudo
patent: 4630126 (1986-12-01), Kaku et al.
patent: 4710925 (1987-12-01), Negi
patent: 4881253 (1989-11-01), Takeuchi et al.
patent: 4939767 (1990-07-01), Saito et al.
J. W. Cronin, "Dial-Up Video Speeds Business Decisions", Telephony, vol. 210, No. 13, pp. 32, 33, Mar. 31, 1986.

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