Method and apparatus for static video telephone transmission/rec

Details Method and apparatus for static video telephone transmission/rec Method and apparatus for static video telephone transmission/rec

1991-04-19

1993-07-20

Dwyer, James L.

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

358 23, 375 97, 455 71, H04M 1100, H04N 712

Patent

active

052300153

ABSTRACT:
A static video telephone for sending an image captured by an image capture-system and receiving a video signal transmitted over a telephone line. A video signal formed for transmission has a frame format including a phase shift correction data signal in addition to a frame synchronization signal, an amplitude calibration signal, an ID (information data) signal, and image data signal. The video telephone includes a frequency shift correction data generating circuit which is activated when frequency shifts are detected in the received signal and produces frequency-shift correction data. The frequency-shift correction data is then delivered to a subsequent demodulation timing generating circuit which scales phase errors in the received signal to produce phase error correction data. Both frequency-shift correction data and phase error correction data are combined together to produce a demodulation timing signal. With this signal, the received signal is demodulated.

REFERENCES:
patent: 4485400 (1984-11-01), Lemelson et al.
patent: 4715059 (1987-12-01), Cooper-Hart et al.
patent: 4881253 (1989-11-01), Takeuchi et al.
patent: 4932047 (1990-06-01), Emmons et al.
patent: 4979028 (1990-12-01), Minematsu et al.
"Television Technics & Electronics" vol. 36 pp. 19-35, Sep. 1988.

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