Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1988-06-28
1989-12-19
Ng, Jin F.
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
379 96, 358 85, H04M 1100, H04N 714
Patent
active
048887951
ABSTRACT:
In an audiovisual communication, a first high fram rate video signal is derived from a motion image and converted to a low fram rate low resolution multiframe signal. A second high frame rate video signal is derived from an still image and converted to a single frame high resolution signal. Because of the low frame rates, the frequencies of the low and high resolution signals are within the range of frequencies of a telephone exchange line. A switching matrix is provided to sequentially couple both the low and high resolution signals to a transmission line in response to a mode select signal. The single frame high resolution signal is stored into a memory at the receiving end and repeatedly retrieved out of the memory into a display through the switching matrix.
REFERENCES:
patent: 3781477 (1973-12-01), Johannesson
patent: 4258387 (1981-03-01), Lemelson
Peter Klein, "Desktop Teleconferencing", Siemens Telcom Report, Jan./Feb. 1987.
Stephen Weinstein, "Telecommunications in the Coming Decades", IEEE Spectrum, Nov. 1987.
Ando Fumio
Ichinokawa Kazuo
Yokoyama Takayuki
Lewis Bonita
NEC Corporation
Ng Jin F.
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