Videotelephone apparatus for transmitting high and low resolution video signals over telephone exchange lines
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United States of America Patent
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Dec 19, 1989
Grant Date -
N/A
app pub date -
Jun 28, 1988
filing date -
Jun 30, 1987
priority date (Note) -
Expired
status (Latency Note)
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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.
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