发明名称 |
Method and apparatus for static video telephone transmission/receiving |
摘要 |
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.
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申请公布号 |
US5230015(A) |
申请公布日期 |
1993.07.20 |
申请号 |
US19910688158 |
申请日期 |
1991.04.19 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA;MITSUBISHI ELECTRONICS AMERICA, INC. |
发明人 |
YOKODATE, SHINYA;KANEKO, KOJI;SAIGUSA, KAZUYUKI;MIZUSHIMA, TATSUHIKO;LEWIS, SCOTT A.;FLETCHER, GARY S. |
分类号 |
H04J3/14;H04L27/38;H04N7/14 |
主分类号 |
H04J3/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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