Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1988-05-11
1990-08-28
Ng, Jin F.
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
358 85, 358134, H04M 1100, H04N 714
Patent
active
049531964
ABSTRACT:
A video phone comprising an input device for entering input image data to be transmitted, a circuit for digitizing the input image data into digital image data, a memory for storing the digital image data, a first circuit for producing an output image signal based on the digital image data from the memory, a display device for displaying an image of the output image signal, a second circuit for compressing the digital image data from the memory into compressed image data, a telephone part having telephone functions, a line control circuit coupled to a public analog telephone line for selectively coupling the second circuit and the telephone part to the public analog telephone line, and a control device. The control device controls at least the memory and the second circuit so that the compressed image data related to the input image data is read out from the memory and supplied simultaneously to the first and second circuits in an image transmitting mode and the compressed image data related to a voice frequency signal received through the public analog telephone line is stored in the memory and read out therefrom to be supplied to the first circuit in an image receiving mode.
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Ishikawa Masaaki
Ishikawa Yasunori
Kuwata Koji
Murayama Noboru
Shimura Hiroshi
Chan Wing F.
Ng Jin F.
Ricoh & Company, Ltd.
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