Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electronics America, Inc.

Kazuyuki Saigusa

Shinya Yokodate

Hitoshi Fujimoto

Koji Kaneko

Tatsuhiko Mizushima

Gary S Fletcher

Junichi Sakamoto

Lawrence D Emmons

Hiroshi Ohtsuka

Fumiaki Komatsu

Kenichi Kashiwagi

Akira Teshima

Akifumi Kabasawa

Janet Miller

Scott A Lewis

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.

Method and apparatus for static video telephone transmission/receiving

A still picture video telephone transmission system for transmitting and receiving, via a telephone line, a still picture taken by a camera; a picture signal is transmitted and received by a transmitting circuit and a receiving circuit, to which improvements are made so as to display a still picture clearly without distortion. For this purpose, the transmitting circuit sends picture element signals together with image correcting signals such as a picture element displacement detecting signal, a phase inversion detecting signal, and settling data. The receiving circuit detects the image correcting signals in the picture element signal, and makes the necessary corrections so as to enable the still picture to be displayed in good shape.

Still image video telephone transmission system

A still picture video telephone apparatus adapted to transmit and receive, through a telephone line, still picture information from a television camera or the like, during a telephone call, includes a picture memory for storing a plurality of pages of picture information consisting of a camera-taken picture memory portion which rewrites still picture information input therein delivered from the television camera at intervals of a predetermined period, a self-prepared picture memory portion which stores desired still picture information until arrival of a rewrite instruction, and an incoming picture memory portion which sequentially rewrites still picture information therein upon receipt of still picture information when its storage regions are filled up, memory region input information for setting up regions for the self-prepared picture memory portion and the incoming picture memory portion within the picture memory, and picture memory control circuit for controlling still picture information input to and output from the picture memory based on the memory region information, wherein the picture memory is capable of storing a plurality pages of still picture information and allocating memory regions to the self-prepared picture memory portion and the incoming picture memory portion in various ways.

Apparatus for still picture video telephone apparatus and methods for

Growing community of inventors

Kamakura, Japan

Kazuyuki Saigusa