Method and apparatus for encoding, transmitting, storing and dec

Television – Two-way video and voice communication – User positioning

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379 9308, H04N 714

Patent

active

061410322

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to the transmission of information over a communication link, such as a telephone line, and to the encoding and decoding of data and to the storage of such encoded information. This application is a continuation in part of U.S. patent application Ser. No. 08/254,164, filed Jun. 6, 1994 for PROCESS AND APPARATUS FOR TRANSMITTING VIDEO SIGNALS OVER A COMMUNICATION LINK.
Common or ordinary voice grade telephone lines have been utilized for a number of years in connection with the transmission and reception of signals, other than audio signals. Common or ordinary voice grade telephone lines are telephone lines that have substantially the same predetermined or standard bandwidth, i.e. about 0-3600 Hz, that make up the substantial majority of telephone lines in the United States, as well as in foreign countries, for providing the telephone linkage among residences, public telephones and most businesses. Ordinary telephone lines have also been used to transmit video signals. The ordinary telephone line, having a bandwidth of about 0-3600 Hz or a transmission rate of about 9.6 kbaud, does not transmit, in real time, a typical full motion commercial television type black and white and/or color video image. The commercial television system displays 512.times.512 pixel images at 30 frames per second and uses about 6 MHz bandwidth while simultaneously transmitting video and audio signals. Because of the large bandwidth required, prior art systems do not enable one to transmit full motion images over an ordinary voice grade telephone line. In connection with the transmission of video and audio signals, the video signal is transmitted over the ordinary telephone line using a first, predetermined bandwidth of the limited bandwidth of the ordinary telephone line and the audio signal is transmitted using a second, predetermined bandwidth of the limited bandwidth of the ordinary telephone line. U.S. Pat. No. 4,849,811 to Kleinerman, issued Jul. 18, 1989, and entitled "Simultaneous Audio and Video Transmission with Restricted Bandwidth" describes a system in which modulated digitized image signals and filtered voice signals are transmitted together over an ordinary telephone line whereby still or freeze-frame images are provided with accompanying video. The digitized image signals are in the range of 2400 to less than about 400 Hz. A low pass filter limits the voice signals to a range outside the digitized image signals so that the image signals and voice signals can be transmitted at the same time but over separated sections of the limited bandwidth of the telephone line. Because of the separate bandwidths used, means must be provided for synchronizing the sending and/or receiving of the video and audio signals at the received end. In conjunction with the more rapid transmission of video images, the use of known data compression techniques is mentioned in this patent. Similarly, in U.S. Pat. No. 3,873,771 to Kleinerman, issued Mar. 25, 1975, and entitled "Simultaneous Transmission of a Video and an Audio Signal Through an Ordinary Telephone Transmission Line", a communication system is disclosed for transmitting video and audio information using separate bandwidths of the limited bandwidth of an ordinary telephone line. With regard to the transmission of video information, it is accomplished using slow scan TV techniques so that an image is not transmitted in real time, but rather the transmission requires up to about 8 seconds to transmit an image with 120 scan lines per image.
In another technique for transmitting video and audio signals, two signals are multiplexed in such a way to enable one of the two signals to be sent when the other of the two signals is not being transmitted.
These prior art systems are not capable of transmitting, in real time, the audio and the moving video image data together over an ordinary voice grade telephone line. Such prior systems require from about 3-60 seconds to transmit a still image. This occurs because voice grade telephone

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