Video telephone system

Details Video telephone system Video telephone system

1990-12-17

1994-09-13

Kuntz, Curtis

Television

Two-way video and voice communication

User positioning

348 17, H04M 1100, H04N 714

Patent

active

053473051

ABSTRACT:
Apparatus and method are provided for the simultaneous transmission of video information and audio information in substantially real time over an ordinary voice grade telephone line having limited bandwidth in the range of about 300-3400 Hz. Because of the limited bandwidth of the ordinary telephone line, the video and audio information are compressed before transmission thereof. Each of the video information and audio information is separately compressed, mixed together and then further compressed. After the further compression, a composite signal, which includes the mixture of video and audio information, is asynchronously transmitted over the same bandwidth of the ordinary telephone line. Upon reception, the compressed information is expanded and separate video information and audio information are reproduced for viewing and hearing by the receiving party. To reduce the size of the apparatus, application specific integrated circuits (ASICs) are employed. A state machine controller apparatus is integrated with the ASIC technology to control the transfer and storing of video information and audio information and also to control the operation of the various compression and expansion stages associated with the transmitting and receiving channels.

REFERENCES:
patent: 3873771 (1975-03-01), Kleinerman et al.
patent: 4099202 (1978-07-01), Cavanaugh
patent: 4237484 (1980-12-01), Brown et al.
patent: 4485400 (1984-11-01), Lemelson et al.
patent: 4544950 (1985-10-01), Tu
patent: 4593318 (1986-06-01), Eng et al.
patent: 4715059 (1987-12-01), Cooper-Hart et al.
patent: 4774574 (1988-09-01), Daly et al.
patent: 4849811 (1989-07-01), Kleinerman
patent: 4955048 (1990-09-01), Iwamura et al.
patent: 4985911 (1991-01-01), Emmons et al.
patent: 5130792 (1992-07-01), Tindell et al.
patent: 5164980 (1992-11-01), Bush et al.
"Codec Squeezes Color Teleconferencing Through Digital Phone Lines," J. Anderson et al. of Widcom, Campbell, Calif., Jan. 26, 1984, Electronics, pp. 113-115.
"Design and Performance of an Analysis-By-Synthesis Class of Predictive Speech Coders," Rose et al., Sep. 1990 IEEE Transactions of Acoustics, Speech & Processing, vol. 38, No. 9, pp. 1489-1503.
"Real-Time Implementation and Performance of a 16 Kb/s Low-Delay CELP Speech Coder," Chen et al., S4a.4 of 1990 IEEE, pp. 181-184.
"High Quality 16Kb/s Speech Coding with a One-Way Delay Less than Two ms," Chen, S9.1 of 1990 IEEE, pp. 453-456.
"A 2 ms-Delay Adaptive Code Excited Linear Predictive Coder," Menez et al., S9.2 of 1990 IEEE, pp. 457-460.
"Vector Sum Excited Linear Prediction (VSELP) Speech Coding at 8 kbps," Gerson et al., S9.3 of 1990 IEEE, pp. 461-464.
CH. Herbst, "Fernsehbilder in Schmalen Kanalen" Funkschau, vol. 58, No. 10, pp. 104-106 May 1986 Muchen, Germany.

Affiliated with

Also associated with

Rating

Video telephone system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Video telephone system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video telephone system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1123562