Browse Prior Art Database

Television Conference System

IP.com Disclosure Number: IPCOM000100477D
Original Publication Date: 1990-Apr-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Toyonaga, S: AUTHOR

Abstract

A television (TV) conference system is described which consists of more than two TV telephones and a TV conference trunk circuit connected to a TV telephone exchange system as shown in Fig. 1.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 71% of the total text.

Television Conference System

       A television (TV) conference system is described which
consists of more than two TV telephones and a TV conference trunk
circuit connected to a TV telephone exchange system as shown in Fig.
1.

      The purpose of this system is to allow TV telephone users
sporadically located all over the country (or world) to hold a TV
conference easily and comfortably, without going to a TV conference
room.

      The TV conference trunk circuit 5 shown in Fig. 2 comprises
three main circuits, that is, a voice mixing circuit 6, a picture
mixing/ selection circuit 7 and a voice comparison circuit 8.

      After voice and picture links from four TV telephones 1-4 are
connected to the TV conference trunk 5, the voice mixing circuit 6
receives voices from four TV telephones, mixes them and sends a mixed
voice to the four telephones. The picture mixing/selection circuit 7
receives pictures from the four TV telephones, reduces them to 1/4,
sets them into one picture as shown in Fig. 3, and then sends the
mixed picture to the four TV telephones.

      When conversation among TV telephone users starts, the voice
comparison circuit 8 compares the volume of voices from the four TV
telephones 1-4, and chooses a TV telephone (e.g., 1) with the loudest
voice.  Then, the picture mixing/selection circuit 7 sends a
non-reduced picture from the TV telephone 1 to the other TV
telephones (2-4). Meanwhile, the TV telephone 1 continues to receive
t...