Video Line Concentrator
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
This is a line concentrator for concentrating video terminal signals using TASI (Time Assignment Speech Interpolation)-type techniques over a limited number of transmission lines. N input terminals (e.g., 100) are individually connected to an analog matrix through modems. The N input lines are concentrated over N' (e.g., 16) output lines. Over these N' lines, N1 (e.g., 10) are used for the video data information transmission; N2 (e.g., 4) are used for performing Voice Activity Detection (VAD) operations; and N3 (e.g., 2) are used for transmitting traffic congestion information. Four subroutines, namely, SR1, SR2, SR3 and SR4, are provided for controlling the concentrator operations. Each one of the N2 lines is made to control VAD over N/N2 input lines.