Electronics Corporation of Israel, Ltd.

Eci Telecom Ltd.

Teodor Henquin

Joshua Piasecki

Aharon Segev

Ya'acov B Zeev

Reuven Zelinkovsky

Jacob Ben-Zeev

Silvain Schaffer

A digital circuit multiplication system for interconnecting a transmission trunk link having a plurality of bearer channels to a second plurality of telephone communication trunks, with the second plurality exceeding the first. The system comprises transmission apparatus at a first end of the transmission link within which there is apparatus for detecting signals on the second plurality of telephone communication trunks and apparatus for assigning each trunk on which signals are present to an available one of the first plurality of bearer channels and for providing assignment messages indicating such assignments. The speech signals are transmitted in bit reduced form by adaptive differential pulse code modulation (ADPCM) transmitting apparatus which is operative to be coupled to the first plurality of bearer channels. The output of the ADPCM transmitting apparatus is combined with the assignment messages along the first plurality of bearer channels, and the assignment messages are stripped from the speech signals at the other end of the transmission link by a signal receiving and message detection apparatus. A receiving apparatus operates to assign each of the first plurality of bearer channels carrying signals to a corresponding one of the second plurality of trunks in accordance with the assignment information received from the transmission apparatus. The signal receiving and detection apparatus contains delay circuitry for temporarily storing the received signals and detecting whether there are assignment messages contained in them, whereupon if these are detected, a message extractor apparatus replaces them with output signals constituting a predetermined signal pattern.

Combination TASI and ADPCM apparatus

A TASI system for interconnecting a transmission trunk having a first plurality of communication channels with a defined signal transmission frequency band to a second plurality of telephone communication lines, the second plurality exceeding the first end of the transmission trunk including apparatus for detecting signals on the second plurality and apparatus for assigning each telephone communication line on which signals are present to an available one of the first plurality of communication channels; receiving apparatus at a second end of the transmission link including apparatus for assigning each of the first plurality carrying signals to a corresponding one of the second plurality in accordance with assignment information received from the transmission apparatus; and apparatus for communicating messages including assignment information between the transmission apparatus and the receiving apparatus in said signal transmission band in serial data form along said first plurality of communication channels. A speech detector, echo suppressor, control message transmitter and receiver, signalling processor, RAM switching system, multichannel simultaneous serial synchronous bidirectional message communication and high speed speech detection notification apparatus are also disclosed.

Time assignment speech interpolation apparatus

TASI apparatus suitable for use with telephone networks employing interregister multifrequency signalling comprising transmission apparatus at a first end of a transmission trunk link having a first plurality of communication channels, the transmission apparatus including means for detecting signals on a second plurality of telephone communication lines on which signals are present to an available one of the first plurality of communication channels and means for applying a delay to the detected signals, receiving apparatus at a second end of the transmission link including means for assigning each of the first plurality of communication channels carrying signals to a corresponding one of the second plurality of telephone communication lines in accordance with assignment information received from the transmission apparatus, means for communicating messages including assignment information between the transmission apparatus and the receiving apparatus, means for sensing the onset of interregister multifrequency signalling on the second plurality of telephone communication lines, and means for disabling the means for applying a delay to the detected signals in response to the sensed onset of interregister multifrequency signalling.

TASI Apparatus for use with systems having interregister multifrequency

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Kiron, Israel

Teodor Henquin