Testing circuit and method for a codec hybrid balance network

Details Testing circuit and method for a codec hybrid balance network Testing circuit and method for a codec hybrid balance network

1995-11-03

1998-02-10

Kuntz, Curtis

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of hybrid or echo suppressor or canceller

379 6, 379 10, 379 21, 370252, 375224, H04M 124, H04M 308, H04M 322

Patent

active

057177368

ABSTRACT:
A telephone system coder/decoder (CODEC) having improved access for testing CODEC components and a method of testing a CODEC in which a test signal is not contaminated by passage through CODEC filters. Input test pads are positioned between the receive channel filters and the connection of the receive channel to the hybrid balance network, and an output test pad is positioned between the transmit channel filters and the connection of the transmit channel to the hybrid balance network. Test signals selectively applied to the test pads or to CODEC terminals indicate operation of receive programmable gain section, hybrid balance network frequency response, hybrid balance network echo cancellation, and the transmit buffer, buffer splitter and transmit programmable gain section in the transmit channel. The test signals do not go through the transmit and receive filters.

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