TH2794EX - How to test the operation of the echo suppressor - Google Patents

Abstract

How to test instruments for echo elimination Recognizing the faults of the various units included in the instrument, one signal is sent out from the sender side, while the remote signal to the instrument is cut off. The received signal (S2), originating from the output signal, is picked up and eliminated by this instrument's resonator. The residual signal (S3) resulting from the search and correction is then compared with the positive and negative limit voltage (T + or T-). The test is performed by measuring the number of selectivity signals per second. Which is higher or lower than the value of the limit voltage

Claims (1)

1. Methods for testing the operation of the echo cancellation apparatus. It is included in the signaling device for the communication system, where the signal is fed into the transmission side (A, B) of the instrument to pass through the hybrid circuit. Two-wire to four-wire (F) with long-distance transmitter The input signal generates a corrective signal (s1) on the receiving side (C, D) of the instrument to rectify the signal (s2) received by the hybrid circuit (F). The signal transmitted from the remote side is cut off, and after the correction signal (s1) has been corrected