| 摘要 |
<p>A method of testing an apparatus for adaptive echo cancellation with regard to faults in the included units. A signal is sent from the send side, while the remote signal to the apparatus is disconnected. The received signal (s2) originating from the send signal is sampled and cancelled by the echo canceller of the apparatus, and the thus obtained corrected sampled receive signal (s3) is compared with a positive and a negative threshold value (+T or -T). As a measure of the test is taken the number of samples per second which exceeds or falls below the threshold values.</p> |
