Speech signal distortion measurement which varies as a function of the distribution of measured distortion over time and frequency

摘要

PCT No. PCT/GB94/02562 Sec. 371 Date Apr. 4, 1996 Sec. 102(e) Date Apr. 4, 1996 PCT Filed Nov. 22, 1994 PCT Pub. No. WO95/15035 PCT Pub. Date Jun. 1, 1995Telecommunications testing apparatus includes an analyzer arranged to receive a distorted signal which corresponds to a test signal when distorted by telecommunications aparatus to be tested. The analyzer periodically derives, from the distorted signal, a plurality of spectral component signals responsive to the distortion in each of a plurality of spectral bands, over a succession of time intervals. The analyzer generates a measure of the subjective impact of the distortion due to the telecommunications apparatus, the measure of subjective impact being calculated to depend upon the spread of the distortion over time and/or over the spectral bands.