Remote Terminal Speaker Verification.

摘要

A study was conducted to develop a speaker verification system for use over a degraded channel such as a telephone line. A test of the current speaker verification technology was performed on a set of data which had been processed through the RADC Digital Communications Experiment facility (DICEF) to simulate a telephone channel. The simulated channel introduced an amplitude distortion, phase delay, and noise onto the analog data set. The noise did not present any particular problem other than to raise the spectral errors of both the true speakers and the impostors, and the phase delay was also not a factor. The amplitude distortion was found to cause problems with time registration of the phrases and to result in an overall loss of information for speaker discrimination. To compensate the speaker verification system for these problems, a band-limited spectrum corresponding to the average band-pass characteristic of a telephone line was used for time registration, and the channel resistant pitch-period was added as an additional attribute for speaker discrimination.