A simple and efficient method for producing an obfuscated speech signal which may be used to mask a stream of speech, is disclosed. A speech signal representing the speech stream to be masked is obtained. The speech signal is then temporally partitioned into segments, preferably corresponding to phonemes...http://www.google.com.au/patents/US7505898?utm_source=gb-gplus-sharePatent US7505898 - Method and system for masking speech
