Patent ID: 7979274
Filing Date: 2011-07-12
Classification: G10L

Abstract:
1. A method of modifying a speech signal for reducing the likelihood for recognition of the speech signal by a speech recognition system, the method comprising: receiving at least one prosody sample; and modifying at least one prosody characteristic of an initial speech signal based on the at least one prosody sample, thereby generating a modified speech signal, the modified speech signal being less likely to be recognized by a speech recognition system than the initial speech signal, wherein the modified speech signal is further altered by: (a) obtaining an acceptable frequency range; (b) calculating a random frequency signal; (c) comparing the random frequency signal to the acceptable frequency range; (d) repeating steps (b) and (c) in response to the calculated random frequency signal not being within the acceptable frequency range; and (e) overlaying the random frequency signal onto the modified speech signal in response to the random frequency signal being within the acceptable frequency range.