Patent ID: 7558389
Filing Date: 2009-07-07
Classification: G10L

Abstract:
1. A method of generating a speech signal comprising the steps of: prompting a user for a response; obtaining a prosody sample from the response; modifying at least one prosody characteristic of a speech signal based on the prosody sample to create a prosody modified speech signal; (a1) obtaining an acceptable frequency range; (a2) calculating a random frequency signal, the random frequency signal calculation comprising (b1) obtaining a first random number, (b2) measuring a variable parameter, (b3) equating a second random number to the variable parameter, (b4) dividing the first random number by the second random number to generate a quotient, wherein if the quotient is not within the acceptable frequency range then repeating steps (b1)-(b4), otherwise using the quotient as the random frequency signal; (a3) comparing the random frequency signal to the acceptable frequency range, wherein if the random frequency signal is not within the acceptable frequency range, then repeating steps (a1)-(a3), otherwise; (a4) overlaying the random frequency signal onto the prosody modified speech signal; (a5) initializing an overlay timer, the overlay timer being adapted to expire at a predetermined time; (a6) determining if the overlay timer has expired, wherein if the overlay timer has expired then repeating steps (a2)-(a6), otherwise outputting a prosody modified speech signal thereby preventing comprehension of said prosody modified speech signal by a speech recognition system.