Method and system for preventing speech comprehension by interactive voice response systems
First Claim
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.
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Accused Products
Abstract
A method of and system for generating a speech signal with an overlayed random frequency signal using prosody modification of a speech signal output by a text-to-speech (TTS) system to substantially prevent an interactive voice response (IVR) system from understanding the speech signal without significantly degrading the speech signal with respect to human understanding. The present invention involves modifying a prosody of the speech output signal by using a prosody of the user'"'"'s response to a prompt. In addition, a randomly generated overlay frequency is used to modify the speech signal to further prevent the IVR system from recognizing the TTS output. The randomly generated frequency may be periodically changed using an overlay timer that changes the random frequency signal at a predetermined intervals.
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Citations
24 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of modifying a speech signal for reducing the likelihood of recognition of the speech signal by a speech recognition system, the method comprising:
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accessing a text file; utilizing a text-to-speech synthesizer to generate a speech signal from the text file; receiving a prosody sample from a user in response to prompting; and modifying the speech signal with a characteristic of the prosody sample such that an audio output of the modified speech signal is less likely to be understood by a speech recognition system than an audible output of the generated 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. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A system for decreasing the likelihood of recognition of a speech signal by a speech recognition system, the system comprising:
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a receiver for receiving at least one prosody sample; and a speech signal modifier modifying at least one prosody characteristic associated with an initial speech signal in accordance with 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. - View Dependent Claims (23, 24)
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Specification