Method for determining the presence of a wanted signal component
First Claim
1. A method for determining, in a speech dialogue system issuing speech prompts, a score value as an indicator for the presence of a wanted signal component in an input signal stemming from a microphone, comprising the steps of:
- using a first likelihood function to determine a first likelihood value for the presence of the wanted signal component in the input signal,using a second likelihood function to determine a second likelihood value for the presence of a noise signal component in the input signal, anddetermining, using a processor, a score value based on the first and the second likelihood values, wherein the first likelihood function is based on a predetermined reference wanted signal, and the second likelihood function is based on a predetermined reference noise signal,wherein the redetermined reference wanted signal is based on a first superposition signal obtained by superimposing at least one model wanted signal on at least one model prompt signal, and the predetermined reference noise signal is based on a second superposition signal obtained by superimposing at least one model noise signal on the at least one model prompt signal.
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Abstract
This invention provides a method for determining, in a speech dialog system issuing speech prompts, a score value as an indicator for the presence of a wanted signal component in an input signal stemming from a microphone, comprising the steps of: using a first likelihood function to determine a first likelihood value for the presence of the wanted signal component in the input signal, using a second likelihood function to determine a second likelihood value for the presence of a noise signal component in the input signal, and determining a score value based on the first and the second likelihood values, wherein the first likelihood function is based on a predetermined reference wanted signal, and the second likelihood function is based on a predetermined reference noise signal.
69 Citations
28 Claims
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1. A method for determining, in a speech dialogue system issuing speech prompts, a score value as an indicator for the presence of a wanted signal component in an input signal stemming from a microphone, comprising the steps of:
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using a first likelihood function to determine a first likelihood value for the presence of the wanted signal component in the input signal, using a second likelihood function to determine a second likelihood value for the presence of a noise signal component in the input signal, and determining, using a processor, a score value based on the first and the second likelihood values, wherein the first likelihood function is based on a predetermined reference wanted signal, and the second likelihood function is based on a predetermined reference noise signal, wherein the redetermined reference wanted signal is based on a first superposition signal obtained by superimposing at least one model wanted signal on at least one model prompt signal, and the predetermined reference noise signal is based on a second superposition signal obtained by superimposing at least one model noise signal on the at least one model prompt signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A computer program product comprising one or more non-transitory computer readable media having computer code stored thereon for producing a score value as an indicator for the presence of a wanted signal component in an input signal stemming from a microphone, the computer code comprising:
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computer code using a first likelihood function to determine a first likelihood value for the presence of the wanted signal component in the input signal, computer code using a second likelihood function to determine a second likelihood value for the presence of a noise signal component in the input signal, and computer code for determining a score value based on the first and the second likelihood values, wherein the first likelihood function is based on a predetermined reference wanted signal, and the second likelihood function is based on a predetermined reference noise signal, wherein the predetermined reference wanted signal is based on a first superposition signal obtained by superimposing at least one model wanted signal on at least one model prompt signal, and the predetermined reference noise signal is based on a second superposition signal obtained by superimposing at least one model noise signal on the at least one model prompt signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An apparatus which is adapted to determine, in a speech dialogue system issuing speech prompts, a score value as an indicator for the presence of a wanted signal component in an input signal stemming from a microphone, comprising the components of:
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means for determining a first likelihood value for the presence of the wanted signal component in the input signal by using a first likelihood function, means for determining a second likelihood value for the presence of a noise signal component in the input signal by using a second likelihood function, and means for determining a score value based on the first and the second likelihood values, wherein the first likelihood function is based on a predetermined reference wanted signal, and the second likelihood function is based on a predetermined reference noise signal, wherein the predetermined reference wanted signal is based on a first superposition signal obtained by superimposing at least one model wanted signal on at least one model prompt signal, and the predetermined reference noise signal is based on a second superposition signal obtained by superimposing at least one model noise signal on the at least one model prompt signal.
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Specification