US 6,633,839 B2 · Method and apparatus for speech reconstruction in a distributed speech recognition system

Abstract

In a distributed speech recognition system comprising a first communication device which receives a speech input (34), encodes data representative of the speech input, and transmits the encoded data and a second remotely-located communication device which receives the encoded data and compares the encoded data with a known data set, the device including a processor with a program which controls the processor to operate according to a method of reconstructing the speech input including the step of receiving encoded data including encoded spectral data and encoded energy data. The method further includes the step of decoding the encoded spectral data and encoded energy data to determine the spectral data and energy data. The method also includes the step of combining the spectral data and energy data to reconstruct the speech input.

Claims22

Dependent claims

In a distributed speech recognition system comprising a first communication device which receives a speech input and a second communication device remotely located from the first communication device and communicatively coupled to the first communication device, a method of reconstructing the speech input at the second communication device comprising the steps of:

receiving at the second communication device of the distributed speech recognition system encoded data sent by the first communication device of the distributed speech recognition system, the encoded data including encoded spectral data and encoded energy data;
selectively at the second communication device decoding the encoded spectral data and encoded energy data to determine the spectral data and energy data and extracting a speech recognition parameter from the encoded data;
and
selectively combining the spectral data and energy data to reconstruct the speech input at the second communication device and matching the speech recognition parameter with a speech recognition data set.

1 more element

In a distributed speech recognition system comprising a first communication device which receives a speech input, encodes data representative of the speech input, and transmits the encoded data and a second remotely-located communication device which receives the encoded data and compares the encoded data with a known data set, a method of reconstructing the speech input at the second communication device comprising the steps of:

receiving encoded data including encoded spectral data spectral data encoded as a series of mel-frequency cepstral coefficients and encoded energy data;
performing an inverse discrete cosine transform on the mel-frequency cepstral coefficients at harmonic mel-frequencies corresponding to a pitch period of the speech input to determine log-spectral magnitudes of the speech input at the mel-harmonic frequencies;
and
exponentiating the log-spectral magnitudes to determine the spectral magnitudes of the speech input;
decoding the encoded energy data to determine the energy data;
and
combining the spectral magnitudes and the energy data to reconstruct the speech input.

4 more elements

In a distributed speech recognition system comprising a first communication device which receives a speech input, encodes data about the speech input, and transmits the encoded data and a second remotely-located communication device which receives the encoded data and compares the encoded data with a known data set, the second remotely-located communication device comprising:

a processor including a program which controls the processor (i) to receive the encoded data including encoded spectral data spectral data encoded as a series of mel-frequency cepstral coefficients and encoded energy data, (ii) to perform an inverse discrete cosine transform on the mel-frequency cepstral coefficients at harmonic mel-frequencies corresponding to a pitch period of the speech input to determine log-spectral magnitudes of the speech input at the harmonic frequencies, (iii) to exponentiate the log-spectral magnitudes to determine the spectral magnitudes of the speech input, and (iv) to decode the encoded energy data to determine the energy data;
and
a speech synthesizer which combines the spectral magnitudes and the energy data to reconstruct the speech input.

Dependencies are inferred from the claim text.

Method and apparatus for speech reconstruction in a distributed speech recognition system

Life of this patent

Method and apparatus for speech reconstruction in a distributed speech recognition system

Life of this patent

Abstract

Claims22