Method and device for encoding speech using open-loop pitch analysis

A method for encoding speech, the method comprising:

• sampling a speech signal to generate samples;
• producing spectral representations from the samples;
• interpolating the spectral representations to generate interpolated spectral representations;
• performing open-loop pitch analysis based on the interpolated spectral representation;
• and
• transmitting encoded speech comprising a codebook index.

A method for encoding speech, the method comprising:

• sampling a speech signal to generate samples;
• producing a first set of linear predication (LP) coefficients based on the samples;
• producing spectral representations from the first set of LP coefficients;
• interpolating the spectral representations to generate interpolated spectral representations;
• converting the interpolated spectral representations to a second set of LP coefficients;
• performing open-loop pitch analysis with the second set of LP coefficients;
• and
• transmitting encoded speech comprising a codebook index.

A speech encoder comprising:

• a sampler to generate samples from a speech signal;
• a linear predictive coding (LPC) device to produce spectral representations from the samples;
• an interpolator to interpolate the spectral representations to generate interpolated spectral representations;
• a pitch analyzer to perform open-loop pitch analysis based on the interpolated spectral representations;
• and
• a bit packing device to transmit encoded speech comprising a codebook index.