Systems and methods for quantizing and dequantizing phase information

An electronic device for quantizing phase information, comprising:

• prototype pitch period extraction circuitry that determines a prototype pitch period signal based on a speech signal;
• frequency domain transform circuitry coupled to the prototype pitch period extraction circuitry, wherein the frequency domain transform circuitry transforms the prototype pitch period signal into a first frequency-domain signal;
• amplitude transform circuitry coupled to the frequency domain transform circuitry, wherein the amplitude transform circuitry maps the first frequency-domain signal into a plurality of subbands;
• global alignment search circuitry coupled to the frequency domain transform circuitry, wherein the global alignment search circuitry determines a global alignment based on the first frequency-domain signal;
• band alignment search circuitry coupled to the global alignment search circuitry, wherein the band alignment search circuitry determines a plurality of band alignments corresponding to the plurality of subbands;
• global alignment quantizer circuitry coupled to the global alignment search circuitry, wherein the global alignment quantizer circuitry quantizes the global alignment utilizing scalar quantization to obtain a quantized global alignment;
• band alignments quantizer circuitry coupled to the band alignment search circuitry, wherein the band alignments quantizer circuitry quantizes the plurality of band alignments utilizing vector quantization to obtain a quantized plurality of band alignments;
• and
• transmitter circuitry that transmits the quantized global alignment and the quantized plurality of band alignments.

A computer-program product for quantizing phase information, comprising a non-transitory tangible computer-readable medium having instructions thereon, the instructions comprising:

• code for causing an electronic device to obtain a speech signal;
• code for causing the electronic device to determine a prototype pitch period signal based on the speech signal;
• code for causing the electronic device to transform the prototype pitch period signal into a first frequency-domain signal;
• code for causing the electronic device to map the first frequency-domain signal into a plurality of subbands;
• code for causing the electronic device to determine a global alignment based on the first frequency-domain signal;
• code for causing the electronic device to quantize the global alignment utilizing scalar quantization to obtain a quantized global alignment;
• code for causing the electronic device to determine a plurality of band alignments corresponding to the plurality of subbands;
• code for causing the electronic device to quantize the plurality of band alignments utilizing vector quantization to obtain a quantized plurality of band alignments;
• and
• code for causing the electronic device to transmit the quantized global alignment and the quantized plurality of band alignments.

An apparatus for quantizing phase information, comprising:

• means for obtaining a speech signal;
• means for determining a prototype pitch period signal based on the speech signal;
• means for transforming the prototype pitch period signal into a first frequency-domain signal;
• means for mapping the first frequency-domain signal into a plurality of subbands;
• means for determining a global alignment based on the first frequency-domain signal;
• means for quantizing the global alignment utilizing scalar quantization to obtain a quantized global alignment;
• means for determining a plurality of band alignments corresponding to the plurality of subbands;
• means for quantizing the plurality of band alignments utilizing vector quantization to obtain a quantized plurality of band alignments;
• and
• means for transmitting the quantized global alignment and the quantized plurality of band alignments.