Determining pitch cycle energy and scaling an excitation signal

An electronic device for scaling an excitation, comprising:

• a processor;
• memory in electronic communication with the processor;
• instructions stored in the memory, the instructions being executable to:
• obtain a synthesized excitation signal, a set of pitch cycle energy parameters and a pitch lag;
• segment the synthesized excitation signal into segments;
• filter each segment to obtain synthesized segments;
• determine scaling factors based on the synthesized segments and the set of pitch cycle energy parameters;
• and
• scale the segments using the scaling factors to obtain scaled segments.

A method for determining a set of pitch cycle energy parameters on an electronic device, comprising:

• obtaining a frame;
• obtaining a set of filter coefficients;
• obtaining a residual signal based on the frame and the set of filter coefficients;
• determining a set of peak locations based on the residual signal;
• segmenting the residual signal such that each segment of the residual signal includes one peak;
• determining a first set of pitch cycle energy parameters based on a frame region between two consecutive peak locations;
• mapping regions between peaks in the residual signal to regions between peaks in a synthesized excitation signal to produce a mapping;
• and
• determining a second set of pitch cycle energy parameters based on the first set of pitch cycle energy parameters and the mapping.

A method for scaling an excitation on an electronic device, comprising:

• obtaining a synthesized excitation signal, a set of pitch cycle energy parameters and a pitch lag;
• segmenting the synthesized excitation signal into segments;
• filtering each segment to obtain synthesized segments;
• determining scaling factors based on the synthesized segments and the set of pitch cycle energy parameters;
• and
• scaling the segments using the scaling factors to obtain scaled segments.

A computer-program product for determining a set of pitch cycle energy parameters, comprising a non-transitory tangible computer-readable medium having instructions thereon, the instructions comprising:

• code for causing an electronic device to obtain a frame;
• code for causing the electronic device to obtain a set of filter coefficients;
• code for causing the electronic device to obtain a residual signal based on the frame and the set of filter coefficients;
• code for causing the electronic device to determine a set of peak locations based on the residual signal;
• code for causing the electronic device to segment the residual signal such that each segment of the residual signal includes one peak;
• code for causing the electronic device to determine a first set of pitch cycle energy parameters based on a frame region between two consecutive peak locations;
• code for causing the electronic device to map regions between peaks in the residual signal to regions between peaks in a synthesized excitation signal to produce a mapping;
• and
• code for causing the electronic device to determine a second set of pitch cycle energy parameters based on the first set of pitch cycle energy parameters and the mapping.

A computer-program product for scaling an excitation, comprising a non-transitory tangible computer-readable medium having instructions thereon, the instructions comprising:

• code for causing an electronic device to obtain a synthesized excitation signal, a set of pitch cycle energy parameters and a pitch lag;
• code for causing the electronic device to segment the synthesized excitation signal into segments;
• code for causing the electronic device to filter each segment to obtain synthesized segments;
• code for causing the electronic device to determine scaling factors based on the synthesized segments and the set of pitch cycle energy parameters;
• and
• code for causing the electronic device to scale the segments using the scaling factors to obtain scaled segments.

An apparatus for determining a set of pitch cycle energy parameters, comprising:

• means for obtaining a frame;
• means for obtaining a set of filter coefficients;
• means for obtaining a residual signal based on the frame and the set of filter coefficients;
• means for determining a set of peak locations based on the residual signal;
• means for segmenting the residual signal such that each segment of the residual signal includes one peak;
• means for determining a first set of pitch cycle energy parameters based on a frame region between two consecutive peak locations;
• means for mapping regions between peaks in the residual signal to regions between peaks in a synthesized excitation signal to produce a mapping;
• and
• means for determining a second set of pitch cycle energy parameters based on the first set of pitch cycle energy parameters and the mapping.

An apparatus for scaling an excitation, comprising:

• means for obtaining a synthesized excitation signal, a set of pitch cycle energy parameters and a pitch lag;
• means for segmenting the synthesized excitation signal into segments;
• means for filtering each segment to obtain synthesized segments;
• means for determining scaling factors based on the synthesized segments and the set of pitch cycle energy parameters;
• and
• means for scaling the segments using the scaling factors to obtain scaled segments.