Audio signal discontinuity processing system

An audio signal processing device comprising:

• a discontinuity detector configured to determine a sudden increase of amplitude of decoded audio, wherein the discontinuity detector is configured to use a power of an excitation signal to determine the sudden increase of amplitude of the decoded audio,
• the decoded audio being obtained by decoding
• a first audio packet that is received correctly after an occurrence of a packet loss, and
• the sudden increase of amplitude occurring in the first decoded audio packet received correctly after packet loss;
• and
• a discontinuity corrector configured to correct the sudden increase of amplitude of the decoded audio;
• wherein the discontinuity corrector is configured to change, according to a result of determination of the sudden increase of amplitude of the decoded audio, a distance between elements of Immittance Spectral Pair/Immittance Spectral Frequency (ISF/LSF) parameters of a past frame stored in an internal state buffer so that the distances are wider.

An audio signal processing device comprising:

• a discontinuity detector configured to determine a sudden increase of amplitude of decoded audio, wherein the discontinuity detector is configured to use quantized codebook gains used for calculation of an excitation signal to determine the sudden increase of amplitude of the decoded audio,
• the decoded audio being obtained by decoding
• a first audio packet that is received correctly after an occurrence of a packet loss, and
• the sudden increase of amplitude occurring in the first decoded audio packet received correctly after packet loss;
• and
• a discontinuity corrector configured to correct the sudden increase of amplitude of the decoded audio;
• wherein the discontinuity corrector is configured to change, according to a result of determination of the sudden increase of amplitude of the decoded audio, a distance between elements of Immittance Spectral Pair/Immittance Spectral Frequency (ISF/LSF) parameters of a past frame stored in an internal state buffer so that the distances are wider.

An audio signal processing device comprising:

• a discontinuity detector configured to determine a sudden increase of amplitude of decoded audio,
• the decoded audio being obtained by decoding
• a first audio packet that is received correctly after an occurrence of a packet loss, and
• the sudden increase of amplitude occurring in the first decoded audio packet received correctly after packet loss;
• and
• a discontinuity corrector configured to correct the sudden increase of amplitude of the decoded audio;
• wherein the discontinuity corrector is configured to change, according to a result of determination of the sudden increase of amplitude of the decoded audio, a distance between elements of Immittance Spectral Pair/Immittance Spectral Frequency (ISF/LSF) parameters of a past frame stored in an internal state buffer so that the distances are wider,
• wherein the discontinuity corrector is configured to correct ISF/LSF parameters according to a result of the determination of the sudden increase of amplitude made by the discontinuity detector.

A non-transitory storage medium that stores an audio signal processing program that programs a computer to operate as:

• a discontinuity detector operable to determine a sudden increase of an amplitude of a decoded audio,
• the decoded audio being obtained by decoding a first audio packet which is received correctly after an occurrence of a packet loss, and
• the sudden increase of amplitude occurring in the first decoded audio packet received correctly after packet loss;
• and
• a discontinuity corrector operable to correct the sudden increase of amplitude of the decoded audio;
• wherein the discontinuity corrector is configured to change, according to a result of determination of a sudden increase of amplitude of the decoded audio, a distance between elements of Immittance Spectral Pair/Immittance Spectral Frequency (ISF/LSF) parameters of a past frame stored in an internal state buffer so that the distances are wider.

An audio signal processing method to be executed by an audio signal processing device, comprising:

• determining a sudden increase of an amplitude of decoded audio,
• the decoded audio being obtained by decoding a first audio packet which is received correctly after an occurrence of a packet loss, and
• the sudden increase of amplitude occurring in the first decoded audio packet received correctly after packet loss;
• and
• correcting the sudden increase of amplitude of the decoded audio;
• wherein correcting the sudden increase of amplitude of the decoded audio comprises changing, according to a result of determination on the sudden increase of amplitude of the decoded audio, a distance between elements of Immittance Spectral Pair/Immittance Spectral Frequency (ISF/LSF) parameters of a past frame stored in an internal state buffer so that the distances are wider.