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US 2020/0234723 A1Published application
Audio signal processing device, audio signal processing method, and audio signal processing program
AssigneeNtt Docomo, Inc.
InventorsKimitaka Tsutsumi, Kei Kikuiri, Atsushi Yamaguchi
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Abstract
An audio signal processing device comprises a discontinuity detector configured to determine an occurrence of a discontinuity from a sudden increase of an amplitude of decoded audio obtained by decoding the first audio packet which is received correctly after an occurrence of a packet loss, and a discontinuity corrector for correcting the discontinuity of the decoded audio.
Claims16
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.
4 more elements
An audio signal processing device comprising:
- an Immittance Spectral Pair/Immittance Spectral Frequency (ISF/LSF) quantizer configured to quantize ISF/LSF parameters;
- an ISF/LSF concealer configured to generate concealment ISF/LSF parameters representative of concealment information about the ISF/LSF parameters;
- a discontinuity detector configured to determine a sudden increase of amplitude of a first audio packet which is received correctly after an occurrence of a packet loss,
- the discontinuity detector being configured to use distances between quantized ISF/LSF parameters obtained by the ISF/LSF quantizer and the concealment ISF/LSF parameters generated by the ISF/LSF concealer to determine the sudden increase of amplitude of the first audio packet;
- and
- an auxiliary information encoder configured to encode auxiliary information for determination of the sudden increase of amplitude of the first audio packet.
3 more elements
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.
3 more elements
An audio signal processing method to be executed by an audio signal processing device, comprising:
- quantizing Immittance Spectral Pair/Immittance Spectral Frequency (ISF/LSF) parameters;
- generating concealment ISF/LSF parameters being representative of concealment information about the ISF/LSF parameters;
- determining a sudden increase of amplitude of decoded audio which occurs in a first audio packet which is received correctly after an occurrence of a packet loss,
- using distances between quantized ISF/LSF parameters and the generated concealment ISF/LSF parameters;
- and
- encoding auxiliary information for determination of the sudden increase of amplitude of decoded audio.
3 more elements
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.
3 more elements
A non-transitory storage medium that stores an audio signal processing program that programs a computer to operate as:
- an Immittance Spectral Pair/Immittance Spectral Frequency (ISF/LSF) quantizer operable to quantize ISF/LSF parameters;
- an ISF/LSF concealer operable to generate concealment ISF/LSF parameters being representative of concealment information about the ISF/LSF parameters;
- a discontinuity detector operable to determine a sudden increase of amplitude which occurs in a first audio packet which is received correctly after an occurrence of a packet loss,
- the discontinuity detector being operable to use distances between quantized ISF/LSF parameters obtained by the ISF/LSF quantizer and the concealment ISF/LSF parameters generated by the ISF/LSF concealer in order to determine the sudden increase of amplitude;
- and
- an auxiliary information encoder operable to encode auxiliary information for determination upon the sudden increase of amplitude.
3 more elements
Dependencies are inferred from the claim text.