# US 10,373,621 B2 · Audio decoder and method for providing a decoded audio information using an error concealment based on a time domain excitation signal

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- Number: US 10,373,621 B2
- Document ID: US10373621B2
- Status: Granted
- Kind: B2
- Application number: 15/261,517
- Filed: 2016-09-09
- Published: 2016-12-29
- Granted: 2019-08-06
- Earliest claimed: 2013-10-31
- Assignees: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
- Applicants: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
- Inventors: Jérémie Lecomte; Goran Markovic; Michael Schnabel; Grzegorz Pietrzyk
- Web page: https://patentgrep.com/patent/US10373621B2

## CPC

- G10L 19/005: Correction of errors induced by the transmission channel, if related to the coding algorithm
- G10L 19/02: using spectral analysis, e.g. transform vocoders or subband vocoders
- G10L 19/09: Long term prediction, i.e. removing periodical redundancies, e.g. by using adaptive codebook or pitch predictor
- G10L 19/125: Pitch excitation, e.g. pitch synchronous innovation CELP [PSI-CELP]
- G10L 19/08: Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
- G10L 2019/0011: {Long term prediction filters, i.e. pitch estimation}
- G10L: SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING

## Abstract

An audio decoder for providing a decoded audio information on the basis of an encoded audio information includes an error concealment configured to provide an error concealment audio information for concealing a loss of an audio frame following an audio frame encoded in a frequency domain representation using a time domain excitation signal.

## Claims

### Claim 1

An audio decoder for providing a decoded audio information on the basis of an encoded audio information, the audio decoder comprising:
an error concealment unit configured to provide an error concealment audio information for concealing a loss of an audio frame following an audio frame encoded in a frequency domain representation using a time domain excitation signal;
wherein the error concealment unit is configured to modify a time domain excitation signal acquired on the basis of one or more audio frames preceding a lost audio frame, in order to acquire the error concealment audio information;
wherein the error concealment unit is configured to time-scale the time domain excitation signal acquired on the basis of one or more audio frames preceding a lost audio frame, or the one or more copies thereof, in dependence on a prediction of a pitch for the time of the one or more lost audio frames.

### Claim 2

A method for providing a decoded audio information on the basis of an encoded audio information, the method comprising:
providing an error concealment audio information for concealing a loss of an audio frame following an audio frame encoded in a frequency domain representation using a time domain excitation signal;
wherein a time domain excitation signal acquired on the basis of one or more audio frames preceding a lost audio frame is modified, in order to acquire the error concealment audio information;
wherein the time domain excitation signal acquired on the basis of one or more audio frames preceding a lost audio frame, or the one or more copies thereof, is time-scaled in dependence on a prediction of a pitch for the time of the one or more lost audio frames.

### Claim 3 (depends on 2)

A non-transitory digital storage medium having a computer program stored thereon to perform the method according to claim 2 when said computer program is run by a computer.

### Claim 4

An audio decoder for providing a decoded audio information on the basis of an encoded audio information, the audio decoder comprising:
a spectral value decoding unit to provide decoded spectral values, which are used for a provision of a time-domain representation, on the basis of encoded spectral values; and
an error concealment unit configured to provide an error concealment audio information for concealing a loss of an audio frame following an audio frame encoded in a frequency domain representation which comprises the encoded spectral values using a time domain excitation signal;
wherein the error concealment unit is configured to modify a time domain excitation signal acquired on the basis of one or more audio frames preceding a lost audio frame, in order to acquire the error concealment audio information;
wherein the error concealment unit is configured to time-scale the time domain excitation signal acquired on the basis of one or more audio frames preceding a lost audio frame, or the one or more copies thereof, in dependence on a prediction of a pitch for the time of the one or more lost audio frames.