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US 2019/0198033 A1Published application
Method for estimating noise in an audio signal, noise estimator, audio encoder, audio decoder, and system for transmitting audio signals
AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsBenjamin SCHUBERT, Manuel JANDER, Anthony LOMBARD, Martin DIETZ, Markus MULTRUS
Life of this patent
Estimating the term…
Abstract
A method is described that estimates noise in an audio signal. An energy value for the audio signal is estimated and converted into the logarithmic domain. A noise level for the audio signal is estimated based on the converted energy value.
Claims11
A method for estimating noise in an audio signal, the method comprising:
- determining an energy value for the audio signal;
- converting the energy value into the log 2-domain;
- and
- estimating a noise level for the audio signal based on the converted energy value directly in the log 2-domain,
- wherein the energy value is converted into the log 2-domain as follows:
- E
- n_log
- =
- ⌊
- (
- log
- 2
-
- (
- 1
- +
- E
- n_lin
- )
- )
- ·
- 2
- N
- ⌋
- 2
- N
- └x┘ floor (x),
- En_log energy value of band n in the log 2-domain,
- En_lin energy value of band n in the linear domain,
- N quantization resolution.
27 more elements
A non-transitory digital storage medium having stored thereon a computer program for performing a method for estimating noise in an audio signal, the method comprising:
- determining an energy value for the audio signal;
- converting the energy value into the log 2-domain;
- and
- estimating a noise level for the audio signal based on the converted energy value directly in the log 2-domain,
- wherein the energy value is converted into the log 2-domain as follows:
- E
- n_log
- =
- ⌊
- (
- log
- 2
-
- (
- 1
- +
- E
- n_lin
- )
- )
- ·
- 2
- N
- ⌋
- 2
- N
- └x┘ floor (x),
- En_log energy value of band n in the log 2-domain,
- En_lin energy value of band n in the linear domain,
- N quantization resolution,
- when said computer program is run by a computer.
28 more elements
A noise estimator, comprising:
- a detector configured to determine an energy value for the audio signal;
- a converter configured to convert the energy value into the log 2-domain;
- and
- an estimator configured to estimate a noise level for the audio signal based on the converted energy value directly in the log 2-domain,
- wherein the energy value is converted into the log 2-domain as follows:
- E
- n_log
- =
- ⌊
- (
- log
- 2
-
- (
- 1
- +
- E
- n_lin
- )
- )
- ·
- 2
- N
- ⌋
- 2
- N
- └x┘ floor (x),
- En_log energy value of band n in the log 2-domain,
- En_lin energy value of band n in the linear domain,
- N quantization resolution.
27 more elements
Dependencies are inferred from the claim text.