HARMONICITY-DEPENDENT CONTROLLING OF A HARMONIC FILTER TOOL
First Claim
1. An apparatus for performing a harmonicity-dependent controlling of a harmonic filter tool of an audio codec, comprisinga harmonicity measurer configured to determine a measure of harmonicity of the audio signal,a temporal structure analyzer configured to determine, depending on the pitch, at least one temporal structure measure measuring a characteristic of a temporal structure of the audio signal;
- a controller configured to control the harmonic filter tool depending on the temporal structure measure and the measure of harmonicity.
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Abstract
The coding efficiency of an audio codec using a controllable—switchable or even adjustable—harmonic filter tool is improved by performing the harmonicity-dependent controlling of this tool using a temporal structure measure in addition to a measure of harmonicity in order to control the harmonic filter tool. In particular, the temporal structure of the audio signal is evaluated in a manner which depends on the pitch. This enables to achieve a situation-adapted control of the harmonic filter tool so that in situations where a control made solely based on the measure of harmonicity would decide against or reduce the usage of this tool, although using the harmonic filter tool would, in that situation, increase the coding efficiency, the harmonic filter tool is applied, while in other situations where the harmonic filter tool may be inefficient or even destructive, the control reduces the appliance of the harmonic filter tool appropriately.
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Citations
27 Claims
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1. An apparatus for performing a harmonicity-dependent controlling of a harmonic filter tool of an audio codec, comprising
a harmonicity measurer configured to determine a measure of harmonicity of the audio signal, a temporal structure analyzer configured to determine, depending on the pitch, at least one temporal structure measure measuring a characteristic of a temporal structure of the audio signal; a controller configured to control the harmonic filter tool depending on the temporal structure measure and the measure of harmonicity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for performing a harmonicity-dependent controlling of a harmonic filter tool of an audio codec, comprising
determining a measure of harmonicity of the audio signal; -
determining, depending on the pitch, at least one temporal structure measure measuring a characteristic of a temporal structure of the audio signal; controlling the harmonic filter tool depending on the temporal structure measure and the measure of harmonicity.
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27. A non-transitory digital storage medium having a computer program stored thereon to perform a method for performing a harmonicity-dependent controlling of a harmonic filter tool of an audio codec, the method comprising:
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determining a measure of harmonicity of the audio signal; determining, depending on the pitch, at least one temporal structure measure measuring a characteristic of a temporal structure of the audio signal; controlling the harmonic filter tool depending on the temporal structure measure and the measure of harmonicity; when said computer program is run by a computer.
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Specification