Noise Detection for Audio Encoding by Mean and Variance Energy Ratio
First Claim
Patent Images
1. A method, comprising:
- calculating mean and variance energies for each frequency band of a signal;
defining boundaries for a ratio of the mean and variance energies in each frequency band of the signal; and
determining if each frequency band of the signal is noise or noise-like using the defined boundaries and a stage of two or more decisions.
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Abstract
The techniques described are utilized for detection of noise and noise-like segments in audio coding. The techniques can include performing a prediction gain calculation, an energy compaction calculation, and a mean and variation energy calculation. Signal adaptive noise decisions can be made both in time and frequency dimensions. The techniques can be embodied as part of an AAC (advanced audio coding) encoder to detect noise and noise-like spectral bands. This detected information is transmitted in a bitstream using a signaling method defined for a perceptual noise substitution (PNS) encoding tool of the AAC encoder
6 Citations
22 Claims
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1. A method, comprising:
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calculating mean and variance energies for each frequency band of a signal; defining boundaries for a ratio of the mean and variance energies in each frequency band of the signal; and determining if each frequency band of the signal is noise or noise-like using the defined boundaries and a stage of two or more decisions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus, comprising:
an encoder configured to determine noise or noise-like characteristics in frequency bands of signals using boundaries defined from a ratio of mean and variance energies in each frequency band and a stage of two or more decisions. - View Dependent Claims (9, 10, 11, 12)
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13. An apparatus, comprising:
an encoder configured to determine noise or noise-like characteristics in frequency bands of communication signals using boundaries defined from a ratio of mean and variance energies in each frequency band and a stage of two or more decisions. - View Dependent Claims (14, 15, 16, 17)
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18. A computer program product embodied on a computer readable medium that estimates and detects noise and noise-like spectral signal segments, the computer program product comprising:
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code for calculating mean and variance energies for each frequency band of a signal; code for defining boundaries for a ratio of the mean and variance energies in each frequency band of the signal; and code for determining if each frequency band of the signal is noise or noise-like using the defined boundaries and a stage of two or more decisions. - View Dependent Claims (19, 20, 21, 22)
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Specification