Noise detection for audio encoding by mean and variance energy ratio
First Claim
1. A method for estimating and detecting noise and noise-like spectral signal segments, the signal segments corresponding to one or more frequency bands of a signal, the 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.
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Citations
20 Claims
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1. A method for estimating and detecting noise and noise-like spectral signal segments, the signal segments corresponding to one or more frequency bands of a signal, the 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. A system for estimating and detecting noise and noise-like spectral signal segments, the system comprising:
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a device having a processor and an interface that receives signals; and an encoder that determines noise or noise-like characteristics in frequency bands of the received 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)
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12. A device configured for estimating and detecting noise and noise-like spectral signal segments, the device comprising:
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a memory configured to contain programmed instructions and communication signals; and an encoder that determines noise or noise-like characteristics in frequency bands of the 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 (13, 14, 15)
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16. A computer program product embodied on a computer-readable medium that estimates and detects noise and noise-like spectral signal segments, the signal segments corresponding to one or more frequency bands of a signal, the computer program product comprising:
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computer code to calculate mean and variance energies for each frequency band of a signal; computer code to define boundaries for a ratio of the mean and variance energies in each frequency band of the signal; and computer code to determine 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 (17, 18, 19, 20)
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Specification