Wideband speech and audio coding using gammatone filter banks

Ambikairajah, Eliathamby; Epps, Julien; Lin, Lao-Sheng

doi:10.1109/icassp.2001.941029

Cited by 24 publications

(28 citation statements)

References 9 publications

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“…5 Though the temporal masking effect has been shown under the assumption that both the masker and maskee exist, it can also be applied to peak points in the signal wave form itself without distinguishing a separate masker from the maskee. 6 This is reasonable if we consider the peak point as a masker having a very short duration. It is also possible to induce positive peak points in the wave form of some auditory-filtered signal (bandpassed signal) to lead to a high rate of neuron firings psychoacoustically.…”

Section: Temporal Masking and The Temporal Envelopementioning

confidence: 98%

“…The temporal masking threshold obtained in this way looks similar to the temporal envelope of the corresponding band signal in the high frequency band. 6 Therefore, in the high frequency band, the variation of the fine structure under the fixed temporal envelope cannot be perceptually detected. The effect may not be applied to a lower band signal where the decaying rate of a masking threshold is faster than the fluctuation of the band signal itself.…”

Section: Temporal Masking and The Temporal Envelopementioning

confidence: 99%

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Perceptual relevance of the temporal envelope to the speech signal in the 4–7kHz band

Kim

Choi

Kang

2007

The Journal of the Acoustical Society of America

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The perceptual relevance of adopting the temporal envelope to model the frequency band of 4–7kHz (highband) in wideband speech signal is described in this letter. Based on theoretical work in psychoacoustics, we find out that the temporal envelope can indeed be a perceptual cue for the high-band signal, i.e., a noiseless sound can be obtained if the temporal envelope is roughly preserved. Subjective listening tests verify that transparent quality can be obtained if the model is used for the 4.5–7kHz band. The proposed model has the benefits of offering flexible scalability and reducing the cost for quantization in coding applications.

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Section: Temporal Masking and The Temporal Envelopementioning

confidence: 98%

Section: Temporal Masking and The Temporal Envelopementioning

confidence: 99%

Perceptual relevance of the temporal envelope to the speech signal in the 4–7kHz band

Kim

Choi

Kang

2007

The Journal of the Acoustical Society of America

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show abstract

“…Physically, the half-wave rectification process corresponds to the action of the inner hair cells, which respond to movement of the basilar membrane in one direction only. Peaks correspond to higher rates of neural firing at larger displacements of the inner hair cell from its position at rest [2,3]. This process results in a series of critical band pulse trains, where the pulses retain the amplitudes of the critical band signals from which they were derived.…”

Section: C968mentioning

confidence: 99%

Auditory modelling for speech processing in the perceptual domain

Lin

Ambikairajah²,

Holmes³

2004

ANZIAMJ

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The human hearing system is the most robust speech processor despite noisy environments. This work presents a new computational model for our auditory system by exploring the psychoacoustical masking properties. The model is then applied to speech coding in the perceptual domain. The coding algorithm is capable of producing high quality coded speech and audio, which account for temporal as well as spectral details. The proposed filterbank is also applied to speech denoising in the perceptual domain. The enhanced speech is of good perceptual quality.

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“…Garnmatone filter simulates the motion of the basilar membrane and obtains an auditory-based time-frequency parameterization that comprises critical band pulse trains [7] [8]. This parame terization approximates the patterns of neural firing gener ated by the auditory nerve, and preserves the temporal information present in speech and music.…”

Section: Highband Coding Algorithmmentioning

confidence: 99%

“…In [8J the simul taneous and temporal masking models were used to allow the elimination of redundant information in the critical band pulse trains, and thus increases the feasibility of the parameterization for coding applications. However, the wideband coder implemented in [8] requires high bit rate.…”

Section: Highband Coding Algorithmmentioning

confidence: 99%

A new bandwidth scalable wideband speech/audio coder

Kim

Jung

Park

et al. 2002

IEEE International Conference on Acoustics Speech and Signal Processing

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In this paper, we present a new bandwidth-scalable coder for wide band speech and audio signals. The proposed coder splits 8 kHz signal bandwidth into two narrow bands, and different coding schemes are applied to each band.The lower-band speech is coded with ITU-T G.729 Ann ex E, and the higher-band signal is compressed using a new algorithm based on the gamma tone filter band with an in vertible auditory model. Due to the split-band architecture and completely independent coding schemes for each band, the output speech of the decoder can be selected to be a narr owband or wideband coding according to the chann el conditions. Subjective tests showed that, for wideband speech and audio signals, the proposed coder at 18 kbitls produces superior quality to ITV-T 24 kbitls G.722.1 with the shorter algorithmic delay.

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Wideband speech and audio coding using gammatone filter banks

Cited by 24 publications

References 9 publications

Perceptual relevance of the temporal envelope to the speech signal in the 4–7kHz band

Perceptual relevance of the temporal envelope to the speech signal in the 4–7kHz band

Auditory modelling for speech processing in the perceptual domain

A new bandwidth scalable wideband speech/audio coder

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