An auditory model that explains masking by Schroeder-phase complexes.

Nishimura, Akira

doi:10.1250/ast.22.439

Cited by 1 publication

(7 citation statements)

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“…The peripheral auditory model previously proposed by the author [5] was revised to provide better agreement with the MPP data of the Schroeder-phase masker as well as reasonable frequency selectivity. The power spectrum model of masking was used to account for frequency selectivity.…”

Section: Model Simulationmentioning

confidence: 99%

“…Fitting procedures were conducted for each subject and for the mean data of all four subjects. Parameter fittings using the analytic gammachirp filter for the auditory model and the power spectrum model of masking were also conducted to compare the quality of fit between the proposed model and previous model [5]. In this case, the gammachirp filter was implemented using an impulse response expressed by Eq.…”

Section: Fitting the Model Parameters To The Maskingmentioning

confidence: 99%

“…The previous study by the author [5] estimated parameter values of the analytic gammachirp filter using phase-dependent masking data [1,2,4]. However, since there was no constraint on frequency selectivity, the amplitude response of the estimated gammachirp filter was quite asymmetric compared to the auditory filter shape obtained with the notched-noise method [18].…”

Section: Accounting For the Frequency Selectivity Andmentioning

confidence: 99%

“…However, masked thresholds of a pure tone with frequency and phase identical to a component of the Schroeder-phase masker vary by approximately 20 dB between POS and NEG maskers [1,2]. Several studies [1][2][3][4][5] have reported that these masking differences are due to phase characteristics of the auditory filter. It has been reported that negative curvature of the auditory filter phase characteristics, that is, an upward frequency glide in the impulse response, creates pronounced peaks and dips in the POS waveform envelope.…”

Section: Introductionmentioning

confidence: 99%

“…The author [5] has proposed a peripheral auditory model that adopts the analytic gammachirp filter [11] as an auditory filterbank. This model was able to simulate the difference in masked threshold between POS and NEG observed in previous studies [1,2,4].…”

Section: Introductionmentioning

confidence: 99%

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An auditory model that can account for frequency selectivity and phase effects on masking

Nishimura

2004

Acoust. Sci. & Tech.

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A peripheral auditory model that accounts for masking by the positive and negative Schroeder-phase complex maskers was proposed. In addition, the proposed model provides reasonable frequency selectivity whereas the previous model using the analytic gammachirp filter did not. The proposed model is a cascade of a fixed filter for outer/middle ear response, a compressive gammachirp filterbank for auditory filters, a half-wave rectifier, a direct current component adder, a leaky integrator, and a detection module. Masking data of a short signal by the Schroeder-phase complex masker and notched-noise masking data were collected from the same human listeners to measure phase characteristics and frequency selectivity of the auditory periphery. The peripheral auditory model was used to simulate masking of a short signal, and the power spectrum model of masking was used to simulate the notched-noise masking data. Parameter fittings of both models were conducted simultaneously using the same parameter values of the compressive gammachirp filter for the individual and mean data. The results of model parameter fitting for both models provide a good explanation for human masking data.

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Section: Model Simulationmentioning

confidence: 99%

Section: Fitting the Model Parameters To The Maskingmentioning

confidence: 99%