A PC-Based Multi-resolution Spectrograph

Thomas, T.G.; Pandey, Prem C.; Agashe, S.D.

doi:10.1080/03772063.1994.11437177

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…The input and processed speech signal with the said scheme was presented to two ears through DAC, smoothing filter and power amplifier. Both the signals were spectrographically (5,6) analyzed in order to verify the signal processing. Ten hearing impaired subjects in the age group of 18 to 58 years participated in the experiments.…”

Section: Methodsmentioning

confidence: 99%

Dichotic presentation of speech signal using a critical filter bank for bilateral sensorineural hearing impairment

Chaudhari

Pandey

1998

The Journal of the Acoustical Society of America

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Sensorineural hearing impaired listeners face a particular problem in view of decrease in frequency resolving capacity of ear due to spread of spectral masking along the cochlear partition. Filtering speech signal by bank of critical band filters and adding signals from alternate bands for presenting to the two ears, is likely to reduce this effect, and thus may help in improving the speech intelligibility. We have implemented this processing scheme with eighteen critical bands for experimental evaluation. Listening tests were carried out using twelve vowelconsonant-vowel and consonant-vowel nonsense syllables presented in quiet, on ten subjects with mild-to-very severe sensorineural hearing loss. The stimulus response confusion matrices were analyzed for obtaining recognition scores and information transmission. The relative improvement in recognition scores is up to 25 percent. Information transmission analysis indicated that the overall improvement is contributed by improvements in transmission of place and manner features. The mean response time has also been found to significantly decrease.

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Section: Methodsmentioning

confidence: 99%

Dichotic presentation of speech signal using a critical filter bank for bilateral sensorineural hearing impairment

Chaudhari

Pandey

1998

The Journal of the Acoustical Society of America

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“…La combinación queda: Presenta un ejemplo con la frase: "These shoes were black and brown", pero en nuestra opinión produce una mejora escasa; Y. SHIN [Shi97] por su parte también opina que los resultados no son satisfactorios. T. G. THOMAS [Tho94] no aporta nada nuevo a la idea de S. CHEUNG, plantea calcular un espectro combinado con la misma formulación.…”

Section: Realzamiento Del Espectrogramaunclassified

Metodología para la visualización de los formantes, basada en la transformada de Fourier, y su uso en el estudio espectral de la fonética acústica española

Bermúdez¹

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Esta Tesis Doctoral muestra que es necesario utilizar ventanas temporales relativamente pequeñas para obtener el espectro de la voz. Esto provoca que el espectro calculado sea el resultado de dos señales conjuntas: señal de voz y ventana temporal.La hipótesis en la que se basa esta tesis es que mediante el análisis de las funciones Evolución se puede establecer un método para eliminar parte de la energía del espectro que proviene de la utilización de ventanas temporales. Las funciones Evolución han sido desarrolladas en este trabajo y son innovadoras, ya que no se ha encontrado ninguna documentación que las haga referencia.El estudio de las funciones Evolución se desarrolla a través de tres etapas. En una primera etapa se realiza un análisis en variable continua estableciendo los fundamentos matemáticos en que se basa el método de eliminación de energía sobrante del espectro.En una segunda etapa se estudia mediante la variable discreta en donde se desarrollan las bases del método. Por último, las funciones Evolución se estudian mediante la utilización de muestras de voz para ajustar los diferentes parámetros que intervienen en el método.Una vez finalizada las investigaciones, ha quedado validada la hipótesis inicial, ya que se ha desarrollado con éxito el método buscado. Como demostración de la eficacia del mismo, se aportan en esta tesis los espectros de un conjunto de alófonos representativos de los fonemas del castellano.Finalmente, se plantea un algoritmo propio para la extracción automática de formantes teniendo en cuenta las características especiales que poseen los espectros aquí presentados. Este algoritmo destaca por extraer todos aquellos formantes que encuentra, sin limitarse a los n primeros.

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Dichotic presentation of speech signal with critical band filtering for improving speech perception

Chaudhari

Pandey

Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP '98 (Cat. No.98CH36181

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Reduction in tlequency resolving capacity of the auditory system due to spread of masking of frequency cornponents by neighboring frequency components degrades speech perception in cases of sensorineural hearing impairment. We have carried out experimental evaluation of splitting speech into two signals lby using a bank of critical band filters, in order to reduce the effect of spectral masking in the cochlea. The dichotically presented signals are perceptually integrated in the auditory cortex. Listening tests were carried out with vowel-consonantvowel and consonant-vowel syllables for twelve English consonants on five normal hearing subjects with simulai ion of sensorineural impairment done by adding white masking noise to the speech signal at various S". Significant improvements in recognition score were obtained under adverse listening conditian. Improvement in the reception of speech feature of voicing, place, and manner was observed in information transmission analysis.

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A PC-Based Multi-resolution Spectrograph

Cited by 3 publications

References 6 publications

Dichotic presentation of speech signal using a critical filter bank for bilateral sensorineural hearing impairment

Dichotic presentation of speech signal using a critical filter bank for bilateral sensorineural hearing impairment

Metodología para la visualización de los formantes, basada en la transformada de Fourier, y su uso en el estudio espectral de la fonética acústica española

Dichotic presentation of speech signal with critical band filtering for improving speech perception

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