FFT-based digital tactile vocoder system for real-time use

Özdamar, Özcan; Lopez, C.; Oller, D. Kimbrough; Eilers, Rebecca E.; Miskiel, Edward; Lynch, Michael P.

doi:10.1007/bf02446132

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…At the present time, the tactual vocoders used in the University's model program are the Tactaid II+ (Franklin, 1989), the Tactaid 7 (Franklin, 1991), and the Digivoc 16 (Ozdamar, Delgado, & Lopez, 1987;Ozdamar et al, 1992). The Tactaid II+, a two channel vibrotactile aid, divides the frequency spectrum into two channels: the lower channel transmits the range 100 Hz to 1.8 kHz, and the upper channel transmits the range 1.5 kHz to 10 kHz (Franklin, 1989).…”

Section: Tactile Devices In the Programmentioning

confidence: 99%

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Training Children to Use Tactual Vocoders in a Model Program

Vergara¹,

Miskiel²,

Oller³

et al. 1995

Semin Hear

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Section: Tactile Devices In the Programmentioning

confidence: 99%

“…The system is also capable of presenting any arbitrary spatiotemporal pattern on the skin for artificial hearing experiments. Research with deaf and normal-hearing subjects suggests that the Digivoc 16 is an effective training and research tool (Ozdamar et al, 1987(Ozdamar et al, , 1992.…”

Section: Tactile Devices In the Programmentioning

confidence: 99%

Training Children to Use Tactual Vocoders in a Model Program

Vergara¹,

Miskiel²,

Oller³

et al. 1995

Semin Hear

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Proposal and evaluation of the sweeping display of speech spectrum for a tactile vocoder used by the profoundly hearing impaired

Wada

Ino

Ifukube

1996

Electron Comm Jpn Pt III

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This paper presents a study for improving the sensory substitution system using the fingertip tactile sensation as an auxiliary meam of lipreading and talking with hands for the severely hearing impaired, for whom the hearing aid or the cochlear implant was not effective. First, the problems of the previously developed 16channel tactile vwoder with a vibrator array are described. It is pointed out that the backward masking of the tactile sensation is one of the factors that made consonants difficult to recognize. Then, as a solution to the problem, a new stimulus presentation method is proposed where the speech spectrum is swept on the finger surface.The optimal sweeping velocity is determined from the viewpoint of the two-point threshold so that the backward masking is minimized. Based on those investigations, an 8 X 4 vibrator matrix is constructed which can sweep the speech spectrum. A recognition experiment is attempted for monosyllabic speech. It is seen as a result that the identification of a consonant that is easily affected by the backward masking, especially plosives are improved. Thus, it is suggested that the sweeping of the spectral pattern is effective as an auxiliary means of speech recognition, even for the profoundly hearing impaired.

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