Method and device for presenting information to deaf persons

Details Method and device for presenting information to deaf persons Method and device for presenting information to deaf persons

1976-07-22

1977-05-24

Stellar, George G.

H04R 2500

Patent

active

040257320

ABSTRACT:
In a device for presenting information to deaf persons an electroacoustic signal from a microphone is supplied to a high-pass and to a low-pass channel via an amplifier. The relation between the envelope potentials of the high-passed and the low-passed signals is sensed by means of logarithmic circuits and a differential amplifier, the output potential of which determines the frequency of a voltage controlled oscillator. By means of a dynamic-adapting signal, derived from the electroacoustic signal, an amplitude modulation of the oscillator output is provided. The accordingly obtained amplitude modulated signal is used to drive tactile or auditive transducers.

REFERENCES:
"The Intelligibility of Speech Transposed Downward in Frequency by One Octave", I.B. Thomas et al., Journal of the Audio Engineering Society, Feb. 1970, vol. 18, No. 1, pp. 56-61.

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