Education and demonstration – Communication aids for the handicapped – Tactile reading aid
Patent
1979-06-13
1981-02-17
Grieb, William H.
Education and demonstration
Communication aids for the handicapped
Tactile reading aid
340407, G09B 2100
Patent
active
042506379
ABSTRACT:
A speech signal is input to a microphone (10) and applied through a signal compressor (14) to a filter array (18) consisting of a high pass channel (20), a midfrequency channel (22) and a low pass channel (24). The outputs of the filter array (18) are precision rectified in rectifiers (28), (36) and (46). The rectified signals are applied to voltage controlled power drivers (54) and (56), where the output of the midfrequency channel (22) and the low frequency channel (24) are applied to the power driver (54) and the output of the high frequency channel (20) and the low frequency channel (24) are applied to the power driver (56). The power driver (54) drives vibrators (58) and (60) and the output of the power driver (56) drives a vibrator (62). To drive the vibrators (58) and (60), a random frequency signal at the output of a one shot multivibrator (38) is amplitude modulated by the output of the midfrequency channel (22). To drive the vibrator (62) the same random frequency signal is amplitude modulated by the output of the high pass channel (20).
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"A New Way of Hearing," Washington Star, Mar. 20, 1972.
Grieb William H.
Scott Instruments Company
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