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Browse Prior Art Database

Electronic Keyboard

IP.com Disclosure Number: IPCOM000088476D
Original Publication Date: 1977-Jun-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Lisk, RR: AUTHOR

Abstract

An electronic keyboard employs a plurality of key buttons each of which generates a wave which is sensed by each of three sensors. The phase of the sensed wave at each sensor station is compared by logic to indicate the depressed key button.

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Electronic Keyboard

An electronic keyboard employs a plurality of key buttons each of which generates a wave which is sensed by each of three sensors. The phase of the sensed wave at each sensor station is compared by logic to indicate the depressed key button.

With reference to Fig. 1, key button 11 generates an acoustical wave through clicker mechanism 13. It is noted that a spark-gap generator or any form of mechanical wave effecting mechanism may be utilized. The generated sound wave is acoustically sensed by three sensors 15, 17 and 19 which provide an electrical signal to the logic unit 21 of Fig. 2. The phase relationship of the sensed signals with respect to one another is unique for each key button on the keyboard.

Accordingly, the logic unit detects the depressed key button by processing the phase relationship. The keyboard thus eliminates the need for a transducer at each key button location.

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