Browse Prior Art Database

Auditory Feedback of Keyboard Shift Lock

IP.com Disclosure Number: IPCOM000052999D
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Axford, JG: AUTHOR

Abstract

An electronic keyboard for use with a visual display unit is provided with means for producing an audible tone of one pitch when lowercase keys are operated and of a higher pitch when uppercase keys are operated.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Auditory Feedback of Keyboard Shift Lock

An electronic keyboard for use with a visual display unit is provided with means for producing an audible tone of one pitch when lowercase keys are operated and of a higher pitch when uppercase keys are operated.

Present day electronic keyboards are already provided with an electromagnetically operated clicker mechanism which provides auditory feedback to the operator for all keystrokes. Generally, a solenoid is energized by a pulse of current every keystroke and acts on a springy armature or, alternatively, fires a spring-loaded plunger to strike a diaphragm to create a sound indicating a successful keystroke operation. Provision of the tone of higher pitch for uppercase keystrokes may be achieved simply by the addition of a second solenoid which, in the first case, acts on a shorter leaf armature or, in the other case, is effective to distort the diaphragm so that when struck by the plunger a higher tone is produced.

The feature may alternatively be implemented electronically by means of an audio oscillator which emits a short tone burst whenever a key is depressed. The frequency of the tone is raised automatically whenever an uppercase is selected.

1