The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 1978
Filed:
Oct. 27, 1976
Charles R Groeschel, Houston, TX (US);
Other;
Abstract
A device for encoding the expression of a keyboard percussive instrument is disclosed. The apparatus places a suitable AC voltage on a coating applied to a hammer and positions a pair of capacitive coupled pads near the string to be struck by the hammer. As the hammer sweeps past the pads, signals are capacitively coupled from the hammer motion to the pads. Suitable latches are set and unset to form a signal which is coupled through a switch, a sample and hold amplifier, then to an analog to digital convertor which forms an expressive signal of N bits length. The signal is begun by depression of the key and is terminated by closure of the key upon release by the musician, the key of the instrument being provided with capacitive pickup pads coupled to the key and through a reset gate to the latches. Alternate embodiments are additionally disclosed.