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:
Jul. 27, 1976
Filed:
Mar. 03, 1975
Wilford R Schreier, Bensenville, IL (US);
Hammond Corporation, Chicago, IL (US);
Abstract
A plural mode envelope generator in which a basic time constant circuit is coupled by selector switches to a plurality of envelope generating means which function under the control of one or both of a keydown detector and a legato pulse generator. Fast attack-short substain and slow attack-long sustain envelope circuits involve standard techniques. A dual mode percussion circuit provides post key release sustain in one mode when the keydown detector is decoupled from the circuit and post key release tone snubbing when the keydown detector is coupled to the circuit. A sostenuto circuit with flip-flop latch includes a reset gate to hold the flip-flop in reset until sostenuto keying is desired whereupon a unidirectional circuit couples the initial keydown signal to the latch to place the flip-flop in a set state but prevents the disappearance of that signal from resetting the latch.