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:
Oct. 27, 1981
Filed:
Feb. 14, 1980
David R Wade, Cincinnati, OH (US);
Walter Munch, Ft. Thomas, KY (US);
Baldwin Piano & Organ Company, Cincinnati, OH (US);
Abstract
A microprocessor controlled electronic capture combination action system for use in an electronic organ for selecting a predetermined combination of stops to define the organ voicing. The system includes a plurality of stop tabs for setting and resetting the stops, a plurality of pistons for setting a desired combination of stops to a predetermined condition, a random access memory for storing data associated with a selected combination of stops, a read only memory containing a permanently stored operating program incorporating a plurality of operating instructions, an indicator light associated with each of the stop tabs and a microprocessor responsive to the operating instructions. The stop tab and pistons are continually and sequentially scanned to detect the contact closures. Actuated stop tabs cause the associated stops to be selected and the indicator lights illuminated. Information corresponding to a selected combination of stops for a selected one of the pistons is stored in the random access memory and may be recalled at will by closing the appropriate piston. The recalled data is used to select the combination of stops and illuminate the associated indicator lights. The system also includes a manually operable crescendo shoe which may be used to actuate a plurality of predetermined combinations of the stops in response to designated positions of the shoe. In a preferred embodiment, a crescendo circuit is used to cause a delayed interrupt signal to the operating program to provide a count which is compared against stored values associated with particular stop combinations. The crescendo shoe also includes a circuit for adding hysteresis to the crescendo shoe position. The operating program incorporates a debounce routine for eliminating false contact closures caused by switch bounce in the stop tabs such that the switch contacts must remain in a particular state for a number of successive scans before the switch closure will be detected.