Key data entry system for an electronic musical instrument
Patent 4499807 Issued on February 19, 1985. Estimated Expiration Date: 
July 22, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 22, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesContact bounce transient pulse circuit eliminator Binary word debouncer Contact de-bouncing circuit with common mode rejection Automatic accompaniment apparatus Automatic chord type and root note detector Patent #: 4282786 InventorAssigneeApplicationNo. 06/516421 filed on 07/22/1983US Classes:84/656, Priority or preference circuits84/669ChordsExaminersPrimary: Isen, Forester W.Attorney, Agent or FirmInternational ClassesH03M 11/00 (20060101)H03M 11/20 (20060101) G10H 1/18 (20060101) Foreign Application Priority Data1980-09-05 JPAbstractA key data entry system for an electronic musical instrument comprises a keyboard having a plurality of user operable chord specification keys, a detector for detecting the key operation state of the chord specification keys, a first specifying device for specifying a particular one of the operated chord specification keys and a second specifying device for specifying the number of chord specification keys operated at one time. Further provided is a chord designating device which designates the root note and the kind of a chord to be produced as a function of the particular one of the operated chord specification keys and the number of chord specification keys operated at one time. In one implementation, one type of chord is produced when only one chord specification key is operated, a second type of chord is produced when two of the chord specification keys are operated together and a third type of chord is produced when three or more of the chord specification keys are operated together. | |
