Electrostatic expression encoding apparatus for percussive keyboard instruments
Patent 4080863 Issued on March 28, 1978. Estimated Expiration Date: 
March 28, 1995. 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.
March 28, 1995. 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 References 1318977 3328507 3375320 3514522 3657459 Electronic musical instrument effects control Patent #: 3965789 InventorApplicationNo. 05/736254 filed on 10/27/1976US Classes:84/658, Force or velocity responsive84/665Loudness controlExaminersPrimary: Schaefer, Robert K.Assistant: Miska, Vit W. Attorney, Agent or FirmAbstractA 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. | |
