Music – Instruments – Automatic
Patent
1996-12-18
1998-05-26
Shoop, Jr., William M.
Music
Instruments
Automatic
84645, G10H 700
Patent
active
057569100
ABSTRACT:
A method and apparatus for actuating solenoids in an electronic player piano where a Musical Instrument Digital Interface (MIDI) velocity value is translated to a solenoid driving signal, a counter is activated by the solenoid driving signal, and a solenoid is energized from the counter according to the solenoid driving signal. A central processing unit (CPU) reads the MIDI data from a digital data storage device, and selects the corresponding solenoid driving parameters from a look-up table stored in read only memory (ROM). The solenoid driving parameters are converted into a pulse width modulation (PWM) waveform by a driving circuit containing counters. The PWM signal is sent to the gate of a field effect transistor (FET) switch connected to the solenoid and the solenoid is energized by the FET according to the PWM signal.
REFERENCES:
patent: 4132141 (1979-01-01), Campbell et al.
patent: 4135428 (1979-01-01), Campbell
patent: 4469000 (1984-09-01), Fujiwara et al.
patent: 4500938 (1985-02-01), Dulin
patent: 5022301 (1991-06-01), Stahnke
patent: 5042353 (1991-08-01), Stanke
patent: 5083491 (1992-01-01), Fields
patent: 5254804 (1993-10-01), Tamaki et al.
patent: 5276270 (1994-01-01), Kondo
patent: 5432295 (1995-07-01), Matsunaga et al.
patent: 5451706 (1995-09-01), Yamamoto et al.
patent: 5530198 (1996-06-01), Ishii
patent: 5621603 (1997-04-01), Adamec et al.
Fields Kyle D.
McLam George E.
Yorba Alana J.
Burgett, Inc.
Donels Jeffrey W.
O'Banion John P.
Shoop Jr. William M.
LandOfFree
Method and apparatus for actuating solenoids in a player piano does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for actuating solenoids in a player piano, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for actuating solenoids in a player piano will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1963342