Music – Instruments
Patent
1980-05-07
1982-12-14
Truhe, J. V.
Music
Instruments
84115, 84 128, 84462, 84DIG29, 360 4, 360 79, G10F 100
Patent
active
043632556
ABSTRACT:
A process and apparatus are provided for recording electric signals corresponding to piano key operation and for reproducing the piano key operation. The process includes switching a discrete frequency oscillator corresponding to each piano key, algebraically adding the outputs of each oscillator, filtering the algebraic sum of the oscillator outputs through a low pass filter, recording the filtered signal, reproducing said filtered signal through a high pass filter, detecting each frequency in the high pass filtered signal, and energizing an electromechanical device so as to actuate the piano key which had switched the discrete frequency oscillator. The apparatus in the record mode includes an oscillator responsive to each piano key operation for generating a sine wave of a predetermined frequency for each key, a voltage divider circuit for algebraically adding the oscillator signals, a low pass filter for filtering the combined signal to generate a signal in which the energy levels of each of the component signals are equal, and a recorder for preserving the filtered signal. The apparatus in the playback mode includes a high pass filter for reproducing the algebraic sum signal from the recorded signal, a detection stage for detecting the presence of each discrete frequency signal in the algebraic sum signal, and electromagnetic apparatus for manipulating the keys in response to each frequency detected.
REFERENCES:
patent: 3876863 (1975-04-01), Boone
Tremaine, Audio Cyclopedia, 1979, pp. 263, 758, 759.
Isen Forester W.
Sounds Alive System, Inc.
Truhe J. V.
LandOfFree
Piano action magnetic tape recording process and apparatus for p does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Piano action magnetic tape recording process and apparatus for p, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Piano action magnetic tape recording process and apparatus for p will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1197473