Performance state detecting unit of player piano system

Details Performance state detecting unit of player piano system Performance state detecting unit of player piano system

1991-10-03

1992-11-17

Shoop, Jr., William M.

Music

Instruments

Electrical musical tone generation

84724, 84745, 84 21, G10H 132

Patent

active

051645327

ABSTRACT:
The player piano provides a string-striking mechanism including a hammer driven by corresponding one of eighty-eight keys, and a photo sensor is provided in the vicinity of and also positioned to face with the predetermined member of this string-striking mechanism to be rotated responsive to a key-depression. This photo sensor outputs a signal which is varied in response to a distance of the predetermined member therefrom, so that the output thereof may have a peak value. Based on the peak value, first and second output values are respectively calculated, wherein these values corresponding to the predetermined two measuring points arranged between the photo sensor and the predetermined member are outputted from the photo sensor before and after the peak value respectively. On the basis of the distance between two measuring points and passing time to be passed when the sensor output is varied from the first output value to the second output value, a string-striking velocity of said string-striking mechanism representing a performance state of the play piano is to be computed. Thus, fixation and adjustment of the sensor can be made easily, thereby the string-striking velocity of the hammer can be sensed accurately.

REFERENCES:
patent: 3513247 (1970-05-01), Anderson et al.
patent: 3558793 (1971-01-01), Nakada et al.
patent: 4080863 (1978-03-01), Groeschel
patent: 4351221 (1982-09-01), Starnes et al.
patent: 4790230 (1988-12-01), Sanderson
patent: 4815353 (1989-03-01), Christian
patent: 5012715 (1991-05-01), Matsunaga et al.
"Panasonic Electric Components"-pp. 358-361 Mar. 28, 1990.
"Semiconductor Data Book" by Sharp-pp. 788-789 & 792-793 Oct. 1989.

Affiliated with

Also associated with

Rating

Performance state detecting unit of player piano system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Performance state detecting unit of player piano system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Performance state detecting unit of player piano system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1173320