Key-touch state detection device for an automatic performance pi

Details Key-touch state detection device for an automatic performance pi Key-touch state detection device for an automatic performance pi

1990-07-27

1993-04-06

Shoop, Jr., William M.

Music

Instruments

Electrical musical tone generation

84745, G10H 102

Patent

active

052005704

ABSTRACT:
A key touch state detection device for an automatic performance piano includes at least one sensor for detecting whether or not a position of the hammer striking a string in an interlocked motion with movement of a key coincides with a predetermined hammer stop position and also whether or not a position of the hammer coincides with a predetermined position or positions in the vicinity of the string. The device includes also a circuit responsive to the detection output of the sensor for determining, when the hammer is recognized to be in a return process, a timing at which result of detection of the hammer stop position has changed as a timing of release of key. Depression and release of the key and the string striking speed of the hammer (key-touch strength) are detected by the hammer position sensor with resulting simplification in the structure of the device and improved accuracy in the detection of a key-touch state.

REFERENCES:
patent: 4080863 (1978-03-01), Groeschel
patent: 4592262 (1986-06-01), Yang
patent: 4593592 (1986-06-01), Stahnke
patent: 4736662 (1988-04-01), Yamamoto
patent: 4756223 (1988-07-01), Murakami
patent: 4913026 (1990-04-01), Kaneko et al.
patent: 4970928 (1990-11-01), Tamaki
patent: 4979423 (1990-12-01), Watanabe
patent: 5012715 (1991-05-01), Matsunaga et al.

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