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US 5,824,930 AGranted
Keyboard musical instrument having key monitor exactly discriminating key motion
AssigneeYamaha Corporation
InventorsTomoyuki Ura, Tsutomu Sasaki
Life of this patent
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Abstract
A keyboard musical instrument continuously monitors a key motion, and determines present key state on the basis of the previous key state, the present key position and a lapse of time during the previous key state so as to exactly control a tone generation.
Claims11
A keyboard musical instrument for generating sounds, comprising:
- a keyboard including a plurality of keys each reciprocally moved between a rest position and an end position;
- a sound generating means responsive to a first piece of control information for starting to generate a sound specified by each of said plurality of keys on the way toward said end position and a second piece of control information for terminating said sound on the way toward said rest position;
- a plurality of key sensors respectively monitoring said plurality of keys for generating key position signals respectively representative of motions of associated keys, each of said key position signals continuously varying a value along a trajectory of one of said plurality of keys having a plurality of reference points bounding sections of said trajectory;
- and
- a sound controlling means connected to said plurality of key sensors, and controlling said sound generating means, said sound controlling means including
- a discriminating sub-means periodically comparing said value of said each of said plurality of key position signals with respective thresholds of said plurality of reference points for determining one of said sections where said each of said plurality of keys is moved,
- a key-state determining sub-means for determining a present key state of said each of said plurality of keys on the basis of said one of said sections and a previous key state which was previously determined by said discriminating sub-means, and
- a control information generating sub-means for generating a first piece of control information indicative of a generation of sound for said each of said plurality of keys after said present key state is representative of a ready for tone generation, said control information generating sub-means further generating a second piece of control information indicative of a termination of sound for said each of said plurality of keys when the value of said each of said plurality of key position signals is matched with one of said thresholds after entry into said ready for tone generation.
5 more elements
A keyboard musical instrument for generating sounds, comprising:
- a keyboard including a plurality of keys each reciprocally moved between a rest position and an end position;
- a sound generating means responsive to a first piece of control information for starting to generate a sound specified by each of said plurality of keys on the way toward said end position and a second piece of control information for terminating said sound on the way toward said rest position;
- a plurality of key sensors respectively monitoring said plurality of keys for generating analog key position signals respectively representative of motions of associated keys, each of said key position signals continuously varying a value along a trajectory of one of said plurality of keys having a plurality of reference points bounding sections of said trajectory;
- and
- a sound controlling means connected to said plurality of key sensors, and controlling said sound generating means, said sound controlling means including
- a discriminating sub-means periodically comparing said value of said each of said plurality of key position signals with respective thresholds of said plurality of reference points for determining one of said sections where said each of said plurality of keys is moved,
- a key-state determining sub-means for determining a present key state of said each of said plurality of keys on the basis of said one of said sections and a previous key state which was previously determined by said discriminating sub-means, and
- a control information generating sub-means for generating a first piece of control information indicative of a generation of sound for said each of said plurality of keys after said present key state is representative of a ready for tone generation, said control information generating sub-means further generating a second piece of control information indicative of a termination of sound for said each of said plurality of keys when the value of said each of said plurality of key position signals is matched with one of said thresholds after entry into said ready for tone generation.
5 more elements
Dependencies are inferred from the claim text.