| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 1 | Apparatus for determining tonal characteristics of an object and method thereof | US6074 | 1993-01-15 | US5390248A | 1995-02-14 | Marc H. Segan; Michael Newsome |
| An apparatus is provided for evaluating the tonal characteristics of an object with respect to a nominal tone which comprises a striker for causing the object to generate an audio signal and a microphone for inputting the audio signal. A reference signal generator generates plural reference signals in accordance with the nominal tone, and those signals are mixed with the audio signal by a mixing circuit. The accuracy of the audio signal with respect to the nominal tone is evaluated in accordance with the audio signal mixed by the mixing circuit. | ||||||
| 2 | Keyboard for a carillon | US504487 | 1983-06-15 | US4570528A | 1986-02-18 | Peter Bakker |
| In a carillon or chimes keyboard, which may be a manual or a pedal set, theeys (sticks or pedals) and the frame for taking them up pivotally are provided with cooperating surfaces, one surface on the key hitting the other surface on the frame at the end of the upward release movement of the key after it has been depressed for operating a bell.For dampening the clattering noise caused by this hitting, the invention provides for such cooperating surfaces on the keys and the frame, which are inclined, preferably at about 30.degree., to the upward direction of movement of the keys just before they hit on the frame during this release movement. | ||||||
| 3 | Time actuated mechanism | US67139533 | 1933-05-16 | US2067472A | 1937-01-12 | BRASSELL ALVY R |
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