发明名称 |
SOUND GENERATING SYSTEM FOR A KEYBOARD |
摘要 |
<p>A method and apparatus for establishing the volume level of a tone generator associated with a keyboard in which the tone generator will output a click tone when each key on the keyboard is actuated. In establishing the volume level of a click tone, the keyboard is put into a volume setting mode by the actuation of two key members of the keyboard. The subsequent actuation of each key member will produce a different volume level of the click tone. The actuating of a key member results in the storing of a count in a storage member. The storage member is then downcounted until it reaches zero. Upon reaching the count of zero, processing means generates a pulse train in which the pulse width is determined by the time it takes for the storage member to count down to zero.</p> |
申请公布号 |
EP0235251(B1) |
申请公布日期 |
1990.10.17 |
申请号 |
EP19860905512 |
申请日期 |
1986.08.15 |
申请人 |
NCR CORPORATION |
发明人 |
SEEVERS, DANIEL;ROHULICH, JOHN |
分类号 |
G06F3/02;G06F3/023;G06F3/048 |
主分类号 |
G06F3/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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