发明名称 |
Sound generator circuit system and method |
摘要 |
A sound generator circuit configured for a handheld computer is disclosed. A method of producing a tone with a sound generator and handheld computer is also disclosed. The sound generator circuit includes a low pass filter having an input and an output. The input is coupled to a pulse width modulated (PWM) signal line. The sound generator circuit also includes a switching circuit coupled to the output of the low pass filter and being controlled by the output of the low pass filter. Further, the sound generator circuit includes a sound generator having a first and a second terminal. Further still, the sound generator circuit can include a high-pass filter coupled across the first and second terminals.
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申请公布号 |
US6725109(B2) |
申请公布日期 |
2004.04.20 |
申请号 |
US20010803824 |
申请日期 |
2001.03.12 |
申请人 |
PALM, INC. |
发明人 |
HILE WAYNE B.;HENRIE JAMES B. |
分类号 |
H04R3/00;(IPC1-7):G06F17/00;H03F3/217;H03F3/38 |
主分类号 |
H04R3/00 |
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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