发明名称 |
STARTUP AND SHUTDOWN CLICK NOISE ELIMINATION FOR CLASS D AMPLIFIER |
摘要 |
<p>A method of minimizing an audible click noise from a speaker in a Class D audio power amplifier upon shutdown or startup of a switching stage having two switches series connected at a node, the speaker being connected to the node via an output filter comprising an inductor and a capacitor, the switches being controlled by a controller. The method including the steps of determining a timing interval at the node to transition a peak voltage of the capacitor, the capacitor voltage being a speaker voltage; and eliminating the audible transient voltage excursion across the speaker that causes a click noise during the timing interval, wherein at startup ON and OFF times of the switches are incrementally increased from zero to a normal mode and at shutdown the ON OFF times of the switches are incrementally decreased from the normal mode to zero.</p> |
申请公布号 |
WO2008019122(A2) |
申请公布日期 |
2008.02.14 |
申请号 |
WO2007US17460 |
申请日期 |
2007.08.06 |
申请人 |
INTERNATIONAL RECTIFIER CORPORATION;STRYDOM, JOHAN TJEERD;HONDA, JUN |
发明人 |
STRYDOM, JOHAN TJEERD;HONDA, JUN |
分类号 |
H03F3/217 |
主分类号 |
H03F3/217 |
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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