发明名称 |
Analog filter for digital audio system and audio amplifier for using the same |
摘要 |
An analog filter is connected at the output of a D/A converter. The analog filter eliminates higher frequency components than the original basic frequencies for a digital audio system and improves the phase characteristic. The analog filter comprises a plurality of band elimination filters that have respective cutoff frequencies of integral multiples of the sampling frequency fs. An audio amplifying circuit is connected to the analog filter. Each band elimination filter eliminates side band components close to integral multiples of the sampling frequency. By such construction, the analog filter has the necessary amplitude characteristic and lessens phase shift within the basic frequency.
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申请公布号 |
US6721427(B1) |
申请公布日期 |
2004.04.13 |
申请号 |
US20000588381 |
申请日期 |
2000.06.07 |
申请人 |
ZANDEN AUDIO SYSTEM CO., LTD. |
发明人 |
YAMADA KAZUTOSHI |
分类号 |
H03M1/08;H03H7/01;H03H7/06;H03H7/07;H03H11/12;H03M1/66;(IPC1-7):G10K11/36 |
主分类号 |
H03M1/08 |
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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