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工作学习 / IT技术讨论 / 我不理解这段话.请哪位电信或TAPI大侠赐教:Since the maximum frequency response of a POTS line (conventional analog telephone line) is 3.1 kHz, anything above 8 kHz will not improve the audio quality noticeably.Therefore, the 8 kHz - 16 bit - Mono format used by the TAPI card should be enough to offer a crystal clear voice sound quality for telephone lines.
前半句说电话线频率带宽3.1 kHZ,接着说8 kHZ的语音就够了,多于8 KHZ的白搭.
我不明白为何说是 8kHZ 呢?而不说4k HZ的语音就够了?
-youngerbrother(http:fun.to/hongwei);
2002-11-28
{271}
(#883276@0)
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3.1kHz指的是3dB带宽。
-ss72(闲人);
2002-11-28
(#883295@0)
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补充：为了传输4kHz的信号，取样率需达到8KHz，它的8kHz应该是数字信号的速率---8kHz，16bits?right? 根据：奈奎斯特取样定理
-ss72(闲人);
2002-11-28
(#883349@0)
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thank you so much
-youngerbrother(http:fun.to/hongwei);
2002-11-28
(#883367@0)
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实际的数字传输是64K，所以应该是8Kx8BIT 就够了。
-silmbamboo(纤竹);
2002-11-28
(#883697@0)