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Update Tfilter design link in FIR filter docs

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PaulStoffregen 8 years ago
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supported filter length is 200 points. supported filter length is 200 points.
</p> </p>
<p>The free <p>The free
<a href="http://t-filter.appspot.com/fir/index.html" target="_blank"> TFilter Design Tool</a>
<a href="http://t-filter.engineerjs.com/" target="_blank"> TFilter Design Tool</a>
can be used to create the impulse response array. Be sure to set the sampling can be used to create the impulse response array. Be sure to set the sampling
frequency to 44117 HZ (it defaults to only 2000 Hz) and the output type to "int" (16 bit). frequency to 44117 HZ (it defaults to only 2000 Hz) and the output type to "int" (16 bit).
</p> </p>

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