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Musical-Applications-of-Microprocessors-2ed-Chamberlin-H-1987

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DIGITAL FILTERING 525<br />

When the output buffer becomes full, a dump routine is called to transfer it<br />

someplace. Likewise, when the input buffer becomes empty, a load routine is<br />

called to refill it.<br />

Note that, if the sample rate is being converted downward (R> 1), the<br />

data must be separately low-pass filtered (or have been adequately oversampled<br />

in the first place) prior to the sample-rate conversion. The interpolation<br />

filter described cuts <strong>of</strong>f at one-half the input sample rate and therefore does<br />

no bandlimiting itself.

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