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Antialias Filters and System Transient Response at High Sample Rates
Sample rates higher than 48 kHz allow freedom to tailor the audio response above 20 kHz in order to optimize the transient performance. A recording and reproduction chain may have pre- and postringing caused by brickwall band-limiting filters, but a single "apodizing" filter can substantially suppress the ringing and shorten the impulse response. The apodizing filter can be placed anywhere in the chain, but the mastering stage probably fits in best with current practice. The paper presents coefficients for a number of filters suitable for 96-kHz and 192- kHz sampled audio, and experimentation is encouraged. Some of the filters are symmetrical, but, taking into account the ear's sensitivity to preresponses, others have been optimized for a near-zero preresponse.
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