我知道滤波器的问题,但是从来没有看到过测试,可能需要查论文才能看到。
比如:摘https://www.reddit.com/r/headphones/comments/ic7b37/qudelix_5k_dac_filters/
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Filter design is one of those areas of mathematics where the universe seems to be cruelly designed to frustrate us. No matter how you try, you can't design the perfect filter; it always introduces problems in either the time or frequency domain. The potential problems include: Ringing - sounds start or end a bit before they should Aliasing - high frequency information bleeds into lower frequencies Latency - there is a delay before the audio is played Phase delay - the various frequencies are smeared at transients
Improving one of these always makes at least one of the other three worse: Fast filters have less aliasing than slow filters, but more ringing Linear phase filters have no phase delay, but minimum phase filters have high latency Brickwall filters focus on aliasing, to hell with the other three Apodizing filters are some kind of weird compromise
People have argued for decades over which of the four problems is more audible. The honest answer is, probably none of them, but you're welcome to try the different filters and see what you like. I recommend linear fast for playing music, or minimum fast in a live audio situation.”
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