lzhs 发表于 2021-9-30 08:07 
“抖动有很多算法,各有特点,不存在最好的抖动算法”,这句话,是从哪儿抄来的?介绍下出处
要不给我们科普下,具体的含义?
你给我们演示下:可以装个jr试试精确位抖动,看看cpu占用情况,再和无抖动的cpu占用对比一下。
真想看看你们这帮民科能搞出啥样的花头
提这个质疑说明你没有认真研究过播放软件,关于抖动一无所知,想学总是好事,下面列举了常用的抖动及特性说明,成全你:
TPDF dithering features the most audible quantization noise. It does not shape
the spectrum of noise to reduce the perceived noise loudness.
Cool Edit C1 curve features reduced amount of low-frequency noise below 9
kHz, but high-frequency noise in audible range is significantly increased. The most
audible noise is concentrated around 12 kHz (around second spectral peak of human’s
ear sensitivity). That is why the perceived amount of noise reduction is low.
Cool Edit C3 curve tries to approximate the curve of human hearing threshold.
But the approximation is very rough (most probably because of a too low order of noise
shaping filter), and high peaks and pits in noise spectrum can lead to unpleasant noise
coloration.
UV22 word length reduction system reduces the noise floor over the whole
audible range by approximately 5 dB. The perception of noise is similar to white TPDF
noise, reduced by 5 dB.
Sound Forge’s noise shaping features insufficient dithering amount, which
leads to noise modulation and even small harmonic distortion. The noise shaping curve
tries to approximate the curve of human hearing, but the approximation is very rough
again.
L2 “Normal” preset features good noise reduction around 4 kHz, at the expense
of highaudible noise power around 14 kHz (clearly noticed esp. by younger listeners).
L1-Ultramaximizer’s “Normal” preset features some noise reduction below 9
kHz, at the expense of moving noise from these frequencies to less audible range of 9
kHz – 16 kHz.
WaveLab’s Type3 curve is another approximation of human hearing threshold,
but the approximation is rough. There’s an excessive amount of audible noise around 9
kHz.
Cool Edit 44.1 KHz curve is a more adequate approximation of the human
hearing threshold. Nevertheless the curve is far from optimal (too low filter order
again?). It could be much closer to optimal if the spectral pit at 21 kHz – 22 kHz is
filled with frequencies from around 12 kHz.
L2 “Ultra” preset is much like L2 “Normal” preset, but with less noise below 15
kHz, and more noise above 15 kHz. Still high audible noise power around 15 kHz.
POW-r3 spectrum curve resembles Meridian-D and WaveLab Type3 noise
shaping curves. The most audible noise of POW-r3 curve is around 8 kHz. We also
suggest that there is excessive amount of noise reduction around 3.5 kHz. The noise
floor of most high-resolution professional electronics is much higher than the noise
floor of POW-r3 curve around 3.5 kHz. Probably, moving some noise from 7 kHz – 10
kHz to the band around 3.5 kHz would reduce the perceived noise audibility (and
smooth the noise spectrum too)