1.0 傅里叶变换
1.0.1 傅里叶变换 与 逆傅里叶变换
1.0.2 冲激函数
维基百科：https://zh.wikipedia.org/wiki/%E7%8B%84%E6%8B%89%E5%85%8B%CE%B4%E5%87%BD%E6%95%B0
博客：https://blog.csdn.net/u010450214/article/details/50084769
1.0.3 卷积公式
连续卷积
维基百科：https://zh.wikipedia.org/wiki/%E5%8D%B7%E7%A7%AF
1.1 混响 reverberation
维基百科：https://en.wikipedia.org/wiki/Reverberation#cite_note-1
Reverberation, in psychoacoustics and acoustics, is a persistence of sound after the sound is produced.[1]
A reverberation, or reverb, is created when a sound or signal is reflected causing a large number of reflections to build up and then decay as the sound is absorbed by the surfaces of objects in the space – which could include furniture, people, and air.[2]
出处：https://www.nti-audio.com/en/applications/room-building-acoustics/reverberation-time-rt60#What-is-reverberation-time
Reverberation is a collection of many reflections of sound.
Reverberation time is a measure of the time required for reflecting sound to "fade away" in an enclosed area after the source of the sound has stopped.
The Reverberation Time (RT) is the time the sound pressure level takes to decrease by 60 dB, after a sound source is abruptly switched off.
RT60: 声压级衰减了60dB所需时间
1.2 双耳定位线索
- ITD：到达两耳的时间差
- IPD：到达两耳的声波的相位差
- ILD：到达两耳的能量差
出处：https://www.researchgate.net/figure/Interaural-time-ITD-phase-IPD-and-level-ILD-cues-used-for-sound-localization_fig8_254706004
ITD：
Using digital signals, the accuracy of TDOA based sound localization is limited by the sampling frequency fs, as the reciprocal value of fs represents the smallest possible delay difference.
到达时间差受限于采样率，最小时间间隔为采样率的倒数。
The microphone distance b determines the maximum quantity of different delay steps.
1.3 diffuse noise 扩散噪声
出处：https://en.wikipedia.org/wiki/Diffusion_(acoustics)
Diffusion (acoustics) 扩散、散射
扩散，在声学和建筑工程中，是指声音能量在特定环境中均匀传播的效果。完美的扩散声空间是指在空间的任何地方都具有相同的关键声学特性的空间。
diffuse noise是指在空间上任意位置，噪声的特性都相同。
仿真：空间上所有位置的RIR都分别与某种噪声卷积，最后相加。
[1] Valente, Michael; Holly Hosford-Dunn; Ross J. Roeser (2008). Audiology. Thieme. pp. 425–426. ISBN 978-1-58890-520-8.
[2] Lloyd, Llewelyn Southworth (1970). Music and Sound. Ayer Publishing. p. 169. ISBN 978-0-8369-5188-2.
1.4 白噪声white noise
白噪声（white noise）是指 功率谱密度 在整个 频域 内是常数的噪声。 所有 频率 具有相同 能量 密度的随机噪声称为白噪声。
白噪声是指在较宽的频率范围内，各等带宽的频带所含的噪声能量相等的噪声。
——百度百科
