1.0 傅里葉變換

1.0.1 傅里葉變換 與 逆傅里葉變換

1.0.2 沖激函數

維基百科：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 卷積公式

連續卷積

維基百科：https://zh.wikipedia.org/wiki/%E5%8D%B7%E7%A7%AF

1.1 混響 reverberation

維基百科：https://en.wikipedia.org/wiki/Reverberation

Reverberation, inpsychoacousticsandacoustics, is a persistence ofsoundafter the sound is produced.[1]

A reverberation, orreverb, 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]

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出處：https://www.nti-audio.com/en/applications/room-building-acoustics/reverberation-time-rt60

Reverberation isa collection of many reflections of sound.

Reverberation timeis a measure of the time required for reflecting soundto "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: 聲壓級衰減了60dB所需時間

1.2 雙耳定位線索

ITD：到達兩耳的時間差
IPD：到達兩耳的聲波的相位差
ILD：到達兩耳的能量差

出處：https://www.researchgate.net/figure/Interaural-time-ITD-phase-IPD-and-level-ILD-cues-used-for-sound-localization_fig8_254706004

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ITD：

Using digital signals, the accuracy of TDOA based sound localization is limited by the sampling frequencyfs, as the reciprocal value offsrepresents the smallest possible delay difference.

到達時間差受限于采樣率，最小時間間隔為采樣率的倒數。

The microphone distancebdetermines the maximum quantity of different delay steps.

1.3 diffuse noise 擴散噪聲

出處：https://en.wikipedia.org/wiki/Diffusion_(acoustics)

Diffusion (acoustics) 擴散、散射

擴散，在聲學和建筑工程中，是指聲音能量在特定環境中均勻傳播的效果。完美的擴散聲空間是指在空間的任何地方都具有相同的關鍵聲學特性的空間。

diffuse noise是指在空間上任意位置，噪聲的特性都相同。

仿真：空間上所有位置的RIR都分別與某種噪聲卷積，最后相加。

[1] Valente, Michael; Holly Hosford-Dunn; Ross J. Roeser (2008).Audiology. Thieme. pp.425–426.ISBN978-1-58890-520-8.

[2] Lloyd, Llewelyn Southworth (1970).Music and Sound. Ayer Publishing. p.169.ISBN978-0-8369-5188-2.

1.4 白噪聲white noise

白噪聲（white noise）是指 功率譜密度 在整個 頻域 內是常數的噪聲。 所有 頻率 具有相同 能量 密度的隨機噪聲稱為白噪聲。
白噪聲是指在較寬的頻率范圍內，各等帶寬的頻帶所含的噪聲能量相等的噪聲。

——百度百科

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