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yoyiyi
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yoyiyi committed Jan 5, 2021
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8 changes: 4 additions & 4 deletions 音视频/001.音视频基本知识.md
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* B:双向差别帧,本帧与前后帧的差别

* 音频帧
* 对 PCM ,不需要帧
* AMR 帧,每 20ms 为一帧
* MP3 帧,包括采样率、比特率等参数。
* 对 PCM ,不需要帧
* AMR 帧,每 20ms 为一帧
* MP3 帧,包括采样率、比特率等参数。

* 量化精度:单位 bit(比特) 越高越接近原音乐
* 采样率:每秒音频采样点个数(8000/44 100 Hz),单位 Hz
* 声道:指声音在录制或播放时在不同空间位置采集或回放的相互独立的音频信号,所以声道数也就是声音录制时的音源数量或回放时相应的扬声器数量

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