常用的SAI 时钟频率（SAI Frequency）

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本文介绍了不同应用场景下的音频采样率标准，并详细解释了WM8994音频编解码器在48kHz采样率下，配置为256倍频时的工作时钟频率计算方式。此外还探讨了比特时钟(BCLK)和帧时钟(FLRCK)的概念。

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fs Sample Rate.

8k Hz - Telephone

11.025k Hz

22.05k Hz - Radio Broadcast

32k Hz - miniDV, DAT (LP mode)

44.1k Hz - CD, MPEG-1 Audio(VCD, SVCD, MP3)

47.25k Hz - Commercial PCM Recorder

48k Hz - miniDV, Digital-TV, DVD, DAT, Movie & Pro-Audio

50k Hz - Commercial Digital Recorder

96k/192kHz - DVD-Audio, LPCM DVD, BD-ROM, HD-DVD

2.8224M Hz - Direct Stream Digital Sigma-Delta Modulation(1 bit)

MCLK The system clock of slave device.

Most usual frequency - 256fs, 384fs, 512fs.

BCLK The bit clock.

SLOT Transmit data from different audio source.

exp.

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This example is base on WM8994.

If the sample rate of audio is fs = 48kHz and the clock of WM8994 has been configured as 256fs, the fmclk = 256 X 48kHz = 12.488MHz. SAI run in I2S mode and the flrck = fs. A frame is 64bits long because WM8994 can receive 2 slot(each has 16bits) for output and fbclk = 64 X fs = 3.072MHz.