(The solution provided by Intel is to realize voice management through software DSP, and declares that the DSP module can manage four channels of PCM narrowband voice together, and supports various functions such as voice coding and echo cancellation. As we all know, the one-way one-way PCM voice rate is 64Kbps, the one-way two-way is 128Kbps, and the 4-way two-way is 512Kbps)