OT82111_VC1 Firmware Test Guide¶

1. Block Diagram Overview¶

2. Default Input and Output of A316-LS-MIC-V2¶

• The default input from A316-LS-MIC-V2 to A316 is fixed at 24-bit 48KHz.
• Regardless of the sampling rate selected during recording, when the USB device outputs to the 3.5mm audio jack (for headphone testing), the audio will always be converted to 24-bit 48KHz for playback.
• The audio format output from the USB device to the playback device is 24-bit 48KHz and cannot be changed.

3. I2S Output Sampling Rate Acquisition and Switching¶

The A316-LS-MIC-V2 evaluation board supports switching between different input sampling rates via a button, and the audio will be normally output through the 3.5mm jack (for headphone testing). Supported sampling rates include: 44.1KHz, 48KHz, 88.2KHz, 96KHz, 176.4KHz, 192KHz. For precise measurement of the sampling rate, you can use a logic analyzer to capture the waveform (actual measurements may have some error).

1. Button Position for Switching Sampling Rate¶

2. A316-LS-MIC-V2 Waveform Capture Wiring¶

3. Recording and Waveforms at Different Sampling Rates (All 24-bit)¶

• 44.1KHz:
  
  

• 48KHz:
  
  

• 88.2KHz:
  
  

• 96KHz:
  
  

• 176.4KHz:
  
  

• 192KHz: