Voice Call quality is one of our essential design considerations.
Qualcomm CVC(Clear Voice Capture) is a software solution processing the in/out digital signal for echo cancellation and noise reduction.
However, in the most indoor use case and earphone use case, there is not much echo problem or wind noise issue, and CVC might not provide many benefits.
Of course, CVC can enhance the voice call quality, but the baseline microphone performance would impact the voice quality much more.
5K with high sensitivity MEMS microphone would provide good enough voice call quality.