StreamVC is a real-time low-latency voice conversion solution developed by Google. It is capable of matching the target voice's timbre while preserving the source voice content and prosody. This technology is particularly suitable for real-time communication scenarios such as phone and video conferences, and can also be used for applications such as voice anonymization. StreamVC achieves lightweight and high-quality voice synthesis through the architecture and training strategies of the SoundStream neural audio codec. It also demonstrates the effectiveness of learning the causality of soft speech units while providing whitening base frequency information to improve pitch stability without revealing the source voice timbre.