Voice activity detection

Hello,
when I use a large moel 1GB< the processor load is quite high even if nothing is spoken.
A solution would be a voice activity detection (short vad).
So that the `VoskRecognizer` only the data processed when speech was detected.

Edit:
Yeah, I know that `vosk_recognizer_accept_waveform` return 1 if it detects silence but the cpu load is still pretty hight.

2. Edit:

The CPU load goes up to 25% in idle mode(it processes data but nothing is spoken). If I stop the microphone input the cpu load goes down to 0%