关于Jitter/延时/抖动

speedturtle

关于延时。
The latency is about the sound coming in and out again.
For Dj-ing with control vinyl to play wav, flac and pcm tune on a CPU.
It works like this, every turntable is converted to line level (RIAA conversion) and than send out to the CPU. so 2 turntables need 4 inputs.
A program MPD for example interprets the timecode and simulate pitch and song positions from the songs loaded in the memory.
This is than send back via the soundcards output. This way you can play digital audio files and have the control of real analog vinyl.
It‘s important to have a very low latency < 5ms at high sample rates.

关于Jitter/抖动
RTOS（实时操作系统） is needed for best sound quality with high-end systems: vacuum tube DAC fed by S/PDIF sound output.
When the output is not perfect real-time then so called "jitter" occurs which causes degradation of the sound quality.
You can't hear this with average soundcards and consumer headphones but it becomes very annoying with a better system. It can make your ears hurt. I am talking about pain.