Pioneer PQLS

http://www.pioneerelectronics.com/PUSA/Products/HomeEntertainment/AV-Receivers/Enhanced+Content/Receivers/Performance/Jitter

其實這就是由receiver端發出clock，transmitter端當slave，
如同上回談過的async USB http://records2ear.blogspot.com/2009/11/async-usb.html ，
以此法來避免clock訊號長距離傳輸波型失真造成的jitter。