Is jitter audible and what does it sound like? Reply #75 – 2015-09-06 17:29:44 Quote from: saratoga on 2015-09-02 22:45:09Could you explain this in a little more detail? I'm not understanding why HDMI would influence jitter of the downstream system. HDMI is a packet-based digital protocol, how does the rate at which packets arrive influence the analog performance of the device?The rate at which the packets arrive is not the only relevant variable. For example SP/DIF packets arrive in a fairly continuous stream while HDMI packets generally arrive with big time delays between them. Audio is a fairly small percentage of a HDMI stream and the packets are relatively sparse. QuoteUnless the DAC is actually clocked off of the HDMI clock (which would be tough since a lot of different HDMI clocks are possible), the DAC's jitter shouldn't depend on if you fed it with HDMI or any other input. Just like how playing Spotify vs. iTunes doesn't change the jitter in your sound card.You're right - the jitter that was observed with some AVRs and HDMI inputs should not have happened. It is probably a classic case of the squeaky gear. I seem to recall comparing Miller's jitter numbers to the standards in:Eric Benjamin and Benjamin Gannon, "Theoreticaland Audible Effects of Jitter on Digital AudioQuality", AES Preprint 4826, presented at the AES105th Convention, San Francisco, September 1998. and Miller's data was too incomplete for a comparison.I'm under the impression that by the time your audio card sees the audio data stream from these services, it has been cleaned up quite a bit.Most DAC chips are fairly susceptible to jitter all by themselves, but the buffering that drives them (such as in CD players) has generally been pretty good.