From this link I posted earlier:
http://www.oppodigital.com/KnowledgeBase.aspx?KBID=129&ProdID=UDP-205
It says:
"Once the signal reaches the receiving end, for PCM and DSD audio, the reconstructed audio clock is usually used directly to drive the audio data. As a result, the HDMI audio jitter reduction circuit can improve the sound quality of PCM and DSD audio directly. For bitstream audio in compressed formats such as Dolby Atmos, Dolby TrueHD, DTS:X or DTS-HD Master, the jitter reduction benefit depends on whether the decoder design in the audio processor/receiver uses a synchronous or asynchronous clock. Compressed audio decoding requires buffering of the audio data and performing mathematic manipulations. If the decoder uses a synchronous clock design, the decoded data is usually driven out with a clock that is 1x, 2x, or 4x that of the reconstructed audio clock but synchronized to it, so the benefit can carry over. If the decoder uses a completely new, locally generated clock to drive out the decoded data, then jitter reduction on the player side is not a benefit, but the same circuit ensures error-free delivery of the bitstream audio data to the decoder thanks to a very stable HDMI video clock and a constant CTS value.
The Conclusion
The HDMI jitter reduction circuit in the UDP-205 is a unique design which can significantly reduce jitter and eliminate timing errors. Customers can enjoy their music with increased accuracy when using the audio-only HDMI output port for connecting the audio signal to an A/V processor or receiver."
In that link they provide graphs and numbers from their measurements.
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Some AV receivers employ the ESS DAC:
http://www.pioneerelectronics.com/PUSA/Home/AV-Receivers/Elite+Receivers/SC-LX901
"The highly acclaimed 192 kHz/32-bit ESS SABRE32 Ultra DAC (ES9016S) is adopted to deliver exceptional sound, with ultra-low distortion and high signal-to-noise ratio. It offers jitter-free performance for an astounding audio reproduction with rich deep bass, maximizing the full potential of Pioneer’s Class D3 amplifiers."
And like you mentioned, some of the older Pioneer Elite AV receivers with PQLS, which I also referred previously:
[video=youtube;kWq9fUNet-Q]
https://www.youtube.com/watch?v=kWq9fUNet-Q[/video]
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And according to some any quality AV receiver/SSP or separate DAC can take advantage of the digital HDMI audio jitter reduction provided by the Oppo 205's HDMI Out (Audio Only) port (#2) from potential audio improvement. This was indeed my question; can they?
Because someone mentioned that in order to benefit from it the AV receiver or pre/pro would need to also have a jitter rediction circuit in its own digital HDMI audio signal flow, its own clock.
But according to that quote from Oppo above it depends on whether the decoder design in the audio processor/receiver uses a synchronous or asynchronous clock.
Paul in his reply to my question, and from the Oppo 205's litterature, ...we have some answers.
This is certainly new from the new Oppo 205 just released now. All previous top models (105, 105D, 95) didn't have that special HDMI jitter reduction circuit.
If there wouldn't be any benefit with hi-end receivers and pre/pros, why even bother?
What would be best is to measure the amount of jitter from the main HDMI out versus the HDMI Audio only of the Oppo 205 connected to the same receiver, say for example a Yamaha RX-A3060 flagship:
https://ca.yamaha.com/en/products/a...rs_amps/rx-a3060_u/features.html#product-tabs
That receiver too employs an ESS ES9016 DAC, but doesn't mention any "jitter reduction" in its clock implementation.
This Pioneer AV receiver:
http://www.pioneerelectronics.com/PUSA/Home/AV-Receivers/Elite+Receivers/SC-87
"PQLS Bit-stream.
Pioneer’s special jitter reduction technology makes reproduced sound more realistic by utilizing the master audio clock in the Elite SC-85 for playback instead of the video clock in a compatible Blu-ray Disc player.
ESS-DAC Sabre32 Bit for All-Channel.
All channels of the Elite SC-87 employ ESS-DAC SABRE32 technology, the world’s highest performance 32-bit audio DAC solution, delivering spectacular sound with a minimum of harmonic distortion."
Or the top Anthem, Arcam, Rotel pre/pro, Denon/Marantz, Onkyo/Integra AV receivers/SSPs, NAD, McIntosh. Krell, Bryston, Classe, AudioControl Maestro, Theta Digital, Steinway Lyngdorf, Datasat, JBL Synthesis, ADA, Trinnov Altitude, ...SSPs.
Which AV receivers and pre/pros can benefit best from the HDMI audio jitter reduction of the new Oppo 205? All of them, some of them, with synchronous clock design, with/without their own jitter reduction system, ...?
We measure, we listen, we evaluate, we analyse, we make a mental and/or fundamental decision based on pleasurable sensory spaces of our own ear drums in harmony with our own emotional chords, or pulsations of the heart and soul, or psychological inclinations, or faith, or a combination of some or all including the best set of measurements?
The Oppo 205 looks great in&out, on paper, on literature, on promotion, on specs, on features, on weight, on versatility, on universality, on ultra hi-res audio, on ultra hi-def video, on the new HDMI audio jitter reduction circuitry, on value (only $1,300 - way too low for the high-end society), on everything but it's ultra low price.
There are simply no other 4K Blu-ray players that cost more. ...And the cheapest one, Samsung UBD-K8500 is $199 (less than the price of a high-end Y RCA connector).
:b Sorry for the mix of technical audio matters with the air we breathe every single day.
I'm the type who believe that matching that HDMI Audio only out with the right HDMI in will result in optimal performance; objectively, and subjectively too.
But with a clause: How do we determine with absolute certainty that "optimal performance"? Because every components matching in the world would need to be tested, and it is impossible.
Anyway it cannot hurt to have a jitter reduction clock in all the audio components of the system's chain.
It's like having truly balanced XLR connections from input to output.
There will be eventual professional reviews of that Oppo 205 with its new HDMI audio circuitry (jitter reduction), and with measurements performed and graphs delivered. It'll be very interesting.
One last thing: In audio the pursuit of excellence is always evolving, in both analog and digital forms.
In video the analog projectors and other analog moving images reproducers aren't coming back; we are truly in the digital video world constantly advancing...4K/UHD, HDR10, HLG, WCG, Dolby Vision, 8K, 3D, 4D, 16K, ....Holo (graphy).
In audio, DTS:X, Dolby Atmos, Auro-3D, ...all digital (multichannel hi-res).
Stereo, analog tubes from tape sources and acetate. Jitter? :b