Patents were always intended to be for bright ideas - that means bright technical ideas, not bright commercial ideas.
The funny thing about this particular patent is that it relies on a low shunt impedance for the filtering action, which in turn only works if you have a sufficiently high series impedance for the mains supply. This impedance is poorly defined, and the patent description doesn't seem to highlight this basic flaw. All good mains filters have series and shunt elements.
The funny thing about this particular patent is that it relies on a low shunt impedance for the filtering action, which in turn only works if you have a sufficiently high series impedance for the mains supply. This impedance is poorly defined, and the patent description doesn't seem to highlight this basic flaw. All good mains filters have series and shunt elements.
John,
When you see your multi degree engineer mate - Any chance you
can find out from him what a successive approximation DA actually is?
SAR is an ADC architecture.
Which ADC Architecture Is Right for Your Application? | Analog Devices
cheers
Terry
DAC in my Devialet amplifier sounds fantastic. They use PCM1792. Which is a delta-sigma. It's just all in the execution, layout, mechanical grounding, parts with certain sound character, etc. Everything matters.
Looks like they also have a Cirrus WM8740 delta-sigma DAC inside as well.
Looks like they also have a Cirrus WM8740 delta-sigma DAC inside as well.
Last edited:
That video was not meant for an audience of the type that would frequent this thread.
We can put it in the background while we demagnetize all our LP's. Some lose sight of how narrow and audience is that is represented here, there are stupidly priced hi-end audio products that are full of IC's and other horrifying things and they get rave reviews and customers. There are also people passionate about music who listen live when they can and defer to reproduction when they have to that don't hear .01uF caps bypassing 1000uF power supply caps. They don't bother with this kind of chat, I wonder why?
Last edited:
John, You really need to try Benchmark DAC-3. It uses some digital methods that are not used on the ES9038 evaluation board. They do make a difference, so I would agree that you are probably not hearing 9038 at its best. If you were to get someone who knows how to fix the digital stuff for you, then you might have some better audio to work with. As it stands, I would say you are probably working at a disadvantage.
View attachment US5260862.pdf
Thanks, Mark. And, yeah, if the referee goes by Manny, that's just the guy you want doing all the patents for utility-level electrical systems.
Richard, that's what I was trying to say--the link I gave just showed the parasitic series inductance/resistance of the respective capacitors and the self inductance of the traces. Yours is a many-tap explicit RLC array. I'm admittedly surprised you were able to get this patent, truth be told, but 1991 means it's well past its last renewal.
I wish Sy was still postin. He seemed to have a deep knowledge of the US Patent System.
Cheers,
Jeff
Last edited:
If you read the datasheets you'll find the ES9038 is basically 4x ES9028 DAC sections in parallel. Given that the ES9028 already has dynamic range far beyond need, I would probably use the 9028 over the 9038 in a stereo application. The output current of the ES9038 is quite high in stereo mode. The ES9038 was probably designed primarily to be used in an 8 channel system while still yielding ES9028-level stereo configuration specs.
@chris719 Yes. Actually, DAC-3 probably does use ES9028 now that I think more about it. Anyway, seems like most people tend to focus attention mainly on analog output stage stuff and disregard the importance of the digital processing that is a big part of DAC-3 sound quality.
Last edited:
- Status
- Not open for further replies.