[sdiy] move over you 32 bit DACs ...

cheater cheater cheater00social at gmail.com
Tue Feb 1 18:56:29 CET 2022


Isn't it obvious, Mike? He runs his silicon at 0.1K

On Tue, Feb 1, 2022 at 6:39 PM Mike Bryant <mbryant at futurehorizons.com> wrote:
>
> Oh he must have some of these magical zero ohm rbb, zero ohm ree transistors I've been dreaming about finding for the past 40 years !    All resistors have Johnson noise even if they were perfect, which they aren't, and resistance inside a transistor is no different to resistance inside a resistor, other than the noise it generates gets multiplied by the transistor gain setting :-)
>
>
> -----Original Message-----
> From: cheater cheater [mailto:cheater00social at gmail.com]
> Sent: 01 February 2022 13:18
> To: Mike Bryant
> Cc: Roman Sowa; Synth-Diy mailing list
> Subject: Re: [sdiy] move over you 32 bit DACs ...
>
> Of course, the whole point becomes moot when you consider...
>
> Recently I've been trying to learn about transistor biasing, and how to measure transistor self-noise. I had spoken to a user in a metrology oriented community for several hours, who has the best, NIST-traceably calibrated, electronics measurement devices. I could list them, but let's just say they cost a whole lot. Soon after that he told me that transistor noise does not exist, and for audio circuits noise is absolutely irrelevant anyways, and the mere concept upsets him, and therefore he cannot help me with measuring something that doesn't exist.
>
> In which case we should be aiming for direct 128-bit output at the very least...
>
>
> On Tue, Feb 1, 2022 at 1:32 PM cheater cheater <cheater00social at gmail.com> wrote:
> >
> > Nothing wrong with a 64-bit internal signal path, I mean it's
> > computationally trivial right now, so why not do it? 64-bit processing
> > in the master section has been standard for decades in audio
> > engineering. If you're re-mastering audio (as in this case, changing
> > formats, which also falls under re-mastering), I don't see why you
> > should settle for less bit depth than what the studio doing the
> > original master used.
> >
> > Just to prevent misunderstandings on the word "mastering". Note that
> > some people think mastering means "applying eq and compression so
> > things sound nice"... but the term generally means "preparing audio
> > for a specific output format" which in this case is done using the
> > oversampling filter which has to run at *some* bit depth.
> >
> > On Tue, Feb 1, 2022 at 10:24 AM Mike Bryant <mbryant at futurehorizons.com> wrote:
> > >
> > > Websites are cheap, even that one.  You should see how much they spend being lead sponsor on the World Rally Championship.  Every car has to have their window sticker, banners all along the route, start and finishing arches, free jackets for marshals and lots of other stuff.   I doubt any of the drivers and 99.9% of fans watching live or on television even know what they make, but it's all aimed at the world's #1 petrolhead Akio Toyoda, who just happens to run Toyota :-)
> > >
> > > I expect in the past they'd just have taken him out every month for a night with some geishas, but corruption laws are stricter than a few decades ago.
> > >
> > > AKM do make things other than audio convertors, such as sensors and DSPs, but they're certainly not Intel or TSMC.
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf
> > > Of Roman Sowa
> > > Sent: 01 February 2022 08:08
> > > To: Synth-Diy mailing list
> > > Subject: Re: [sdiy] move over you 32 bit DACs ...
> > >
> > > What a website!
> > > If anyone haven't seen velvetsound website, I encourage you to do that.
> > > All the time I had to rpeat to myself - "this is IC manufacturer", because it doesn't look look like any.
> > > Stunning pictures, with colors processed so much they become unreal, the video included contains only the finest marketing blah blah. It all looks like company building luxury houses.
> > >
> > > AKM knows best where the money is. Have you checked recently how expensive is audio-grade power cable for audio-grade ethernet switch?
> > >
> > > Roman
> > >
> > > W dniu 2022-01-31 o 15:41, Tom Corbitt pisze:
> > > > Bits? Who needs bits? They're using VELVETSOUND(tm).
> > > >
> > > > Per their website:  "A faithful re-creation beyond any numerical
> > > > representation"
> > > >
> > > > https://velvetsound.akm.com/us/en/
> > > > <https://velvetsound.akm.com/us/en/>
> > > >
> > > > Tom C
> > > >
> > > > On Mon, Jan 31, 2022 at 8:43 AM Roman Sowa <modular at go2.pl
> > > > <mailto:modular at go2.pl>> wrote:
> > > >
> > > >     It's not even a DAC, but just the modulator and still claims barely
> > > >     150dB S/N? That's not even 32 bits by far!
> > > >     Also it doesn't claim 64-bit audio input, just that the filter is
> > > >     working with 64-bit words.
> > > >
> > > >     Is it good idea to start audiophile DAC company now?
> > > >
> > > >     Roman
> > > >
> > > >     W dniu 2022-01-31 o 13:09, Vladimir Pantelic via Synth-diy pisze:
> > > >      > the PCM 64-bit/1536kHz boys are here:
> > > >      >
> > > >      > https://www.akm.com/eu/en/products/audio/audio-dac/ak4191eq/
> > > >     <https://www.akm.com/eu/en/products/audio/audio-dac/ak4191eq/>
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