Crashem
500+ Head-Fier
- Joined
- Feb 5, 2014
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Any word on people with old cases and what options we have?
Everything can be reconstructed, provided your interpolation filter has enough taps to provide the necessary approximation of the sinc function (Nyquist-Shannon sampling theorem).
That's where the new Spartan 6 FPGA are like a breakthrough for audio processing: the advances in lithography made it possible to dramatically increase the number of gates while reducing the power consumption -> welcome Hugo!
Cost is of course a factor: the Spartan 6 tray costs < $100.
The Virtex 7 (flagship) features 13 times more gates but cost > $4,000...
We can just hope Xilinx and Altera will continue developing their process and offer better FPGA for cheaper in the future...
Pool: [COLOR=B22222]BEST headphone for HUGO[/COLOR]
*********************************************
Now that I finally received my HUGO, and was told by Rob NOT tu use any external Amp , I need to choose a "non leaking" headphone that has the best possible synergy with the HUGO (I already have TH-900 & Roxane that pair very well with Hugo -)
[COLOR=B22222]--> Anybody tested AlphaDOG, SignaturePRO, or other TOL "isolating" headphone with the HUGO ? [/COLOR]
Any, on a wider scope, any other headphone recommended that offer even more Grunt & Musicality with the HUGO...
Thanks Rob. So a follow up:
* many of us who have reviewed/evaluated the Qute DACs (HD and EX) have found that we enjoy the sound from a USB/SPDIF converter better than direct through the USB receiver on the Qute (especially true on HD where a UK Hifi magazine measure the USB output has having significantly more measured jitter than the SPDIF..although still within reasonable spec). Do these reports make any sense to you? If so, would the same hold true for the Hugo (one dealer/user, Richard/Aumamp has already reported he thinks the Hugo goes to another level using an Audiophileo AP2 and a good linear ps for said converter)? As another data point, I have recently been able to send the EX unpowered USB and subsequently found the differences between it and the SPDIF not a real issue anymore (which tells me maybe we were hearing rf noise, not jitter). FYI.
Two questions for Rob:
What's the best battery powered source you've used with the Hugo?
What's the best source you've ever used with the Hugo?
I'd expect the latter to be a Chord product of course, but I'm curious about the first.
Rob, a question on your answer above.
You say that redbook is capable of better timing, possibly exceeding DSD. Doesn't this depend on whether the information is in the initial recording? If a recording has been made at 16/44 for example, is the timing information still present in the original recording able to be reconstructed below 22uS? Surely the smallest interval recorded is 22us and therefore transients smaller than this will be lost and cannot be reconstructed ...?
Yes good point. The key is that the sampled data must be bandwidth limited to 22.05kHz, so there is no information of smaller than 22uS samples to start off with. Then if you use an infinite tap length FIR interpolation filter the original bandwidth limited signal is perfectly reconstructed. This also means if a transient starts half way through a sample, then the reconstructed signal will also start half way through. But to do this, you must have infinite taps for perfection. as soon as you start reducing the number of taps, then the precision of the timing of the transient in the middle falls off. I know these concepts are difficult, I have been thinking along these lines for 30 years, and I still find it hard!
Everything can be reconstructed, provided your interpolation filter has enough taps to provide the necessary approximation of the sinc function (Nyquist-Shannon sampling theorem).
That's where the new Spartan 6 FPGA are like a breakthrough for audio processing: the advances in lithography made it possible to dramatically increase the number of gates while reducing the power consumption -> welcome Hugo!
Cost is of course a factor: the Spartan 6 tray costs < $100.
The Virtex 7 (flagship) features 13 times more gates but cost > $4,000...
We can just hope Xilinx and Altera will continue developing their process and offer better FPGA for cheaper in the future...
Quote:
Thanks, I think I understand that. But isn't this where theory departs from practice? In reality, there will always be information above 22.05Khz (or half whatever sampling frequency is used), and artificially limiting bandwidth at the recording stage means that you will always exclude transients which start between samples. The only way to avoid this is increasingly high sampling frequencies. Transients lost during early digital recordings at 44.1khz will never be able to be reconstructed even with infinite taps, which is one reason why early digital sounds like un-lifelike.
Love my Hugo but why is Bluetooth input so damm noisy? Does not matter what Bluetooth device used I still get a lot of noise.
Anyone else getting the same problem?
...when I talk about transients, its about the timing of the transients, not the speed of the rising edge of the transient...