I don't have any problem with that, but its best to ask the creator how something he created works. I have no way of knowing, and I would never simply copy it.
I am totally open to exploring alternate filters, but I am absolutely pleased with the current ones. 😎
I am totally open to exploring alternate filters, but I am absolutely pleased with the current ones. 😎
Russ,
I didn't try to reverse a commercial product, just tried to start a discussion about filters, and maybe try to make the buffalo just a little bit better.
Or a least give the user more options than the two we currently have.
It could very well be that a filter you tried and didn't like to much would work wonderful in my setup...or the setup of an other buffalo user.
Just seeking some support....but alas.
Still a very very nice product especially combined with legato.
Emile
I didn't try to reverse a commercial product, just tried to start a discussion about filters, and maybe try to make the buffalo just a little bit better.
Or a least give the user more options than the two we currently have.
It could very well be that a filter you tried and didn't like to much would work wonderful in my setup...or the setup of an other buffalo user.
Just seeking some support....but alas.
Still a very very nice product especially combined with legato.
Emile
Hi Emile,
I don't mind discussing a "filter". Show me one to my and we will discuss it. It is not enough to know that one exists, I have to know more than that.
As for options, you have the option. 😎 The DAC can use any filter we please. We just need to create it.
I am not questioning your motives, I just would want to work from an idea to a solution, and not the other way around.
Cheers!
Russ
I don't mind discussing a "filter". Show me one to my and we will discuss it. It is not enough to know that one exists, I have to know more than that.
As for options, you have the option. 😎 The DAC can use any filter we please. We just need to create it.
I am not questioning your motives, I just would want to work from an idea to a solution, and not the other way around.
Cheers!
Russ
My...
understanding is that the ESS 9018 is programmable, allowing for custom designed digital filters to be used. There are many different ways to do digital filtering-the latest fashion is to make digital filters which reduce pre-ringing (Meridian, Ayre, Wolfson) or reduce pre-ringing and post ringing (Ayre). All digital filters come with various trade offs, like phase shifts, increased pre and/or post ringing, high frequenecy roll-off, increased leakage of alias products. The key is to balance the trade offs, in the service of the music, perhaps accepting a little phase shift, alias leakage, and high frequency roll-off to eliminate pre-ringing, as one example.
You can read about Ayre's MP filter approaches at their website, and this will give some explanation as to different types of filters.
understanding is that the ESS 9018 is programmable, allowing for custom designed digital filters to be used. There are many different ways to do digital filtering-the latest fashion is to make digital filters which reduce pre-ringing (Meridian, Ayre, Wolfson) or reduce pre-ringing and post ringing (Ayre). All digital filters come with various trade offs, like phase shifts, increased pre and/or post ringing, high frequenecy roll-off, increased leakage of alias products. The key is to balance the trade offs, in the service of the music, perhaps accepting a little phase shift, alias leakage, and high frequency roll-off to eliminate pre-ringing, as one example.
You can read about Ayre's MP filter approaches at their website, and this will give some explanation as to different types of filters.
It seems the default filters are linear phase. Having the characteristics of the linear phase, is it possible to generate a minimum phase equivalent with a tool like Matlab?
is that possible to leave the signal "unfiltered"? Any filter will introduce distorsions in time domain
...we don't listen to averages over time, we listen just in time!
Pietro
...we don't listen to averages over time, we listen just in time!
Pietro
I happen to know a tiny bit about filters. What are the constraints (taps, etc)?
I believe the filter has 512 taps. Damn maybe i should've singed up for that nda.
Two dollar pic controller with serial interface to a pc and connection to the dac...ultimate tweaking machine? Cheaper and more fun than that demo board.
Two dollar pic controller with serial interface to a pc and connection to the dac...ultimate tweaking machine? Cheaper and more fun than that demo board.
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Russ, thanks for the link to the traffo thread. For purpose of powering Buffalo DAC, will a Placid reg work on 12.5Vdc battery power?
Is it possible to use a single transformer to power both a palcid and a placid bp? If so what kind of transf is recommended?
While it is possible it is not advisable.
You can use one trafo that has 3 secondaries (not very common but can be made).
You can you one dual trafo and share the same secondary that is used for V+ on the bipolar supply for the digital supply. Be very careful here, if you use the other secondary you will make smoke.
You will need to make sure your trafo is sized appropriately in either case.
Unfortunately I am afraid if I persue this I am going to get into NDA trouble. 🙁
The short of it is all the info you need is in the DS.
I have created several filters using Octave. I have been reluctant to promote that feature for DIY until I get permission to discuss that portion of the datasheet.
Cheers!
Russ
Not like the competition can't get the data sheet. All they got to do is sign a NDA or have someone else do it.
I like how Microsoft manufactures everything in China, then expects the US government to go after the Chinese diplomatically for all the software piracy.
I like how Microsoft manufactures everything in China, then expects the US government to go after the Chinese diplomatically for all the software piracy.
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