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Raspberry Pi with Piano2.1 DAC DSP and Volumio2
Raspberry Pi with Piano2.1 DAC DSP and Volumio2
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Old 29th October 2017, 10:35 AM   #41
hkknudsen is offline hkknudsen
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Originally Posted by DonVK View Post
Thanks for the URL, I'll have a look at it. BruteFir2 also has up sampling in the plugin. I typically stay with one sample rate (48KHz) as I move between a PC and the RPI to compare the filters.
Just a bit additional info; it uses brutefir and sox and the usual suspects under the hood, but what I like more and more is the flexibility. If I upload just a 48KHz filter and activate upsampling 48->96 and also 48->192 I can test the sound of 48, 96 and 192 by just selecting the relevant song on the client (so, within seconds), they're all available. If I want to test the difference between 2 filters I can upload both and again switch in seconds. And also the possibility to try the different clients with the same convolving is great. But yea, many options these days
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Old 13th January 2018, 10:10 PM   #42
DonVK is offline DonVK  Canada
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Default Sample Allo PWF for TI GDE

@InorganicMatter : These are GDE PWF's for the stereo and sub outputs. Includes the configurations for all the sample rates.
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File Type: zip stereo_8x.zip (123.8 KB, 5 views)
File Type: zip stereoSubwoofer_8x.zip (126.2 KB, 6 views)
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Old 16th January 2018, 12:55 PM   #43
InorganicMatter is offline InorganicMatter
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Hi DonVK, thank you! I won't have much time to play around this week, but might be posting here for some more help next weekend... Quick question: what is the purpose of the "click remove" block in the subwoofer PWF? Also, what do the different output multipliers (4x, 8x, etc) represent? Finally, in the past you seem to have mentioned a Java app for converting the output files to bin format, is that available still?

Last edited by InorganicMatter; 16th January 2018 at 01:03 PM.
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Old 16th January 2018, 02:34 PM   #44
DonVK is offline DonVK  Canada
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The sample files are what Allo gave me. They are very useful because if your tool process is working you should be able to replicate the stock bin files. They also have embedded configurations to allow you to generate the suite of sample rate files for a given design.

I use a java converter to translate TI "cfg" to Allo "bin" files. I like to develop on a single platform and my TI GDE license runs on Windows. The converter is in this thread at Raspberry Pi with Piano2.1 DAC DSP and Volumio2

The 1x,4x,8x output muxes are used to "oversample" outputs. They are referenced to the base sample clock. So if base=44.1KHz, the selecting 8x would update the output interpolation filter at 352.8KHz.

When you are designing low freq filters you need to be careful about how the filter coefficients are represented. You should use extended precision, but it looks like Allo used default precision. At LFs, the coeffs are nearly =1 (ie. 0.99999754) and any rounding error will cause the filter to act like an integrator. So the outputs will slowly saturate (DC shift) and "bounce" against the min/max output causing noise. I think that is why the click block was put in. I have simulated the LP IIR filters with "rounded" coeffs and that is the behaviour I see. When I get a better solution for sub outputs I'll post it.
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