Filter brewing for the Soekris R2R - Page 136 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 11th January 2017, 07:22 PM   #1351
soekris is offline soekris  Denmark
diyAudio Member
 
Join Date: Jun 2009
Quote:
Originally Posted by levelUP View Post
batteries should be without center tap
but the scheme become little bit complex, it's easier with 3,2V instead of 4V
Yes, floating supplies will do, just not shown like that on your earlier drawing....
__________________
Søren
  Reply With Quote
Old 23rd January 2017, 12:09 PM   #1352
diyAudio Member
 
oneoclock's Avatar
 
Join Date: Oct 2010
I have been asked for the TXT of the filter because people need to ecualize and use DSD. I try to explain what I've done by putting together filters made by Soekris and Paul. Hoping they not to be bothered by the use of this. Otherwise, the administrator could deletes them please.

F4 is the first that provides Soekris by default. Soekris Linear Phase, 44.1KHz. 0-19.7Khz -1dB 22.3Khz -150dB. The sound seems similar to the integrated commercial DAC. It has a large slope of attenuation and produces an impulsive response of pre- and post ringing and poor phase response at high frequencies.

F5 is "EQHQ_lpbr_b4" Linear Fase published by Paul that has an even greater slope of attenuation. But its the sweetest and most pleasant sound of all filters. It produces a much better impulse response than the F4 with less ringing and a much better phase response at high frequencies. Unlike this filter published by Paul at frequencies above 88.2 Khz, 96 Khz, which dropped from 20 Khz. approximately, I performed the calculations in Excel by decimating and calculating attenuation in the impulse response to 88.2, 96, 192 ... Khz. Etc. So the attenuation at these frequencies is close to half of the sampling frequency. I estimate that: 88.2 Khz 0-40.9 Khz + -0.00000005 dB, 45 Khz -174 dB 96.0 Khz, 0-44.5 Khz + -0.00000005 dB, 48.9 Khz -174 dB The audio pass over 40 Khz. My bat pet are happy.

F7 is a NOS filter. Although some people have commented that DAM DAC an oversampling occurs in the signal. Is not true. This DAC repeat N times the signal without any skip or switching defect in each repetition, it is easily observable on the oscilloscope that the output is a perfect NOS filter with signal identical to that of any other NOS. The NOS have qualities and defects. The impulse response is perfect there is no phase variation of the high frequencies, the percussions and attacks instruments is very natural. But also the progressive attenuation of the signal about 1 Khz. produces a dark sound.

F6 is a filter published by Paul "C128dp Linear Phase NYQUIST" is the most similar to a NOS filter, only uses 8 samples at the front and 8 samples at the back, and the weight of the samples decays very quickly. The impulsive response is perfect. It is the closest to NOS but with the quality of having a flat response to almost 19 Khz. It also has a perfect phase up to high frequencies. And it also keeps zeros every N values in the impulse response which means that it reproduces exactly the same samples as the original signal, which filters F4 and F5 do not. They are several things that I wanted and this filter make. That I like most of how the percussions sound and instruments attacks. The loudspeakers in my house are temporal aligned and have a perfect impulsive response so this filter makes a difference to F4 and F5. Very similar to F7 but with trebles. I have also done with Excel 88.2, 96 Khz and above, decimating and calculating the attenuation from the original to 44 and 48 Khz. Similar in F2 filters.
Attached Files
File Type: zip 1021filt.106.zip (136.1 KB, 22 views)

Last edited by oneoclock; 23rd January 2017 at 12:15 PM.
  Reply With Quote
Old 23rd January 2017, 12:29 PM   #1353
diyAudio Member
 
oneoclock's Avatar
 
Join Date: Oct 2010
This reads better.
Attached Files
File Type: zip 1021filt.106.zip (136.2 KB, 68 views)
  Reply With Quote
Old 23rd January 2017, 02:22 PM   #1354
TNT is offline TNT  Sweden
diyAudio Member
 
Join Date: Apr 2003
Location: Sweden
Have you considered a "F5" with for example the filter for Fs=96khz:

a) Keeping same steepness but start filtering from 30kHz for higher attenuation at Fs.
b) use less steep filter for same attenuation at Fs.

a) is probably the most interesting option of the two.

Bat pet still quite happy. Master even more happy?

//
__________________
More distortion to the people!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Soekris 's DAC implementations Eldam Digital Line Level 1031 19th February 2017 10:38 AM
Sold: Soekris DAM1021 R2R DAC Eldam Swap Meet 6 6th February 2015 08:23 AM
24-bit R2R DAC using miltiple 16/18/20-bit R2R chips Marek Digital Source 21 1st April 2011 10:05 PM
project brewing in my head, challenging, but seem like a good way to try new concepts lemans23 Multi-Way 26 11th October 2005 01:29 PM


New To Site? Need Help?

All times are GMT. The time now is 07:47 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki