Go Back   Home > Forums > >

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

Analog Delta-Sigma interpolation DAC
Analog Delta-Sigma interpolation DAC
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
Old Today, 07:08 AM   #401
kokoriantz is offline kokoriantz  Lebanon
diyAudio Member
 
Join Date: Dec 2015
Location: south east asia
20 samples didn't make anything better, the image is at -28db. It looks the 30 samples is the best.
20samples.JPG
  Reply With Quote
Old Today, 07:40 AM   #402
Hans Polak is online now Hans Polak  Netherlands
diyAudio Member
 
Join Date: Mar 2005
Location: Blaricum
With 30 point plus sophisticated post interpolation you have found a very nice optimum.
You canít escape physics, when you improve on one aspect, you wil lose somewhere else.

Hans
  Reply With Quote
Old Today, 11:32 AM   #403
kokoriantz is offline kokoriantz  Lebanon
diyAudio Member
 
Join Date: Dec 2015
Location: south east asia
I will try to interpolate the midpoints of the derivatives, by this the sinc ringingings get subjected to delta sigma filter. After all I am interpolating the cubic spline of the derivatives and no more that of the data.
I will also use the heterodyne to add instead of filtering the 68k-88khz images.
There is still lot to do.
  Reply With Quote
Old Today, 01:49 PM   #404
Hans Polak is online now Hans Polak  Netherlands
diyAudio Member
 
Join Date: Mar 2005
Location: Blaricum
I tried a 36point Blackman Harris window while not using the outer 4 points because they were practically zero, so filter length stayed still the same as before.
Below, at the left Blackman Harris in Red t and the Hamming with 0,45% gain at the right in Blue.

FR is now a bit smoother around 20Khz, but stopband is much deeper that the Hamming window with 0,45% gain.
Suppression at 24.1Khz is a bit less, but to be realistic, at this frequency the spectral content of music is quite a bit lower, see second image.

Hans
.
Attached Images
File Type: jpg Blackman Harris.jpg (586.4 KB, 12 views)
File Type: jpg Frequency content.jpg (283.7 KB, 13 views)
  Reply to this post

Reply


Analog Delta-Sigma interpolation DACHide this!Advertise here!
Thread Tools

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Philips tda1305 (hybrid multi-bit/bitstream DAC with interpolation) 1z2a3y Digital Line Level 37 22nd January 2021 01:02 AM
High quality parts used delta-sigma dac vs cheap parts used r2r ladder dac Esotar01 Digital Line Level 2 6th May 2016 01:50 AM
Question about DAC interpolation cuallito Digital Line Level 1 29th April 2011 12:11 AM
Delta-current linear-interpolation DAC wimms Digital Source 86 4th November 2004 03:05 AM


New To Site? Need Help?

All times are GMT. The time now is 03:58 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki