Filter brewing for the Soekris R2R

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D

djangoherbert

Member
Joined 2018
Kip Hanrahan

spzzzzkt said:
This is just the last filter with a bunch of quick n dirty Nyquist filters added at the higher sample rates.

I haven't really made any effort to optimise or tweak beyond widening the transition band. With a bit of time and thought I can make up a better batch but for the moment I'll upload the "Just For Jaffar" higher rate filters.

Done a quick test with my limited selection of hi-res:
Kip Hanrahan - Coup de Tete (88.2/24)
Kraftwerk - Minimum Maximum (88.2/24)
Miles Davis - Kind of Blue (192/24)

Sounds fine...
Click to expand...
KIP HANRAHAN high res: would it be possible for you to send me Coup de tete (and maybe Desire develops an edge by Kip) via dropbox, wetransfer or any other link, if I pay you? - I live in Austria and wanted to buy the album at hdtracks.com, but due to country restrictions (stupid!!! to release an album and to limit the availability) I couldn't do so...
my mail address is youareveryundude@gmail.com
 
J

janho12345

Member
Joined 2016
Hello,

is there something different when downloading filters to dam1121?


I have a filter batch thats working on my dam1021,
I downloaded it to the dam1121, when I list all filters feedback says all my filters are there, and I don't get a complaint when changing filters, but when I ask for current filter, there is only:


debian@beaglebone:~$ sudo python /usr/local/lib/python2.7/dist-packages/dam1021.py -a
INFO:dam1021:
FIR filters:
Bank 01:
FIR1: type(04) C128dp Linear Phase NYQUIST, Interpolation 16 SAMPLES, 44.1Khz
FIR1: type(04) C128dp Linear Phase NYQUIST, Interpolation 16 SAMPLES, 48 Khz
FIR1: type(04) Bypass FIR1. 352.8Khz.
FIR1: type(04) Bypass FIR1, 384 Khz.
FIR2: type(08) C128dp Linear Phase NYQUIST FIR2, Interpolation 16 SAMPLES
FIR2: type(08) C128dp Linear Phase NYQUIST FIR2, Interpolation 16 SAMPLES
Bank 02:
FIR1: type(05) LINEAR INT FIR1, 44.1 Khz Samplerate, Linear Interpolation
FIR1: type(05) LINEAR INT FIR1, 48 Khz Samplerate, Linear Interpolation
FIR1: type(05) LINEAR INT FIR1, 352.8 Khz Samplerate, Bypass
FIR1: type(05) LINEAR INT FIR1, 384 Khz Samplerate, Bypass
FIR2: type(09) LINEAR INT FIR2, 384 Khz Samplerate, Linear Interpolation
FIR2: type(09) LINEAR INT FIR2, 352 Khz Samplerate, Linear Interpolation
Bank 03:
FIR1: type(06) QUASIAPO FIR1, 44.1 Khz Samplerate, 0-19 Khz +- 0.000002 db, 23.35 Khz -170d
FIR1: type(06) QUASIAPO FIR1, 48 Khz Samplerate 0-21 Khz +- 0.01 db, 28 Khz -110db
FIR1: type(06) QUASI APO FIR1, 352.8 Khz Samplerate, Bypass
FIR1: type(06) QUASI APO FIR1, 384 Khz Samplerate, Bypass
FIR2: type(10) QUASIAPO FIR2, 384 Khz Samplerate 0-100 Khz +- 0.01 db, 240 Khz -80db
FIR2: type(10) QUASIAPO FIR2, 352 Khz Samplerate 0-50 Khz +- 0.000002 db, 300 Khz -170 db
Bank 04:
FIR1: type(07) NEWNOS FIR1, 44.1 Khz.
FIR1: type(07) NEWNOS FIR1, 48 Khz.
FIR1: type(07) NEWNOS FIR1, 352.8 Khz Samplerate, Bypass
FIR1: type(07) NEWNOS FIR1, 384 Khz Samplerate, Bypass
FIR2: type(11) NEWNOS FIR2
FIR2: type(11) NEWNOS FIR2
IIR filters:
type(30) Deemphasis IIR, 352.8 Ksps, 50/15 uS
type(30) Deemphasis IIR, 384 Ksps, 50/15 uS
debian@beaglebone:~$ sudo python /usr/local/lib/python2.7/dist-packages/dam1021.py -f 1
INFO:dam1021:Current filter set is 1
debian@beaglebone:~$ sudo python /usr/local/lib/python2.7/dist-packages/dam1021.py -c
INFO:dam1021:
FIR filters:
IIR filters:





I am using Beaglebone black (python library for dam1021) via an isolator to two dam1121s only one TXD (of dam1121) is connected.


I'm stuck here, please help!
 
D

derekr

Member
Joined 2009
Don't think the 1021 filter pack is compatible with the 1121. And, to the best of my knowledge, there's no available file with current 1121 filters.

What persuaded you to use a file clearly labelled 1021 with the 1121??

Your best bet would be to contact Søren and ask a question.....(and hope the weather in Denmark has changed for the worst!!!)
 
Last edited:
J

janho12345

Member
Joined 2016
derekr said:
Don't think the 1021 filter pack is compatible with the 1121. And, to the best of my knowledge, there's no available file with current 1121 filters.

What persuaded you to use a file clearly labelled 1021 with the 1121??

Your best bet would be to contact Søren and ask a question.....(and hope the weather in Denmark has changed for the worst!!!)
Click to expand...



:confused:


Here's an abstract from 1121 manual:


"All filters are using 32 bit coefficients, with up to 67 bit MAC accumulator. The filter file format is the same as used in the dam1021, the files are available at http://www.soekris.dk"
 
D

derekr

Member
Joined 2009
soekris said:
dam1021 and dam1121 use the exact same filter file. I have no idea what janho12345 is doing and the filter file is not even the soekris one....

Both the mkrom utility and the boards firmware only do some basic checks, if you're not careful you can easily screw something up....
Click to expand...

So it is possible to upload the 1021 full to an 1121? Or just the filter file?
 
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