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DAC + DSP and REW

Richard Harvey

April 09, 2019 09:15

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Hi,

I have just received my DAC + DSP. Congratulations on introducing a wonderful addition to the HiFiBerry product lineup.

I am using an RPi 3 Model A+ with HiFiBerryOS 20190131.

Before applying a filter .txt file, referring to the REW-Basics guide, do I need to first install the profile at

dsptoolkit install-profile https://raw.githubusercontent.com/hifiberry/hifiberry-dsp/master/sample_files/xml/dacdsp-default.xml

Also, what directory is the filter.txt file copied into?

I copied my test filter file into /boot using scp but running
 dsptoolkit apply-rew-filters reports file not found error 21

I must have made a newbie error somewhere. Any help from the team would be appreciated.

Regards,
Richard.

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5 comments

• 0
  
  HiFiBerry team April 09, 2019 13:09

  Hi,

  yes, you first need to install a DSP profile. The reason for this is simply that DSPtoolkit doesn't know what program is installed on the DSP and therefore can't change parameters on the DSP.
  
  The filter.txt file can reside anywhere on the system. It doesn't even have to be named filter.txt. Just use the full path name (including directory) or put it into the current directory.

  Best regards,
  Daniel

• 0
  
  Richard Harvey April 09, 2019 13:55

  Thanks Daniel,

  I'd forgotten to cd into /boot. Filters file loads but results in:

  "18 filters given, but filter bank has only 0.0 slots"

  What does this mean?

  Best regards,

  Richard.

• 0
  
  HiFiBerry team April 09, 2019 14:00

  That means that DSPToolkit doesn't find any filters in the DSP profile. Probably you did not install the profile using install-profile.

  Best regards,
  Daniel

• 0
  
  Richard Harvey April 09, 2019 14:36

  Hi Daniel,

  I used:

  dsptoolkit install-profile https://raw.githubusercontent.com/hifiberry/hifiberry-dsp/master/sample_files/xml/dacdsp-default.xml
  
  and received:
  
  "DSP profile https://raw.githubusercontent.com/hifiberry/hifiberry-dsp/master/sample_files/xml/dacdsp-default.xml installed"
  
  so would appear to be correct.
  
  My filter text file is same structure as your example in REW-Basics.
  
  I'll start afresh with a new SD card image.
  
  Best regards,
  Richard.

• 0
  
  Richard Harvey April 10, 2019 08:11

  Hi Daniel,

  All is well. Must have broken something in initial exploration. New HiFiBerryOS on SD card - everything went smoothly.

  Do you recommend a heatsink for DSP chip?

  Best regards,

  Richard.

  p.s. I ordered today a DAC/ADC add-on board. Having an analog input for the room eq is just what I need for my intended project.

  Wonderful tools for RPi audio enthusiasts !! :-)