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MCUdude / SigmaDSP

A versatile Arduino library for interfacing with the ADAU1401, ADAU1701 and ADAU1702 audio DSPs
GNU Lesser General Public License v3.0
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Help cascading 2nd order filters to form 6th order filter #25

Closed SitrucL closed 2 years ago

SitrucL commented 2 years ago

Hi,

I've been attempting to implement 6th order filters using this library but haven't had any success. I've attached a screenshot of my sigma program and I know the program works as I've tested it using SigmaDSP and a programmer.

image

I'm struggling to figure out how to initialise the stacked EQ bands within the code. Based on the examples I assumed I could do something along the lines of this for each half of my filter:

    dsp.EQsecondOrder(MOD_LOW_D_ALG0_STAGE0_B0_ADDR, Low_D);
    dsp.EQsecondOrder(MOD_LOW_D_2_ALG0_STAGE0_B0_ADDR, Low_D_2);
    dsp.EQsecondOrder(MOD_LOW_D_3_ALG0_STAGE0_B0_ADDR, Low_D_3);

image

image

However this hasnt worked as expected - the dsp just emits a high frequency sound and the occasional pop when trying to control it via an MCU (adjusting gain or muting the EQ bands) . Is anyone able to advise on how to proceed or see anything I've done wrong from the screenshots?

Let me know if I need to attach more info & thanks in advance

SitrucL commented 2 years ago

Closing this one as I've come to the realisation that it was a hardware/setup related issue