ADAU145x Superbass

fio Question

Apr 14, 2016 00:00

Hi,

working on a 1452 device running at 192kHz. Start pulse is set to Base_FS x 4 and system sampling rate is set to 192kHz. MCLK is 24.576MHz, pre-divider 8 and feedback divider 96. SigmaStudio Version: 3.12.4,1041

As soon as I activate the Superbass algorithm it completely cuts off frequencies lower than x-over.

Intensity and Bass Gain is set to 1 for testing.

If I lower the sampling frequency, the algorithm seems to work well.

Is there a known problem with this algorithm?

EDIT:
The mono and stereo superbass has a different behavior, but both won't work at 192kHz.

best regards,

lasse

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DaveThib Reply

Apr 22, 2016 00:00

Hello Lasse,

I reported it. I will let you know when I hear something about it.

Dave T

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ADIApproved Reply

May 17, 2016 00:00

Hello Lasse,

Could you please share the schematic which was used to test the super bass module at 192 KHz sampling rate .

Thanks,

Mazher

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fio Reply

May 17, 2016 00:00

Hi Mazher,

I tried to make a project based on EVAL-ADAU1452MINIZ.

Even at 48kHz the super bass algorithem seems to work incorrect.

As far as I understand the implementation, this should not work as a filter, just as an algorithm to ADD harmonic waves from content below x-over, based on the psychoacoustic effect of "missing fundamental"?

If you need any further information please contact me by mail.

But i just realized, the eval board has the same behavior at 48kHz.

..........................................

EVAL-ADAU1452MINIZ (48kHz), optical in -> analog out.

Sigma Studio 3.13. Build 1, Rev. 1614.
Dynamic Bass -> Stereo -> SW Slew optimized -> SuperBass.

Superbass x-over 100Hz, intensity 1, Gain 1.

Stimulus log sweep.

Blue: Superbass disabled.

Purple(4.5s sweep): Superbass enabled.

Light green(5s sweep): Superbass enabled.

Red(10s sweep): Superbass enabled.

Lasse

5ef748f22da736483cbc93fb909a7451.png-620x248.png

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