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DSP crossover, anomaly on start and song change
post Apr 28 2012, 03:43
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Joined: 28-April 12
Member No.: 99269


I have written a digital crossover dsp for three way speakers using fourth order Linkwitz-Riley filters and a low shelf filter for boosting the bass.
The version with hard coded frequencies and gains (no preset) works perfectly and sounds great.
I subsequently wrote a version with a preset allowing for user input.
It works; but, there is a clunk sound for a fraction of a second on start up and when a song change is forced.
The frequency display also shows full bars for a short time.
No anomaly is heard when songs change naturally.
I would like to understand the function calls that happen at those times to help debug this issue.
I am also unfamiliar with .dll debugging techniques.


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post May 2 2012, 18:10
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Member No.: 97951

Hi Ray_D,

I'm working on a GUI for crossover/EQ, and desperately seeking a way to simulate the EQ/crossover behavior on multichannel soundcard prior to going hardware (i plan to target PC, hardware DSP and classic analog circuits).

Foobar DSP plugin was my first choice, but i lost interest after trials with C and multichannel sound smile.gif

Could you please share your project, or implement a way of loading biquads into your signal chain? I guess you already use biquads for the crossover...

I can supply signal chained biquads file... Modifying biquads in realtime would be great!...

No signal splitting required, as each chain is being built from the endpoint, and all overlapping filters are duplicated in every chain.

I can graph phase/frequency response of the filters, add frequency response from file for every output for visualization, rearrange filter blocks in intuitive interface...

Some screenshots: http://s3t.it/coding/graphic-filter-designer/
Current build: http://s3t.it/data/uploads/dspsx05.zip

I can share source (i intended to share it when it'll become more-or-less useful than half-working biquad plotter smile.gif ).

This post has been edited by s3t: May 2 2012, 18:11
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