Rockbox General > Rockbox General Discussion

crossfeed

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jlo:

--- Quote ---What is Rockbox's "delay" in the crossfeed ?
--- End quote ---

Delay is the time delay between the left signal arriving at left ear and same signal arriving at right ear (ipsilateral and the contralateral signals), default value is 14 samples (about 0.35ms), which corresponds to delay between ears when listening to loudspeakers at about 30°. For more information , see :
http://www.ohl.to/audio-tools-and-thoughts/audio-softwares-and-vst-plugins/crossfeed-and-eq-for-headphones/

mkeroppi:
I mean the actual delay used. I've tried 14 on the VST and it doesn't sound quite the same. Looking at dsp.c doesn't seem to point to anything.

jlo:
I'm not sure but I think delay is hardcoded in dsp.c
--- Quote ---/* Wrap delay line index if bigger than delay line size */
        if (++di > 12)
            di = 0;
--- End quote ---
So I think delay is 13 samples (not 14, sorry).
Preglow will be able to confirm

mkeroppi:
That looks right, missed that part.

I'm not getting it why either. The Rockbox crossfeed definitely has a much cleaner sound, vocal sticks out more (the center channel). The algorithm looks simple enough though (maybe the LP filter is better implemented for the purpose?).

Right now using 6 samples delays (for best clean center versus imaging) and -5dB@10kHz EQ (again to clean the sound a bit) on the VST. It seems even unclear center makes things sound "bright". Other settings are the same as the default Rockbox crossfeed setting. Rockbox crossfeed just sounds "right" (imaging) default setting and without EQ, and cleaner.

mkeroppi:
Had some time and did some tests with the same file VST processed crossfeed off versus crossfeed on the same Rockbox, and can confirm the difference. It's definitely the difference of large clean layered sound of ER-4s but with a roomy mix versus smaller, and less cleaned, squashed sound. The room+details are distinctly good (usually one of the other), and I think that's what drawn me to Rockbox, and it's for doing transcriptions.

I wanted to go ahead and port the Rockbox code, but wanted to see if you can share your code, as I have done DSP in school, but not VST.

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