|Re: [hatari-devel] STe DMA sound|
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On 13/04/2018 at 10:18, Nicolas Pomarède wrote:
In dmaSnd.c at line 530, can you force "DmaSnd_LowPass = true" to see if the sound is better according to you ?
I have just forced that variable, and I can hear the effect. I opened 2 Hatari windows to clearly hear the difference. With that:Low-pass filter is definitely enabled on drums. The samples lost some resolution, as if a treeble button was turned down. The original Hatari sound was more pleasant. But I don't know which version is more accurate, this should be compared with real hardware.
*BUT* that didn't fix the issue! I can still hear the bogus-treeble which makes my ears bleeding. Those annoying frequencies are definitely above the low-pass filter.So something is trashing the sound at another level, adding unexpected high frequencies.
I attach a sample, recorded with "DmaSnd_LowPass = true". You can easily ear the annoying treeble. And with Audacity spectral analysis, you can even see it! There are bogus bars around 7 KHz.
Maybe they are added by something else? LMC1992 emulation? -- Vincent Rivière
Description: Wave audio
Description: PNG image
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