Strange noise in beeper
Issue #4
resolved
When playing a beeper from .ay snapshot, there is a strange remarkable background noise. It's best heard on a first tune from the attachment. Please compare it to Unreal emulator or latest AyEmul.
Comments (6)
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From the other side, when comparing to AYEmul, I can say that AyEmul has a little better resulting sound in this very melody. AYEmul has two interpolation types: Averager - sounds similar to zxtune FIR-filter - sounds better in this melody
I think that I will ask Yerzmyey to make a direct recording from real hardware to compare which one is more accurate.
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zxtune uses lightweight 2-order filter optimized for performance. ayemul uses much more heavy filter.
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Thanks to Yerzmyey, we now have a recording from a real hardware (TR-DOS version) http://www.sendspace.com/file/x27uvc
If a heavier filter would fix the problem, then we surely need this feature in future.
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Workaround is to set ay frequency to 8MHz (core.aym.frequency=8000000) for beeper-only modules.
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- changed status to resolved
Fixed in r3120
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Seems to be no problem - it's related to interpolation only.