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oric:ayt:rwc_resolutions

RWC Resolutions

The Resolutions RWC (Default Key fR whilst in the List Editor) sets the Resolution of the Volume and Noise resources and is provided with two parameters

Normally the AY sound chip is capable of producing 4 bit Volume resolution (0-15) and 5 bit Noise resolution (0-31). However through AYT's Resolution setting it is possible (through software dither rendering) to achieve a higher resolution. The synthesis acts at 200Hz(This may be settable in future versions of AYT). If SFX is set to 200Hz too then the render may sound corrupted. To use Resolutions it is recommended to reduce SFX frequency to 50Hz or slower.

  • Noise Resolution

The Noise resolution is by default 5 bit or 0-31 but with this setting it will be software rendered through a dithering technique to achieve 7 Bit resolution or 0-127. This will take effect in any Pattern that is assigned the noise sound source and its SFX (if it alters the pitch or note) but will not affect the Noise change in Effects (which act outside of sharing).

  • Volume Resolution

The Volume resolution is by default 4 bit or 0-15 but with this setting it will be software rendered through a dithering technique to achieve 6 Bit resolution or 0-63. This will be reflected in subsequent Patterns with the volume range (in the note entry) being raised to 0-63 but with less accuracy(steps of 4 instead of 1).

This will also take effect in any SFX that alters the note volume.

Raising the volume resolution may sound crackly on the real machine on louder volumes due to the logarythmic hardware volume levels.

How it works

The resolution on either resources is raised by 2 bits. The lower 2 bits specify a Dither pattern which alternates between the value held in the upper bits and the next value up. A 2 bit value of 0 will be represented by a raised volume pattern of 1 in 8 whereas a 2 bit value of 3 will be represented by a raised volume pattern of 1 in 2.

oric/ayt/rwc_resolutions.txt · Last modified: 2009/01/19 18:45 by twilighte