| Log Message: |
XO-1.75 - Implemented an upsampling filter using iwMMX instructions and used it to upsample the audio for the startup jingle, thus eliminating the aliasing that was occurring when trying to play 8khz audio directly. The XO-1.75's codec can play at 8khz, but it doesn't do antialiasing at the frequency, so the sound is bad.
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cpu/arm/firfilter.fth