Commodore AMIGA

ANALOG FILTER TEST

 

This simple test will compare some samples recorded straight from an amiga 500 with filter enabled and disabled.

 

 

FOREWORD the AMIGA sound processor is "PAULA" MOS8364 which is able to generate 4 PCM voices at 8 bits resolution with a frequency rate up to 27/28 kHz.

 

AMIGA FILTER

The Paula ouputs are chained to a static analog 2-poles Butterworth low-pass filter for the whole 4 channels with an attenuation about 7000 Hz. Amiga fixed LPF can be deactivated by software (in this case the red LED turns OFF or dimes depending on Amiga model). Click for bigger picture

 

TEST A just recorderded a Roland TR808 analog drum machine with an amiga 500:

filter enabled filter disabled     A/B SPECTRAL

 

TEST B playing a piano sample from soundtracker library on 3 octaves, first with filter on then disabled.

piano sample octave1: first enable piano sample octave2: first enable piano sample octave3: first enable     A/B SPECTRAL

 

TEST C just alternating the filter on the soundtrack from Shadow of the Beast II by Psygnosis

alternating filter on and off     A/B SPECTRAL

 

GALLERY: