Creative SOUND BLASTER PRO User Reference Manual page 143

SOUNDBLASTER^
Appendix A
General
New Mmusicvoices
Specifications ■
New FM OPL3 music chips using four opera or voices provides
enhanced sound.
■ Frequency Modula ion sound genera ion for realis ic sounds
■ Compa ible wi h previous versions, he OPL3 has nine melody
and five percussion sounds suppor ed by numerous games and
en er ainmen sof ware. In addi ion, he OPL3 has 15 melodies
using wo opera ors plus five percussion sounds, or six melodies
using four opera ors, hree melodies using wo opera ors plus five
percussion sounds.
■ Eigh selec able waveforms.
Stereo Digitized voice channel (2x8 bi DAC)
□ Provides ou pu of sound sampled from he real world — speech,
special effec s, animal sounds, hunders orm can be easily
reproduced on hese s ereo DAC channels.
Programmable sampling rate
■ 4KHz o 44.1 KHz-mono
■ 1
1 KHz and 22.05KHz - s ereo
DAC Transfer modes:
■ Direc mode - direc single by e ransfer by CPU
■ DMA mode - No CPU in erven ion/overhead required
Compression schemes:
■ 8-bi da a , no compression
■ 2 o 1 compression: 4-bi ADPCM, hardware decompression
■ 3 o 1 compression: 2.6-bi ADPCM, hardware decompression
■ 4 o 1 compression: 2-bi ADPCM, hardware decompression
Appendixes A - 3