VS1033 Datasheet, PDF (29/70 Pages) List of Unclassifed Manufacturers – MP3/AAC/WMA/MIDI AUDIO CODEC

VLSI
Solution ^y
VS1033a PRELIMINARY
VS1033A
8. FUNCTIONAL DESCRIPTION
8.2.7 Supported MIDI Formats
General MIDI and SP-MIDI format 0 files are played. Format 1 and 2 files must be converted to format
0 by the user. The maximum simultaneous polyphony is 40. Actual polyphony depends on the internal
clock rate (which is user-selectable), the instruments used, whether the reverb effect is enabled, and
the possible global postprocessing effects enabled, such as bass and treble enhancers. The polyphony
restriction algorithm makes use of the SP-MIDI MIP table, if present.
36.86 MHz (3.0× input clock) achieves 16-26 simultaneous sustained notes. The instantaneous amount
of notes can be larger. 36 MHz is a fair compromise between power consumption and quality, but higher
clocks can be used to increase the polyphony.
Reverb effect can be controlled by the user. In addition to reverb automatic and reverb off modes, 14
different decay times can be selected. These roughly correspond to different room sizes. Also, each
midi song decides how much effect each instrument gets. Because the reverb effect uses about 4 MHz of
processing power the automatic control enables reverb only when the internal clock is at least 3.0×.
31 new instruments have been implemented in addition to the 36 that are available in VS1003.
Melodic
piano
vibraphone
organ
guitar
distortion guitar
bass
violin
strings
trumpet
sax
flute
lead
pad
steeldrum
VS1003
Effect
reverse cymbal
guitar fret noise
breath
seashore
bird tweet
telephone
helicopter
applause
gunshot
Percussion
bass drum
snare
closed hihat
open hihat
high tom
low tom
crash cymbal 2
ride cymbal
tambourine
high conga
low conga
maracas
claves
New in VS1033
Melodic
Percussion
slap bass 1
synth bass 1
synth bass 2
church organ
guitar (nylon)
high mid tom
low mid tom
high floor tom
low floor tom
crash cymbal 1
choir aahs
pizzicato strings
square lead
chiff lead
fifths lead
bass lead
warm pad
polysynth
sweep pad
wood block
cow bell
open triangle
mute triangle
long whistle
short whistle
side stick
hand clap
cabasa
low wood block
high wood block
castanets
Version 0.6, 2005-01-05
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