VS1033C Datasheet, PDF (29/74 Pages) List of Unclassifed Manufacturers – MP3/AAC/WMA/MIDI AUDIO CODEC

VLSI
Solution ^y
VS1033c PRELIMINARY
VS1033C
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 or EarSpeaker spatial
processing. 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×.
When EarSpeaker spatial processing is active, MIDI reverb is not used.
New instruments have been implemented in addition to the 36 that are available in VS1003. VS1033c
now has unique instruments in the whole GM1 instrument set and one bank of GM2 percussions.
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
Version 0.9, 2006-08-15
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