參數(shù)資料
型號: VS1003
廠商: Electronic Theatre Controls, Inc.
元件分類: Codec
英文描述: MP3 / WMA AUDIO CODEC
中文描述: MP3播放/ WMA音頻編解碼器
文件頁數(shù): 26/57頁
文件大小: 456K
代理商: VS1003
VLSI
Solution
y
VS1003 PRELIMINARY
VS1003
8. FUNCTIONAL DESCRIPTION
8.2.4
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, and the possible postprocessing effects en-
abled, such as bass and treble enhancers. The polyphony restriction algorithm makes use of the SP-MIDI
MIP table, if present.
36.86 MHz (
3
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.
VS1003Bimplements36distinctinstruments. Eachmelodic, effect, andpercussioninstrumentismapped
into one of these instruments.
VS1003B
Effect
reverse cymbal
guitar fret noise
breath
seashore
bird tweet
telephone
helicopter
applause
gunshot
Melodic
piano
vibraphone
organ
guitar
distortion guitar
bass
violin
strings
trumpet
sax
flute
lead
pad
steeldrum
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 0.92,
2005-06-07
26
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