Roland 5100011346 -01 用户手册

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页码 120
62
Using the SD-50 as an SMF/Audio Player
What is SMF?
SMF (Standard MIDI File) is a data format that was created in order to standardize music data across 
manufacturers. Many collections of SMF music data are available in a wide range of musical styles for listening 
enjoyment, instrument practice, or karaoke.
SMF/audio files that can be played
* You can’t use SMF/audio file playback employing USB memory while the SD-50 is connected to a computer.
* Some utility functions (p. 74) cannot be executed while the player is playing back a song.
SMF
MID
Format
0 or 1
* SMF format 1 limits the tracks that can be played back.
File size
Maximum of approximately 240 KB 
(differs slightly depending on the content of the SMF)
System exclusive
Packet size of 512 bytes or less
Audio files
WAV/AIFF
Sampling frequency
44.1 kHz
Bit depth
8/16/24 bits
MP3
Format
MPEG-1 audio layer 3
Sampling frequency
44.1 kHz
Bit rate
32/40/48/56/64/80/96/112/128/160/192/224/256/320 kbps, 
VBR (Variable Bit Rate)
SD-50_e.book  62 ページ  2010年1月25日 月曜日 午前10時52分