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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)： | 31/57頁 |
| 文件大小： | 456K |
| 代理商： | VS1003 |
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VLSI
Solution
y
VS1003 PRELIMINARY
VS1003
8. FUNCTIONAL DESCRIPTION
8.6.2
SCI STATUS (RW)
SCI STATUS contains information on the current status of VS1003 and lets the user shutdown the chip
without audio glitches.
Name
SS VER
SS APDOWN2
SS APDOWN1
SS AVOL
Bits
6:4
Description
Version
Analog driver powerdown
Analog internal powerdown
Analog volume control
3
2
1:0
SS VER is 0 for VS1001, 1 for VS1011, 2 for VS1002 and 3 for VS1003.
SS APDOWN2controlsanalogdriverpowerdown. Normallythisbitiscontrolledbythesystemfirmware.
However, if the user wants to powerdown VS1003 with a minimum power-off transient, turn this bit to
1, then wait for at least a few milliseconds before activating reset.
SS APDOWN1 controls internal analog powerdown. This bit is meant to be used by the system firmware
only.
SS AVOL is the analog volume control: 0 = -0 dB, 1 = -6 dB, 3 = -12 dB. This register is meant to be
used automatically by the system firmware only.
8.6.3
SCI BASS (RW)
Name
ST AMPLITUDE
ST FREQLIMIT
SB AMPLITUDE
SB FREQLIMIT
Bits
15:12
11:8
7:4
3:0
Description
Treble Control in 1.5 dB steps (-8..7, 0 = off)
Lower limit frequency in 1000 Hz steps (0..15)
Bass Enhancement in 1 dB steps (0..15, 0 = off)
Lower limit frequency in 10 Hz steps (2..15)
The Bass Enhancer VSBE is a powerful bass boosting DSP algorithm, which tries to take the most out
of the users earphones without causing clipping.
VSBE is activated when SB AMPLITUDE is non-zero. SB AMPLITUDE should be set to the user’s
preferences, and SB FREQLIMIT to roughly 1.5 times the lowest frequency the user’s audio system can
reproduce. For example setting SCI BASS to 0x00f6 will have 15 dB enhancement below 60 Hz.
Note: Because VSBE tries to avoid clipping, it gives the best bass boost with dynamical music material,
or when the playback volume is not set to maximum. It also does not create bass: the source material
must have some bass to begin with.
Treble Control VSTC is activated when ST AMPLITUDE is non-zero. For example setting SCI BASS
to 0x7a00 will have 10.5 dB treble enhancement at and above 10 kHz.
Bass Enhancer uses about 3.0 MIPS and Treble Control 1.2 MIPS at 44100 Hz sample rate. Both can be
on simultaneously.
Version 0.92,
2005-06-07
31
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相關(guān)代理商/技術(shù)參數(shù) |
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| VS1005 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:此產(chǎn)品是芬蘭VLSI剛剛研發(fā)成功的音頻編解碼芯片樣品 |
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