VS1033 Datasheet, PDF(34/70 Page) List of Unclassifed Manufacturers

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VS1033 Datasheet, PDF (34/70 Pages) List of Unclassifed Manufacturers – MP3/AAC/WMA/MIDI AUDIO CODEC

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VLSI

Solution y

VS1033a PRELIMINARY

VS1033A

8. FUNCTIONAL DESCRIPTION

8.6.2 SCI STATUS (RW)

SCI STATUS contains information on the current status of VS1033 and lets the user shutdown the chip

without audio glitches.

Name

Bits Description

SS VER

SS APDOWN2

SS APDOWN1

SS AVOL

6:4 Version

3 Analog driver powerdown

2 Analog internal powerdown

1:0 Analog volume control

SS VER is 0 for VS1001, 1 for VS1011, 2 for VS1002, 3 for VS1003, and 5 for VS1033.

SS APDOWN2 controls analog driver powerdown. Normally this bit is controlled by the system ï¬rmware.

However, if the user wants to powerdown VS1033 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 ï¬rmware

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 ï¬rmware 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 userâs

preferences, and SB FREQLIMIT to roughly 1.5 times the lowest frequency the userâs 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 2.1 MIPS and Treble Control 1.2 MIPS at 44100 Hz sample rate. Both can be

on simultaneously.

Version 0.6, 2005-01-05

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