VS1003 Просмотр технического описания (PDF) - Unspecified

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производитель

VS1003

MP3/WMA AUDIO CODEC

Unspecified 

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

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 and 3 for VS1003.

SS_APDOWN2 controls analog driver powerdown. Normally this bit is controlled by the sys-

tem firmware. 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 en-

hancement 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: 1.09, 2018-03-16

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