TAS5721 datasheet(56/71 Pages) TI1

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–1

AlphaFilterStructure

B0265-01

Energy

Filter

a w

T,K,O

DRC1

DRC2

0x3A

0x40,0x41,0x42

0x3B/0x3C

0x3E/0x3F

0x43,0x44,0x45

0x3D

Compression

Control

Attack

and

Decay

Filters

AudioInput

DRCCoefficient

NOTE:

=1 –

Input Level (dB)

M0091-02

1:1 TransferFunction

Implemented TransferFunction

TAS5721

SLOS739 – JULY 2012

www.ti.com

Dynamic Range Control (DRC)

The DRC scheme has a single threshold, offset, and slope (all programmable). There is one ganged DRC for the

left/right channels and one DRC for the subchannel.

The DRC input/output diagram is shown in Figure 66.

Refer to GDE software tool for more description on T, K, and O parameters.

Professional-quality dynamic range compression automatically adjusts volume to flatten volume level.

• Each DRC has adjustable threshold, offset, and compression levels.

• Programmable energy, attack, and decay time constants

• Transparent compression: compressors can attack fast enough to avoid apparent clipping before engaging,

and decay times can be set slow enough to avoid pumping.

Figure 66. Dynamic Range Control

T = 9.23 format, all other DRC coefficients are 3.23 format

Figure 67. DRC Structure

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