TAS5707
SLOS556–NOVEMBER 2008........................................................................................................................................................................................... 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.
The DRC input/output diagram is shown in Figure 31.
K
1:1 Transfer Function
O
Implemented Transfer Function
T
Input Level (dB)
M0091-02
Professional-quality dynamic range compression automatically adjusts volume to flatten volume level.
• One DRC for left/right
• The 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 31. Dynamic Range Control
Attack
and
Decay
Filters
Energy
Filter
Compression
Control
Audio Input
DRC Coefficient
a, w
T, K, O
aa, wa / ad, wd
DRC
0x3A
0x40, 0x41, 0x42
0x3B / 0x3C
Alpha Filter Structure
S
a
Z–1
w
NOTE:
w = 1 – a
B0265-01
Figure 32. DRC Structure
28
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