參數(shù)資料
型號(hào)： TAS5508PAG
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： GREEN, PLASTIC, TQFP-64
文件頁(yè)數(shù)： 33/105頁(yè)
文件大小： 1286K
代理商： TAS5508PAG
f Frequency Hz
Gain
dB
10
20k
100
1k
G001
20
0
10
20
40
10
30
10k
2.10 Dynamic Range Control (DRC)
TAS5508
8-Channel Digital Audio PWM Processor
www.ti.com
SLES091D – FEBRUARY 2004 – REVISED JULY 2009
Table 2-7. Loudness Function Parameters
LOUDNESS
DESCRIPTION
USAGE
DATA
I2C
DEFAULT
TERM
FORMAT
SUB-
HEX
FLOAT
ADDRESS
H(Z)
Loudness biquad
Controls shape of
5.23
0x95
b0 = 0000 8ACE
b0 = 0.004236
Loudness curves
b1 = 0000 0000
b1 = 0
b2 = FFFF 7532
b2 = –0.004236
a1 = FF01 1951
a1 = –1.991415
a2 = 007E E914
a2 = 0.991488
LG
Loudness gain
Loudness function
5.23
0x91
FFC0 0000
–0.5
LO
Loudness offset
Loudness function
25.23
0x92
0000 0000
0
G
Gain
Switch to enable
5.23
0x93
0080 0000
1
loudness (ON = 1, OFF = 0)
O
Offset
25.23
0x94
0000 0000
0
See Figure 2-15 for the resulting loudness function at different gains.
Figure 2-15. Loudness Example Plots
DRC provides both compression and expansion capabilities over three separate and definable regions of
audio signal levels. Programmable threshold levels set the boundaries of the three regions. Within each of
the three regions, a distinct compression or expansion transfer function can be established and the slope
of each transfer function is determined by programmable parameters. The offset (boost or cut) at the two
boundaries defining the three regions can also be set by programmable offset coefficients. The DRC
implements the composite transfer function by computing a 5.23-format gain coefficient from each sample
output from the rms estimator. This gain coefficient is then applied to a mixer element, whose other input
is the audio data stream. The mixer output is the DRC-adjusted audio data.
There are two distinct DRC blocks in the TAS5508. DRC1 services channels 1–7 in the 8-channel mode
and channels 1–4 and 7 in the 6-channel mode. This DRC computes rms estimates of the audio data
streams on all channels that it controls. The estimates are then compared on a sample-by-sample basis
and the larger of the estimates is used to compute the compression/expansion gain coefficient. The gain
coefficient is then applied to the appropriate channel audio streams. DRC2 services only channel 8. This
DRC also computes an rms estimate of the signal level on channel 8 and this estimate is used to compute
the compression/expansion gain coefficient applied to the channel-8 audio stream.
Description
33
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