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TAS5508APAGG4 Datasheet(PDF) 30 Page - Texas Instruments

Part No. TAS5508APAGG4
Description  8 Channel Digital Audio PWM Processor
Download  99 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TAS5508APAGG4 Datasheet(HTML) 30 Page - Texas Instruments

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Introduction
22
SLES119 − September 2004
TAS5508A
The TAS5508A has a single set of loudness controls for the eight channels. In 6-channel mode loudness is
available to the six speaker outputs and also the line outputs. The loudness control input uses the Maximum
individual master volume (V) to control the loudness that is applied to all channels. In 192-kHz and 176.4-kHz
modes, the loudness function is active only for channels 1, 2, and 8.
+
x
x
Audio In
Audio Out
Loudness Function = f (V)
V
x
V
Loudness
Biquad
H(Z)
Figure 1−17. Loudness Compensation Functional Block Diagram
Loudness Function = f (V) = G x [2 [(Log V) x LG + LO]] + O
or alternatively,
Loudness Function = f (V) = G x [V LG x 2LO] + O
For example, for the default values LG = −0.5, LO = 0.0, G = 1.0, and O = 0.0 then:
Loudness Function = 1 / SQRT (V) which is the recommended transfer function for loudness. So,
Audio Out = (Audio In) x V + H (Z) x SQRT (V). Other transfer functions are possible.
Table 1−6. Default Loudness Compensation Parameters
LOUDNESS
DESCRIPTION
USAGE
DATA
I2C
SUB ADD
DEFAULT
LOUDNESS
TERM
DESCRIPTION
USAGE
DATA
FORMAT
SUB-ADD
RESS
HEX
FLOAT
V
Max volume
Gains audio
5.23
NA
NA
NA
Log V
Log2 (max volume)
Loudness function
5.23
NA
00000000
0.0
H (Z)
Loudness biquad
Controls shape of
Loudness curves
5.23
0x95
b0 = 0000D513
b1 = 00000000
b2 = 0FFF2AED
a1 = 00FE5045
a2 = 0F81AA27
b0 = 0.006503
b1 = 0
b2 = −0.006503
a1 = 1.986825
a2 = −0.986995
LG
Gain (log space)
Loudness function
5.23
0x91
FFC00000
−0.5
LO
Offset (log space)
Loudness function
25.23
0x92
00000000
0
G
Gain
Switch to enable
Loudness (ON = 1,
OFF = 0)
5.23
0x93
00000000
0
O
Offset
Provides offset
25.23
0x94
00000000
0


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