參數(shù)資料
型號: TAS3103DBTG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PDSO38
封裝: GREEN, PLASTIC, TSSOP-38
文件頁數(shù): 115/148頁
文件大?。?/td> 1247K
代理商: TAS3103DBTG4
310
3.4
Biquad Filters
There are a total of 73 biquad filters in the TAS3103. The breakout of the biquad filters per functional element is given
in Table 31.
Table 31. Biquad Filter Breakout
FUNCTION
BIQUAD FILTERS
SUBADDRESS
3D effects block
24
0x340x4B
Monaural channel CH1
12
0x4F0x5A
Monaural channel CH2
12
0x5B0x66
Monaural channel CH3
12
0x670x72
0xA6CH1
Loudness processing
3
0xABCH2
Loudness processing
3
0xB0CH3
Spectrum analyzer/VU meter
10
0xBC0xC5
All 73 biquad filters are second order direct form I structures. A block diagram of the structure of the biquad filter is
shown in Figure 311.
b 0
b 1
b 2
a1
a2
28
48
76
48
76
48
76
Magnitude
Truncation
48
z1
Σ
NOTE: All gain coefficients 5.23 numbers.
Biquad Filter Coefficient Subaddress Format
Biquad Filter Structure
m
s
b
S
Slave Addr
Ack Sub-Addr Ack
xxx
0000
Ack
xxxxxxxx
Ack
xxxxxxxx
Ack
xxxxxx
l
s
b
Ack
a1
m
s
b
xxx
0000
Ack
xxxxxxxx
Ack
xxxxxxxx
Ack
xxxxxx
l
s
b
Ack
a2
m
s
b
xxx
0000
Ack
xxxxxxxx
Ack
xxxxxxxx
Ack
xxxxxx
l
s
b
Ack
b0
m
s
b
xxx
0000
Ack
xxxxxxxx
Ack
xxxxxxxx
Ack
xxxxxx
l
s
b
Ack
b2
m
s
b
xxx
0000
Ack
xxxxxxxx
Ack
xxxxxxxx
Ack
xxxxxx
l
s
b
Ack
b1
NOTE: Each Biquad filter has one subaddress which contains the mixer gain coefficients a1, a2, b0, b1, b2
Figure 311. Biquad Filter Structure and Coefficient Subaddress Format
The transfer function for the biquad filter is given by:
V
OUT
(z)
V
IN
(z)
+
b
0 )
b
1
z*1
) b
2
z*2
1
* a
1
z*1
* a
2
z*2
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