參數(shù)資料
型號(hào)： TDA9855WP
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： I2C-bus controlled BTSC stereo/SAP decoder and audio processor
中文描述： SPECIALTY CONSUMER CIRCUIT, PQCC68
文件頁(yè)數(shù)： 38/52頁(yè)
文件大?。?/td> 345K
代理商： TDA9855WP
1997 Nov 04
38
Philips Semiconductors
Product specification
I
2
C-bus controlled BTSC stereo/SAP
decoder and audio processor
TDA9855
Loudness filter calculation example
Figure 12 shows the basic loudness circuit with an
external low-pass filter application. R1 allows an
attenuation range of 21 dB while the boost is determined
by the gain stage V
1
. Both result in a loudness control
range of +16 to
12 dB.
Defining f
ref
as the frequency where the level does not
change while switching loudness on/off. The external
resistor R3 for f
ref
→ ∞
can be calculated as:
G
v
20
---10
=
. With G
v
=
21 dB and R1 = 33 k
,
R3 = 3.2 k
is generated.
For the low-pass filter characteristic the value of the
external capacitor C1 can be determined by setting a
specific boost for a defined frequency and referring the
gain to G
v
at f
ref
as indicated above.
For example: 3 dB boost at f = 1 kHz
G
v
= G
v(ref)
+ 3 dB =
18 dB; f = 1 kHz and C1 = 100 nF.
If a loudness characteristic with additional high frequency
boost is desired, an additional high-pass section has to be
included in the external filter circuit as indicated in the
block diagram. A filter configuration that provides
AC coupling avoids offset voltage problems.
Figure 13 shows an example of the loudness circuit with
bass and treble boost.
R3
R1
------
1
10
G
v
20
------
–
ω
C1
(
)
j
--R1
R3
+
)
10
G
v
20
G
v
20
------
R3
–
×
1
10
------
–
=
Fig.12 Basic loudness circuit.
handbook, halfpage
MHA838
V1
R2
R1
33 k
VIX
LOX
C1
R3
Fig.13 Loudness circuit with bass and treble boost.
handbook, halfpage
MHA839
V1
R2
R1
33 k
VIX
LOX
20 k
2.2 k
220 nF
8.2 nF
150
nF
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