參數(shù)資料
型號(hào)： TC9470FN
廠商： Toshiba Corporation
英文描述： ?-? Modulation DA Converter with Built-in 8-Times Oversampling Digital Filter/Dynamic Digital Bass Boost/Analog Filter
中文描述： ？ - ？調(diào)制DA轉(zhuǎn)換器與內(nèi)置8時(shí)報(bào)采樣數(shù)字濾波器/動(dòng)態(tài)低音增強(qiáng)數(shù)字/模擬濾波器
文件頁(yè)數(shù)： 7/20頁(yè)
文件大?。?/td> 264K
代理商： TC9470FN
TC9470FN
2002-02-27
7
The digitalization of the de-emphasis filter eliminates the need for such external components as resistors,
condensers and analog switches. In addition to this, the coefficients are aligned to reduce error in the
de-emphasis filter characteristics.
The filter structure and characteristics are shown below.
5. Dynamic Digital Bass Boost Circuit
ON/OFF for the dynamic digital bass boost is controlled in the parallel mode (
pin (pin 20) and the DBB2 pin (pin 2
1
).
This is set in the serial mode (
S
P/
= “L”) with a microcontroller or other equipment. (refer to
1
0.2
microcontroller setting mode for further details on serial mode settings.)
A block diagram for the dynamic bass boost circuit is shown in Figure 6.
S
P/
= “H”) with the DBB
1
The compressor’s compression ratio when in the control mode for the parallel mode is shown below.
Table 3 Compressor Compression Ratio (when in the parallel mode)
DBB max
18dB
DBB MID
12dB
The compressor’s compression characteristics are as follows:
Table 4 Compressor Compression Characteristics (when in the parallel mode)
DBB max
36dB
DBB MID
24dB
Figure 6 Dynamic Digital Bass Boost Circuit Block
+
INPUT
OUTPUT
SERIAL
ATTENUATOR
COMPRESSOR BLOCK
L.P.F
Coefficient length: 7 bits
Figure 4 IIR Digital De-Emphasis Filter
Figure 5 Filter Characteristics
|G (j
ω
)|
1
/T
1
2
/T
1
T
1
= 50 μs, T
2
= 15 μs
+
+
Input data
b
0
a
1
b
1
Z
1
1
1
1
1
Z
0
a
(1
)
Z
b
(b
(Z)
H
:
function
Transfer
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