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CXD2724AQ-1 Datasheet(PDF) 56 Page - Sony Corporation

Part No. CXD2724AQ-1
Description  Single-Chip Dolby Pro Logic Surround Decoder
Download  65 Pages
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Manufacturer  SONY [Sony Corporation]
Direct Link  http://www.sony.co.jp
Logo SONY - Sony Corporation

CXD2724AQ-1 Datasheet(HTML) 56 Page - Sony Corporation

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CXD2724AQ-1
(5) Hi-Dump Filter Setting
[Relevant data] Coefficient: ahd (0fH)
This filter is used to attenuate the high frequencies. It is mainly used in the delay line feedback loop to prevent
or alleviate noise generated when high frequency components are multiplied. Table 8-5-8 shows the
parameter table.
To turn off this filter, set "ahd = 8000H".
40
60
80
100
200
400
600
800
EF46
FEEA
FE8D
FE31
FC68
F8EA
F585
F23A
1/1
1/2
1/3
FE8D
FDD5
FD1E
FC68
F8EA
F23A
EBEE
E603
FDD5
FCC3
FBB3
FAA6
F585
EBEE
E32F
DB3B
fc [Hz]
–ahd
EF08
E073
C97A
B91E
AD94
A578
9FC6
9BCC
1/1
1/2
1/3
E073
C97A
AD94
9FC6
9912
D404
B91E
9FC6
974D
–ahd
1k
2k
4k
6k
8k
10k
12k
14k
fc [Hz]
Table 8-5-8. Hi-Dump Filter Parameter Table
(6) Secondary LPF Settings
[Relevant data] Coefficients: a00 (10H), a01 (11H), a02 (12H), b01 (13H), b02 (14H), a10 (2bH),
a11 (2cH), a12 (2dH), b11 (2eH), b12 (2fH)
These two LPF are comprised from the same secondary IIR filters. The parameter tables are shown in Tables
8-5-9 to 8-5-11. These tables show the parameters for no decimation, 1/2 decimation and 1/3 decimation,
respectively.
Use Table 8-5-9 (No decimation) for LPF1.
The coefficients used for the LPF0 and LPF1 parameters are as follows.
LPF0: a00 (10H), a01 (11H), a02 (12H), b01 (13H), b02 (14H)
LPF1: a10 (2bH), a11 (2cH), a12 (2dH), b11 (2eH), b12 (2fH)
To turn off the filters, set only a00 and a10 to "8000H" and the other four coefficient values to "0000H".


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