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CXD2724AQ-1 Datasheet(PDF) 35 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) 35 Page - Sony Corporation

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CXD2724AQ-1
(6) Passive Decoder (Surround Channel)
The surround channel is processed according to the flow shown in Fig. 8-1-3.
The setting method for each section is described below.
SP
–KS (f8H)
SO
7kHz
LPF
M-BNR
Delay
Fig. 8-1-3. Passive Decoder Signal Flow (S-ch)
0020H
0040H
·
·
52b0H
·
6e40H
·
89d0H
·
a560H
·
·
bf80H
bfa0H
Setting value Dly (fbH)
ON
OFF
df66
0000
b2
5723
0000
b1
125e
0000
a
eda2
8000
–a
0.022ms
0.045ms
·
·
15.000ms
·
20.000ms
·
25.000ms
·
30.000ms
·
·
34.739ms
34.762ms
Delay (fs = 44.1kHz)
Table 8-1-9. Surround Channel (S-ch) Delay Time Setting
Value Examples
(6)-1. Delay Time Setting
[Relevant data] Coefficient: Dly (fbH)
The surround channel delay time can be varied
by setting the coefficient Dly value. (Dly is the
delay line read address.)
Only the upper 11 of the 16 coefficient bits are
used. The lower 5 bits are not used, and are
ignored even if set.
That is to say, Dly can be set in 0020H
increments, and the delay time can be set in
approximately 0.022 ms increments.
The following condition also applies.
• 0020H
≤ Dly ≤ bfa0H
The coefficient value is calculated as follows.
(Dly) Decimal = (Delay [s]
× fs [Hz] × 32
Example) For 20ms (fs = 44100 [Hz])
0.02
× 44100 × 32 = 28224
6e40H
(6)-2. 7kHz Low-Pass Filter
[Relevant data] Coefficients: b2 (afH), b1 (b0H), a (b1H), –a (b2H)
The 7kHz LPF of the passive decoder can be turned on and off by setting the coefficients in Table 8-1-10.
Table 8-1-10. Passive Decoder 7kHz LPF ON/OFF Setting
Hexadecimal conversion


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