CXD2724AQ-3 datasheet(44/65 Pages) SONY

Part #	CXD2724AQ-3

Description	Single-Chip Dolby Pro Logic Surround Decoder

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CXD2724AQ-3

(3) Volume Coefficient Settings

[Relevant data] Coefficients: attV (f1H), KL (f2H), KR (f3H), KCP (f7H), KS (f8H)

Adjust the levels of the two Virtual mode channels by the amount of the four Pro Logic decoder output

channels using KL (f2H), KR (f3H), KCP (f7H) and KS (f8H). (See Table 8-1-7.)

The mixing level of the surround channel can be adjusted

with coefficient attV (f1H).

attV can be set in the range of 7fffH to 0000H as shown in

Table 8-2-3.

The I/O levels for 7fffH to 0001H are obtained by the

following formulas.

(Coefficient value) = [D15 +

∑ (Dn × 2n – 15)] × 2

I/O level = 20 log [coefficient value] dB

Also, the most effective listening area is shown in Fig. 8-2-3.

7fffH

5a67H

3fffH

2d4eH

2000H

1000H

0001H

0000H

Coefficient value

+6.02

+3.00

0.00

–3.00

–6.02

–12.04

–84.29

–

∞

Level [dB]

14

n = 0

∗ Sony recommended value: 5333H (+2.28dB)

Table 8-2-3. attV (f1H) Setting Value Examples

–KCP (f7H)

–KS (f8H)

Lt

L

R

C

S

Rt

Pro

Logic

Decoder

Virtual

Surround

Process

Mixing

–KL (f2H)

–KR (f3H)

attV (f1H)

L

R

C

VL

VR

L

R

Lt

Rt

Lout

Rout

S

L

C

R

Lch

Rch

1.2 to 2.0m

Phantom

center

44°

Virtual

surround

Virtual

surround

Listening center

Fig. 8-2-2. Volume Setting Coefficients

Fig. 8-2-3. Listening Area

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CXD2724AQ-3 Datasheet(PDF) 44 Page - Sony Corporation

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