CXD2728Q datasheet(32/61 Pages) SONY

Part #	CXD2728Q

Description	Single-Chip Dolby Pro Logic Surround Decoder

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CXD2728Q

(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

·

ff80H

ffa0H

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

·

46.349ms

46.372ms

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 ≤ ffa0H

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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