CXD2724AQ-3 datasheet(41/65 Pages) SONY

Part #	CXD2724AQ-3

Description	Single-Chip Dolby Pro Logic Surround Decoder

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Manufacturer	SONY [Sony Corporation]

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CXD2724AQ-3

8-2. Virtual Dolby Surround Mode (Virtual Mode)

Virtual mode is comprised of the Dolby Pro Logic Surround decoder and the Virtualizer as shown in Fig. 8-2-1.

Virtual Dolby Surround is realized by the Virtualizer block.

(1) Setting Virtual Mode

Virtual mode must be set by the following procedures in order to achieve stable adaptive matrix operation.

Setting Virtual mode by procedures other than those given below may aggravate the decoder characteristics.

• Immediately after power-on reset

i)

Transfer the following setup data.

SQA = 0030H (Field A)

SQD = 7ee7H (Field D)

∗ Field C is "All 0", so the DAC forced mute is applied.

ii) Transfer the Virtual mode coefficient data.

iii) Transfer the setup data set in Virtual mode.

• Changing to Virtual mode from a different mode

i)

Apply the soft mute in the current mode.

ii) Set the coefficients at the following addresses to "0000H".

Addresses: 6eH to 7fH

iii) Transfer the following setup data.

SQA = 0030H (Field A)

SQD = 7ee7H (Field D)

∗ The DAC forced mute is not applied by Field C.

iv) Transfer the Virtual mode coefficients for the soft mute status.

v) Transfer the setup data set in Virtual mode.

vi) Cancel the Virtual mode soft mute.

(2) Setting Data

(2)-1. Setup Data

Table 8-2-1 lists the registers most closely related to Virtual mode.

Setup data not listed in Table 8-2-1 may be set as desired, with due consideration given to the contents of

Fields A to D noted in "6. Setup Register".

1: Noise sequencer mode

1: Virtual mode

01: Dolby 3 Stereo mode

01: SFC mode

Coefficient RAM area setting (111: Other than Virtual mode, 100: Virtual mode)

SQA14

SQA13

SQA09, 08

SQA05, 04

SQD02 to 00

"0"

"1"

"00"

"100"

Register name Setting value

Remarks

Table 8-2-1. Virtual Mode Setup Register Settings

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