CXD2724AQ-1 Datasheet, PDF (45/65 Pages) Sony Corporation – Single-Chip Dolby Pro Logic Surround Decoder

CXD2724AQ-1
8-3. Dolby 3 Stereo Mode
This mode is a part of the Pro Logic adaptive matrix functions.
Specifically, surround output is muted and surround signal directionality is not harmonized.
(1) Setting Dolby 3 Stereo Mode
Dolby 3 Stereo mode must be set by the following procedures in order to achieve stable adaptive matrix
operation. Setting Dolby 3 Stereo 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 Dolby 3 Stereo mode coefficient data.
iii) Transfer the setup data set in Dolby 3 Stereo mode.
• Changing to Dolby 3 Stereo mode from Virtual mode
Note) The coefficients for the Dolby 3 Stereo mode or Pro Logic mode soft mute status must be set in
coefficient RAM addresses 00H to 7fH when shifting to Virtual mode.
i) Apply the soft mute in Virtual mode.
ii) Transfer the setup data set in Dolby 3 Stereo mode.
iii) Cancel the Dolby 3 Stereo mode soft mute.
• Changing to Dolby 3 Stereo 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 Dolby 3 Stereo mode coefficients for the soft mute status.
v) Transfer the setup data set in Dolby 3 Stereo mode.
vi) Cancel the Dolby 3 Stereo mode soft mute.
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