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CXD2724AQ-1 Datasheet(PDF) 62 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) 62 Page - Sony Corporation

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CXD2724AQ-1
Appendix 1. Soft Mute
The condition where the final volume coefficient data connected to the CXD2724Q output of each mode is off
(= 0000H) is called "soft mute".
(Soft mute cannot be applied in bypass mode.)
Table 9 shows the coefficients that should be set to 0000H in each mode during soft mute. Table 9 also
includes the loop input volume coefficients and feedback volume coefficients for modes which contain a
feedback loop.
KLV (00), KRV (01), KCV (02), KSV (03), KLd (0e), KRd (0f), KCd (10), KSd (11),
Kfb (12), KDV1 (21), KDV2 (22), KDV3 (23), KLRm1 (24), KLRm2 (25), KLRm3 (26),
KL (f2), KR (f3), KH (f4), KP (f5), KCH (f6), KCP (f7), KS (f8)
attV (f1), KL (f2), KR (f3), KCP (f7), KS (f8)
Same as Pro Logic mode
Same as Pro Logic or Virtual mode
KLsri (0c), KRsri (0d), Kfb (0e), KLod (32), KRod (33), KSod (34), KCod (37)
Pro Logic mode
Virtual mode
Dolby 3 Stereo mode
Noise sequencer mode
SFC mode
Mode name
Coefficient name (Address [H])
Table 9. Recommended Mute Coefficients
RAM Initialization
Although this LSI contains a number of RAM, there is no clear function and the like. Therefore, it is impossible
to predict the type of data existing in the RAM after power-on. Also, the previous mode's data remains even
after the mode is changed, possibly causing momentary noise. If these problems cannot be handled by the
system mute, apply soft mute for a time equal to the maximum delay time of the delay RAM (varies according
to the mode and coefficient settings) during power-on and when changing the mode. This clears all the RAM.
Example 1)
When using 20.0ms for the passive decoder and 14.8ms for the simple SFC delay line
The maximum delay time is 20.0ms, so soft mute must be applied continuously for 20.0ms.
Example 2)
When using the delay RAM in SFC mode with 1/2 decimation
Comb filter delay time = 36.0ms
All pass filter delay time = 16.8ms
The maximum delay time is 36.0ms, so soft mute must be applied for 36.0ms.


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