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CXD2724AQ-3 Datasheet(PDF) 62 Page - Sony Corporation |
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CXD2724AQ-3 Datasheet(HTML) 62 Page - Sony Corporation |
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62 / 65 page  – 62 – CXD2724AQ-3 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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