參數(shù)資料
型號(hào)： KD16902
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： Virtual Surround Processor(虛擬環(huán)繞處理器)
中文描述： 虛擬環(huán)繞聲處理器（虛擬環(huán)繞處理器）
文件頁(yè)數(shù)： 22/74頁(yè)
文件大小： 327K
代理商： KD16902
KD16902 VIRTUAL SURROUND PROCESSOR
FUNCTIONAL DESCRIPTION
22
Figure 19. Bass Redirection Function
The KD16902 is based on the DSP core with 16 bit fixed point precision. Therefore, the gains are used for scaling
down the signals before the summations to avoid overflow. The gains, g14 to g16, are either used for balancing the
output levels of the five main channels or scaling before the addition with LFE signal. Since the overall output of
Dolby Digital decoder is attenuated, the system should increase the output level of bass redirection appropriately to
the user desired level.
Example:
Suppose, the user wants to add the front signals and the output of the LPF. The user chose to atten-
uate both signals equally be 6 dB using g1 and g7 respectively to avoid possible overflow.
Then, the rear and the center signals must be attenuated by 6 dB before output using g15 and g16
to preserve the output level balance. Also, the system should increase the output level of the
KD16902 by 6 dB.
The parameter values of the switches for the basic output configurations are listed in Table 13 through Table 18.
Samsung recommends gain values for the basic configurations. The recommended values for the gains are listed
in Table 19 through Table 24. The values listed in the tables are for Dolby Digital mode. For Dolby Pro Logic mode,
the values should be set appropriately. The default configuration is Configuration 1. Therefore, the values listed in
Table 13 and Table 19 are the default parameters. The default sampling frequency is 48 kHz.
g11
g4
g11
g12
g12
g13
g4
g5
LPF
LFE Summation
g10
3
4
g15
2
g1
g14
1
g1
g14
1
g15
2
g16
g17
L
R
Ls
Rs
C
LFE
L
'
R
'
Ls
'
Rs
'
C
'
s1 s2 s2 s3 s3
s4
g2
g2
g3
g7
g7
g8
g8
g9
g6
g5
LPF
LFE
'
f4
f5
HPF
f3
HPF
f1
HPF
f1
HPF
f2
HPF
f2
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