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)： 15/74頁(yè)
文件大?。?/td> 327K
代理商： KD16902
FUNCTIONAL DESCRIPTION
KD16902 VIRTUAL SURROUND PROCESSOR
15
Figure 13. Virtual Surround Function
There are three main parts, licensed from QSound Labs, Inc., within the Virtual Surround function. First one is
QXpander (QX ) which is used for the front channels. QXpander expands the separation between left and right
channels, thus enhancing the front channels. Second part is the Q1 which is applied to the surround channels.
The Q1 provides discrete virtualization of the surround channels such that they are properly positioned with respect
to the front channels regardless of output configuration. The Q1 automatically compensates for "omni" (mono)
surround content as is typical of Dolby Pro Logic content that may be repackaged in a Dolby Digital System. The
last part is the Q123 for the center channel. It converts a mono signal into stereo signal. Depending on input and
output combination, a phantom operation instead of Q123 can be applied to center signal. The phantom operation
simply redirects the center signal into front speakers. The output of these three parts are combined appropriately to
yield the surround audio with 5 or less number of speakers. If the consumer has a subwoofer speaker, the LFE
channel is simply bypassed by setting the LFE on/off parameter.
QXpander, Q1, and Q123 are protected by U.S. patent nos. 5,105,462, 5,208,860 and 5,440,638 and various
foreign counterparts, and are copyright QSound Labs, Inc., 1993 - 1997. QXpander, QX, Q1, and Q123 are
trademarks of QSound Labs, Inc.
The advantage of the KD16902 is that the input and output are not constrained to 5.1 channel and 2 channels,
respectively. The KD16902 can accept any input mode, and the output can be any speaker combination. The
exception is 1+1 mode. The 1+1 mode is not supported in the KD16902. Table 8 summarizes the combination of
input and output modes supported by the KD16902. The input mode used here is the term for the audio coding
mode of the Dolby Digital bit stream. The output mode specifies the speaker combination. The terms, i.e., 3/2 for
the output mode is same as those used for the input mode.
Front Process
- QXpander (QX)
- Bypass
Surround Process
- Q1
- Bypass
Center Process
- Bypass
- Q123
Lout
Rout
LSout
RSout
CSout
Combination
for
Output modes
R
Ls
L
Rs
LFE
C
LFEout
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