參數(shù)資料
型號: KS0125
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: Multi-standard Video Encoder(多標(biāo)準(zhǔn)視頻編碼器)
中文描述: 多標(biāo)準(zhǔn)視頻編碼器(多標(biāo)準(zhǔn)視頻編碼器)
文件頁數(shù): 14/36頁
文件大?。?/td> 561K
代理商: KS0125
KS0125
MULTIMEDIA VIDEO
PAGE 14 OF 36
The crisping circuit further improves video quality. The crisping circuit is designed to reduce mosquito effect in
MPEG 1 video. The functional block diagram is shown in Figure 8. It consists of a band separation circuit, a coring
circuit, and a gamma correction ROM. The Y data is first separated into high and low frequency components. The
high frequency component
s low amplitude signals can optionally be suppressed by the coring circuit. The
amplitude can be binary codes 1, 3, or 6, which is selected by programming the
COR[1:0]
bits in
REGA
. An
additional gamma ROM can apply gamma correction to the high frequency component after the coring function.
Two selections are provided for gamma correction. One has large peaking (
GAMMA
in
REGA
is set to a 1); the
other has small peaking (
GAMMA
is set to a 0). The gamma correction can be disabled by programming the
GAMEN
bit in
REGA
to a 0. Finally, the high and low frequency components are recombined
.
Figure 8. Crisping Circuit Block Diagram
The luminance data is gain and offset adjusted so its output will be at the correct NTSC or PAL level. The sync and
OSD are inserted after the gain and offset conversion stage.
Before going to the DAC, the luminance data is interpolated to 27 MHz. This up sampling will simplify the external
analog reconstruction filter. Figure 9 shows the characteristic of the interpolation filter. An optional one pipe line
delay is also included to compensate for any YC delay in the reconstruction filter
Yin
Yout
HPF
Coring
Gamma
LPF
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