hmp8112acn Harris Corporation, hmp8112acn Datasheet - Page 16

• Manufacturer Part Number: hmp8112acn
• Description: Ntsc/pal Video Decoder
• Manufacturer: Harris Corporation

NUMBER
NUMBER
NUMBER
7 - 0
7 - 0
7 - 6
5 - 4
3 - 2
1 - 0
BIT
BIT
BIT
Luminance Contrast
Adjust Factor
Hue Phase Adjust
High Frequency
Enhancement Factor
Middle Frequency
Enhancement
Factor
Low Frequency
Enhancement
Factor
Vertical High
Frequency
Enhancement
Factor
FUNCTION
FUNCTION
FUNCTION
This register sets the contrast adjust factor which is applied after the brightness. This val-
ue is multiplied by the luminance data and allows the data to be scaled from 0 to a factor
of +1.996. This 8-bit number is a fractional number as shown below:
The default contrast factor of 1.4766 is calculated as follows:
This register sets the hue phase offset adjustment. This 8-bit number is applied as a
phase offset to the CbCr data coming out of the demodulator. This 8-bit number is a in
the range of +127 to -128. The hue adjust has as range of 30
register allowing a 0.25
where bit 7 is the sign bit.
These bits adjust the amplitude of high frequency components in the luminance video
signal. The attenuation or multiplication of the high frequency components is adjusted as
shown below:
00 = Multiply high frequency components by 1.0
01 = Multiply high frequency components by 2.0
10 = Multiply high frequency components by 4.0
11 = Zero out high frequency components.
These bits adjust the amplitude of middle frequency components in the luminance video
signal. The attenuation or multiplication of the middle frequency components is adjusted
as shown below:
00 = Multiply middle frequency components by 1.0
01 = Multiply middle frequency components by 2.0
10 = Multiply middle frequency components by 4.0
11 = Zero out middle frequency components.
These bits adjust the amplitude of low frequency components in the luminance video sig-
nal. The attenuation or multiplication of the low frequency components is adjusted as
shown below:
00 = Multiply low frequency components by 1.0
01 = Multiply low frequency components by 2.0
10 = Multiply low frequency components by 4.0
11 = Zero out low frequency components.
These bits adjust the amplitude of vertical high frequency components in the luminance
video signal. The attenuation or multiplication of the vertical high frequency components
is adjusted as shown below:
00 = Multiply vertical high frequency components by 1.0
01 = Reserved.
10 = Reserved.
11 = Zero out vertical high frequency components.
TABLE 10. LUMINANCE SHARPNESS CONTROL REGISTER
TABLE 8. LUMINANCE CONTRAST ADJUST REGISTER
2
Register Data = Factor * 128 = 1.4766 * 128 = 189 = 0xBD
0
2
-1
2
TABLE 9. HUE ADJUST REGISTER
-2
2
-3
SUB ADDRESS = 0x02
SUB ADDRESS = 0x03
SUB ADDRESS = 0x04
2
-4
o
HMP8112A
phase adjustment. This register is in two’s complement format,
2
-5
2
-6
4-16
2
-7
DESCRIPTION
DESCRIPTION
DESCRIPTION
o
with each count in this
1011 1101
0000 0000
RESET
RESET
RESET
STATE
STATE
STATE
(0xBD)
(0x00)
00
00
00
00
B
B
B
B
B
B