Codec
25Hz-P
50Hz-P
25Hz-I
Decoder SideCoder Side
25Hz-Progressive
50Hz-Progressive
25Hz-Interlaced
25Hz-Progressive
50Hz-Progressive
25Hz-Interlaced
GFC
GFC
GFC
GFC
OUTPUTS
INPUTS
l (t)
a
t
T
T T
21
Analog signal recovered
from the 2 down-sampled
sequences
n=-1
n=0
n=1 n=2
-1/T
1/T
2/T
f
fields
y
h
y
0
1 2 3
existing pixels in field 1
existing pixels in field 2
existing pixels in field 3
projection of field 1 onto field 3
projection of field 2 onto field 3
?
?
?
?
y
1 2 3
fields
4
0
y
h
existing pixels in even fields
existing pixels in odd fields
projection of field 2 onto field 3
pixels to be computed
analog signal hidden behind field 3
fs fs
fs
3
2
Input
Down-converted
Output
Down-sampled spectrumOriginal spectrum
x(j)
h(n)
y(i)
