SDA9254-2 Datasheet, PDF (3/32 Pages) Siemens Semiconductor Group – 2.6 MBit Dynamic Sequential Access Memory for Television Applications (TV-SAM) with On-chip Noise Reduction Filter

SDA 9254-2
CLASS
Y
UV
3
8
SDC4...11
4
8
SDC0...3
4
DLI0...3
V _DD
NR422
SDA 9254-2
SQA4...11
4
SQA0...3
4
DLO0...3
8
Y
8
UV
SDC0...3
SDA 9251-2X
4
SQA0...3
UEB10380
Figure 2
Noise Reduction with 4:2:2 Signals
Adaptive Field Based Noise Reduction
The reduction of noise is performed by recursive filtering. The filter has the following transfer
function:
H(z) = _1-----–-----_〈---1-----_–--K---K----_〉----_×----z----_–--₁--
z = e^jωTFLD,
T_FLD = fielddelay
For K = 1 the transfer function is H(z) = 1, that means no filtering is performed and the input data
remains unchanged. For K < 1 noise reduction filtering is activated. The input data and the delayed
data from the memory are combined according H(z).
Semiconductor Group
3
1998-01-16