SDA 9254-2

Semiconductor Group

3

1998-01-16

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:

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).

UEB10380

DD

V

4

4

8

3

CLASS

Y

UV

8

SDC4...11

SDC0...3

DLI0...3

SQA0...3

SQA4...11

DLO0...3

NR422

SDA 9254-2

SDA 9251-2X

SQA0...3

SDC0...3

4

4

4

8

8

Y

UV

Hz

()

K

11

K

–

〈〉

–

z

1

–

×

-------------------------------------------

=

ze

j

ωT

FLD

fielddelay

=

=