ADV7301A datasheet(46/68 Pages) AD

46 / 68 page

REV. A

–46–

ADV7300A/ADV7301A

HD Sharpness Filter and Adaptive Filter Application Examples

HD Sharpness Filter Application

The HD sharpness filter can be used to enhance or attenuate

the Y video output signal.

The register settings in Tables XIX and XX are used to achieve

the results shown in Figure 64. Input data was generated by an

external signal source.

Table XIX. Sharpness Filter on Frequency Sweep

Address

Reference

00h

FCh

01h

10h

02h

20h

10h

00h

11h

81h

20h

00h

20h

08h

20h

04h

20h

40h

20h

80h

20h

22h

*See Figure 64.

The effect of the sharpness filter can also be seen when using the

internally generated crosshatch pattern.

Table XX. Sharpness Filter on Internal Test Pattern

Address

00h

FCh

01h

10h

02h

20h

10h

00h

11h

85h

20h

99h

In toggling the Sharpness Filter Enable Bit [Address 11h,

Bit 8], it can be seen that the line contours of the crosshatch

pattern change their sharpness.

Figure 64. HD Sharpness Filter Control with Different Gain Settings for HD Sharpness Filter Gain Value

Adaptive Filter Control Application

Figure 65 shows a typical signal to be processed by the adaptive

filter control block.

: 692mV

@: 446mV

: 332ns

@: 12.8ms

Figure 65. Input Signal to Adaptive Filter Control

: 690mV

@: 446mV

: 332ns

@: 12.8ms

Figure 66. Output Signal After Adaptive Filter Control

The register settings in Table XXI are used to obtain the results

shown in Figure 66, i.e., to remove the ringing on the Y signal.

Input data was generated by an external signal source.

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