STV3550B STMicroelectronics, STV3550B Datasheet - Page 36

• Manufacturer Part Number: STV3550B
• Manufacturer: STMicroelectronics

Specifications of STV3550B

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

Video function description
3.3.7
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Figure 24. Black and white shrink diagram
Spectral processing
Adaptive peaking
The luminance bandwidth must be improved when processing decoded composite signals
and especially when a notch filter from the external digital video decoder is used.
Luminance is improved in the STV3550 by adaptive peaking which increases the signal
amplitude of a high-frequency spectrum.
This improves the outline of objects in a picture and increases the sharpness of the image.
Peaking effect is auto-adaptive and depends on image brightness.
In addition to the typical horizontal peaking, a vertical peaking mode can be selected in
which vertical luminance components are used in the peaking algorithm. In this mode,
vertical edges are also amplified. In this case, the vertical sharpness is much more sensitive
to input noise and should be disabled.
Coring
If certain noisy sources are input (RF broadcast or VCR, for example), noise may be present
in the signal. To prevent peaking due to noise amplification, certain coring thresholds must
be used to suppress any increase of small-amplitude high-frequency signals (noise). The
coring effect is programmable from 0 to 16 LSB.
As an example, the strength of the peaking is adjustable up to 64 steps from 0 to +10 dB.
The frequency peaking is adjustable from 1.5 MHz to 3.5 MHz by software (1H domain
frequencies).
Coring is set using the coring level parameter which gives the strength of the noise
suppression in 32 steps.
STV3550