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STV3550

Video Functional Description

algorithm that includes a comet-effect canceller. The strength of the noise reduction can be

adjusted in 32 steps depending on the noise level.

The SDIN includes a Noise Estimator that delivers a 32-step data item on the noise level for each

field. This data can be processed by the CPU to control the 3D-Temporal Noise Reductor and then

performs an adaptive noise reduction. This function is available in standard configurations only.

3.1.1.6 Motion Estimator

When the D1 interface is set in a standard configuration (720 pixels per line and 288 or 240 lines per

field), the SDIN provides scene change and video picture format data based on 3 consecutive

fields.

This information can be processed by the CPU to determine if the signal is from a video or a film

source, and then the CPU can select the optimized up-conversion mode (Proscan field merging or

interpolation).

This data is also used to determine the polarity of the field: Top First (generally used) or Bottom

First.

3.2

Video Timebase Generator (VTG)

This block generates the up-converted horizontal and vertical sync pulses required to drive the

video output stages. It receives the extracted H/V sync pulses from the SDIN block, in the 1H

domain, and, depending on the selected synchronization mode, provides H/V sync pulses for the

2H domain.

The VTG is able to generate all output synchronization pulses from 1H to 3H for horizontal sweep

and 50 Hz to 120 Hz for Vertical sweep, in Interlaced or Progressive mode.

The VTG clock is derived from the on-board crystal oscillator to reduce jitter. Vertical and horizontal

sync pulses are generated by the division of the VTG_CLK signal frequency.

The CPU manages the division factors and processes the incoming 50-Hz H and V pulses to

generate the required 100-Hz scanning sequences.

3.2.1

Synchronization Modes

●

Slave by H and V signals (embedded or external)

●

Slave by V signals (embedded or external)

●

Master mode.

●

Pass-through (for VGA application) with generator-locking of the OSD clock.

3.2.2

Deinterlacing Modes and Progressive Scan Output

The de-interlacing can be done in the following modes:

●

Spatial line interpolation, using the high resolution vertical polyphase filter

●

Motion adaptive spatial-temporal interpolation, using the median filter

●

Field merging for film sources

Note:

The scrolling mode is done by programming the Video Timebase Generator (VTG) that defines the

output number of lines/field, and by programming the Video Display Pipeline that performs the

number of pixel/line interpolations.

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