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Signal processing device

A signal processing device and video signal technology, applied in image communication, TV, color TV components, etc., can solve the problems of composite video signal, such as loss of brightness and chroma-related information, lack of details in video images, etc.

Inactive Publication Date: 2013-07-24
RAFAEL MICROELECTRONICS
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a processing method will cause the loss of information related to brightness and saturation in the composite video signal
Although the known white level clipping circuit can achieve the effect of limiting the maximum amplitude of the composite video signal, but at the same time it will cause the final displayed video picture to lack some details

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Embodiment Construction

[0024] Please refer to figure 2 , figure 2 Waveform diagram for a typical composite video signal. As shown in the figure, in the composite video signal, the signal components at 0.3 volts to 1 volts are roughly the actual video information (generally including chroma and brightness information), while the signal components at -0.3 to 0 volts correspond to Synchronization information. Generally speaking, since the video information is usually related to the actual video content, the level of this part will not have a fixed tendency, that is, the level will roughly fluctuate randomly. On the other hand, since the level corresponding to the synchronous information is the size specified by the composite video signal standard, its amplitude is generally relatively fixed (generally 300 mV). Therefore, if the amplitude of the synchronous component is used to determine whether the maximum amplitude of the composite video signal exceeds the standard of 0.7 volts, a more accurate d...

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Abstract

The invention discloses a signal processing device which comprises a detection circuit and a processing circuit, wherein the detection circuit is used for detecting strength of a certain component of a video signal to produce a detection result. The processing circuit is connected with the detection circuit in a coupling mode and is used for processing the video signal according to the detection result. The signal processing device can be used as a white level clipping circuit to suitably attenuate the video signal.

Description

technical field [0001] The present invention relates to the processing of analog color TV video signals, in particular to a signal processing device which can be used to attenuate video signals under specific circumstances. Background technique [0002] In video transmission, composite video signal (Composite Video signal) is a widely used signal standard, and almost most video recording devices, display devices and display screens are equipped with ports corresponding to composite video signals. The composite video signal includes video information required for displaying video images and synchronization information between images, wherein the video information is composed of brightness and chroma information. In analog TV applications, the composite video signal is often modulated with the radio frequency carrier to the frequency band supported by the user's tuner (tuner), and then the receiver is used to process the composite video signal, or the video signal is further b...

Claims

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Application Information

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IPC IPC(8): H04N5/14
Inventor 汤皓云陈冠名
Owner RAFAEL MICROELECTRONICS
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