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Acquisition device for synchronization signal

A technology of synchronous signals and analog signals, applied in image communication, television, multiple input and output pulse circuits, etc., can solve problems such as thermal drift

Active Publication Date: 2010-10-27
REALTEK SEMICON CORP
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] In view of the above problems, the main purpose of the present invention is to provide a synchronous signal extractor to solve the phenomenon of thermal drift caused by process or temperature changes in the display system

Method used

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  • Acquisition device for synchronization signal
  • Acquisition device for synchronization signal

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Embodiment Construction

[0036] image 3It is a schematic diagram of the structure of the synchronous signal extractor of the present invention. The synchronous signal extractor 300 of the present invention receives an image analog signal (SOG or SOY signal) containing a synchronous signal, and generates a mixed synchronous signal HS+VS. The synchronous signal extractor 300 includes a transistor 310 , a resistor 120 , a clamper 320 , an analog multiplexer 330 and a comparator 130 . One end of the transistor 310 is connected to a fixed voltage VB1, and the other end is defined as an input node A for receiving the analog image signal including the synchronization signal. One end of the resistor 120 is connected to node A, and the other end is grounded. The clamper 320 is used to reconstruct the DC voltage level of the image analog signal, and its output terminal is defined as node B. The analog multiplexer 330 receives the voltages of the nodes A and B, and selects the voltage output of one of the tw...

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Abstract

The invention provides a sync signal extractor which comprises a transistor, a resistance, a clamper, a simulation multiplexer and a comparator. Under a mixed horizontal sync signal mode, when a machine is just started, a circuit does not have a sync signal HS; therefore, the sync signal extractor uses a known circuit to capture the mixed sync signal at first, so as to be convenient for other circuits to generate a sync signal and a clamping signal. Then, a mode selection signal is used to convert the simulation multiplexer to a forced clamping mode; at the moment, as the output voltage of the clamper is set by a user and is not set by the technique, a DC voltage value is easier to control and is difficult to shift with the change of the technique and the temperature.

Description

technical field [0001] The present invention relates to a display (display) system, and in particular to a synchronous signal extractor to solve the problems of synchronous green (synchronization on green, SOG) and synchronous synchronous on luma (synchronization on luma, SOY) circuits. voltage) The phenomenon of drift (drift) caused by process or temperature changes. Background technique [0002] The analog front-end device of the traditional display system includes a sync-on-green circuit, which is used to extract a mixed sync signal according to a sync-on-green signal, and the mixed sync signal includes a horizontal synchronization signal (horizontal synchronization) HS and vertical synchronization (vertical synchronization) ) vs. [0003] figure 1 It is a structural diagram of a traditional synchronous circuit in green. FIG. 2A is a schematic diagram of a SOG signal. Figure 2B It is a schematic diagram of the SOG signal, the mixed synchronous signal HS+VS and the cl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/04H03K5/24
Inventor 蔡瑞原陈思平周裕彬
Owner REALTEK SEMICON CORP
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