Device and method for automatically discriminating between formats of video signals
AssigneeSamsung Electronics Co., Ltd.
InventorHak-jae Kim
Life of this patent
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Abstract
A device and a method for automatically discriminating formats of video signals input to a monitor and processing the respective signals in accordance with the identified formats are provided. The device automatically identifies whether signals input to the same input port are RGB type PC signals or YPbPr type HDTV signals and processes the signals in accordance with the identified formats. Therefore, users have only to install a single input port commonly used to receive PC signals and HDTV signals rather than installing separate input ports for separately receiving PC signals and HDTV signals.
Claims10
A device for automatically discriminating between formats of video signals for use in a video signal processor, the automatic video signal format discrimination device comprising:
- a level detector for detecting the level of a video signal input to an input port of the video signal processor;
- a comparator for comparing the video signal detected by the level detector with a predetermined reference voltage;
- and
- a controller for considering the video signal as a YPbPr type signal if the detected level is determined as being lower than the reference voltage at least predetermined number of times within a specific section, and if not, considering the video signal as an RGB type signal.
A device for automatically discriminating between formats of video signals for use in a video signal processor, the automatic video signal format discrimination device comprising:
- a clamp unit for generating a clamp signal that has a level corresponding to a clamp control signal from an analog video signal input to an input port;
- an A/D converter for converting the analog video signal input to the input port into a digital signal based on the clamp signal;
- a format converter for converting a YPbPr type signal output from the A/D converter into an RGB type signal;
- a switching unit for receiving a signal output from the format converter and a signal output from the A/D converter and outputting one of the signals selectively depending on a switching control signal;
- a scaler for compressing or decompressing the RGB type signal from the switching unit to make the RGB type signal suitable for a monitor resolution;
- and
- a controller for determining if any data exists within a lower bit area of a signal output from the scaler, wherein if no data exists within the lower bit area of the signal output from the scaler, the controller determines that the signal from the scaler is the YPbPr type signal, outputs a clamp control signal necessary to generate a middle level clamp signal to the clamp unit, enables the format converter, and outputs the switching control signal in order to make the switching unit output the signal input thereto from the format converter, and if there are data within the lower bit area of the signal output from the scaler, the controller determines that the signal output from the scaler is the RGB type signal.
A method for automatically discriminating between formats of video signals for use in a video processing method, the automatic video format discrimination method comprising the steps of:
- (a) generating a bottom level clamp signal from an analog video signal;
- (b) converting the analog video signal into a digital signal based on the bottom level clamp signal;
- (c) inputting the digital signal converted in the step (b) and compressing or decompressing the digital signal to produce data that has a resolution suitable for predetermined display formats, wherein data that has a resolution suitable for predetermined display formats is RGB data;
- and
- (d) determining the digital signal to be a YPbPr type signal if there is no data in a lower bit area of the produced data in the step (c);
- (e) determining the digital signal to be an RGB type signal if there is data in the lower bit area of the produced data in the step (c);
- and
- (f) processing the analog video signal according to a bottom level clamp mode in response to step (e) and according to a middle level clamp mode in response to step (d).
Dependencies are inferred from the claim text.