CN102523413B - Method and apparatus for input signal loss detection - Google Patents
Method and apparatus for input signal loss detection Download PDFInfo
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- CN102523413B CN102523413B CN201110416962.1A CN201110416962A CN102523413B CN 102523413 B CN102523413 B CN 102523413B CN 201110416962 A CN201110416962 A CN 201110416962A CN 102523413 B CN102523413 B CN 102523413B
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Abstract
The invention discloses a method for input signal loss detection. The method comprises the following steps that: input channels that need to be detected are selected by a display interface as well as information of the input channels is output; a reception module receives the information of the input channels as well as connection between at least one input channel and a signal detector in a matrix is successively and circularly switched according to the information of the input channels; and the signal detector determines whether an input signal after the input channel switching is lost or not; if so, correlated information of a channel in a signal loss state is output. In addition, the invention also provides an apparatus for input signal loss detection. According to the invention, loss detection on multi-path input signals can be realized.
Description
Technical field
The invention belongs to safety-security area, particularly a kind of method of input signal loss detection and device.
Background technology
Along with scientific and technological development, the development of security protection industry is basic forming, and high-tech electronic product, full-digital network product emerge in multitude.In prior art, to the signal alarm in safety-protection system, adopt DVR (Digital Video Recorder, DVR) or NVR (Network Video Recorder, Network Personal Video Recorder) respectively the signal of simulation and network to be detected.Its defect is, DVR can only carry out loss detection to the signal that connects self.
Summary of the invention
Main purpose of the present invention is to provide a kind of method of input signal loss detection, is intended to improve input ability, realizes the detection of multichannel input signal.
In order to realize goal of the invention, the invention provides a kind of method of input signal loss detection, comprise the following steps:
By display interface, select to need the input channel of detection, and export the information of described input channel;
Control module receives the information of described input channel, and is connected with signal detector according at least one input channel in the information of described input channel successively cyclic switching matrix;
Whether the input signal that signal detector judgement is switched after input channel is lost;
If so, the relevant information of the passage of Out-Lost signal.
Preferably, described signal detector detects and switches after input channel, judges whether input signal is lost to comprise:
By detecting the synchronizing signal of AV signal, judge the validity of AV signal;
By detecting a row sequential of VGA signal, judge the validity of VGA signal;
By detecting the sequential of HDMI signal and the validity that HDMI signal data judges HDMI signal.
Preferably, the information of the described input channel of described reception specifically comprises:
Receive the information of described input channel;
The information of temporary described input channel.
Preferably, after the relevant information of passage of carrying out described Out-Lost signal, also comprise:
Control module receives and controls the relevant information that display interface shows the passage of described lossing signal.
Preferably, described matrix comprises AV matrix, VGA matrix and/or HDMI matrix.
The present invention also provides a kind of device of input signal loss detection, and for realizing said method, the device of described input signal loss detection comprises:
Display module, for selecting to need the input channel of detection, and exports the information of described input channel;
Control module, for receiving the information of described input channel, and being connected according at least one input channel in the information of described input channel successively cyclic switching matrix and signal detector;
Signal detector, for judging whether the input signal switching after input channel is lost; When input signal being detected and lose, the relevant information of the passage of Out-Lost signal.
Preferably, described signal detector comprises:
AV detecting unit, for judging the validity of AV signal by detecting the synchronizing signal of AV signal;
VGA detecting unit, for judging the validity of VGA signal by detecting a row sequential of VGA signal;
HDMI detecting unit, for by detecting the sequential of HDMI signal and the validity that HDMI signal data judges HDMI signal.
Preferably, described control module comprises:
Receiving element, for receiving the information of described input channel;
Memory cell, for the information of temporary described input channel.
Preferably, described control module also comprises:
Lossing signal processing unit, shows the relevant information of the passage of described lossing signal for receiving and control display module.
Preferably, described matrix comprises AV matrix, VGA matrix and/or HDMI matrix.
The present invention selects to need the input channel of detection by Operation display module, the information of the input channel that control module sends according to display module, and the input channel of cyclic switching matrix is connected with the test side of signal detector.Can realize whole input signals is carried out to cycle detection, and the channel information of display loss, reminding user, it is simple to operate, can reduce the workload that user checks.
Accompanying drawing explanation
Fig. 1 is the method one embodiment schematic flow sheet of input signal detection of the present invention;
Fig. 2 is the device one example structure schematic diagram of input signal detection of the present invention.
The realization of the object of the invention, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
With reference to Fig. 1, the method one embodiment schematic flow sheet that Fig. 1 is input signal detection of the present invention.The method of this input signal detection comprises the following steps:
Step S10, selects to need the input channel of detection by display interface, and exports the information of input channel; First can obtain the information of the input channel being connected with display interface by a selection module, and be presented at display interface for user's selection.When user chooses the input channel that needs detection, export the type of this input channel and channel number to a control module.This control module can be carried out hand-off process to input channel, concrete, and control module can be the part in a liquid crystal-spliced process software.The input channel information in the embodiment of the present invention of it should be noted that refers to type and the channel number of input channel.
Step S20, control module receives the information of input channel, and being connected according at least one input channel in the information of input channel successively cyclic switching matrix and signal detector; For example, can receive by control module type and the channel number of input channel, then according to the type of passage, with channel number, the detection port of signal detector is connected with corresponding input channel, successively cyclic switching wherein at least one passage be connected with signal detector.Concrete, if matrix Shang You 10 road input signals, control module is 1 to 10 passage by its reference numeral.If desired the input signal of 1 to 6 passage is detected, first by the detection port of 1 passage and signal detector, the link on matrix is communicated with control module gating matrix, carry out input, after 1 passage has detected, first disconnect 1 passage, be communicated with 2 passages, then the signal of 2 passages detected, successively 1 on matrix to 6 passages are carried out to cycle detection.It should be noted that in embodiments of the present invention, adopt a road detection port to detect, according to actual conditions, if when the way of input signal is more, for improving detection speed, can to output signal, detect by multichannel detection port simultaneously.
Step S30, whether the input signal that signal detector judgement is switched after input channel is lost;
Step S40, the if so, relevant information of the passage of Out-Lost signal.
Signal detector, after switching input channel, judges whether input signal is lost.In embodiments of the present invention, input signal comprises AV (Audio Video, Voice & Video) signal, VGA (VideoGraphics Array, Video Graphics Array) signal and/or HDMI (High Definition MultimediaInterface, HDMI (High Definition Multimedia Interface)) signal.Concrete, signal detector is by detecting the synchronizing signal of AV signal, to judge the validity of AV signal; By detecting a row sequential of VGA signal, judge the validity of VGA signal; By detecting the sequential of HDMI signal and the validity that HDMI signal data judges HDMI signal.During the dropout of any road input channel in one of them passage in above-mentioned 1 to 6 passage being detected, signal detector is sent to control module by the information of this passage, continues to be switched to next passage and carries out signal loss detection.Concrete, when AV signal is detected, can judge by detecting the synchronizing signal of AV signal the validity of its signal.When the wherein AV dropout of a certain passage being detected, this channel information is sent to control module.Control module judges the information of lossing signal by this channel information, and shows that by Operation display module relevant dropout information is with reminding user.
In the embodiment of the present invention, after above-mentioned steps S30, also can comprise: when signal detector does not detect dropout, continue to be switched to next passage and carry out signal loss detection.
The embodiment of the present invention needs the input channel detecting by selection, according to the information of input channel, the input channel of cyclic switching matrix is connected with signal detector, can realize whole input signals is carried out to cycle detection.
Above-mentioned matrix comprises AV matrix, VGA matrix and/or HDMI matrix.The output channel of this matrix test side corresponding with signal detector connects, and is respectively used to AV signal, VGA signal and HDMI input; Above-mentioned input channel can be input channel, the input channel in VGA matrix and/or the input channel in HDMI matrix in AV matrix.Concrete, if this input channel is 1 to 3 input channel of AV matrix and 4 to 6 input channels of VGA matrix, control module can be controlled it and first 1 of AV matrix to 3 input channels be detected, 4 to 6 input channels that are then switched to VGA matrix detect.It should be noted that in the present embodiment and can detect according to said sequence, the order that can also be other according to actual conditions detects.
Signal detector can be connected with AV matrix, VGA matrix and HDMI matrix, the input channel corresponding with matrix by control module cyclic switching matrix is connected with signal detector, respectively AV signal, VGA signal and HDMI signal are detected, below the detection of three kinds of signals is specifically described.
AV input is by detecting the synchronizing signal of AV signal, to judge the validity of signal by synchronization loss alarm, to realize the synchronous detection of composite video signal.It can input composite video signal, grey scale signal or other vision signal with synchronous head.Concrete, comprise input clamp circuit, can setover line by line and revise any DC shift; Low pass filter, can avoid wrong synchronous detection by reducing look burst, colourity and noise; Synchronizing indicator and LOS filter, can monitor the lock-out pulse that is greater than synchronization minimum voltage (0.13VP-P).If detector is not detecting lock-out pulse in the time of 3.4ms, LOS filter will drag down LOS.Lock-out pulse detected at least after 2.2ms, LOS filter makes LOS return to high-impedance state.
VGA input is to realize by detecting a row sequential for VGA signal, respectively the row sequential of VGA and frame (field) sequential is detected, and determines whether effective sequential.
HDMI signal is that the validity by the sequential of HDMI signal and HDMI signal data detects, HDMI signal adopts LVDS (Low-Voltage Differential Signaling, Low Voltage Differential Signal) mode is transmitted, and is a kind of new technique that meets current high-performance data transmission application.
Further, the input of the information of the reception input channel in step S20 specifically comprises, after the information of control module reception input channel, keeps in the information of input channel.Control module receives and keeps in the above-mentioned information that needs the input channel of detection, for the switching of gating matrix and the passage of matrix, switches.Concrete, control module gating matrix, according to channel number successively switching channel, when all passages of one of them matrix have switched, will be switched to another matrix, and extremely all passages of all matrixes have all switched, and complete once patrolling and examining all input signals.It should be noted that according to actual conditions and can also sequentially patrol and examine according to other.
After carrying out above-mentioned steps S40, also comprise:
Control module receives and controls the relevant information that display interface shows the passage of above-mentioned lossing signal.First by control module, received the relevant information of the passage of above-mentioned lossing signal, and analyze the relevant information of the passage of lossing signal; In the embodiment of the present invention, control module can receive by the mode of serial communication the relevant information of the passage of model lossing signal that detector sends, and analyzes the relevant information of the passage of lossing signal.The relevant information of the passage of this lossing signal comprises the type of matrix and the channel number of matrix, by control module, according to the relevant information of this passage, analyzes signal type and the corresponding input channel of lossing signal.Control module is exported corresponding signal type and input channel information to display interface, and display interface shows signal type and the corresponding input channel of lossing signal, with reminding user, the circuit of this passage is checked.
The embodiment of the present invention selects to need the input channel of detection by display interface, control module input channel breath, and cyclic switching Input matrix passage is connected with the test side of signal detector.Can realize whole input signals is carried out to cycle detection, and the channel information of display loss, reminding user, it is simple to operate, can reduce user's workload.
The present invention also provides a kind of device of input signal loss detection for realizing said method, as shown in Figure 2, and the device one example structure schematic diagram that Fig. 2 is input signal detection of the present invention.The device of this input signal detection comprises:
Display module 10, for selecting to need the input channel of detection, and exports the information of input channel; In the present embodiment, display module 10 can be above-mentioned display interface.First can obtain the information of the input channel being connected with display interface by a selection module, and be presented at display interface for user's selection.When user selects to need the good input channel that need to detect, export the type of this input channel and channel number to a control module 20.This control module can be carried out hand-off process to input channel, concrete, and control module 20 can be the part in a liquid crystal-spliced process software.The input channel information in the embodiment of the present invention of it should be noted that refers to type and the channel number of input channel.
Control module 20, for receiving the information of input channel, and being connected according at least one input channel in the information of input channel successively cyclic switching matrix and signal detector 30; For example, can receive the type of input channel and the input of channel number by control module 20, then according to the type of passage, with channel number, the detection port of signal detector 30 is connected with corresponding input channel, successively cyclic switching wherein at least one passage be connected with signal detector 30.Concrete, if matrix Shang You 10 road input signals, control module is 1 to 10 passage by its reference numeral.If desired the input signal of 1 to 6 passage is detected, first by the detection port of 1 passage and signal detector 30, the link on matrix is communicated with control module 20 gating matrixs, carry out input, after 1 passage has detected, first disconnect 1 passage, be communicated with 2 passages, then the signal of 2 passages detected, successively 1 on matrix to 6 passages are carried out to cycle detection.It should be noted that in embodiments of the present invention, adopt a road detection port to detect, according to actual conditions, if when the way of input signal is more, for improving detection speed, can to output signal, detect by multichannel detection port simultaneously.
In embodiments of the present invention, input signal comprises AV signal, VGA signal and/or HDMI signal.Concrete, signal detector 30 comprises AV detecting unit 301, VGA detecting unit 302 and HDMI detecting unit 303.Wherein AV detecting unit 301, for judge the validity of AV signal by detecting the synchronizing signal of AV signal; VGA detecting unit 302, for judging the validity of VGA signal by detecting a row sequential of VGA signal; HDMI detecting unit 303, for by detecting the sequential of HDMI signal and the validity that HDMI signal data judges HDMI signal.During the dropout of any road input channel in one of them passage in above-mentioned 1 to 6 passage being detected, signal detector 30 is sent to control module 20 by the information of this passage, continues to be switched to next passage and carries out signal loss detection.Concrete, when AV signal is detected, can judge by detecting the synchronizing signal of AV signal the validity of its signal.When the wherein AV dropout of a certain passage being detected, this channel information is sent to control module 20.Control module 20 judges the information of lossing signal by this channel information, and shows that by display interface relevant dropout information is with reminding user.
In the embodiment of the present invention, at signal detector 30, dropout do not detected, continue to be switched to next input channel and carry out signal loss detection.
The embodiment of the present invention selects to need the input channel of detection by display interface, the input channel information that control module 20 sends according to display interface, the input channel of cyclic switching matrix is connected with signal detector 30 test sides, can realize whole input signals is carried out to cycle detection.
Above-mentioned matrix comprises AV matrix, VGA matrix and/or HDMI matrix, and the output channel of this matrix test side corresponding with signal detector connects, and is respectively used to AV signal, VGA signal and HDMI input; Above-mentioned input channel can be input channel, the input channel in VGA matrix and/or the input channel in HDMI matrix in AV matrix.Concrete, if this input channel is 1 to 3 input channel of AV matrix and 4 to 6 input channels of VGA matrix, control module 20 can be controlled it and first 1 of AV matrix to 3 input channels be detected, 4 to 6 input channels that are then switched to VGA matrix detect.It should be noted that in the present embodiment and detect according to said sequence, can also be other detection order according to actual conditions in other embodiment, at this, do not limit.
Further, control module 20 comprises receiving element 201 and memory cell 202, and receiving element 201 is for receiving the information of input channel, and memory cell 202 is for the information of temporary this input channel.At receiving element 201, receive after the information of the input channel that display interface sends, by memory cell 202, kept in, control module 20 is according to the information of the input channel in memory cell 202, the switching of gating matrix is switched and is connected with signal detector 30 with the passage of matrix, for detector 30, detects.Concrete, control module 20 gating matrixs, according to channel number successively switching channel, when all passages of one of them matrix have switched, will be switched to another matrix, all passages to all matrixes have all switched, and complete once patrolling and examining all input signals.It should be noted that according to actual conditions and can also sequentially patrol and examine according to other.
Lossing signal processing unit 203, for receiving and control the relevant information of the passage of the described lossing signal of display module 10 demonstration.In the embodiment of the present invention, the relevant information of the passage of the lossing signal that lossing signal processing unit 203 can send by the mode received signal detector 30 of serial communication, and the relevant information of the passage of analysis lossing signal.The relevant information of the passage of this lossing signal comprises the type of matrix and the input channel of matrix.Lossing signal processing unit 203 exports the result of above-mentioned analysis to display module 10, and by display module 10, shows signal type and the corresponding input channel of lossing signal, with reminding user, the circuit of this passage is checked.
The embodiment of the present invention selects to need the input channel of detection by display interface, the input channel information that control module 20 sends according to display interface, the input channel cyclic switching of gating matrix is connected with the test side of signal detector 30, by display interface, shows input signal drop-out.Can realize whole input signals is carried out to cycle detection, and the channel information of display loss, reminding user, it is simple to operate, can reduce user's workload.
These are only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (8)
1. a method for input signal loss detection, is characterized in that, comprising:
By display interface, select to need the input channel of detection, and export the information of described input channel, the type that the information of described input channel is input channel and channel number;
Control module receives the information of described input channel, and being connected according at least one input channel in the information of described input channel successively cyclic switching matrix and signal detector;
Whether the input signal that signal detector judgement is switched after input channel is lost;
If so, signal detector is sent to control module by the information of this passage, and control module continues to be switched to next passage and carries out signal loss detection; Described signal detector detects and switches after input channel, judges whether input signal is lost to comprise:
By detecting the synchronizing signal of AV signal, judge the validity of AV signal;
By detecting a row sequential of VGA signal, judge the validity of VGA signal;
By detecting the sequential of HDMI signal and the validity that HDMI signal data judges HDMI signal;
The described synchronizing signal by detection AV signal judges that the validity of AV signal comprises:
By the input clamp circuit correction DC shift of setovering line by line;
By low pass filter, reduce look burst, colourity and noise and avoid wrong synchronous detection;
By synchronizing indicator and the monitoring of LOS filter, be greater than the lock-out pulse of synchronization minimum voltage.
2. the method for input signal loss detection as claimed in claim 1, is characterized in that, the information of the described input channel of described reception specifically comprises:
Receive the information of described input channel;
The information of temporary described input channel.
3. the method for input signal loss detection as claimed in claim 2, is characterized in that, after the relevant information of passage of carrying out described Out-Lost signal, also comprises:
Control module receives and controls the relevant information that display interface shows the passage of described lossing signal.
4. the method for the input signal loss detection as described in claims 1 to 3 any one, is characterized in that, described matrix comprises AV matrix, VGA matrix and/or HDMI matrix.
5. a device for input signal loss detection, is characterized in that, comprising:
Display module, for selecting to need the input channel of detection, and exports the information of described input channel, the type that the information of described input channel is input channel and channel number;
Control module, for receiving the information of described input channel, and being connected according at least one input channel in the information of described input channel successively cyclic switching matrix and signal detector;
Signal detector, for judging whether the input signal switching after input channel is lost; When input signal loss being detected, signal detector is sent to control module by the information of this passage, and control module continues to be switched to next passage and carries out signal loss detection; Described signal detector comprises:
AV detecting unit, for judging the validity of AV signal by detecting the synchronizing signal of AV signal;
VGA detecting unit, for judging the validity of VGA signal by detecting a row sequential of VGA signal;
HDMI detecting unit, for by detecting the sequential of HDMI signal and the validity that HDMI signal data judges HDMI signal;
Described AV detecting unit comprises input clamp circuit, low pass filter, synchronizing indicator and LOS filter, and described input clamp circuit is revised DC shift for setovering line by line; Described low pass filter is avoided wrong synchronous detection for reducing look burst, colourity and noise; Described synchronizing indicator and LOS filter are for monitoring the lock-out pulse that is greater than synchronization minimum voltage.
6. the device of input signal loss detection as claimed in claim 5, is characterized in that, described control module comprises:
Receiving element, for receiving the information of described input channel;
Memory cell, for the information of temporary described input channel.
7. the device of input signal loss detection as claimed in claim 6, is characterized in that, described control module also comprises:
Dropout processing unit, shows the relevant information of the passage of described lossing signal for receiving and control display module.
8. the device of the input signal loss detection as described in claim 5 to 7 any one, is characterized in that, described matrix comprises AV matrix, VGA matrix and/or HDMI matrix.
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| CN104020757A (en) * | 2014-05-23 | 2014-09-03 | 无锡市崇安区科技创业服务中心 | Method for detecting input signal of microcontroller |
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| CN101815195A (en) * | 2010-02-03 | 2010-08-25 | 许耿铭 | Audio-video switching method, system and switcher used by same |
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