CN102075720B - Device and method for detecting plug wire at video output port and video play device - Google Patents
Device and method for detecting plug wire at video output port and video play device Download PDFInfo
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Abstract
The invention discloses a device and a method for detecting a plug wire at a video output port, a device and a method for detecting a pull wire at the video output port, and a video play device. The device for detecting the plug wire comprises a pull-up resistor, a comparator and a detection determination module, wherein the pull-up resistor is used for pulling up the voltage of the video output port to power supply voltage; the comparator is used for comparing the voltage of the video output port with a plug wire detection threshold value; and the detection determination module is used for detecting the plug wire according to a comparison result. In the device for detecting the pull wire, one input end of a comparator is connected with the video output port through a third switch, and a control circuit switches off the third switch only when the output signal of the video output port meets the set requirement in the process of detecting the pull wire. Static current does not exist in the process of detecting the plug wire, and current only exists at the moment of plugging a cable, so that the power consumption of a circuit is lower; an amplifier design is not needed, so that the design of the circuit is simplified, and the area of the circuit is reduced; and a removing mechanism is provided in the method for detecting the plug wire, and a region signal is selected to be detected in the method for detecting the pull wire, so that the problem that a de-twitter mechanism fails can be solved.
Description
Technical field
The present invention relates to the video output interface field, relate in particular to a kind of video-out port plug line detector and method and video play device.
Background technology
Video-out port divides analog signal interface and digital signal interface two big classes.Analog signal interface mainly contains the composite video broadcast singal, and (Composite Video Broadcast Signal, CVBS) (Separate Video is S-video) with several types of color difference components YPbPr terminals (terminal also weighs) for interface, S terminal.Digital signal interface mainly be at present HDMI (High Definition Multimedia Interface, HDMI).
The video-out port of video player and the connection status of display device detect extremely important; Because video player starts when video-out port is connected with display device detecting automatically, and break off with display device and closing automatically when being connected detecting video-out port.Player for multi-format output also can detect according to the connection status of video-out port and display device, and the video that produces corresponding form is automatically exported, and is user-friendly.
For digital signal interface HDMI, interface protocol has defined the mechanism of transmitting the HDMI connection status.But, then there is not puppy parc to define this mechanism for analog signal interface such as CVBS interface, S terminal and YPbPr terminal.
In order to reach the purpose that detects the analog signal interface connection status, application number is that 03154580.7 Chinese patent provides a kind of apparatus and method that detect analog video signal interface connection status, its objective is whether detect the player port has cable to insert.As shown in Figure 1, the apparatus structure of the detection analog signal interface connection status that is provided is:
Be provided with access circuit 52, output circuit 54 and output 66 in the playing device 50,, be provided with motor 60A and read head 60B in the memory circuit 52, read digital sound image signal 61A to separate from CD 60C to be electrically connected to system of sound image 58 via output cable 56.Be provided with signal circuit 62 in the output circuit 54, this signal circuit 62 can convert digital sound image signal 61A into simulated sound image signal 61B.This simulated sound image signal 61B exports system of sound image 58 to via output port 64, output 66 and output cable 56.Be provided with control circuit 72, comparator 74, commutation circuit 76 and amplifier 78 in the judge module 70.Commutation circuit 76 is selected one and is exported comparator 74 1 ends under the control of control circuit 72 in detection threshold voltage Vd and signal threshold value voltage Vs.Amplifier 78 switches the various signals magnification ratio under the control of control circuit 72.Control circuit 72 judges according to the comparative result of comparator 74 whether output 66 has been connected to output cable 56.Control circuit 72 itself then can be provided with lock-in circuit 80A and control logic 80B, and lock-in circuit 80A is used for receiving, storing the comparative result of comparator 74; According to the data of lock-in circuit 80A storage, control logic 80B can realize the various controlled function of control circuit 72.
Utilize said apparatus carry out plug wire with pull out line based on principle be: shown in Fig. 2 a; When output cable 56 inserts; Output cable 56 characteristic impedance Zc own are equivalent to signal circuit 62 and itself are in parallel in the output impedance Zo of node N1, and it can be represented by a total impedance Zt.As shown in Figure 3, when output cable 56 was extracted, signal circuit 62 was at the only remaining impedance Z o of total output impedance of node N1.Equivalent total impedance Zt after the parallel connection must be less than Zo.Therefore, when output cable 56 inserted, the signal voltage of node N1 can diminish, and when output cable 56 was extracted, it is big that the signal voltage of node N1 can become.
Utilize said apparatus to realize that pulling out line detecting method is specially based on above-mentioned principle:
Shown in Fig. 2 a and Fig. 2 b, control circuit 72 enabling signal circuit 62 carry out digital-to-analogue conversion, make circuit working in normal mode, start to pull out the line detection; Control circuit 72 control amplifiers 78 use less signal magnification ratio, and commutation circuit 76 is switched to Vs; According to the comparative result of comparator 74, whether the signal voltage of decision node N1 is greater than Vs; If not, continuing to pull out line according to comparative result detects; In this way, the signal voltage that promptly detects node N1 is by less than Vs (can referring to the time period before the ta0 among Fig. 4) when changing into greater than Vs (ta0 among Fig. 4～ta1 time period), confirms that output cable 56 extracts.
Utilize said apparatus to realize that the plug wire detection method is specially based on above-mentioned principle:
Shown in Fig. 3 a and Fig. 3 b, control circuit 72 stop signal circuit 62 carry out digital-to-analogue conversion, make circuit working in battery saving mode, start plug wire and detect; Control circuit 72 control signal circuit 62 provide low-power detection signal 61C to node N1.In order to save power consumption, low-power detection signal 61C is that less direct current detects electric current.Control circuit 72 control amplifiers 78 use bigger signal magnification ratio, and commutation circuit 76 is switched to Vd.According to the comparative result of comparator 74, whether the signal voltage of decision node N1 is less than Vd; If not, continuing to carry out plug wire according to comparative result detects; If the signal voltage that promptly detects node N1 is by when changing into less than Vd (ta2 among Fig. 4～ta3 time period), confirming that output cable 56 inserts output 66 greater than Vd (ta1 among Fig. 4～ta2 time period).
Because simulated sound image signal 61B is generally time varying signal; In order to prevent at normal mode since simulated sound image signal 61B the time become the node N1 voltage cause greater than Vs0; Also provide in the said method pulling out the mechanism of trembling of going of line detection, as shown in Figure 5, detect node N1 voltage constantly greater than Vs0 at tb1; When detecting the number of times accord with expectation value of node N1 voltage leap Vs0 afterwards in a period of time T, think that then exporting cable 56 extracts.
Above-mentioned existing techniques in realizing stube cable whether on the detection analog signal interface, and be according to the startup of signal circuit in the decision playing device with the testing result and close.But above-mentionedly analog signal interface is pulled out line and plug wire detection method and device following shortcoming is arranged:
1) lack in the process that the detection cable inserts and go the mechanism of trembling, as shown in Figure 5, when detecting node N1 voltage, think that promptly cable inserts less than Vd0.Owing to have mechanical shaking on the interface, Zc can connect and break off repeatedly in the cable insertion process, causes entire circuit between connection and disconnection two states, frequently to be switched;
2) cable is extracted detection continuously effective during vision signal (being the simulated sound image signal) normal transmission, and because node N1 voltage is relevant with video signal characteristic.If video amplitude is too small, even cable is extracted, node N1 voltage amplitude also possibly can't reach Vs, cause pulling out the line detection and remove to tremble mechanism failure, even the whole line that pulls out detects inefficacy;
3) in the checkout gear design, following shortcoming is arranged: detect electric current because signal circuit provides smaller direct current during at battery saving mode, so compare after needing amplifier that node N1 voltage amplitude is amplified again, Design of Amplifier has increased circuit area.
Summary of the invention
According to a kind of video-out port plug line detector and method and video play device, design of optimization of video output terminal port communicating condition testing circuit and detection method are provided in the embodiment of the invention.
The present invention provides a kind of video-out port plug wire checkout gear, comprising:
Pull-up resistor, two ends are connected with power supply with video-out port respectively, and the voltage of said video-out port is drawn on supply voltage;
Comparator is used for the size of the voltage and the plug wire detection threshold of more said video-out port;
Detect determination module,, carry out the plug wire detection whether said video-out port has been connected to the output cable according to the comparative result of said comparator; Said detection determination module comprises:
The first de-twitter circuit start-up circuit during less than the plug wire detection threshold, starts first de-twitter circuit at the voltage of video-out port;
First de-twitter circuit; When plug wire detects; Set the plug wire assay intervals time, every comparative result at a distance from the once said comparator output of plug wire assay intervals time detecting is set plug wire and is detected number of times; The voltage that detects the number of times video-out port at continuous plug wire is confirmed to detect video-out port and has been connected to the output cable during all less than the plug wire detection threshold;
The first de-twitter circuit shut-off circuit does not reach the voltage during all less than the plug wire detection threshold that detects the number of times video-out port at continuous plug wire at said first de-twitter circuit, closes said first de-twitter circuit.
The present invention also provides a kind of video-out port to pull out line detector, comprising:
Comparator, one of them input connects said video-out port through the 3rd switch, the voltage of more said video-out port and the size of pulling out the line detection threshold when the 3rd switch closure;
Detect determination module, according to the comparative result of said comparator, carry out said video-out port whether broken off be connected with the output cable pull out the line detection;
Control circuit pulls out between the line detection period, when the satisfied setting of the output signal of video-out port requires, and closed said the 3rd switch, otherwise break off said the 3rd switch; Said detection determination module comprises:
The second de-twitter circuit start-up circuit when pulling out the line detection threshold, starts second de-twitter circuit at the voltage of video-out port;
Second de-twitter circuit; When pulling out the line detection; The line assay intervals time is pulled out in setting, and is every at a distance from the comparative result that pulls out the once said comparator output of line assay intervals time detecting, sets and pull out line detection number of times; Pulling out voltage that line detects the number of times video-out port continuously all when pulling out the line detection threshold, confirming to detect video-out port and broken off and export being connected of cable;
The second de-twitter circuit shut-off circuit does not reach at said second de-twitter circuit and to pull out voltage that line detects the number of times video-out port continuously all when pulling out the line detection threshold, closes said second de-twitter circuit.
The present invention also provides a kind of plug wire detection method, comprising:
The size that compares video-out port voltage and plug wire detection threshold;
According to said comparative result,, whenever confirm the voltage of a video-out port and the comparative result of plug wire detection threshold at a distance from the plug wire assay intervals time when the voltage of video-out port during less than the plug wire detection threshold;
When continuous plug wire detects voltage that number of times confirms video-out port all less than the plug wire detection threshold, confirm to detect video-out port and be connected to the output cable.
The present invention also provides a kind of line detecting method that pulls out, and comprising:
Pulling out between the line detection period; Export periodicity output, amplitude fluctuations in setting range, when continuous output time surpasses the regional signal of setting-up time length at video-out port; Confirm that the output signal satisfies the setting requirement; Closure is connected the 3rd switch between comparator input terminal and the video-out port, by the voltage of the more said video-out port of said comparator and the size of pulling out the line detection threshold;
Description of drawings
According to the comparative result of said comparator, carry out said video-out port whether broken off is connected with the output cable pull out line detection.
The present invention also provides a kind of video play device, comprising:
Signal circuit outputs to video-out port after converting digital video signal into analog video signal during unlatching;
Above-mentioned video-out port plug wire checkout gear carries out the plug wire whether video-out port be connected to the output cable and detects, and said signal circuit is closed when plug wire detects, has been connected to and opens when exporting cable detecting video-out port; And/or
Above-mentioned video-out port pulls out line detector; Carry out video-out port and whether broken off the plug wire detection that is connected with the output cable; Said signal circuit works on when line detects pulling out, and breaks off with exporting and closing when cable is connected detecting video-out port.
Utilize video-out port plug line detector provided by the invention and method and video play device; Has following beneficial effect: owing to when carrying out the plug wire detection, connect pull-up resistor at video-out port; Therefore the voltage with video-out port draws on supply voltage; And when the video-out port plug wire, because the equivalent resistance of the playback equipment that connects is all smaller, much smaller than the resistance of pull-up resistor.According to the electric resistance partial pressure principle; Port voltage reduces greatly; Change in voltage clearly under two kinds of situation; The present invention extraly provides under the situation that detects electric current and design amplifier to output port not needing like this, can realize exactly that plug wire detects, and has reduced the power consumption of entire circuit and has saved circuit area.
Fig. 1 is for carrying out the device that the video-out port connection status detects in the prior art;
Fig. 2 a is corresponding electrical circuits figure when video-out port is connected with the output cable in the prior art;
Fig. 2 b is that prior art is pulled out the line detecting method flow chart;
Fig. 3 a is corresponding electrical circuits figure when video-out port does not connect the output cable in the prior art;
Fig. 3 b is a plug wire detection method flow chart in the prior art;
Fig. 4 is for inserting the output cable and extracting the corresponding change in voltage figure of output cable in the prior art;
Fig. 5 pulls out the change in voltage figure that line goes to insert the output cable under the mechanism of trembling and extracts output cable correspondence for introducing in the prior art;
Fig. 6 is the sketch map that video play device is connected with display device;
Embodiment
Fig. 7 A accordings to when plug wire detects in the embodiment of the invention, video-out port plug wire testing circuit when inserting the output cable;
Fig. 7 B accordings to when plug wire detects in the embodiment of the invention, video-out port plug wire testing circuit when inserting the output cable;
Video-out port pulled out line detection circuit when Fig. 8 pulled out the line detection for accordinging in the embodiment of the invention;
Fig. 9 is the field blanking signal graph according to NTSC-M standard in the embodiment of the invention;
Figure 10 is for accordinging to video-out port plug wire testing process figure in the embodiment of the invention;
Figure 11 is for pulling out line testing process figure according to video-out port in the embodiment of the invention.
Below in conjunction with accompanying drawing and embodiment video-out port provided by the invention is plugged line detector and method and video play device, illustrate in greater detail.
As shown in Figure 6; Video-out port 60 plug wires of conventional video play device are connected with display device; Video play device need obtain the connection status of video-out port 60 and display device, thereby opens or stop its inner signal circuit such as digital to analog converter DAC carries out digital-to-analogue conversion.When the plug line of video-out port 60 detects the method that the application background technology provided, have that plug wire detects that power consumption is big, plug wire detects not have and goes the mechanism of trembling, pulls out line and detect and go to tremble mechanism problem such as inefficacy easily.For the further connection status detection of optimization of video output port 60, according in the first embodiment of the present invention, a kind of video-out port plug wire checkout gear is provided, shown in Fig. 7 A, this circuit comprises:
Pull-up resistor R1, two ends are connected with power supply with video-out port 60 respectively, video-out port 60 break off with export the state that cable 56 is connected under, the voltage 60 of video-out port is drawn on supply voltage V; Comparator 20 is used for the size of the voltage and the plug wire detection threshold V1 of more said video-out port 60; Detect determination module 30,, carry out the plug wire detection whether video-out port 60 has been connected to output cable 56 according to the comparative result of comparator 20.The present invention has added in video-out port connection status testing circuit act as the pull-up resistor that video-out port voltage is drawn on supply voltage; Thereby be implemented in video-out port break off with export the state that cable is connected under voltage is also arranged; Thereby do not need direct current detection electric current and saved the amplifier that direct current detection electric current is amplified; Therefore do not have quiescent dissipation, thereby reduced system power dissipation; Need not Amplifier Design in addition, simplified circuit design and reduced circuit area.Through existing video-out port voltage detecting mechanism, just carry out the video-out port connection status like voltage and detect according to video-out port 60, can realize under the state of saving circuit area and power consumption that the video-out port connection status detects.
Because video-out port 60 is pulling out under the line states; The effect of pull-up resistor R1 is that the current potential of video-out port 60 is clamped at a high potential; And behind video-out port 60 plug wires, because the equivalent resistance R3 of display device is smaller, be 75 ohm like the equivalent resistance of television set; The insertion of therefore exporting cable 56 is equivalent to the resistance of external one 75 ohm of node N; Shown in Fig. 7 B, thereby with respect to connecting the very little pull down resistor of resistance at video-out port 60, so the voltage of video-out port 60 is drop-down to the ground wire current potential., can carry out plug wire according to change in voltage and detect with to pull out under two kinds of situation of line change in voltage very obvious at plug wire.With respect to prior art, said apparatus of the present invention does not have quiescent dissipation, only after cable inserts, has electric current, and need not consider Design of Amplifier, therefore can under the situation of low-power consumption and saving circuit area, realize that plug wire detects.
Preferably; Pull-up resistor R1 comprises one or at least two interconnective resistance, and the resistance form of pull-up resistor R1 is not limit in the present embodiment, as long as the resistance of pull-up resistor R1 is enough big; Can realize video-out port 60 voltages are drawn on supply voltage, reach clamped and get final product at high potential.
Above-mentioned plug wire detection threshold V1 preferably adopts the voltage of setting between supply voltage and the ground wire voltage near ground wire.Above-mentioned detection determination module 30; When the voltage of video-out port 60 is not less than plug wire detection threshold V1; Confirm to detect video-out port 60 and be not connected to output cable 56;, confirm to detect video-out port 60 and be connected to output cable 56 during at the voltage of video-out port 60 less than the plug wire detection threshold.
General comparator, is then exported the result and will be produced corresponding shake if comparison signal has small interference near threshold value in that comparison signal such as video-out port voltage and threshold value such as V1 are compared.For fear of this situation, the above-mentioned comparator 20 preferred hysteresis comparators that adopt in the present embodiment, hysteresis comparator is introduced positive feedback in circuit can overcome above-mentioned shortcoming, and the internal structure of hysteresis comparator can adopt existing structure, no longer details here.Comparator 20 is through the different comparative result of output different level signals reaction; When being not less than plug wire detection threshold V1 like voltage at video-out port 60; Output low level, at the voltage of video-out port 60 during less than plug wire detection threshold V1, the output high level.
According in the embodiments of the invention; Can pull-up resistor R1 be designed to the controlled form of switch, shown in Fig. 7 A, the end of pull-up resistor R1 is connected with video-out port 60 through first K switch 1 of series connection; The other end is connected with power supply V; This device also comprises: control circuit 40, closed first K switch 1 when carrying out the plug wire detection detects and breaks off first K switch 1 when video-out port 60 has been connected to output cable 56.Pull-up resistor R1 is designed to the controlled form of switch, can prevents in the normal output procedure of analog video signal, the access meeting of pull-up resistor R1 exerts an influence to the output signal.
Preferably; The plug wire checkout gear also comprises: pull down resistor R2; One end is connected with ground, and the other end is connected with video-out port 60 through the second switch K2 of series connection, and the resistance of pull down resistor R2 is mated through the display device equivalent resistance that output cable 56 is connected with video-out port 60; Control circuit 40; Carrying out breaking off second switch K2 when plug wire detects; Detect video-out port and be connected to closed second switch K2 when exporting cable; Thereby can start and pull out line and detect, pull out line detect can adopt existing pull out that line testing process or the following embodiment of the present invention provided pull out the line testing process.
There is jitter phenomenon in the plug wire process, in the plug wire process, can connects repeatedly and break off like 75 Ohmic resistances with the TV equivalence.It is stable again that this phenomenon can cause the output of comparator 20 between low level and high level, to shake a period of time.Simultaneously, external circuit disturbs the change in voltage that also possibly cause video-out port 60.So insert to the output cable for fear of wrong detection, the mechanism of trembling of going when plug wire detects is very important.
Detecting determination module 30 further comprises:
The first de-twitter circuit start-up circuit 30a at the voltage of video-out port during less than plug wire detection threshold V1, as detects comparator 20 outputs when low level becomes high level, starts the first de-twitter circuit 30b;
The first de-twitter circuit 30b; When plug wire detects; Set the plug wire assay intervals time, the first de-twitter circuit 30b starts the back comparative result of comparator of plug wire assay intervals time detecting 20 outputs at interval, sets plug wire and detects number of times; When the first de-twitter circuit 30b detects voltage that number of times confirms video-out port 60 less than plug wire detection threshold V1 at continuous plug wire, confirm to detect video-out port 60 and be connected to output cable 56; Particularly, can set the plug wire assay intervals time through timer, utilize counter to carry out plug wire and detect the number of times statistics, the comparative result that obtains in the time of can be with the output of each detection comparator 20 is preserved;
The first de-twitter circuit shut-off circuit 30c; The first de-twitter circuit 30b do not reach detect the number of times video-out port at continuous plug wire voltage all less than the plug wire detection threshold; Promptly do not reach and set that plug wire detects number of times and the voltage of confirming video-out port when being not less than plug wire detection threshold V1, close de-twitter circuit 30b.
According in the second embodiment of the invention, provide a kind of video-out port to pull out line detector, as shown in Figure 8, this device comprises:
Because the embodiment of the invention is only pulled out line and is detected between the given period that the satisfied setting of above-mentioned output signal requires; Need not gather the voltage of video-out port during other; Therefore can select to pull out the line detection during the stable output signal; Pull out the reliability that line detects thereby improved, avoid the line detection occurring pulling out and remove to tremble mechanism failure.
Particularly; Above-mentioned detection determination module 30 is according to the comparison of comparator 20; Be not more than at the voltage of video-out port 60 and pull out line detection threshold V2; Confirm to detect video-out port 60 and do not break off the line that pulls out that is connected with output cable 56 and detect, at the voltage of video-out port 60 greater than pulling out line detection threshold V2, confirm to detect video-out port 60 broken off with export that cable 56 is connected pull out the line detection.
Above-mentioned when pulling out line detection threshold V2 and can normally export according to analog video signal corresponding port voltage set, preferably set between this port voltage and two times of these port voltages voltage near mid portion.
Detect for the above-mentioned line that pulls out, a kind of mechanism of trembling of going is provided in the present embodiment, said detection determination module 30 comprises:
The second de-twitter circuit start-up circuit 31a when pulling out line detection threshold V2, starts the second de-twitter circuit 31b at the voltage of video-out port;
The second de-twitter circuit 31b; When pulling out the line detection; The line assay intervals time is pulled out in setting, and is every at a distance from the comparative result that pulls out the once said comparator output of line assay intervals time detecting, sets and pull out line detection number of times; Pulling out voltage that line detects the number of times video-out port continuously all when pulling out the line detection threshold, confirming to detect video-out port and broken off and export being connected of cable;
The second de-twitter circuit shut-off circuit 31c does not reach at the said second de-twitter circuit 31b and to pull out voltage that line detects the number of times video-out port continuously all when pulling out the line detection threshold, closes the second de-twitter circuit 31b.
After video-out port 60 connects output cable 56; Has the regional signal that periodicity is exported, amplitude fluctuations surpasses the setting-up time threshold value at setting range, continuous output time in the analog video signal of output; When detection determination module 30 pulls out the line detection in the present embodiment, be chosen in and pull out the line detection during video-out port 60 is exported the above-mentioned zone signals.Above-mentionedly pull out the line assay intervals time and specifically can supply to pull out the time that line detects and confirm according to the duration.
About the above-mentioned zone signal, be example with the TV signal, TV signal is that delegation's one line scanning is carried out; Television set is scanning the right side from a left side, when scanning next line again, need close electron gun; Horizontal blanking is named in this action; When having scanned a field signal and change another field signal again, scanning beam is got back to the upper left corner from the lower right corner, and the action of closing electron gun this time is field blanking.Therefore, the beginning of every of TV signal or every frame all has the blanking interval of one section several rows, corresponding signal when being illustrated in figure 9 as the field blanking of NTSC-M standard of CVBS (composite video TV signal) interface of TV.Wherein 10～19 row and 273～281 row are blank lines.To be delegation's signal have an appointment the line synchronizing signal about 5us except the front characteristics of blank lines, and other times (about 57us) signal all keeps the blanking level about 0.3V.If the output cable has pulled out line, voltage this moment then should be about 0.6V.
Can select the horizontal blanking signal in the blanking signal of blanking interval output of every or every frame analog video signal in the present embodiment; Between this horizontal blanking signal period of output; Carry out video-out port whether broken off is connected with the output cable pull out line detection; As compare video-out port voltage and the size of pulling out line detection threshold (desirable 0.3V is to the median of 0.6V), and comparative result is preserved.If the several times result shows the video-out port voltage that detects the moment greater than pulling out the line detection threshold continuously, confirm that then cable breaks off.
Except above-mentioned CVBS interface, for TV signal such as 480p, 720p and the 1080p etc. of other interfaces such as YPbPr or other resolution, all exist similar periodically blank lines can supply to detect, just row length is different with the blanking level duration.Therefore the above-mentioned line that pulls out that provides of present embodiment detects that to go the mechanism of trembling be blanket.
In the third embodiment of the present invention; The plug wire checkout gear that provides among first embodiment comprises the line detector that pulls out that second embodiment provides, and promptly second embodiment provides pulls out the plug wire checkout gear that line detector comprises that first embodiment provides, for control circuit 40; When beginning to carry out the plug wire detection; Break off second switch K2 and closed first K switch 1, shown in Fig. 7 A and Fig. 7 B, detect video-out port 60 and be connected to when exporting cable 56 detecting determination module 30; Breaking off above-mentioned first K switch, 1 back closed second switch K2, as shown in Figure 8.
Preferably; Above-mentioned pull down resistor R2 comprises one or at least two interconnective resistance; The internal structure of pull down resistor R2 is not limit in the present embodiment; As long as equivalent resistance and display device equivalence resistance are complementary, because the function that realizes is different, the equivalent resistance of pull-up resistor R1 is the equivalent resistance that is far longer than pull down resistor R2; The equivalent resistance of the display device that the resistance of pull down resistor R2 is connected with video-out port 60 warp output cables 56 in the present embodiment is complementary, and can avoid signal reflection problem like this.When to adopt equivalent resistance be 75 ohm resistance like display device, the equivalent resistance of this pull down resistor R2 adopt near or equal 75 ohm resistance.The equivalent resistance item coupling of the resistance of pull down resistor R2 and display device is connected with the display device disconnection when occurring pulling out line action video output port 60, and the equivalent resistance of video output terminals can be thought and becomes R2 by R2/2.Resistance value rises near original 2 times and causes the N point voltage also to rise to original 2 times.Therefore the change in voltage scope is also bigger, can accurately pull out line and detect.
Among the accompanying drawing 7A that relates in the above-mentioned enforcement of the present invention, Fig. 7 B and Fig. 8; Video-out port plug wire checkout gear with pull out line detector and be integrated in the video play device; Certainly, can not be integrated in video play device yet and place the video play device external circuit, when being integrated in video play device; Constitute the video play device that is provided in the fourth embodiment of the invention; Referring to above-mentioned accompanying drawing 7A, 7B and Fig. 8, this video play device comprises: signal circuit outputs to video-out port after converting digital video signal into analog video signal during unlatching; The video-out port plug wire checkout gear that first embodiment of the invention provided carries out said video-out port and whether has been connected to the plug wire detection of output cable and has pulled out the line detection; Said signal circuit is closed when plug wire detects, and has been connected to output and opens during cable detecting video-out port; And/or the video-out port that second embodiment of the invention provided pulls out line detector; Carry out video-out port and whether broken off the plug wire detection that is connected with the output cable; Above-mentioned signal circuit; Whether broken off pulling out of being connected with display device and worked on when line detects carrying out said video-out port, broken off exporting and close when cable is connected detecting video-out port with display device.
According in the fifth embodiment of the present invention, a kind of plug wire detection method of the device that provides based on above-mentioned first embodiment is provided, comprising: the size of video-out port voltage and plug wire detection threshold V1 relatively; According to said comparative result,, whenever confirm the voltage of a video-out port and the comparative result of plug wire detection threshold at a distance from the plug wire assay intervals time when the voltage of video-out port during less than the plug wire detection threshold; When continuous plug wire detects voltage that number of times confirms video-out port all less than the plug wire detection threshold, confirm to detect video-out port and be connected to the output cable.
Present embodiment provides the mechanism of trembling of going in the plug wire testing process, thereby avoids in the cable insertion process, having mechanical shaking owing on the interface, and equivalent resistance can connect and break off repeatedly, causes entire circuit between connection and disconnection two states, frequently to be switched.
In the present embodiment, be connected to video-out port 60, the voltage of video-out port 60 is pulled to supply voltage through pull-up resistor R2; The size that compares video-out port 60 voltages and plug wire detection threshold; According to comparative result, carry out the plug wire detection whether said video-out port 60 has been connected to output cable 56.
In the present embodiment, when confirming that detecting video-out port 60 has been connected to output cable 56, disconnection pull-up resistor R1 is connected with video-out port 60; Pull down resistor R2 is connected to video-out port 60, and the line detection is pulled out in startup.The resistance of pull down resistor R2 is mated through the display device equivalence resistance that output cable 56 is connected with video-out port 60.
According in the sixth embodiment of the present invention; A kind of line detecting method that pulls out based on second embodiment device also is provided; Comprise: pulling out between the line detection period; Confirm satisfied the setting when requiring of output signal of video-out port, closure is connected the 3rd switch between comparator input terminal and the video-out port, by the voltage of the more said video-out port of said comparator and the size of pulling out the line detection threshold; According to the comparative result of said comparator, carry out said video-out port whether broken off is connected with the output cable pull out line detection.
The embodiment of the invention provides the mechanism of trembling of going to pulling out the line detection, has improved and has pulled out the reliability that line detects.
Preferably; The output signal of confirming video-out port satisfies the setting requirement; Specifically comprise: periodically output, amplitude fluctuations are in setting range, when continuous output time surpasses the regional signal of setting-up time length in video-out port output, and definite output signal satisfies sets requirement.
After said video-out port 60 connects the output cable; Has the regional signal that periodicity is exported, amplitude fluctuations surpasses the setting-up time threshold value at setting range, continuous output time in the analog video signal of output; In order to realize that pulling out the line detection goes to tremble; Present embodiment just pulls out the line detection according to the voltage of video-out port 60; Specifically comprise: be chosen in said video-out port and export during the said regional signal, every at a distance from pulling out the line assay intervals time voltage of confirming a video-out port and the comparative result that pulls out the line detection threshold; Detect voltage that number of times confirms said video-out port all when pulling out the line detection threshold pulling out line continuously, confirm that video-out port has broken off and exports being connected of cable.
The above-mentioned zone signal is the blanking signal of the blanking interval output of every or every frame analog video signal.Voltage according to video-out port just pulls out the line detection; Specifically comprise: select the horizontal blanking signal in the blanking signal of blanking interval output of every or every frame analog video signal; Between this horizontal blanking signal period of output, carry out video-out port 60 whether broken off is connected with output cable 56 pull out line detection.
In another preferred embodiment method of the present invention; The plug wire detection method that can utilize the foregoing description to provide is carried out plug wire and is detected; Utilizing the foregoing description to provide to pull out line detecting method to pull out line detects; The plug wire assay intervals time that relates to pull out the line assay intervals time and can be the same or different, set plug wire detect number of times with pull out line detection number of times can be identical also can be inequality, as long as reach the purpose of repeated detection.
Shown in figure 10, the preferred embodiment of the present invention realizes that the plug wire detection specifically comprises:
Step S101, closed first K switch 1, R1 is connected to video-out port with pull-up resistor, and video-out port voltage is pulled to supply voltage, detects thereby start plug wire;
Particularly, carry out the control of first K switch 1 and start the size that comparator compares video-out port voltage and plug wire detection threshold by control circuit 40.
Step S102 detects determination module according to comparative result, and whether the voltage of judging video-out port is less than plug wire detection threshold V1; If; Execution in step S103, if not, whether the voltage that the interval plug wire assay intervals time continues to judge video-out port is less than the plug wire detection threshold;
Step S103 starts the plug wire detection and goes to tremble, and particularly, starts the first de-twitter circuit 30b by the first de-twitter circuit start-up circuit 30a and goes to tremble detection, be i.e. the every comparative result at a distance from the once said comparator output of plug wire assay intervals time detecting of first de-twitter circuit;
Step S104 judges whether to satisfy and goes the condition of trembling, particularly; When the first de-twitter circuit 30b detects voltage that number of times confirms video-out port all less than plug wire detection threshold V1 at continuous plug wire, confirm to satisfy and go the condition of trembling, promptly confirm to detect video-out port and be connected to the output cable; Execution in step S105; Otherwise, confirm not satisfy the condition of trembling, execution in step S104a of going;
Step S104a closes the first de-twitter circuit 30b by the first de-twitter circuit shut-off circuit 30c, detects and to go to tremble thereby close plug wire, and whether turn back to voltage that step S102 rejudges video-out port less than the plug wire detection threshold;
Step S105 breaks off first K switch 1, and closed second switch K2, carry out digital-to-analogue conversion thereby start video play device startup DAC, and the line detection is pulled out in startup.
On the basis that above-mentioned plug wire detects, detect video-out port and be connected to when exporting cable, begin to pull out line and detect, shown in figure 11, the line detection of pulling out of carrying out video-out port in the present embodiment comprises:
Step S201 starts and pulls out the line detection;
Step S202 judges whether the output signal of video-out port satisfies the setting requirement, if execution in step S203 if not, proceeds to judge;
Periodically output, amplitude fluctuations are in setting range, when continuous output time surpasses the regional signal of setting-up time length characteristics as having in definite video-out port output, and definite output signal satisfies sets requirement, selects to pull out during this period the line detection
Step S203, closed the 3rd K switch 3, the voltage that judges whether to detect video-out port is greater than pulling out line detection threshold V2; If; Whether execution in step S204 if not, pulls out at interval voltage that the line assay intervals time proceeds to judge video-out port greater than pulling out the line detection threshold;
Step S204, startup is pulled out the line detection and gone to tremble, and promptly starts second de-twitter circuit by the second de-twitter circuit start-up circuit, and is every at a distance from the comparative result that pulls out a comparator output of line assay intervals time detecting;
Step S205 judges whether to satisfy the condition of trembling of going, and promptly second de-twitter circuit detects voltage that number of times detects video-out port all when pulling out the line detection threshold pulling out line continuously; Confirm to satisfy the condition of trembling of going; Confirm to detect that video-out port has broken off and being connected of output cable, execution in step S206, otherwise; Do not satisfy when going to tremble condition execution in step S205a;
Step S205a closes second de-twitter circuit by the second de-twitter circuit shut-off circuit, pulls out line and detects and to go to tremble thereby close, and whether turn back to voltage that step S203 rejudges video-out port greater than pulling out the line detection threshold;
Step S206, closed first K switch 1, and break off second switch K2 and close and pull out line and detect; And close video play device; Stop that signal circuit carries out digital-to-analogue conversion in the video play device, and break off second switch K2, carry out plug wire by plug wire detection method in the foregoing description once more and detect.
After the present invention utilizes video output terminals and display device is connected; Because the display device resistance value is smaller; Thereby the very little this point of outer meeting resistance; Above-mentioned video-out port plug line detector and method are provided, and above-mentioned display device is not limited to the television set of example, can also be other equipment that can receive and play analog video signal.Whether the present invention is connected to display device through detecting video-out port, can realize starting automatically or closing video play device, simplifies user's operation, reduces the player power consumption; Compared with prior art, the mechanism that the video player detection streamer inserts and extracts is more perfect, and the plug wire of avoiding prior art to exist detects and possibly have wrong detection, pulls out line and goes to tremble mechanism failure or pull out the problem that line detects inefficacy; Compared with prior art, plug line detection circuit scale is littler, and power consumption is lower.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1. a video-out port plug wire checkout gear is characterized in that, comprising:
Pull-up resistor, two ends are connected with power supply with video-out port respectively, and the voltage of said video-out port is drawn on supply voltage;
Comparator is used for the size of the voltage and the plug wire detection threshold of more said video-out port;
Detect determination module,, carry out the plug wire detection whether said video-out port has been connected to the output cable according to the comparative result of said comparator; Said detection determination module comprises:
The first de-twitter circuit start-up circuit during less than the plug wire detection threshold, starts first de-twitter circuit at the voltage of video-out port;
First de-twitter circuit; When plug wire detects; Set the plug wire assay intervals time, every comparative result at a distance from the once said comparator output of plug wire assay intervals time detecting is set plug wire and is detected number of times; The voltage that detects the number of times video-out port at continuous plug wire is confirmed to detect video-out port and has been connected to the output cable during all less than the plug wire detection threshold;
The first de-twitter circuit shut-off circuit does not reach the voltage during all less than the plug wire detection threshold that detects the number of times video-out port at continuous plug wire at said first de-twitter circuit, closes said first de-twitter circuit.
2. device as claimed in claim 1 is characterized in that, an end of said pull-up resistor is to be connected to video-out port through first switch of connecting, and this device also comprises:
Control circuit, closed first switch when carrying out the plug wire detection detects and breaks off first switch when video-out port has been connected to the output cable.
3. device as claimed in claim 2 is characterized in that, also comprises:
Pull down resistor, an end is connected with ground, and the other end is connected with said video-out port through the second switch of series connection, and the resistance of said pull down resistor is mated through the display device equivalent resistance that the output cable is connected with video-out port;
Said control circuit carrying out breaking off second switch when plug wire detects, detects video-out port and has been connected to closed second switch when exporting cable.
4. device as claimed in claim 3; It is characterized in that; Said pull-up resistor comprises one or at least two interconnective resistance, and said pull down resistor comprises one or at least two interconnective resistance, and the resistance of said pull-up resistor is greater than the resistance of said pull down resistor.
5. a video-out port pulls out line detector, it is characterized in that, comprising:
Comparator, one of them input connects said video-out port through the 3rd switch, the voltage of more said video-out port and the size of pulling out the line detection threshold when the 3rd switch closure;
Detect determination module, according to the comparative result of said comparator, carry out said video-out port whether broken off be connected with the output cable pull out the line detection;
Control circuit pulls out between the line detection period, when the satisfied setting of the output signal of video-out port requires, and closed said the 3rd switch, otherwise break off said the 3rd switch; Said detection determination module comprises:
The second de-twitter circuit start-up circuit when pulling out the line detection threshold, starts second de-twitter circuit at the voltage of video-out port;
Second de-twitter circuit; When pulling out the line detection; The line assay intervals time is pulled out in setting, and is every at a distance from the comparative result that pulls out the once said comparator output of line assay intervals time detecting, sets and pull out line detection number of times; Pulling out voltage that line detects the number of times video-out port continuously all when pulling out the line detection threshold, confirming to detect video-out port and broken off and export being connected of cable;
The second de-twitter circuit shut-off circuit does not reach at said second de-twitter circuit and to pull out voltage that line detects the number of times video-out port continuously all when pulling out the line detection threshold, closes said second de-twitter circuit.
6. a plug wire detection method is characterized in that, comprising:
The size that compares video-out port voltage and plug wire detection threshold;
According to said comparative result,, whenever confirm the voltage of a video-out port and the comparative result of plug wire detection threshold at a distance from the plug wire assay intervals time when the voltage of video-out port during less than the plug wire detection threshold;
When continuous plug wire detects voltage that number of times confirms video-out port all less than the plug wire detection threshold, confirm to detect video-out port and be connected to the output cable.
7. method as claimed in claim 6 is characterized in that said video-out port is connected with power supply through pull-up resistor, when confirming that detecting video-out port has been connected to the output cable, also comprises:
Break off being connected of said pull-up resistor and video-out port;
Pull down resistor is connected to video-out port, and the resistance of said pull down resistor and video-out port are complementary through the equivalent resistance of the display device that the output cable is connected;
Whether the startup video-out port has broken off the line that pulls out that is connected with the output cable is detected.
8. one kind is pulled out line detecting method, it is characterized in that, comprising:
Pulling out between the line detection period; Export periodicity output, amplitude fluctuations in setting range, when continuous output time surpasses the regional signal of setting-up time length at video-out port; Confirm that the output signal satisfies the setting requirement; Closure is connected the 3rd switch between comparator input terminal and the video-out port, by the voltage of the more said video-out port of said comparator and the size of pulling out the line detection threshold;
According to the comparative result of said comparator, carry out said video-out port whether broken off is connected with the output cable pull out line detection.
9. method as claimed in claim 8 is characterized in that, saidly pulls out line according to comparative result and detects, and specifically comprises:
Every at a distance from pulling out the line assay intervals time voltage of confirming a video-out port and the comparative result that pulls out the line detection threshold;
Detect voltage that number of times confirms said video-out port all when pulling out the line detection threshold pulling out line continuously, confirm that video-out port has broken off and exports being connected of cable.
10. method as claimed in claim 8 is characterized in that, said regional signal is the blanking signal of the blanking interval output of every or every frame analog video signal;
Select the horizontal blanking signal in the blanking signal of blanking interval output of every or every frame analog video signal, between this horizontal blanking signal period of output, closed said the 3rd switch.
11. a video play device is characterized in that, comprising:
Signal circuit outputs to video-out port after converting digital video signal into analog video signal during unlatching;
The arbitrary described video-out port plug wire checkout gear of claim 1～4; Carry out the plug wire detection whether video-out port has been connected to the output cable; Said signal circuit is closed when plug wire detects, and has been connected to output and opens during cable detecting video-out port; And/or
The described video-out port of claim 5 pulls out line detector; Carry out video-out port and whether broken off the plug wire detection that is connected with the output cable; Said signal circuit works on when line detects pulling out, and breaks off with exporting and closing when cable is connected detecting video-out port.
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| CN2010106082416A CN102075720B (en) | 2010-12-27 | 2010-12-27 | Device and method for detecting plug wire at video output port and video play device |
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| CN103378842B (en) * | 2012-04-19 | 2016-01-06 | 扬智科技股份有限公司 | Whether output circuit is connected to the method for transmission line with detecting connectivity port |
| CN102685431A (en) * | 2012-04-26 | 2012-09-19 | 华为技术有限公司 | VGA on-line detection method, circuit and digital video recorder |
| CN104426524A (en) * | 2013-09-06 | 2015-03-18 | 扬智科技股份有限公司 | Output circuit, method for detecting whether connecting port is connected to load or not and image output circuit |
| CN105092998A (en) * | 2014-05-19 | 2015-11-25 | 华为技术有限公司 | Interface detection circuit, device and method |
| CN104535851B (en) * | 2014-12-12 | 2018-02-13 | 惠州Tcl移动通信有限公司 | The quick determination method and system that a kind of Mobile terminal charger is extracted |
| CN106093542B (en) * | 2016-06-07 | 2019-09-17 | 深圳市航盛电子股份有限公司 | A kind of TMDS powerdown signal detection circuit and method |
| CN106303514B (en) * | 2016-09-08 | 2019-01-04 | 珠海全志科技股份有限公司 | Analog video interface detection circuit and its detection method, integrated chip |
| CN107645660A (en) * | 2017-09-08 | 2018-01-30 | 北京赛科世纪科技股份有限公司 | A kind of system and method for detecting analog video OIR |
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| CN1585030A (en) * | 2003-08-19 | 2005-02-23 | 扬智科技股份有限公司 | Outputting circuit for detecting cable connection on outputting end, related apparatus and method thereof |
| CN201657320U (en) * | 2010-06-12 | 2010-11-24 | 广东欧珀移动通信有限公司 | Earphone plug-pull detecting circuit for mobile phone |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1585030A (en) * | 2003-08-19 | 2005-02-23 | 扬智科技股份有限公司 | Outputting circuit for detecting cable connection on outputting end, related apparatus and method thereof |
| CN201657320U (en) * | 2010-06-12 | 2010-11-24 | 广东欧珀移动通信有限公司 | Earphone plug-pull detecting circuit for mobile phone |
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