CN100372188C - Simplification and simplifying device for detecting audio-visual signal wire and earphone signal wire - Google Patents
Simplification and simplifying device for detecting audio-visual signal wire and earphone signal wire Download PDFInfo
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- CN100372188C CN100372188C CNB2004100597841A CN200410059784A CN100372188C CN 100372188 C CN100372188 C CN 100372188C CN B2004100597841 A CNB2004100597841 A CN B2004100597841A CN 200410059784 A CN200410059784 A CN 200410059784A CN 100372188 C CN100372188 C CN 100372188C
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Abstract
The present invention relates to a device and a method for simplifying a method of detecting a video-audio signal line and an earphone signal line, which enables a detection device to detect whether a plug with three or four ports is inserted in a socket or not; if the plug with three or four ports is not inserted in the plug, the detection is continued; or else, the high-low state of an impedance value of the image output end of the socket is detected; if the value is high, the image signal output end is controlled to output an image signal; if the value is low, the image signal output end is controlled not to output an image signal but only output a sound signal. The present invention which has the advantages of simple structure and low cost can have a stable detection effect.
Description
Technical field
The present invention is the audio-visual accessory power outlet of relevant video-audio playing device, the shared checkout gear and the method for audio-visual accessory power outlet of especially relevant portable Video Recorder, portable projector.
Background technology
The audio-visual output interface of general portable Video Recorder, projector as shown in Figure 1.Comprise one or four end sockets 10 and the circuit structure 20 that matches.This socket 10 comprises earth terminal 11, image signal output end 12, the first sound channel output 13, the second sound channel output 14, to contact earth terminal 31, image input 32, the first sound channel input 33, the second sound channel input 34 of audio-visual four end plugs 30 as shown in Figure 2 respectively.The first sound channel output 13 connects a push rod 15, when plug 30 insertions touch the first sound channel output 13, can promote push rod 15 simultaneously, and detection lead 16 is separated with earth connection 17.Image signal output end 21, the second sound channel signal output part 22, the first sound channel signal output 23 and the plug test side 24 of circuit structure 20, image signal output end 12, the second sound channel output 14, the first sound channel output 13 and the detection lead 16 with socket 10 is conducted respectively.
General AV device has other earphone three end sockets and audio-visual four end sockets at present.See also Fig. 2, shown in Figure 3.When the AV device volume more and more hour, just be necessary to make the three end plugs 40 of earphone signal line and four end plugs, 30 shared one or the four end sockets of video-audio signal line, with reduced volume.When necessary shared, method commonly used is to revise socket, makes and can judge on the structure which kind of plug the plug that inserts is.Or make a plug have a plurality of output lines out of the ordinary.If still will use the standard headphone plug of 3.5 φ, 2.5 φ diameters, then revise socket scheme and infeasible, only can utilize four end sockets of standard jacks, be not used the output mode of person's manual operation system again.As having AV device on the market, with four end sockets 10 as shown in Figure 1, as audio-visual output and the shared output of earphone sound.But the user must select whether to want output image signal simultaneously with the manual mode of operation system.When inserting earphone three end plugs 40, the user must select not output image signal, and closes built-in loudspeaker device.Otherwise if when inserting audio-visual four end plugs 30, then the user not merely will select to export the stereo sound signal, close built-in loudspeaker device, the more necessary system's output image signal that makes.The operation of above-mentioned conversion output mode is lost time, and is very inconvenient for the user who is unfamiliar with the conversion output mode.When inserting plug 40, the first sound channel input 41 of plug 40, the second sound channel input 42 contact with the first sound channel output 13, the second sound channel output 14 of socket 10 respectively.But the earth terminal 43 of plug 40 contacts with the earth terminal 11 and the image signal output end 12 of socket 10 simultaneously.If do not stop picture signal when output, will make picture signal continue to transfer to image signal output end 12 and link earth terminal 11, not merely waste electric power, also might damage the part in the circuit.
The applicant once proposed the TaiWan, China patent application respectively No. 92122576, Chinese patent application the 03157938.8th disclose shared checkout gear of a kind of audiovisual interface socket and earphone cord socket and method, address the above problem with the analogous circuit structure.But the analogous circuit structure is comparatively complicated, and unstable, after the inventor gives research again, and proposes the present invention.
Summary of the invention
Main purpose of the present invention, a kind of square law device and method that detects video-audio signal line and earphone signal line of simplifying is being provided, utilization has the checkout gear of A/D translation function, when detecting the insertion of audio-visual four end plugs and earphone three end plugs, the image signal output end of four end sockets has different resistance values, inserts the kind of plug with judgement, and exports relative signal, make the use of four end sockets more convenient, and can not damage the part in the circuit.
Another object of the present invention in that a kind of square law device and method that detects video-audio signal line and earphone signal line of simplifying is provided, has advantage simple in structure, that cost is low, and can reach more stable detection effect.
The present invention makes checkout gear detect four end sockets whether to insert plug, if do not insert plug, then continues to detect; If insert plug, then make checkout gear detect the height state of the resistance value of this four ends socket image signal output end, according to the height state of this resistance value, learn the plug kind of this insertion; Wherein this checkout gear connects the plug test side and the image signal output end of this four ends socket; This checkout gear comprises that one has the microprocessor and a switch wafer of A/D conversion function; After this microprocessor detects the plug test side information that holding wire inserts is arranged, promptly control this switch wafer, make its output export a voltage at this image signal output end, and this voltage of feedback is to the A/D conversion circuit of this microprocessor internal, and knows the height state of the resistance value of this image signal output end.
Other purposes of the present invention, effect and embodiment see also graphic being described in detail as follows.
Description of drawings
Fig. 1 is general audio-visual output interface schematic diagram;
Fig. 2 is general audio-visual four end plug schematic diagrames;
Fig. 3 is general earphone three end plug schematic diagrames;
Fig. 4 is a detection method flow chart of the present invention;
Fig. 5 is the audio-visual output control circuit schematic diagram that is connected with embodiment of the invention checkout gear;
Fig. 6 a, 6b are the circuit diagram that is connected earphone cord or video-audio signal line with the test point of embodiment of the invention checkout gear respectively.
Embodiment
See also shown in Figure 4.The detection method of video-audio signal line of the present invention and earphone signal line comprises the steps:
Step 401,402
Make checkout gear detect four end sockets and whether insert three or four end plugs, then do not continue to detect if insert plug, otherwise enter next step;
Step 403,404
The output impedance that makes checkout gear detect four end socket image signal output ends is high value or low value, makes checkout gear control image signal output end output image signal if high value then enters step 405; If low value then enters step 406 and makes not output image signal of checkout gear control image signal output end.
See also Fig. 1, Fig. 2, shown in Figure 3.Because the input of image receiving device has one 75 ohm input impedance; Or audio-visual connecting line 35 has infinitely-great open-circuit impedance when connection layout is not as receiving device, and when four end plugs 30 of this audio-visual connecting line inserted, checkout gear can detect and learn.If when being inserted as earphone three end plugs 40, image signal output end 12 all contacts with earth terminal 43 with earth terminal 11 and is conducted, and the output impedance of image signal output end 12 is diminished; The output impedance that detects image signal output end 12 when checkout gear diminishes, and as less than 45 ohm the time, what can learn insertion is earphone three end plugs 40, and control image signal output end 21 output image signal not.
See also shown in Figure 5.The checkout gear 50 of the embodiment of the invention comprises that the resistance R 5 of a microprocessor (can be the microprocessor of numbering μ PD784216) 51, switch wafer 52 and coupling forms.Present embodiment is to have the microprocessor 51 of A/D (analog/digital) translation function, the electric binding of difference plug test side 24 and image signal output end 21, the signal input end 53 of switch wafer 52, the signal input end 71 of amplifier 70 and the test point 511 of resistance R 5 one ends shown in Figure 1.The output 55 of the electric binding switch of the other end of resistance R 5 wafer 52.Power input 72 provides amplifier 70 required electric powers.Switch wafer 52 of the present invention can be the switch wafer that is numbered UMC2N.
The execution mode of present embodiment is, after microprocessor 51 detects plug test side 24 information that holding wire inserts is arranged, promptly send the signal input end 53 that controls signal to switch wafer 52, control switch wafer 52 is imported about 0.25 to 0.35 second of electric power via detection source input 54, the voltage that makes input is by output 55, be distributed in the load of electrical installation of resistance R 5 and electric binding image signal output end 21, and by the test point 511 electric A/D change-over circuits that are linked to microprocessor 51 inside of feedback circuit, with the height state of this output impedance of feedback to this microprocessor 51, to learn the plug kind of this insertion.Microprocessor 51 can send between above-mentioned detection period and suppress the signal input end 71 of signal to amplifier 70, rejective amplifier 70 output image signals.
See also shown in Fig. 1,2,3,5,6a, the 6b.When inserting earphone three end plugs 40, because of all contacting with earth terminal 43 with earth terminal 11, image signal output end 12 is conducted, output impedance is diminished, so output impedance is low value, the A/D conversion electrical equipment of microprocessor 51 inside can detect and learn that test point 511 is at electronegative potential (shown in Fig. 6 a); Otherwise when inserting audio-visual four end plugs 30, because of image signal output end 12 and earth terminal 11 not conductings, output impedance is step-down (for example being 75 ohm) not, or has an infinitely-great open-circuit impedance, so output impedance is high value, microprocessor can detect learns that test point 511 is at high potential (shown in Fig. 6 b).
When microprocessor 51 detects test point 511 at high potential or electronegative potential, promptly send the signal input end 71 that control signal starts amplifier 70, control amplifier 70 output image signals or not output image signal to image signal output end 21.The signal input end 53 that microprocessor 51 is sent control signal to switch wafer 52, off switch wafer 52 saving electric power, and prevents from when amplifier 70 output image signals picture signal to be caused interference.
It is earphone three end plugs or audio-visual four end plugs that the present invention can detect what insert audio-visual four end sockets automatically, and control makes whether output image signal of image signal output end automatically.The user does not need via manual selective system output mode, and order more simple, convenient and rapid use.Can not forget or can not select suitable output mode to damage part in the circuit system again because of the user.
The present invention does not need the user with the manual operation output mode, can possess the four end sockets compatible with the earphone three end plugs of standard again, and can simplify the operation, and removes the possibility of operating mistake, avoids the part in the circuit of the system that damages.
Checkout gear of the present invention only needs a switch wafer, a microprocessor and the build-out resistor with A/D translation function, and is simple in structure, cost is low, but can reach more stable detection effect.
The above record only for utilizing the embodiment of the technology of the present invention content, anyly is familiar with modification, the variation that this skill person uses the present invention to do, and all belongs to the claim that the present invention advocates, and is not limited to that embodiment discloses.
In sum, the present invention simplifies the square law device and the method that detect video-audio signal line and earphone signal line and innovates to some extent, and existing audiovisual interface socket and earphone cord socket Shared socket, has effect really and promotes.
Claims (7)
1. the detection method of video-audio signal line and earphone signal line is characterized in that comprising the steps:
Step 1, make checkout gear detect four end sockets whether to insert plug,, then continue to detect if do not insert plug; Otherwise enter next step;
Step 2, make checkout gear detect the height state of the resistance value of this four ends socket image signal output end,, learn the plug kind of this insertion according to the height state of this resistance value;
Wherein this checkout gear connects the plug test side and the image signal output end of this four ends socket; This checkout gear comprises that one has the microprocessor and a switch wafer of A/D conversion function; After this microprocessor detects the plug test side information that holding wire inserts is arranged, promptly control this switch wafer, make its output export a voltage at this image signal output end, and this voltage of feedback is to the A/D conversion circuit of this microprocessor internal, and knows the height state of the resistance value of this image signal output end.
2. the detection method of video-audio signal line as claimed in claim 1 and earphone signal line is characterized in that: this step 2 further comprises: make this checkout gear when if to detect this resistance value be high value, then control this image signal output end output image signal; If when detecting this resistance value and being low value, then control not output image signal of image signal output end, and output sound signal only.
3. the detection method of video-audio signal line as claimed in claim 1 or 2 and earphone signal line is characterized in that: this microprocessor is this plug test side of electric binding and this image signal output end, the signal input end of this switch wafer, the signal input end of an amplifier and the test point of a resistance one end respectively; This switch wafer of the electric binding of the other end of this resistance; When this microprocessor detects test point at high potential or electronegative potential, promptly send the signal input end that control signal starts this amplifier, with control this amplifier output image signal or not output image signal to this image signal output end.
4. the detection method of video-audio signal line as claimed in claim 3 and earphone signal line, it is characterized in that: when this microprocessor sends control signal and starts this amplifier, this microprocessor sends the signal input end that controls signal to this switch wafer, closes this switch wafer.
5. the checkout gear of video-audio signal line and earphone signal line is characterized in that: comprise that a checkout gear connects the plug test side and the image signal output end of four end sockets respectively; When detecting this plug test side the information that plug inserts is arranged,, learn the plug kind of this insertion promptly according to the height state of the output impedance value of this image signal output end with this checkout gear of box lunch; Wherein this checkout gear comprises that one has the microprocessor and a switch wafer of A/D conversion function; After this microprocessor detects the plug test side information that holding wire inserts is arranged, promptly control this switch wafer, make its output export a voltage at this image signal output end, and this voltage of feedback is to the A/D conversion circuit of this microprocessor internal, and knows the height state of the resistance value of this image signal output end.
6. the checkout gear of video-audio signal line as claimed in claim 5 and earphone signal line is characterized in that: this microprocessor is this plug test side of electric binding and this image signal output end, the signal input end of this switch wafer and the test point of a resistance one end respectively; This switch wafer of the electric binding of the other end of this resistance.
7. the checkout gear of video-audio signal line as claimed in claim 6 and earphone signal line is characterized in that: this microprocessor is the signal input end of electric binding one amplifier in addition; Detect test point when high potential or the electronegative potential with this microprocessor of box lunch, promptly send the signal input end that control signal starts this amplifier, with control this amplifier output image signal or not output image signal to this image signal output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100597841A CN100372188C (en) | 2004-06-23 | 2004-06-23 | Simplification and simplifying device for detecting audio-visual signal wire and earphone signal wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100597841A CN100372188C (en) | 2004-06-23 | 2004-06-23 | Simplification and simplifying device for detecting audio-visual signal wire and earphone signal wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1713461A CN1713461A (en) | 2005-12-28 |
| CN100372188C true CN100372188C (en) | 2008-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100597841A Expired - Fee Related CN100372188C (en) | 2004-06-23 | 2004-06-23 | Simplification and simplifying device for detecting audio-visual signal wire and earphone signal wire |
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| Country | Link |
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| CN (1) | CN100372188C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4840060B2 (en) * | 2006-10-03 | 2011-12-21 | ソニー株式会社 | Headphone, noise reduction processing system, and noise reduction processing method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03238991A (en) * | 1990-02-16 | 1991-10-24 | Hitachi Ltd | Video audio signal selection system |
| JPH04133600A (en) * | 1990-09-26 | 1992-05-07 | Sony Corp | Stereo input device for electronic equipment |
| US5118309A (en) * | 1991-04-01 | 1992-06-02 | Motorola, Inc. | Minimum wire interface for multiple accessories |
| US6069960A (en) * | 1996-09-05 | 2000-05-30 | Sony Corporation | Connector device for information-handling apparatus and connector device for stereophonic audio/video apparatus |
| CN1398132A (en) * | 2001-07-12 | 2003-02-19 | 株式会社东芝 | Portable terminal device |
| CN2560126Y (en) * | 2002-08-14 | 2003-07-09 | 连展科技（深圳）有限公司 | Audio frequency electric connector assembly |
-
2004
- 2004-06-23 CN CNB2004100597841A patent/CN100372188C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03238991A (en) * | 1990-02-16 | 1991-10-24 | Hitachi Ltd | Video audio signal selection system |
| JPH04133600A (en) * | 1990-09-26 | 1992-05-07 | Sony Corp | Stereo input device for electronic equipment |
| US5118309A (en) * | 1991-04-01 | 1992-06-02 | Motorola, Inc. | Minimum wire interface for multiple accessories |
| US6069960A (en) * | 1996-09-05 | 2000-05-30 | Sony Corporation | Connector device for information-handling apparatus and connector device for stereophonic audio/video apparatus |
| CN1398132A (en) * | 2001-07-12 | 2003-02-19 | 株式会社东芝 | Portable terminal device |
| CN2560126Y (en) * | 2002-08-14 | 2003-07-09 | 连展科技（深圳）有限公司 | Audio frequency electric connector assembly |
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| Publication number | Publication date |
|---|---|
| CN1713461A (en) | 2005-12-28 |
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