JP4310463B2 - Commonly used detection device for video / audio interface outlet and earphone line outlet - Google Patents

Description

  The present invention relates to video / audio outlets for video / audio players, and more particularly to detection devices and methods commonly used for video and audio outlets of portable recorder / players or portable players.

  A typical portable video recorder / player and video / audio output interface of a video player are shown in FIG. This interface comprises a 4-terminal outlet 10 as well as a corresponding circuit structure 20. The outlet 10 includes a ground terminal 11, a video output terminal 12, a first audio output terminal 13, and a second audio output terminal 14, each of which is a ground terminal of the video / audio 4-terminal plug 30 shown in FIG. 31, the video input terminal 32, the first audio input terminal 33, and the second audio input terminal 34 are in contact with each other. The first audio output terminal 13 is connected to the push rod 15. When the plug 30 is inserted and contacts the first audio output terminal 13, the push rod 15 can be pushed at the same time to separate the detection line 16 from the ground line 17. The video signal output terminal 21, the second audio signal output terminal 22, the first audio signal output terminal 23, and the plug detection terminal end 24 of the circuit structure 20 are the video output terminal 12 and the second audio output terminal of the outlet 10, respectively. 14 is in communication with the first audio output terminal 13 and the detection line 16.

  Currently, typical video / audio devices have an earphone 3 terminal outlet and a video 4 terminal outlet, respectively. See FIGS. 2 and 3. In order to reduce the volume of the video / audio device and make it appear smaller, the three-terminal earphone plug 40 and the four-terminal video plug 30 must be inserted into a commonly used four-terminal outlet. The most commonly used method is to change the outlet structure so that it can be determined what type of plug has been inserted when the structure must be commonly used. Otherwise, one plug must have a plurality of output lines. However, if standard earphone plugs with a diameter of 3.5φ or 2.5φ are still used, changing the outlet is not practical. The only way that can be taken is to use a standard insertion hole 4-terminal outlet and also operate in conjunction with the manually operated output mode. For example, video / audio devices having a 4-terminal outlet 10 shown in FIG. 1 for the common output of video output and audio output are already on the market. However, the user must select whether to simultaneously output video signals by using a manual operation method. When the three-terminal earphone outlet 40 is inserted, the user must choose not to output the video signal and shut off the built-in horn device. On the other hand, if the four-terminal video plug 30 is inserted, the user must not only choose to output a stereo sound signal and shut off the built-in horn device, but also to allow the system to output a video signal. Don't be. The operation for switching the output mode described above is a waste of considerable time, which is inconvenient for a user who is not accustomed to switching the output mode. When the plug 40 is inserted, the first audio input terminal 41 and the second audio input terminal 42 of the plug 40 are in contact with the first audio output terminal 13 and the second audio output terminal 14, respectively. However, the ground terminal 43 of the plug 40 is in contact with the ground terminal 11 and the video output terminal 12 of the outlet 10 at the same time. If the video signal output is not stopped, the video signal is continuously transmitted to the video output terminal 12 and further transmitted to the ground terminal 11 as a result. This not only wastes electricity, but can also damage components in the circuit.

  The main object of the present invention is to make the 4-terminal outlet more convenient to use, and to change the impedance of the video output terminal of the 4-terminal outlet while the 4-video terminal and the 3-terminal earphone plug are inserted. Common for video interface outlets and earphone line outlets by determining what kind of plug is inserted and outputting corresponding signals to prevent damage to components in the circuit by detecting It is to provide a detection device and method used in the above.

Thus, the present invention is a detection method commonly used for video interface outlets and earphone line outlets,
(1) A step of allowing detection of whether or not a plug is inserted into the four-terminal outlet with respect to the detection device, continuing detection if not inserted, and proceeding to the next step if inserted. ,
(2) It is possible to detect whether or not the impedance value of the video output terminal of the four-terminal outlet is larger than a preset value for the detection device, and if so, the video signal is output by the detection device. Controlling the output terminal, and controlling the video signal output terminal so that the video signal is not output by the detection device unless the output terminal is large.
The detection device is connected to a plug detection terminal and a video output terminal of the 4-terminal outlet, and when the detection device detects a message indicating that a plug is inserted in the plug detection terminal, It is preferable that the detection device sends a control signal that causes the video signal output terminal to output a video signal or not to output a video signal according to an output impedance value of the video output terminal.
The detection device includes a microprocessor connected to the plug detection terminal of the 4-terminal outlet, a control signal input terminal of the first, second and third switching chips, and a signal output terminal of the transistor, The first and second switching chips are further connected to the transistors via corresponding resistors, respectively, a detection power input terminal is connected to the first switching chip, and the power input terminal is When the first switching chip is open, it communicates with the transistor and the second switching chip via the corresponding resistors, respectively, and the second switching chip is further connected to the video output terminal of the outlet. The microprocessor is connected to the microprocessor by the microprocessor. A signal for opening each of the first switching chip and the second chip via the control signal input terminal when a message indicating that a plug is inserted into the detection terminal is detected. The detection power supply is sent to the transistor and the second switching chip, and the second switching chip sets the level state of the output impedance to the microprocessor with respect to the signal output terminal of the transistor. The feedback depends on the output impedance value of the video output terminal, and then the microprocessor outputs the video signal to the third switching chip or outputs the video signal to the video signal output terminal. Control signal to control the amplifier so as not to That are sent to a third switching chip is suitable.
Preferably, the microprocessor then sends a control signal to the third switch, and on the other hand sends a control signal to close the first and second switching chips.
Furthermore, the detection device of the present invention is a detection device commonly used for a video interface outlet and an earphone line outlet, and is connected to each of a plug detection terminal and a video output terminal of a four-terminal outlet, Thereby, the detection device can determine the type of the inserted plug according to the output impedance value of the video output terminal when detecting the message that the plug is inserted in the plug detection terminal. Consists of.
The detection device includes a microprocessor connected to the plug detection terminal of the four-terminal outlet, a control signal input terminal of the first and second switching chips, and a signal output terminal of a transistor, respectively. And the second switching chip are further connected to the transistors via corresponding resistors, respectively, and a detection power input terminal is connected to the first switching chip, and the second switching chip is further connected to the first switching chip. Connected to the video output terminal of the outlet so that the microprocessor detects the first switching chip and the microprocessor when the microprocessor detects a message that a plug is inserted in the plug detection terminal. Each of the second chips is connected via the control signal input terminal A signal for releasing the signal is sent to each of the transistors and the second switching chip, and the second switching chip is connected to the signal output terminal of the transistor. It is preferable that the level state of the output impedance is fed back to the microprocessor to depend on the output impedance value of the video output terminal when determining the type of the inserted plug.
The microprocessor is further connected to a control signal input terminal of a third switching chip, the third switching chip is further connected to a power source of a video signal amplifier, and the microprocessor is connected to the signal of the transistor. When the microprocessor detects that the output terminal is at a high voltage level or a low voltage level, the microprocessor causes the third switching chip to output a video signal or not to output a video signal. It is preferable that a control signal being controlled is sent to the third switching chip.

A more complete understanding of the present invention can be obtained by reference to the following description and the accompanying drawings.
Please refer to FIG. The detection method according to the present invention, which enables the video / audio interface outlet and the earphone line outlet to be used in common, includes the following steps.
That is, in steps 401 and 402, the detection device can detect whether a three-terminal or four-terminal plug is inserted in the four-terminal outlet, and if the plug is not inserted, the detection is continued. If not, the process proceeds to the next step. In steps 403 and 404, the detection device can detect whether or not the output impedance of the video / audio output terminal of the 4-terminal outlet is larger than a preset value. Goes to step 405 which allows the detection device to control the video signal output terminal to output the video signal, and if the determination is No, the video signal output terminal is controlled not to output the video signal Proceed to step 406 to allow the detection device to .

  See FIGS. 1, 2 and 3. When the four-terminal plug 30 of this video / audio connection line is inserted, the detection device has an input impedance of 75 Ω at the input terminal of the video reception device or the video / audio connection line 35 is connected to the video reception device. If not, insertion of the four-terminal plug 30 can be detected based on whether an infinitely large open circuit impedance exists. Both the video output terminal 12 and the ground terminal 11 are in contact with the ground terminal 43 and communicate with each other so as to reduce the output impedance of the video output terminal 12 when the three-terminal earphone plug 40 is inserted. is doing. On the other hand, insertion of the three-terminal earphone plug 40 causes the video signal output terminal 21 not to output a video signal when the detection device detects a smaller output impedance at the video output terminal 12 (for example, its value is less than 60Ω). Can be detected to control.

  Reference is now made to FIG. The detection device 50 includes a microprocessor 51 (such as Microprocessor ARM7), first and second switching chips 52 and 53, a transistor 54, and corresponding resistors R2, R3, and R4. The microprocessor 51 is connected to the plug detection terminal 24 shown in FIG. 1, the control signal input terminals 55 and 56 of the first and second switching chips 52 and 53, and the signal output terminal 57 of the transistor 54, respectively. Yes. The first and second switching chips 52 and 53 are further connected to the transistor 54 via corresponding resistors R2, R3 and R4, respectively. The detection power input terminal 58 is connected to the first switching chip 52. When the first switching chip 52 is open, the power input terminal 58 is connected to the transistor 54 and the second switching chip 53 via corresponding resistors R2, R3 and R4, respectively. The second switching chip 53 is further connected to the video output terminal 12 of the plug 10. After detecting a message indicating that a plug is inserted into the plug detection terminal 24, the microprocessor 51 generally connects the first and second switching chips 52 and 53 from the control signal input terminals 55 and 56 after 0.3 seconds. The detection power supply is transmitted to the transistor 54 and the second switching chip 53, and the signal output terminal 57 of the transistor 54 feeds back the level state of the output impedance to the microprocessor 51 by the second switching chip 53 and video. A signal for enabling the type of plug inserted according to the output impedance value of the output terminal 12 to be determined is transmitted. Now consider FIGS. 2 and 3. FIG. When the three-terminal earphone plug 40 is inserted, the output impedance is further reduced, thereby reducing the output impedance, and both the video output terminal 12 and the ground terminal 11 are in contact with the ground terminal 43. Since they are in communication with each other, the signal output terminal 57 of the transistor 54 is at a high voltage level. When a four-terminal video / audio plug 30 is inserted, the output impedance will not be low and will not have an infinite open circuit impedance, and the video output terminal 12 and the ground terminal 11 are in communication. Therefore, the output impedance is a high value that causes the signal output terminal 57 of the transistor 54 to be at a low voltage level.

  See FIGS. 5 and 6. The transistor 51 is further connected to the control signal input terminal 61 of the third switching chip 60, and this known third switching chip 60 is further connected to the power supply terminal of the known video signal amplifier 70. .

  When the microprocessor 51 detects whether the signal output terminal 57 of the transistor 54 is at a high voltage level or a low voltage level, the microprocessor 51 sends a video signal output terminal to the third switching chip 60. 21 outputs a control signal to the third switching chip 60 for controlling the amplifier 70 so that the video signal is output from 21 or is not output. On the other hand, the microprocessor 51 closes the first and second switching chips 52 and 53 so as to save electricity, and controls the video signal when the video signal is output from the amplifier 70. Is sent out. The first, second and third switching chips 52, 53 and 60 of the present invention can be switching chips with a serial number UMC2N.

  The present invention automatically detects that a three-terminal earphone plug or a four-terminal video / audio plug is inserted in a four-terminal video / audio outlet, and determines whether to output a video signal. The output terminal can be automatically controlled. Since the user does not need to manually select the output mode of the system, the operation is simpler, convenient and speedy. Further, even if the user forgets to select the proper output mode or cannot select the proper output mode, the components in the circuit of the system are not damaged. According to the present invention, the user does not need to manually operate the output mode, can hold a 4-terminal outlet corresponding to a standard 3-terminal earphone plug, can simplify the operation, and eliminates an erroneous operation. And can prevent damage to parts in the system.

  The detection device according to the invention requires only two switching chips, one transistor, and three corresponding resistors, and very good results even when the structure is simple and the cost is low Can be obtained. The above-described detection devices and methods commonly used for video interface outlets and earphone line outlets are preferred embodiments of the present invention for illustrative purposes only, and are within the scope and limitations of the disclosed invention. It is not intended to prescribe. Any modifications and variations that will be apparent to those skilled in the art are intended to be included within the scope of this invention.

1 is a schematic diagram of a general video / audio output interface. FIG. 1 is a schematic diagram of a typical 4-terminal video / audio plug. FIG. It is the schematic of a common 3 terminal earphone plug. 3 is a flowchart of a detection method according to the present invention. FIG. 2 is a schematic diagram illustrating a connection between a video / audio output interface and a detection device of the present invention. It is the schematic showing the video / audio output control circuit connected to the detection device of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 4 terminal outlet 11 Ground terminal 12 Video output terminal 13 1st audio output terminal 14 2nd audio output terminal 15 Push rod 16 Detection line 17 Ground line 20 Circuit structure 21 Video signal output terminal 22 2nd audio signal output terminal 23 first audio signal output terminal 24 plug detection terminal 30 video / audio 4 terminal plug 31 ground terminal 32 video input terminal 33 first audio input terminal 34 second audio input terminal 35 video / audio connection line 40 3 terminal earphone Plug 41 First audio input terminal 42 Second audio input terminal 43 Ground terminal 50 Detection device 51 Microprocessor 52 First switching chip 53 Second switching chip 54 Transistor 55 Control signal input terminal 5 6 control signal input terminal 57 transistor signal output terminal 58 power supply input terminal for detection 60 third switching chip 61 control signal input terminal 70 video signal amplifier R2 resistor R3 resistor R4 resistor

Claims (3)

A commonly used detection method for video interface outlets and earphone line outlets,
(1) The detection device is connected to the plug detection terminal and the video output terminal of the 4-terminal outlet, and allows the detection device to detect whether or not a plug is inserted in the 4-terminal outlet. If not, continue detection, and if inserted, go to the next step,
(2) It is possible to detect whether or not the impedance value of the video output terminal of the four-terminal outlet is larger than a preset value for the detection device, and if so, the video signal is output by the detection device. Controlling the output terminal, and controlling the video signal output terminal so as not to output the video signal by the detection device unless it is large,
  The detection device includes a microprocessor connected to the plug detection terminal of the four-terminal outlet, a control signal input terminal of the first, second and third switching chips, and a signal output terminal of a transistor, respectively. The first and second switching chips are further connected to the transistor via corresponding resistors, respectively, a detection power input terminal is connected to the first switching chip, and the power input terminal is connected to the first switching chip. When one switching chip is open, it communicates with the transistor and the second switching chip via the corresponding resistors, respectively, and the second switching chip is further connected to the video output terminal of the outlet And the microprocessor is connected to the plug by the microprocessor. When a message indicating that a plug is inserted into the output terminal is detected, a signal for opening each of the first switching chip and the second chip via the control signal input terminal is transmitted. The detection power supply is sent to the transistor and the second switching chip, and the second switching chip feeds back the level state of the output impedance to the microprocessor with respect to the signal output terminal of the transistor. And the microprocessor outputs the video signal to the third switching chip or does not output the video signal to the video signal output terminal. Control signal to control the amplifier so as to It is sent to the switching chip, detection method. The method of claim 1, wherein the microprocessor then sends a control signal to the third switch, while sending a control signal that causes the first and second switching chips to close.   A detection device commonly used for video interface outlets and earphone line outlets,
  The detection device includes a microprocessor connected to the plug detection terminal of the 4-terminal outlet, a control signal input terminal of the first and second switching chips, and a signal output terminal of a transistor, respectively. 2 switching chips are further connected to the transistors via corresponding resistors, respectively, a detection power input terminal is connected to the first switching chip, and the second switching chip is further connected to the outlet. Connected to the video output terminal of the first switching chip and the second switching chip when the microprocessor detects a message indicating that a plug is inserted in the plug detection terminal. Each of the chips through the control signal input terminal A signal for releasing the signal, and the power supply for detection is sent to the transistor and the second switching chip so that the second switching chip has the output impedance with respect to the signal output terminal of the transistor. When the type of the inserted plug is determined by feeding back the level state of the video signal to the microprocessor, it depends on the output impedance value of the video output terminal, and is inserted according to the output impedance value of the video output terminal. To identify the type of plug
  The microprocessor is further connected to a control signal input terminal of a third switching chip, the third switching chip is further connected to a power source of a video signal amplifier, and the microprocessor is connected to a signal output terminal of the transistor. The microprocessor controls the amplifier to output a video signal or not to output a video signal to the third switching chip when it detects that is at a high voltage level or a low voltage level. Detecting device which sends out a control signal to the third switching chip.

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