Camera external sound post detection circuit and electronic equipment

Abstract

The utility model provides a camera external sound post detection circuit and an electronic device wherein the camera external sound post detection circuit comprises an interface, a control unit, a voltage dividing unit and a switch unit. A socket of the interface is connected with an audio signal output end of the control unit; plugs of the interfaces are connected with sound posts; the voltage dividing unit is used for dividing the voltage output by the direct-current power supply and then outputting the voltage to the detection end; the control unit is used for judging whether the sound post is connected with the audio signal output end through the interface; and the control unit is also used for enabling the switch unit to turn off a path between the voltage dividing unit and the audio signal output end when the sound post is connected with the audio signal output end through the interface. According to the utility model, whether the sound post is connected with the audio signal output end through the interface is judged by detecting the terminal voltage, and when the sound post is connected with the audio signal output end through the interface, the path between the voltage dividing unit and the audio signal output end is switched off; therefore, whether the sound post is connected or not is detected, and interference to the audio signal is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of camera external device detection, in particular to a camera external sound column detection circuit and electronic equipment. Background Art

[0002] The camera device does not have a built-in speaker, or the sound quality of the built-in speaker does not meet the requirements. The camera device usually uses an external device sound column to produce sound.

[0003] However, in many scenarios, the camera cannot detect the plugging and unplugging of an external sound column. For example, when a sound column is plugged in, the camera cannot identify whether the sound column is connected, or when the sound column is not connected, the camera cannot identify whether the sound column is not connected. Utility Model Content

[0004] The main purpose of the utility model is to provide a camera external sound column detection circuit, which is intended to detect whether an external sound column is connected to a camera device.

[0005] To achieve the above-mentioned purpose, the present invention proposes a camera external sound column detection circuit, which includes: an interface, a control unit, a voltage dividing unit and a switch unit;

[0006] The socket of the interface is connected to the audio signal output end of the control unit; the plug of the interface is used to connect to the sound column;

[0007] The switch unit is provided in a circuit between the voltage dividing unit and the audio signal output terminal, and a controlled terminal thereof is connected to a first terminal of the control unit;

[0008] The first end of the voltage dividing unit is connected to the switch unit, the second end is connected to the DC power supply, and the third end is connected to the detection end of the control unit, and is used to divide the voltage output by the DC power supply and output it to the detection end;

[0009] The control unit is configured to determine whether the sound column is connected to the audio signal output terminal through the interface based on the voltage value output by the voltage divider unit to the detection terminal when the switch unit is turned on;

[0010] The control unit is further configured to output a shutoff signal to the controlled end of the switch unit when the sound column is connected to the audio signal output end through the interface, so that the switch unit shuts off the path between the voltage divider unit and the audio signal output end.

[0011] Optionally, the interface is an RCA interface; a first end of the RCA interface plug is connected to the sound column, and a second end is grounded; a resistor is provided between the first end and the second end.

[0012] Optionally, the camera external sound column detection circuit further includes:

[0013] A filter capacitor, wherein a first end of the filter capacitor is connected to the audio signal output end, and a second end of the filter capacitor is connected to the first end of the switch unit and the socket of the interface.

[0014] Optionally, the voltage dividing unit includes:

[0015] a first voltage-dividing resistor, wherein a first end of the first voltage-dividing resistor is connected to the switch unit, and a second end of the first voltage-dividing resistor is connected to the detection end of the control unit;

[0016] a second voltage-dividing resistor, wherein a first end of the second voltage-dividing resistor is connected to the detection end, and a second end of the second voltage-dividing resistor is connected to the DC power supply.

[0017] Optionally, the voltage dividing unit further includes:

[0018] A voltage-stabilizing capacitor, wherein a first end of the voltage-stabilizing capacitor is connected to the detection end, and a second end is grounded.

[0019] Optionally, the camera external sound column detection circuit further includes:

[0020] A transient diode has a first end connected to the socket and a second end grounded.

[0021] Optionally, the switch unit includes:

[0022] A switch device, wherein a first end of the switch device is connected to the audio signal output end and the socket of the interface, a second end is connected to the voltage dividing unit, and a controlled end is connected to the control unit.

[0023] Optionally, the switching device is a triode, a MOS tube or an IGBT tube.

[0024] The utility model also provides an electronic device, which includes a camera device and the camera external sound column detection circuit.

[0025] Optionally, the electronic device is a computer or a television.

[0026] The utility model provides a camera external sound column detection circuit and an electronic device, wherein the camera external sound column detection circuit includes: an interface, a control unit, a voltage dividing unit and a switch unit; the socket of the interface is connected to the audio signal output end of the control unit; the plug of the interface is used to connect the sound column; the switch unit is arranged in the circuit between the voltage dividing unit and the audio signal output end, and its controlled end is connected to the first end of the control unit; the first end of the voltage dividing unit is connected to the switch unit, the second end is connected to a DC power supply, and the third end is connected to the detection end of the control unit, and is used to divide the voltage output by the DC power supply and output it to the detection end; the control unit is used to, when the switch unit is turned on, determine whether the sound column is connected to the audio signal output end through the interface based on the voltage value output by the voltage dividing unit to the detection end; the control unit is further used to output a shutdown signal to the controlled end of the switch unit when the sound column is connected to the audio signal output end through the interface, so that the switch unit shuts off the path between the voltage dividing unit and the audio signal output end. The utility model determines whether the sound column is connected to the audio signal output end through the interface by detecting the output voltage of the voltage dividing unit that changes according to the connection relationship between the interface socket and the plug, and cuts off the path between the voltage dividing unit and the audio signal output end when the sound column is connected to the audio signal output end through the interface; thereby, it is possible to detect whether the sound column is connected and avoid interference with the audio signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 This is a structural diagram of an embodiment of a camera external sound column detection circuit of the present utility model;

[0029] Figure 2 This is a structural diagram of another embodiment of the camera external sound column detection circuit of the present invention.

[0030] Description of Figure Numbers:

[0031] Label name Label name 10 interface 110 socket 20 control unit 120 plug 30 Voltage divider unit C1 filter capacitors 40 Switch unit C2 Voltage stabilizing capacitor R1 The first voltage divider resistor R2 The second voltage divider resistor

[0032] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0036] In addition, in this utility model, the descriptions of "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0037] The camera device does not have a built-in speaker, or the sound quality of the built-in speaker does not meet the requirements. The camera device usually uses an external device sound column to produce sound.

[0038] However, in many scenarios, the camera cannot detect the plugging and unplugging of an external sound column. For example, when a sound column is plugged in, the camera cannot identify whether the sound column is connected, or when the sound column is not connected, the camera cannot identify whether the sound column is not connected.

[0039] In order to solve the above problems, the utility model proposes a camera external sound column detection circuit, referring to Figure 1, the camera external sound column detection circuit includes: an interface 10, a control unit 20, a voltage dividing unit 30 and a switch unit 40;

[0040] The socket 110 of the interface 10 is connected to the audio signal output end of the control unit 20; the plug 120 of the interface 10 is used to connect to the sound column;

[0041] The switch unit 40 is provided in the circuit between the voltage dividing unit 30 and the audio signal output terminal, and its controlled terminal is connected to the first terminal of the control unit 20;

[0042] The first end of the voltage dividing unit 30 is connected to the switch unit 40, the second end is connected to the DC power supply, and the third end is connected to the detection end of the control unit 20, and is used to divide the voltage output by the DC power supply and output it to the detection end;

[0043] The control unit 20 is configured to determine whether the sound column is connected to the audio signal output terminal through the interface 10 based on the voltage value output by the voltage divider unit to the detection terminal when the switch unit 40 is turned on;

[0044] The control unit 20 is further configured to output a shutoff signal to the controlled end of the switch unit 40 when the sound column is connected to the audio signal output end through the interface 10, so that the switch unit 40 shuts off the path between the voltage divider unit 30 and the audio signal output end.

[0045] It should be noted that the sound column is an external device compared to the camera. The two must be connected using interface 10 so that the camera can send audio signals to the sound column for playback. Currently, after inserting the plug 120 of interface 10 connecting to the sound column into the socket 110 of interface 10, the camera cannot detect whether the sound column is connected to the camera. Therefore, when installing the camera equipment, the installer cannot determine whether the camera and the sound column are successfully connected.

[0046] The socket 110 of the interface 10 is connected to the audio signal output terminal of the control unit 20; the plug 120 of the interface 10 is used to connect to the sound column. It is easy to understand that the camera-connected external sound column detection circuit is part of the electronic device; the control unit 20 can be the main controller of the electronic device or an auxiliary chip. The control unit 20 can include an MCU, an IC, a SOC, or an FPGA. After determining that the sound column is successfully connected to the electronic device, the electronic device outputs an audio signal to the sound column through the audio signal output terminal of the control module, so that the sound column plays the corresponding audio file.

[0047] The switch unit 40 is in a normally closed state in its natural state, that is, the voltage divider unit 30 can connect the audio signal output end and the socket 110 of the interface 10 through the switch unit 40. The first end of the voltage divider unit 30 is connected to the switch unit 40, the second end is connected to the DC power supply, and the third end is connected to the detection end of the control unit 20, and is used to divide the voltage output by the DC power supply and output it to the detection end. It should be understood that the voltage divider unit 30 divides the voltage of the DC power supply and outputs it to the detection end of the control unit 20. Specifically, the voltage divider unit 30 includes a voltage divider unit, and the detection end of the control unit 20 can be connected to any point in the voltage divider unit except the first and last two ends. Refer to Figure 1 If the plug 120 is not connected to the socket 110, the voltage output by the DC power supply is not grounded, and the potential at the detection end of the control unit 20 is high.

[0048] If the plug 120 connected to the sound column is connected to the socket 110, the voltage signal of the DC power supply reaches the grounding point of the sound column through the voltage divider unit 30, the switch unit 40, the socket 110 and the plug 120; the potential at the detection end of the control unit 20 is pulled down to a low level.

[0049] The control unit 20 determines whether the sound column is connected to the electronic device based on the potential at its detection end. Specifically, the control unit 20 is used to determine whether the sound column is connected to the audio signal output end through the interface 10 based on the voltage value output by the voltage divider unit to the detection end when the switch unit 40 is turned on.

[0050] In addition, it should be noted that, since the control unit 20 needs to output an audio signal to the sound column after the sound column is connected to the electronic device, and the audio signal output end is connected to the DC power supply through the switch unit 40 and the voltage divider unit 30; in order to avoid the voltage of the DC power supply affecting the audio signal during the audio signal transmission process; therefore, the control unit 20 is also used to output a shutdown signal to the controlled end of the switch unit 40 when the sound column is connected to the audio signal output end through the interface 10, so that the switch unit 40 shuts off the path between the voltage divider unit 30 and the audio signal output end.

[0051] The interface 10 is not limited in this solution and can be a TYPE-C interface 10, a TYPE-A interface 10, a TYPE-B interface 10 or an RCA interface 10. The DC power supply can be a battery, a dry cell or a linear stabilized power supply.

[0052] The utility model provides a camera external sound column detection circuit, the camera external sound column detection circuit includes: an interface 10, a control unit 20, a voltage divider unit 30 and a switch unit 40; the socket 110 of the interface 10 is connected to the audio signal output end of the control unit 20; the plug 120 of the interface 10 is used to connect the sound column; the switch unit 40 is arranged in the circuit between the voltage divider unit 30 and the audio signal output end, and its controlled end is connected to the first end of the control unit 20; the first end of the voltage divider unit 30 is connected to the switch unit 40, and the second end is connected to a DC The power supply has a third terminal connected to the detection terminal of the control unit 20 and is configured to divide the voltage output by the DC power supply and output the voltage to the detection terminal. The control unit 20 is configured to, when the switch unit 40 is on, determine whether the sound column is connected to the audio signal output terminal via the interface 10 based on the voltage value output by the voltage divider to the detection terminal. The control unit 20 is further configured to output a shutdown signal to the controlled terminal of the switch unit 40 when the sound column is connected to the audio signal output terminal via the interface 10, so that the switch unit 40 shuts off the path between the voltage divider 30 and the audio signal output terminal. The present invention determines whether the sound column is connected to the audio signal output terminal via the interface 10 by detecting the output voltage of the voltage divider that changes according to the connection relationship between the socket 110 and the plug 120 of the interface 10. When the sound column is connected to the audio signal output terminal via the interface 10, the voltage divider 30 shuts off the path between the audio signal output terminal. This achieves both detection of whether the sound column is connected and avoids interference with the audio signal.

[0053] In one embodiment, the interface 10 is an RCA interface; a first end of the RCA interface plug 120 is connected to the sound column, and a second end is grounded; a resistor is provided between the first end and the second end.

[0054] When plug 120 is connected to socket 110, the DC power supply voltage is connected to ground through switch unit 40, voltage divider unit 30, socket 110, plug 120, and the resistor. Because the resistor is connected to ground, the voltage at the detection end of control unit 20 is reduced. Using RCA connector 10 facilitates the transmission of audio signals from control unit 20 to the sound column.

[0055] Since a DC component may exist in an audio signal, when the audio signal containing the DC component is played, the DC component will generate noise, thereby reducing the quality of the played audio.

[0056] Reference Figure 2 In one embodiment, the camera external sound column detection circuit further includes:

[0057] A filter capacitor C1 , wherein a first end of the filter capacitor C1 is connected to the audio signal output end, and a second end of the filter capacitor C1 is connected to a first end of the switch unit 40 and the socket 110 of the interface 10 .

[0058] The filter capacitor C1 can filter out the DC component in the audio signal, ensuring that there is no DC component in the audio signal output to the sound column, thereby improving the quality of the audio played by the sound column. Among them, the filter capacitor C1 can be selected according to the frequency of the audio signal to be played. For example, a 2.2uF capacitor can be selected as the filter capacitor C1. The implementation method of the filter capacitor C1 is not limited to the above method, as long as the resonant frequency of the filter capacitor C1 is greater than the frequency of the audio signal.

[0059] The voltage dividing unit 30 includes:

[0060] a first voltage-dividing resistor R1, wherein a first end of the first voltage-dividing resistor R1 is connected to the switch unit 40, and a second end of the first voltage-dividing resistor R1 is connected to a detection end of the control unit 20;

[0061] A second voltage-dividing resistor R2 , wherein a first end of the second voltage-dividing resistor R2 is connected to the detection end, and a second end of the second voltage-dividing resistor R2 is connected to the DC power supply.

[0062] In one example, the first voltage-dividing resistor R1 is 100KΩ, and the second voltage-dividing resistor R2 is 10KΩ.

[0063] The voltage dividing unit 30 further includes:

[0064] A voltage-stabilizing capacitor C2, wherein a first end of the voltage-stabilizing capacitor C2 is connected to the detection end, and a second end of the voltage-stabilizing capacitor C2 is grounded.

[0065] Considering the potential for DC power supply voltage fluctuations, a voltage-stabilizing capacitor C2 is provided between the detection terminal and ground to prevent the control unit 20 from falsely detecting a low level due to DC power supply voltage fluctuations. The detection terminal can be connected to an ADC detection circuit. This solution detects whether an external sound column is connected by detecting the high and low levels of the ADC detection circuit interface 10. This solution is convenient to use, has a simple circuit structure, is easy to implement, and increases versatility, facilitating widespread application. Furthermore, due to the low cost of resistors, the cost of the entire detection circuit is low, which also reduces the cost of the detection circuit.

[0066] Since the interface 10 is easily affected by static electricity, surge pulses may occur, thereby damaging the peripheral interface 10. In one embodiment, the camera external sound column detection circuit further includes:

[0067] A transient diode, wherein a first end of the transient diode is connected to the socket 110 and a second end is grounded.

[0068] The voltage of the interface 10 can be kept at a preset value by using a transient diode, thereby preventing surge pulses caused by static electricity from damaging the peripheral interface 10 and achieving the effect of preventing static electricity.

[0069] The preset value is determined according to the specific model of the transient diode, and the preset value can be changed by selecting a transient diode of a different model.

[0070] The switch unit 40 includes:

[0071] A switch device, wherein a first end of the switch device is connected to the audio signal output end and the socket 110 of the interface 10 , a second end of the switch device is connected to the voltage dividing unit 30 , and a controlled end of the switch device is connected to the control unit 20 .

[0072] The switching device is a triode, a MOS tube or an IGBT tube.

[0073] The present utility model also proposes an electronic device, which includes a camera device and a camera external sound column detection circuit. The specific structure of the camera external sound column detection circuit refers to the above embodiment. Since the electronic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0074] The electronic device may be a computer, a television, or other device including a camera.

[0075] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by utilizing the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A camera external sound column detection circuit, characterized in that: The camera external sound column detection circuit includes: an interface, a control unit, a voltage dividing unit and a switch unit; The socket of the interface is connected to the audio signal output end of the control unit; the plug of the interface is used to connect to the sound column; The switch unit is provided in a circuit between the voltage dividing unit and the audio signal output terminal, and a controlled terminal thereof is connected to a first terminal of the control unit; The first end of the voltage dividing unit is connected to the switch unit, the second end is connected to the DC power supply, and the third end is connected to the detection end of the control unit, and is used to divide the voltage output by the DC power supply and output it to the detection end; The control unit is configured to determine whether the sound column is connected to the audio signal output terminal through the interface based on the voltage value output by the voltage divider unit to the detection terminal when the switch unit is turned on; The control unit is further configured to output a shutoff signal to the controlled end of the switch unit when the sound column is connected to the audio signal output end through the interface, so that the switch unit shuts off the path between the voltage divider unit and the audio signal output end.

2. The camera external sound column detection circuit according to claim 1, characterized in that: The interface is an RCA interface; the first end of the RCA interface plug is connected to the sound column, and the second end is grounded; a resistor is provided between the first end and the second end.

3. The camera external sound column detection circuit as claimed in claim 2, characterized in that: The camera external sound column detection circuit also includes: A filter capacitor, wherein a first end of the filter capacitor is connected to the audio signal output end, and a second end of the filter capacitor is connected to the first end of the switch unit and the socket of the interface.

4. The camera external sound column detection circuit according to any one of claims 1 to 3, characterized in that: The voltage dividing unit includes: a first voltage-dividing resistor, wherein a first end of the first voltage-dividing resistor is connected to the switch unit, and a second end of the first voltage-dividing resistor is connected to the detection end of the control unit; a second voltage-dividing resistor, wherein a first end of the second voltage-dividing resistor is connected to the detection end, and a second end of the second voltage-dividing resistor is connected to the DC power supply.

5. The camera external sound column detection circuit as claimed in claim 4, characterized in that: The voltage dividing unit further includes: A voltage-stabilizing capacitor, wherein a first end of the voltage-stabilizing capacitor is connected to the detection end, and a second end is grounded.

6. The camera external sound column detection circuit according to claim 5, characterized in that: The camera external sound column detection circuit also includes: A transient diode has a first end connected to the socket and a second end grounded.

7. The camera external sound column detection circuit according to any one of claims 1 to 3, characterized in that: The switch unit includes: A switch device, wherein a first end of the switch device is connected to the audio signal output end and the socket of the interface, a second end is connected to the voltage dividing unit, and a controlled end is connected to the control unit.

8. The camera external sound column detection circuit according to claim 7, characterized in that: The switching device is a triode, a MOS tube or an IGBT tube.

9. An electronic device, characterized in that: The electronic device includes a camera device and a camera external sound column detection circuit according to any one of claims 1 to 8.

10. The electronic device according to claim 9, wherein The electronic device is a computer or a television.

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