CN220043649U - Sound identification circuit and electronic equipment - Google Patents
Sound identification circuit and electronic equipment Download PDFInfo
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- CN220043649U CN220043649U CN202321438886.9U CN202321438886U CN220043649U CN 220043649 U CN220043649 U CN 220043649U CN 202321438886 U CN202321438886 U CN 202321438886U CN 220043649 U CN220043649 U CN 220043649U
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 45
- 238000005070 sampling Methods 0.000 claims abstract description 26
- 230000004044 response Effects 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000005236 sound signal Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 8
- 238000001914 filtration Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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Abstract
The utility model provides a sound identification circuit and electronic equipment, and relates to the technical field of electronic circuits. A sound identification circuit comprising: the system comprises a peripheral interface, a first switch circuit, a second switch circuit and a control unit, wherein the first switch circuit comprises a first switch and a first resistor which are connected in series between a power supply and the ground, a control end of the first switch is connected with the peripheral interface, and a sampling port of the first switch circuit is configured to be connected with an IO interface of a control unit of the sound identification equipment; the sampling port is positioned between the first switch and the first resistor; the switching circuit is conducted in response to the connection of the peripheral interface and the sound equipment, and the sampling port outputs a first voltage; and responding to disconnection of the peripheral interface and the sound equipment, switching off the switching circuit, and outputting a second voltage by the sampling port, wherein the first voltage and the second voltage are different. The method solves the problems that whether the existing method for identifying whether the external sound is connected is limited by an ADC port of the singlechip and an external interference signal can influence an identification result.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a sound identification circuit and electronic equipment.
Background
At present, a camera is externally connected with high-power sound equipment to carry out sound amplification, an external sound interface is connected with the camera interface, so that a sound equipment circuit and the camera circuit form a certain voltage value/current value, and an ADC (analog-to-digital conversion) port of a singlechip is utilized to identify the voltage value/current value. Presetting a voltage value/current value threshold in the singlechip, and comparing the voltage value/current value threshold with the currently identified voltage value/current value. For example, the currently identified voltage value/current value is greater than a preset voltage value/current value threshold, and it is confirmed that the external sound equipment is connected.
However, the existing method for identifying whether the external sound is connected is limited by the ADC port of the singlechip, and if the singlechip does not have the ADC port or the ADC port is occupied by other equipment, the existing identification method cannot be used. In addition, as the impedance of the audio equipment can dynamically change in the use process, and the voltage value/current value formed by the audio equipment and the camera can be influenced by an external interference signal, the voltage value/current value identified by the ADC port of the singlechip is easy to fluctuate, and the comparison result of the voltage value/current value and the preset voltage value/current value threshold value is possibly deviated, so that the problem of identification errors is solved.
Disclosure of Invention
The utility model provides a sound identification circuit and electronic equipment, which are used for solving the problems that whether an external sound is connected or not is limited by an ADC port of a singlechip and an identification result is influenced by an external interference signal.
In a first aspect, the present utility model provides an acoustic identification circuit comprising: the system comprises a peripheral interface, a first switch circuit, a second switch circuit and a control unit, wherein the first switch circuit comprises a first switch and a first resistor which are connected in series between a power supply and the ground, the control end of the first switch is connected with the peripheral interface, and the sampling port of the first switch circuit is configured to be connected with an IO interface of a control unit of sound identification equipment; the sampling port is positioned between the first switch and the first resistor; the switching circuit is conducted in response to the connection of the peripheral interface and the sound equipment, and the sampling port outputs a first voltage; and responding to disconnection of the peripheral interface and the sound equipment, wherein the switch circuit is turned off, the sampling port outputs a second voltage, and the first voltage and the second voltage are different.
In the embodiment of the utility model, the first voltage can be output from the sampling port when the peripheral interface is connected with the sound equipment, and the second voltage can be output from the sampling port when the peripheral interface is disconnected with the sound equipment through the sound equipment identification circuit of the first switch and the first resistor which are connected in series between the power supply and the ground. Since the first voltage and the second voltage are different, whether the sound is connected or not is identified. The scheme does not need to occupy the ADC port of the singlechip, and is not limited by the ADC port of the singlechip. And the first voltage and the second voltage are influenced by the connection state of the peripheral interface and the sound equipment, so that the influence of the external interference signal on the first voltage and the second voltage is smaller, and the influence of the external interference signal on the identification result is reduced.
With reference to the foregoing technical solution provided by the first aspect, in some possible implementation manners, a first end of the first switch is configured to be connected to the power supply through the first resistor, and a second end of the first switch is grounded.
With reference to the foregoing technical solution of the first aspect, in some possible implementation manners, a first end of the first switch is configured to be connected to the power supply, and a second end of the first switch is grounded through the first resistor.
With reference to the foregoing technical solution of the first aspect, in some possible implementation manners, the first switch is a switching device that is turned on by low level control, and the first switching circuit further includes: and the first end of the first switch is connected with the control end of the first switch through the fifth resistor.
With reference to the foregoing technical solution of the first aspect, in some possible implementation manners, the audio identifying circuit further includes: the second switch circuit comprises a second resistor, and a second switch and a third resistor which are connected in series between a power supply and the ground, wherein the first end of the second switch is connected with the control end of the second switch through the second resistor, the control end of the second switch is connected with the peripheral interface, the control port of the second switch is connected with the control end of the first switch, and the control port is positioned between the second switch and the third resistor, wherein the second switch is a switching device which is controlled to be conducted in a low level.
In the embodiment of the utility model, whether the first switch circuit is connected with the sound is controlled by the second switch circuit, so that the sound is isolated from the first switch circuit, the influence of the sound on the first voltage and the second voltage of the output end of the first switch circuit is reduced, and the accuracy of the detection result is further improved.
With reference to the foregoing technical solution of the first aspect, in some possible implementation manners, the audio identifying circuit further includes: and the control port of the second switch circuit is connected with the control end of the first switch through the fourth resistor.
In the embodiment of the utility model, the current value output by the control port of the second switching circuit can be reduced through the fourth resistor, so that the condition that the first switching circuit is damaged due to overlarge current output by the control port of the second switching circuit is reduced.
With reference to the foregoing technical solution of the first aspect, in some possible implementation manners, a first end of the second switch is configured to be connected to the power supply through the third resistor, and a second end of the second switch is grounded.
With reference to the foregoing technical solution of the first aspect, in some possible implementation manners, a first end of the second switch is configured to be connected to the power supply, and a second end of the second switch is grounded through the third resistor.
With reference to the foregoing technical solution of the first aspect, in some possible implementation manners, the acoustic identification circuit further includes: the first end of the filter circuit is connected with the peripheral interface, the second end of the filter circuit is connected with the control end of the first switch, and the third end of the filter circuit is grounded.
In the embodiment of the utility model, the influence of the signal at the peripheral interface on the first switch circuit is reduced by the filter circuit, so that the accuracy of the finally obtained detection result is improved.
With reference to the foregoing technical solution provided by the first aspect, in some possible implementation manners, the filtering circuit includes: the control end of the first switch is connected with the peripheral interface through the filter resistor; the control end of the first switch is grounded through the second filter capacitor.
With reference to the foregoing technical solution provided by the first aspect, in some possible implementation manners, the peripheral interface is further configured to connect with an audio signal output interface of the control unit, and the sound identification circuit further includes: the peripheral interface is configured to be connected with an audio output port of the control unit through the first filter capacitor.
In a second aspect, the present utility model provides an electronic device comprising: a control unit and the above-described first aspect and/or the acoustic identification circuit described in connection with any one of the embodiments of the above-described first aspect; wherein the sound identification circuit is connected to the control unit, the control unit being configured to transmit an audio signal to the sound through the sound identification circuit upon receiving an acquisition signal indicative of a sound connection sent by the sound identification circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a sound identification circuit according to an embodiment of the present utility model;
FIG. 2 is a circuit diagram of a first switching circuit according to an embodiment of the present utility model;
FIG. 3 is a circuit diagram of a second first switching circuit according to an embodiment of the present utility model;
fig. 4 is a circuit configuration diagram of a third first switch circuit according to an embodiment of the present utility model;
fig. 5 is a circuit configuration diagram of a first switch circuit and a second switch circuit according to an embodiment of the present utility model;
fig. 6 is a circuit configuration diagram of a sound recognition circuit according to an embodiment of the present utility model;
fig. 7 is a block diagram of an electronic device according to an embodiment of the present utility model.
Detailed Description
The terms "first," "second," "third," and the like are used merely for distinguishing between descriptions and not for indicating a sequence number, nor are they to be construed as indicating or implying relative importance.
The technical scheme of the present utility model will be described in detail with reference to the accompanying drawings.
In view of the fact that the existing method for identifying whether an external sound is connected is limited by an ADC port of a single-chip microcomputer and is easily affected by an external interference signal, the problem of identification errors occurs. The utility model provides a sound identification circuit which does not occupy an ADC port of a singlechip and can reduce the influence of external interference signals on an identification result.
Referring to fig. 1, the audio identification circuit 100 shown in fig. 1 includes: a peripheral interface 110, a first switching circuit 120.
The first switch circuit 120 comprises a first switch and a first resistor connected in series between a power supply and the ground, a control end of the first switch is connected with the peripheral interface 110, and a sampling port of the first switch circuit 120 is configured to be connected with an IO interface of a control unit of the sound identification device; the sampling port is located between the first switch and the first resistor.
Wherein, in response to the peripheral interface 110 being connected to the audio, the switching circuit is turned on and the sampling port outputs a first voltage; in response to the peripheral interface 110 being disconnected from the audio, the switching circuit is turned off and the sampling port outputs a second voltage, the first voltage being different from the second voltage.
Alternatively, the external interface 110 may be any type of external audio interface, for example, a two-core connector, a vertical pin-mounted two-core connector, a horizontal pin-mounted two-core connector, etc., which is not limited herein.
The first switch circuit 120 may have the following two embodiments.
In a first embodiment, a first end of the first switch is configured to be connected to a power source through a first resistor, and a second end of the first switch is grounded.
The first switch is a high-level conductive device, for example, the first switch may be a transistor with a switching function, such as an NPN transistor, an NMOS transistor, or the like. The first switch includes, but is not limited to, the above-exemplified embodiments.
Optionally, as shown in fig. 2, the first switching circuit 120 is configured such that the collector of the NPN transistor Q1 is connected to the power supply through the first resistor R1, the emitter of the NPN transistor Q1 is grounded, and the base of the NPN transistor Q1 is connected to the external interface 110.
When the peripheral interface 110 is connected to the audio device, the base of the NPN transistor Q1 receives the voltage of the audio device, the NPN transistor Q1 is turned on, and the sampling port A1 of the first switch circuit 120 outputs a low level. When the peripheral interface 110 is disconnected from the audio, the base of the NPN transistor Q1 is empty, the NPN transistor Q1 is turned off, and the sampling port A1 of the first switch circuit 120 outputs a high level.
In a second embodiment, a first terminal of the first switch is configured to be connected to a power source, and a second terminal of the first switch is grounded through a first resistor.
The first switch is a low-level conducting device, for example, the first switch may be a transistor with a switching function, such as a PNP transistor, a PMOS transistor, or the like. The first switch includes, but is not limited to, the above-exemplified embodiments.
Optionally, as shown in fig. 3, the first switch circuit 120 is configured such that the collector of the PNP transistor Q2 is grounded through the first resistor R2, the emitter of the PNP transistor Q2 is connected to the power supply, and the base of the PNP transistor Q2 is connected to the external interface 110.
When the peripheral interface 110 is connected to the audio device, the base of the PNP transistor Q2 receives the voltage of the audio device, the PNP transistor Q2 is turned on, and the sampling port A1 of the first switch circuit 120 outputs a high level. When the peripheral interface 110 is disconnected from the audio, the base of the PNP transistor Q2 is empty, the PNP transistor Q2 is turned off, and the sampling port A1 of the first switch circuit 120 outputs a low level.
Alternatively, in the case where the first switch is a switching device that is turned on by low level control, the first switching circuit 120 may further include a fifth resistor. The first end of the first switch is connected with the control end of the first switch through a fifth resistor.
For easy understanding, taking the first switch as an example of the PNP type triode, as shown in fig. 4, the collector of the PNP type triode Q2 is configured to be grounded through the first resistor R2, the emitter of the PNP type triode Q2 is connected to the power supply, and the emitter of the PNP type triode Q2 is also connected to the base thereof through the fifth resistor R3, and the base of the PNP type triode Q2 is connected to the external interface 110. The examples herein are for ease of understanding only and should not be construed as limiting the utility model.
In order to reduce the influence of the sound on the first voltage and the second voltage at the output of the first switching circuit 120, in one embodiment, the sound identification circuit 100 further includes a second switching circuit.
The second switch circuit comprises a second resistor, a second switch and a third resistor which are connected in series between the power supply and the ground.
The first end of the second switch is connected with the control end of the second switch through a second resistor, the control end of the second switch is connected with the peripheral interface 110, the control port of the second switch is connected with the control end of the first switch, and the control port is located between the second switch and the third resistor, wherein the second switch is a switching device which is turned on under low level control.
The connection between the second switch and the third resistor can be as follows.
In a first embodiment, the first end of the second switch is configured to be connected to a power supply through a third resistor, and the second end of the second switch is grounded.
The second switch is a high-level on device, and may be a transistor with a switching function, such as an NPN transistor, an NMOS transistor, or the like. The second switch includes, but is not limited to, the above-exemplified embodiments.
In a second embodiment, the first terminal of the second switch is configured to be connected to a power source, and the second terminal of the second switch is grounded through a third resistor.
The second switch is a low-level conductive device, and may be a transistor with a switching function, such as a PNP transistor, a PMOS transistor, or the like. The second switch includes, but is not limited to, the above-exemplified embodiments.
For easy understanding, the following description will take the second switch as a PNP transistor and the first switch as an NPN transistor as examples.
As shown in fig. 5, the emitter and the base of the PNP type triode Q3 (second switch) are connected through the second resistor R4, the base of the PNP type triode Q3 is connected to the external interface 110, and the control port A2 of the PNP type triode Q3 is connected to the base of the NPN type triode Q1 (first switch). The collector of the NPN transistor Q1 is configured to be connected to a power supply through the first resistor R1, the emitter of the NPN transistor Q1 is grounded, and the base of the NPN transistor Q1 is connected to the control port A2 of the PNP transistor Q3.
In practical application, when the peripheral interface 110 is connected to the audio, the second resistor R4 and the audio directly form a loop, so that the second resistor R4 divides the power, the base of the PNP transistor Q3 receives a low voltage, and the PNP transistor Q3 is turned on. The control port A2 of the PNP triode Q3 outputs a high level, the base electrode of the NPN triode Q1 receives the high level, and the NPN triode Q1 is conducted. The sampling port A1 of the first switch circuit 120 outputs a low level.
When the peripheral interface 110 is disconnected from the audio, the second resistor R4 and the audio do not form a loop, so that the second resistor R4 does not divide the voltage, so that the base of the PNP transistor Q3 is at a high level (power supply voltage), and the PNP transistor Q3 is turned off. The control port A2 of the PNP triode Q3 outputs a low level, the base electrode of the NPN triode Q1 receives the low level, and the NPN triode Q1 is cut off. The sampling port A1 of the first switch circuit 120 outputs a high level.
The foregoing examples are provided merely for the purpose of explanation and are in no way to be construed as limiting of the present utility model.
In order to improve the safety of the circuit, the acoustic identification circuit 100 may optionally further comprise a fourth resistor. The control port of the second switch circuit is connected with the control end of the first switch through a fourth resistor.
The fourth resistor can reduce the current value output by the control port of the second switching circuit, thereby reducing the damage of the first switching circuit 120 caused by the overlarge current output by the control port of the second switching circuit.
In one embodiment, in order to reduce the influence of the signal at the peripheral interface 110 on the first switching circuit 120, the sound identification circuit 100 further comprises a filtering circuit.
The first end of the filter circuit is connected with the peripheral interface 110, the second end of the filter circuit is connected with the control end of the first switch, and the third end of the filter circuit is grounded.
Alternatively, the filter circuit may be an RC filter circuit, for example, the filter circuit may include a filter resistor and a second filter capacitor.
The control end of the first switch is connected to the peripheral interface 110 through a filter resistor, and the control end of the first switch is grounded through a second filter capacitor.
When the sound identification circuit 100 includes the second switch circuit, the first end of the filter circuit is connected to the peripheral interface 110, the second end of the filter circuit is connected to the control end of the second switch, and the third end of the filter circuit is grounded.
The specific implementation and principle of the filtering circuit are consistent with the foregoing, and will not be repeated here for brevity.
In one embodiment, the peripheral interface 110 is further configured to be connected to an audio signal output interface of the control unit, and accordingly, in order to reduce an influence of the audio signal output by the audio signal output interface on the sound identification circuit 100, the sound identification circuit 100 further includes a first filter capacitor.
The peripheral interface 110 is configured to be connected to an audio output port of the control unit via a first filter capacitor.
In order to facilitate understanding of the above-mentioned sound identification circuit 100, please refer to fig. 5, fig. 5 is a schematic diagram of a specific embodiment of the sound identification circuit 100 according to an embodiment of the present utility model, which should not be construed as limiting the present utility model.
As shown in fig. 6, the acoustic recognition circuit 100 includes a first switch circuit 120, a second switch circuit, a peripheral interface 110, a filter circuit, a first filter capacitor (C1 shown in fig. 6), and a fourth resistor (R6 shown in fig. 6).
Wherein the port A3 shown in fig. 6 is configured to receive an audio signal. The specific implementation and principles of the first switch circuit 120, the second switch circuit, the peripheral interface 110, the filter circuit, the first filter capacitor and the fourth resistor are already described above, and are not described here again for brevity.
Alternatively, the sampling port A1 of the first switch circuit 120 may be connected to the IO port of the control unit, and the control unit may determine whether the sound is connected by identifying the level signal output by the sampling port A1 of the first switch circuit 120.
The control unit may be a control unit of any device, for example, an electronic device having a control unit, such as a computer, a mobile phone, and an image pickup device.
Based on the same technical idea, the present utility model also provides an electronic device, and as shown in fig. 7, the electronic device 10 includes a control unit 200 and an acoustic recognition circuit 100.
Wherein the sound identification circuit 100 is connected to the control unit 200, the control unit 200 being configured to transmit an audio signal to the sound through the sound identification circuit 100 upon receiving an acquisition signal indicative of a sound connection sent by the sound identification circuit 100.
The control unit 200 may be an integrated circuit chip with signal processing capabilities. Alternatively, the control unit 200 may be a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components.
The specific implementation and principles of the audio identification circuit 100 are already described above, and are not repeated here for brevity.
The electronic apparatus 10 described above may be a computer, a mobile phone, a server, an image pickup apparatus, or the like.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (12)
1. A sound identification circuit, comprising:
a peripheral interface;
the first switch circuit comprises a first switch and a first resistor which are connected in series between a power supply and the ground, wherein the control end of the first switch is connected with the peripheral interface, and the sampling port of the first switch circuit is configured to be connected with an IO interface of a control unit of the sound identification equipment; the sampling port is positioned between the first switch and the first resistor;
the switching circuit is conducted in response to the connection of the peripheral interface and the sound equipment, and the sampling port outputs a first voltage; and responding to disconnection of the peripheral interface and the sound equipment, wherein the switch circuit is turned off, the sampling port outputs a second voltage, and the first voltage and the second voltage are different.
2. The sound identification circuit of claim 1, wherein a first end of the first switch is configured to be connected to the power source through the first resistor, and a second end of the first switch is grounded.
3. The sound identification circuit of claim 1, wherein a first end of the first switch is configured to be connected to the power source and a second end of the first switch is grounded through the first resistor.
4. The sound identification circuit of claim 3, wherein the first switch is a low-level controlled on switching device, the first switching circuit further comprising:
and the first end of the first switch is connected with the control end of the first switch through the fifth resistor.
5. The acoustic identification circuit of claim 1, wherein the acoustic identification circuit further comprises:
the second switch circuit comprises a second resistor, a second switch and a third resistor, wherein the second switch and the third resistor are connected in series between a power supply and the ground, the first end of the second switch is connected with the control end of the second switch through the second resistor, the control end of the second switch is connected with the peripheral interface, the control port of the second switch is connected with the control end of the first switch, and the control port is positioned between the second switch and the third resistor, wherein the second switch is a switching device which is controlled to be conducted by low level.
6. The acoustic identification circuit of claim 5 wherein the acoustic identification circuit further comprises:
and the control port of the second switch circuit is connected with the control end of the first switch through the fourth resistor.
7. The sound identification circuit of claim 5, wherein a first end of the second switch is configured to be connected to the power supply through the third resistor, and a second end of the second switch is grounded.
8. The sound identification circuit of claim 5, wherein a first end of the second switch is configured to be connected to the power source, and a second end of the second switch is grounded through the third resistor.
9. The acoustic identification circuit of any of claims 1-4, further comprising:
the first end of the filter circuit is connected with the peripheral interface, the second end of the filter circuit is connected with the control end of the first switch, and the third end of the filter circuit is grounded.
10. The sound identification circuit of claim 9, wherein the filter circuit comprises:
the control end of the first switch is connected with the peripheral interface through the filter resistor;
and the control end of the first switch is grounded through the second filter capacitor.
11. The sound identification circuit of any one of claims 1-10, wherein the peripheral interface is further configured to interface with an audio signal output interface of the control unit, the sound identification circuit further comprising:
the peripheral interface is configured to be connected with an audio output port of the control unit through the first filter capacitor.
12. An electronic device, comprising:
a control unit and a sound identification circuit as claimed in any one of claims 1 to 11;
wherein the sound identification circuit is connected to the control unit, the control unit being configured to transmit an audio signal to the sound through the sound identification circuit upon receiving an acquisition signal indicative of a sound connection sent by the sound identification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321438886.9U CN220043649U (en) | 2023-06-06 | 2023-06-06 | Sound identification circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321438886.9U CN220043649U (en) | 2023-06-06 | 2023-06-06 | Sound identification circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN220043649U true CN220043649U (en) | 2023-11-17 |
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| CN202321438886.9U Active CN220043649U (en) | 2023-06-06 | 2023-06-06 | Sound identification circuit and electronic equipment |
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| CN (1) | CN220043649U (en) |
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