Sound acquisition circuit

Abstract

The utility model discloses a sound acquisition circuit, comprising a voltage input end electrically connected with an external power supply and used for supplying power to the whole sound acquisition circuit; the audio acquisition circuit is configured with an audio acquisition function, is electrically connected with the voltage input end and is used for acquiring external environment sound and converting the external environment sound into an audio signal; the audio conversion circuit comprises two triodes electrically connected with the audio acquisition circuit and is used for converting audio signals acquired by the audio acquisition circuit into level signals; and the level signal output end is electrically connected with the audio conversion circuit and is used for outputting the level signal to an external circuit. Through the design, the production cost of an enterprise can be reduced, and the economic benefit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of microphones, in particular to a sound collection circuit. Background Art

[0002] With the continuous development of science and technology, more and more consumer products are entering people's homes, such as smart homes. In smart homes, smart lighting is indispensable. For example, some smart lamps can be controlled through networking or Bluetooth to turn on and off, which greatly brings convenience to people's lives.

[0003] Now there is a kind of sound collection LED light strip on the market. The sound is collected by the sound collection circuit to control the LED light strip, so that it keeps changing and flashing. However, the existing sound collection circuit converts the audio signal into an electrical signal through a sound collection chip. The price of this sound collection chip is relatively high, so it will increase the company's production and manufacturing costs.

[0004] Therefore, people in this field need to solve the above problems urgently. Utility Model Content

[0005] In order to solve the technical defects mentioned in the above background technology, the purpose of the utility model is to provide a sound collection circuit, which can reduce the production cost of the enterprise and improve the economic benefit.

[0006] The utility model adopts the following technical solutions:

[0007] A sound collection circuit, comprising:

[0008] A voltage input terminal, electrically connected to an external power source, for supplying power to the entire sound collection circuit;

[0009] An audio collection circuit, configured with an audio collection function, the audio collection circuit is electrically connected to the voltage input terminal and is used to collect external environmental sound and convert it into an audio signal;

[0010] An audio conversion circuit, the audio conversion circuit comprising two triodes electrically connected to the audio collection circuit, and used for converting the audio signal collected by the audio collection circuit into a level signal;

[0011] The level signal output terminal is electrically connected to the audio conversion circuit and is used to output the level signal to an external circuit.

[0012] Optionally, the audio conversion circuit includes:

[0013] A first capacitor, electrically connected to the output end of the audio acquisition circuit, and used for filtering the audio signal;

[0014] A first triode, whose pin 1 is electrically connected to the output end of the first capacitor and whose pin 2 is grounded, is used to amplify the audio signal and convert it into a level signal;

[0015] A first resistor, electrically connected to pin 3 of the first transistor;

[0016] a second capacitor electrically connected to an output end of the first resistor;

[0017] The second transistor Q9, whose pin 1 is electrically connected to the second capacitor output end, pin 2 is grounded, and pin 3 is electrically connected to the level signal output end, is used to amplify and convert the level signal output by the first transistor and regenerate a corresponding level signal to transmit it to the level signal output end.

[0018] Optionally, the audio acquisition circuit includes:

[0019] A microphone, wherein pin 1 is electrically connected to the voltage input terminal and pin 2 is grounded, and the microphone is used to collect external environmental sound and convert it into an audio signal;

[0020] A second resistor, an input end of which is electrically connected to the voltage input end, and an output end of which is electrically connected to pin 1 of the first transistor;

[0021] The third resistor has an input end electrically connected to the output end of the second resistor, and an output end electrically connected to the input end of the first capacitor.

[0022] Optionally, a filter capacitor is further included, one end of which is electrically connected between the second resistor and the third resistor and is used to filter the input voltage.

[0023] Optionally, it also includes: the filter capacitor includes filter resistors connected in parallel, and the filter circuit is electrically connected to the audio conversion circuit to filter the converted level signal.

[0024] In summary, the beneficial effects of the utility model are:

[0025] By electrically connecting the voltage input terminal to the external power supply circuit, the entire sound collection circuit can be powered. By setting up the audio collection circuit, the external environmental sound can be collected and converted into an audio signal. The audio signal is then converted into a level signal through the transistor in the audio conversion circuit. There is no need to set up an audio conversion chip, and a practical transistor can be used instead. Since the price of the transistor is cheaper than the audio conversion chip, the production cost of the enterprise can be reduced.

[0026] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a circuit diagram of a sound collection circuit according to an embodiment of the utility model.

[0028] Description of reference numerals in the figures:

[0029] 1. Voltage input terminal; 2. Audio acquisition circuit; 3. Audio conversion circuit; 4. Level signal output terminal; 5. Filter circuit; C1, first capacitor; Q1, first transistor; R1, first resistor; C2, second capacitor; Q2, second transistor; MIC, microphone; R2, second resistor; R3, third resistor; C3, filter capacitor; R4, filter resistor. DETAILED DESCRIPTION

[0030] In order to make the content of the utility model more clearly understood, the utility model is further described below based on specific embodiments in combination with the accompanying drawings.

[0031] It should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "inner", "outer" and the like used herein to indicate directions or positional relationships are based on directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. Unless otherwise specified, "plurality" means two or more.

[0032] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood by specific circumstances.

[0033] like Figure 1As shown, an embodiment of the present application provides a sound collection circuit, including a voltage input terminal 1, an audio collection circuit 2, an audio conversion circuit 3 and a level signal output terminal 4; the voltage input terminal 1 is electrically connected to an external power supply, and is used to power the entire sound collection circuit; the audio collection circuit 2 is configured with an audio collection function, and the audio collection circuit 2 is electrically connected to the voltage input terminal 1, and is used to collect external environmental sound and convert it into an audio signal; the audio conversion circuit 3 includes two triodes electrically connected to the audio collection circuit 2, and is used to convert the audio signal collected by the audio collection circuit into a level signal; the level signal output terminal 4 is electrically connected to the audio conversion circuit 3, and is used to output the level signal to an external circuit.

[0034] In the embodiment of the present application, the voltage input terminal 1 can be electrically connected to an external 3.3V external power supply, so as to power the entire system. The audio acquisition circuit 2 is provided with an audio acquisition function. Specifically, a microphone MIC is internally configured to collect external environmental sounds, so as to convert external sounds into audio signals. The audio conversion circuit 3 includes two transistors. In the prior art, a model LMV321 / SOT23-5 audio conversion chip is usually used (the market price of this chip is about 0.6 yuan each). Therefore, two NPN transistors are set as a replacement (about 1 cent each). The model is S9014. Therefore, by replacing the audio conversion chip with two transistors, the production cost of the enterprise can be reduced, thereby increasing the revenue of the enterprise.

[0035] Specifically, the converted level signal is outputted through the level signal output terminal 4, so as to provide the external circuit with a level signal that changes according to the change of the audio signal, thereby controlling the external LED light strip to change or flash.

[0036] Further, such as Figure 1 As shown, the audio conversion circuit 3 includes a first capacitor C1, a first transistor Q1, a first resistor R1 and a second capacitor C2. The first capacitor C1 is electrically connected to the output end of the audio acquisition circuit 2 and is used to filter the audio signal; the first transistor Q1 has its pin 1 electrically connected to the output end of the first capacitor C1, and its pin 2 is grounded, and is used to amplify the audio signal and convert it into a level signal; the first resistor R1 is electrically connected to the pin 3 of the first transistor Q1; the second capacitor C2 is electrically connected to the output end of the first resistor R1; the second transistor Q2 has its pin 1 electrically connected to the output end of the second capacitor C2, its pin 2 is grounded, and its pin 3 is electrically connected to the level signal output end 4, and is used to amplify and convert the level signal output by the first transistor Q1 and generate a corresponding level signal again to transmit it to the level signal output end 4.

[0037] In one embodiment of the present application, the input end of the first capacitor C1 is electrically connected to the output end of the third resistor R3, and the output end of the first capacitor C1 is electrically connected to pin 1 of the first transistor Q1. By setting the first capacitor C1, the audio signal collected by the microphone MIC can be filtered, so that it can be more accurate when the transistor amplifies or converts. The model of the first transistor Q1 can be S9014. By setting the first transistor Q1, the audio signal can be preliminarily converted, and then by setting the second transistor Q2, the level signal converted by the first transistor Q1 can be converted again, so that a corresponding and accurate level signal can be obtained, thereby replacing the audio conversion chip, thereby reducing production costs and improving the economic benefits of the enterprise.

[0038] Optional, such as Figure 1 As shown, the audio acquisition circuit 2 includes a microphone MIC, a second resistor and a third resistor R3: pin 1 of the microphone MIC is electrically connected to the voltage input terminal 1, and pin 2 is grounded. The microphone MIC is used to collect external environmental sound and convert it into an audio signal; the input end of the second resistor R2 is electrically connected to the voltage input terminal 1, and the output end is electrically connected to pin 1 of the first transistor Q1; the input end of the third resistor R3 is electrically connected to the output end of the second resistor R2, and the output end is electrically connected to the input end of the first capacitor C1.

[0039] In the embodiment of the present application, pin 1 of the microphone MIC is electrically connected to pin 1 of the first transistor Q1, and external ambient sound is collected through the microphone MIC and output from its pin 1, thereby collecting external ambient sound. The second resistor R2 is used to filter the external input power supply voltage, thereby providing a stable voltage for the microphone MIC. The third resistor R3 is electrically connected between the second resistor R2 and the first capacitor C1. Setting the third resistor R3 can limit the current, thereby preventing the first transistor Q1 from burning out.

[0040] Optional, such as Figure 1 As shown, the embodiment of the present application also includes a filter capacitor C3, one end of which is electrically connected between the second resistor R2 and the third resistor R3, and is used to filter the input voltage.

[0041] In the embodiment of the present application, one end of the above-mentioned filter capacitor C3 is electrically connected to the output end of the second resistor R2, so that the voltage input end 13.3V can be filtered again, thereby preventing the power supply voltage from interfering with the conversion quality of the audio signal by the first transistor Q1.

[0042] Optional, such as Figure 1As shown, the filter capacitor C3 includes filter resistors R4 connected in parallel, and also includes a filter circuit 5, which is electrically connected to the audio conversion circuit 3 and is used to filter the converted level signal.

[0043] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sound collection circuit, characterized in that: include: A voltage input terminal, electrically connected to an external power source, for supplying power to the entire sound collection circuit; An audio collection circuit, configured with an audio collection function, the audio collection circuit is electrically connected to the voltage input terminal and is used to collect external environmental sound and convert it into an audio signal; An audio conversion circuit, the audio conversion circuit comprising two triodes electrically connected to the audio collection circuit, and used for converting the audio signal collected by the audio collection circuit into a level signal; The level signal output terminal is electrically connected to the audio conversion circuit and is used to output the level signal to an external circuit.

2. A sound collection circuit according to claim 1, characterized in that: The audio conversion circuit comprises: A first capacitor, electrically connected to the output end of the audio acquisition circuit, and used for filtering the audio signal; A first triode, whose pin 1 is electrically connected to the output end of the first capacitor and whose pin 2 is grounded, is used to amplify the audio signal and convert it into a level signal; A first resistor, electrically connected to pin 3 of the first transistor; a second capacitor electrically connected to an output end of the first resistor; The second transistor, whose pin 1 is electrically connected to the second capacitor output end, pin 2 is grounded, and pin 3 is electrically connected to the level signal output end, is used to amplify and convert the level signal output by the first transistor and generate a corresponding level signal again to transmit it to the level signal output end.

3. A sound collection circuit according to claim 2, characterized in that: The audio acquisition circuit comprises: A microphone, wherein pin 1 is electrically connected to the voltage input terminal and pin 2 is grounded, and the microphone is used to collect external environmental sound and convert it into an audio signal; A second resistor, an input end of which is electrically connected to the voltage input end, and an output end of which is electrically connected to pin 1 of the first transistor; The third resistor has an input end electrically connected to the output end of the second resistor, and an output end electrically connected to the input end of the first capacitor.

4. A sound collection circuit according to claim 3, characterized in that: It also includes a filter capacitor, one end of which is electrically connected between the second resistor and the third resistor and is used to filter the input voltage.

5. A sound collection circuit according to claim 4, characterized in that: Also includes: The filter circuit, the filter capacitor includes filter resistors connected in parallel, and the filter circuit is electrically connected to the audio conversion circuit to filter the converted level signal.

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