Voice control system based on single-chip microcomputer

Abstract

The utility model discloses a voice control system based on a single-chip microcomputer. The voice control system comprises a main control chip module, a power supply control module, an audio signal processing module and an audio signal output module. The power supply control module is electrically connected with the main control chip module, the audio signal processing module and the audio signal output module respectively; the power supply control module supplies power to the main control chip module, the audio signal processing module and the audio signal output module respectively; the audio signal processing module and the audio signal output module are electrically connected with the main control chip module. The audio signal processing module is used for processing audio signals input by the main control chip module. And the main control chip controls the audio signal output module to output the audio signal processed by the audio signal processing module. According to the utility model, effective processing and stable output of audio signals are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of voice control system technology, and in particular to a voice control system based on a microcontroller. Background Technology

[0002] In many electronic devices, such as walkie-talkies and audio communication equipment, effective control of the microphone audio is required to enable communication with other devices. Traditional voice control systems may suffer from problems such as poor stability and inadequate audio signal control.

[0003] Chinese patent CN105654948A discloses a voice control system based on SPCE061A. The system hardware includes three parts: a microcontroller, extended memory, and a serial communication interface for the voice control system. The microcontroller integrates an ICE emulation circuit interface, FLASH program memory, SRAM data memory, general-purpose I / O ports, timers / counters, interrupt control, CPU clock, analog-to-digital converter (A / D), DAC output, general-purpose asynchronous serial input / output interface, low-voltage monitoring / low-voltage reset, and can perform voice recognition when a voice recognition program is written into the microcontroller.

[0004] However, the above solution completes speech recognition by writing a speech recognition program into the microcontroller, which cannot meet the requirements for processing and stable output of audio signals. In order to solve the above problems, it is urgent to design a microcontroller-based speech control system to achieve effective processing and stable output of input audio signals. Utility Model Content

[0005] This invention proposes a voice control system based on a microcontroller. The system effectively processes the input audio signal through an audio signal processing module, and the main control chip module controls the audio signal output module to output the processed audio signal, thereby achieving effective processing and stable output of the input audio signal.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a voice control system based on a microcontroller, including a main control chip module, a power control module, an audio signal processing module, and an audio signal output module;

[0008] The power control module is electrically connected to the main control chip module, the audio signal processing module, and the audio signal output module, respectively, and the power control module supplies power to the main control chip module, the audio signal processing module, and the audio signal output module.

[0009] The audio signal processing module and the audio signal output module are electrically connected to the main control chip module. The audio signal processing module is used to process the audio signal input to the main control chip module. The main control chip controls the audio signal output module to output the audio signal processed by the audio signal processing module.

[0010] Furthermore, the power control module includes a power control circuit, which includes a power input terminal P1, a π-type filter composed of an inductor L1, a capacitor C1, a capacitor C2, a capacitor C7, and a capacitor C12, and a voltage regulator chip U1. The π-type filter is connected to the input terminal of the voltage regulator chip U1.

[0011] Furthermore, the power control module also includes a filter circuit, which is connected to the power control circuit.

[0012] Furthermore, the audio signal processing module includes an audio signal processing circuit, which includes a microphone input terminal P2, an electronic switch chip U2, an amplifier chip U3A, an amplifier chip U3B, and an RS232 communication terminal P3. The first pin of the microphone input terminal P2 is connected to the second pin of the electronic switch chip U2. The amplifier chips U3A and U3B together form a two-stage audio preamplifier circuit.

[0013] Furthermore, the main control chip module includes a main control chip U5. The fifth and sixth pins of the main control chip U5 are connected to the second and third pins of the RS232 communication terminal P3 in sequence. The ninth pin of the main control chip U5 is connected to the fourth pin of the microphone input terminal P2 and the fourth pin of the electronic switch chip U2, respectively. The fourteenth pin of the main control chip U5 is grounded.

[0014] Furthermore, the audio signal output module includes an audio signal output circuit, which includes a communication chip U4 and an audio signal output terminal P4. The communication chip U4 is connected to the third and second pins of the RS232 communication terminal P3 in sequence via the ninth and tenth pins. The first and second pins of the audio signal output terminal P4 are connected to the eighth and seventh pins of the communication chip U4 in sequence.

[0015] Furthermore, the voltage regulator chip U1 is model number LM1117-5.0.

[0016] Furthermore, the electronic switch chip U2 is model SGM3005; the amplifier circuit chips U3A and U3B are model NE5532.

[0017] Furthermore, the main control chip U5 uses a microcontroller with the model number PIC16F1824.

[0018] Furthermore, the communication chip U4 is model TPT232.

[0019] The beneficial effects of this utility model are as follows:

[0020] This invention effectively processes the input audio signal through an audio signal processing module, and controls the audio signal output module to output the processed audio signal through a main control chip module. When the main control chip U5 detects that the microphone PTT button is pressed, the voice signal simultaneously enters the main control chip U5. After communicating with the communication chip U4, the main control chip U5 sends a message to the RS232 to provide to the computer. At the same time, the microphone audio signal is pre-amplified by a two-stage audio amplification circuit composed of amplifier chips U3A and U3B. Then, the audio is output to the next stage through the audio signal output terminal P4, thus realizing effective processing and stable output of the input audio signal.

[0021] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures pointed out in the description, claims, and drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of a microcontroller-based voice control system according to an embodiment of the present invention is shown.

[0024] Figure 2 The diagram shows a circuit diagram of the power control module in a microcontroller-based voice control system according to an embodiment of the present invention.

[0025] Figure 3 The diagram shows a circuit diagram of the filter circuit in the power control module of a microcontroller-based voice control system according to an embodiment of the present invention.

[0026] Figure 4 The diagram shows a circuit diagram of an audio signal processing module in a microcontroller-based voice control system according to an embodiment of the present invention.

[0027] Figure 5 The circuit diagram of the main control chip module in a microcontroller-based voice control system according to an embodiment of the present invention is shown.

[0028] Figure 6 The diagram shows a circuit diagram of the audio signal output module in a microcontroller-based voice control system according to an embodiment of the present invention.

[0029] In the diagram: 1. Power control module; 2. Main control chip module; 3. Audio signal processing module; 4. Audio signal output module. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. 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; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0032] like Figure 1-6 As shown, this utility model provides a voice control system based on a microcontroller, including a power control module 1, a main control chip module 2, an audio signal processing module 3, and an audio signal output module 4;

[0033] The power control module 1 is electrically connected to the main control chip module 2, the audio signal processing module 3, and the audio signal output module 4 respectively, and the power control module 1 provides power to the main control chip module 2, the audio signal processing module 3, and the audio signal output module 4 respectively.

[0034] The audio signal processing module 3 and the audio signal output module 4 are both electrically connected to the main control chip module 2. The audio signal processing module 3 is used to process the audio signal input to the main control chip module 2. The main control chip module 2 controls the audio signal output module 4 to output the audio signal processed by the audio signal processing module 3.

[0035] Please see Figure 2 , Figure 2 This is a circuit diagram of the power control module. The power control module 1 includes a power control circuit, which includes a power input terminal P1, a diode D1, inductors L1, L2, and L3, polarized capacitors C1, C2, C3, C4, C5, C6, C7, C11, C12, C13, C14, C38, C39, C40, and C41, a power indicator light D2, a voltage regulator chip U1, a resistor R3, and the power indicator light D2.

[0036] Specifically, the first, second, and third pins of the power input terminal P1 are 12V+, 12V-, and 12V-, respectively. The first pin of the power input terminal P1 is connected to the positive terminal of the diode D1, the negative terminal of the diode D1 is connected to the first terminal of the inductor L2, the second terminal of the inductor L2 is connected to the positive terminals of polarized capacitors C11, C38, C2, C14, and C1, as well as one terminal of the inductor L1, and the third terminal of the inductor L2 is grounded. The inductor L2 is a three-terminal filter of model PLB-100-223. Replacing the ordinary Y capacitor in the AC power filter with an AC three-terminal filter can significantly improve the high-frequency performance of the power filter. The inductor L1 is model MWSA0518-470. The other end of the inductor L1 is connected to the positive terminals of capacitors C12, C7, C5, C39, and C3, as well as the VIN pin of the voltage regulator chip U1. The VOUT pin of the voltage regulator chip U1 is connected to the positive terminals of capacitors C40, C6, C13, C4, and C41, as well as the power indicator D2. The negative terminal of the power indicator D2 is connected to one end of the resistor R3. When the device is powered on, the red power indicator light will illuminate, indicating that the device has been successfully powered on. The second and third pins of the power input terminal P1 are connected to the first end of the inductor L3, and the third end of the inductor L3 is grounded. The inductor L3 is of the same model as the inductor L2. The GND pin of the voltage regulator chip U1 is grounded together with the second end of the inductor L2, the polarized capacitors C11, C38, C2, C14, C1, C12, C7, C5, C39, C3, C40, C6, C13, C4, C41, and the other end of the resistor R3. The model of the voltage regulator chip U1 is LM1117-5.0.

[0037] The inductor L1, polarized capacitor C1, capacitor C2, capacitor C7, and capacitor C12 form a π-type filter. The π-type filter is connected to the input terminal of the voltage regulator chip U1. The voltage regulator chip U1 converts the 12V voltage into a stable 5V output, which is then filtered to power other integrated circuits.

[0038] In this embodiment, as Figure 3As shown, the power control module 1 also includes a filter circuit, which is connected to the power control circuit. Specifically, the filter circuit includes two input terminals, 12V and 5V, which are respectively connected to one end of resistor R1 and resistor R2 to achieve voltage conversion. The filter circuit also includes inductors FB1 and FB2, and capacitors C8, C9, C10, and C15. Capacitors C8 and C10 are used to filter out high-frequency noise on the power line, providing a grounding path and reducing power supply noise interference to other circuits. The electrolytic capacitors C9 and C15 are 100uF and are used for low-frequency filtering and smoothing the power supply voltage, which can reduce voltage fluctuations and make the power supply more stable. Inductors FB1 and FB2 act as EMI (electromagnetic interference) filters to reduce high-frequency noise in the circuit. Both inductors FB1 and FB2 have an impedance of 300R, which has a good suppression effect at a frequency of 1MHz. The filter circuit realizes power filtering and voltage conversion, providing a stable output.

[0039] In this embodiment, as Figure 4 As shown, Figure 4 This is a circuit diagram of the audio signal processing module 3. The audio signal processing module 3 includes an audio signal processing circuit, which includes a microphone input terminal P2, an electronic switch chip U2, an amplifier circuit chip U3A, an amplifier circuit chip U3B, a capacitor C16, a polarized capacitor C17, a capacitor C18, a polarized capacitor C19, a capacitor C20, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a polarized capacitor C36, a capacitor C37, a capacitor C42, a capacitor C43, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R23, a resistor R24, a resistor R25, and an RS232 communication terminal P3.

[0040] Specifically, the first, second, third, and fourth pins of the microphone input terminal P2 are MIC, GND, GND, and PTT, respectively; the first, second, and third pins of the RS232 communication terminal P3 are GND, TX, and RX, respectively; the RS232 communication parameters are a baud rate of 9600 bit / s, 8 data bits, and 1 stop bit, enabling the transmission of commands and data, such as sending microphone button status commands. The first pin of the microphone input terminal P2 is connected to the NO1 pin of the electronic switch chip U2, and the second and third pins of the microphone input terminal P2 are grounded together with resistor R16, resistor R17, capacitor C43, the fourth pin of amplifier circuit chip U3A, the third terminal of resistor R8, capacitor C25, capacitor C26, and the second and first pins of the RS232 communication terminal P3.The COM1 pin of electronic switch chip U2 is connected to one end of capacitor C22. The other end of capacitor C22 is connected to one end of resistor R16 and capacitor C23. The other end of capacitor C23 is connected to one end of resistor R17, capacitor C21, and capacitor C24. The other end of capacitor C21 is connected to one end of resistor R23 and capacitor C20. The other end of resistor R23 is grounded. The other end of capacitor C24 is connected to one end of resistor R15. The other end of resistor R15 is connected to resistor R5, capacitor C43, and the third pin of amplifier circuit chip U3A. The other end of resistor R5 is connected to resistor R10. The other end of resistor R10 is connected to the second pin of amplifier chip U3A, one end of resistor R7, and one end of capacitor C42. The other end of resistor R5 is connected to one end of resistor R4, resistor R6, capacitor C17, and capacitor C18. The negative terminal of resistor R6 is grounded together with the other ends of polarized capacitors C17 and C18. The other end of resistor R7 is connected to the first end of resistor R9. The other end of capacitor C42 is connected to the second end of resistor R9. The third end of resistor R9 is connected to the first pin of amplifier chip U3A and resistor R2. One end of resistor R24 ​​is connected to the amplifier chip U3A. The eighth pin of the amplifier chip U3A is connected to the power supply. The fourth pin of the amplifier chip U3A is grounded together with the third terminal of capacitor C22, resistor R16, capacitor C23, resistor R17, capacitor C43, resistor R8, capacitor C25, capacitor C26, and the first and second pins of RS232 communication terminal P3. The other end of resistor R25 is connected to the first terminal of resistor R8. The second terminal of resistor R8 is connected to the fifth pin of amplifier chip U3B. One end of resistor R24 ​​is connected to the amplifier chip U3B. The seventh pin of the resistor is connected to one end of the resistor R26. The other end of the resistor R24 ​​is connected to the sixth pin of the amplifier chip U3B. The other end of the resistor R26 is connected to one end of the polarized capacitor C19. The other end of the polarized capacitor C19 is connected to one end of the resistor R11. The other end of the resistor R11 is connected to the resistors R12 and R13 respectively. The other end of the resistor R13 is connected to one end of the capacitor C25. The other end of the resistor R12 is connected to one end of the resistor R14 and the third pin of the RS232 communication terminal P3 respectively. The other end of the resistor R14 is connected to one end of the capacitor C26.

[0041] Among them, the electronic switch chip U2 is a circuit switch, which is controlled by the main control chip module to select the audio input in order to realize the connection and disconnection of the microphone. The model of the electronic switch chip U2 is SGM3005.

[0042] The amplifier circuit chip U3A and amplifier circuit chip U3B together form a two-stage audio preamplifier circuit, and the amplifier circuit chip U3A and amplifier circuit chip U3B are model NE5532. Specifically, amplifier chip U3B is mainly used for pre-amplification of signals. Resistors R4, R5, and R6 form a bias network to provide appropriate operating voltage for amplifier chip U3B. Amplifier chip U3A, together with resistors R9, R25, R7, capacitors C42 and C43, constitutes a first-stage amplifier circuit. Amplifier chip U3B, along with resistors R9 and R25, is used to control the amplification factor. Amplifier chip U3B, together with resistors R8, R24, R26, and capacitor C19, forms a second-stage amplifier circuit. After the signal is amplified by the first-stage amplifier circuit, it enters the second-stage amplifier circuit for further processing. Resistors R24 and R26 provide a feedback path for fine gain control, and capacitor C19 serves as an output coupling capacitor to isolate DC components. Amplifier chips U3A and U3B together form a two-stage audio amplifier circuit. The audio signal after passing through the two-stage audio amplifier circuit can directly enter the power amplifier or other subsequent circuits.

[0043] In addition, Figure 4 In the circuit diagram, capacitors C22 and C23, resistors R16 and R17 are located in the first box area, and resistors R11, R12, R13, and R14, capacitors C25 and C26 are located in the second box area. The first and second box areas are reserved for debugging, which facilitates the addition of test points, jumpers, or debugging components during the debugging process, and makes it easier to diagnose faults, test performance, and adjust parameters of the circuit.

[0044] In this embodiment, as Figure 5As shown, the main control chip module 2 includes a main control chip U5, which uses a PIC16F1824 microcontroller. Specifically, the first pin of the main control chip U5 is connected to one end of capacitor C31 and inductor FB3, the fourth pin of the main control chip U5 is connected to one end of resistor R20, the other end of resistor R20 is connected to one end of resistor R19 and capacitor C35, the other end of capacitor C35 is grounded, the other end of inductor FB3 is connected to one end of resistor R19 and capacitor C28, the fourteenth pin of the main control chip U5 is grounded together with the other ends of capacitors C28 and C31, and the tenth pin of the main control chip U5... The third pin is connected to the fourth pin of interface J1, the twelfth pin of the main control chip U5 is connected to the sixth pin of interface J1, the ninth pin of the main control chip U5 is connected to the PTT pin of the microphone, the fifth pin of interface J1, and the conversion pin SW connected to the IN1 pin of the electronic switch chip U2, respectively; the fifth and sixth pins of the main control chip U5 are connected to the second and third pins of RS232 communication terminal P3, respectively, for communication with external devices, the ninth pin of the main control chip U5 is connected to the fourth pin of the microphone input terminal P2 and the fourth pin of the electronic switch chip U2, and the fourteenth pin of the main control chip U5 is grounded. When the main control chip U5 detects that the microphone PTT button is pressed, the voice signal simultaneously enters the main control chip U5. After communicating with the communication chip U4, the main control chip U5 sends command messages via RS232 and provides them to external devices, such as computers. At the same time, the microphone audio signal is pre-amplified by an amplifier circuit composed of amplifier chips U3A and U3B. The output audio signal can be directly input to the subsequent power generation stage or other subsequent circuits. In addition, the main control chip U5 controls the selection of audio input through the electronic switch chip U2.

[0045] Specifically, during normal operation, the 5V power supply provides a high level to the MCLR pin of the main control chip U5 through resistors R19 and R20, enabling the main control chip U5 to operate normally. When the reset switch is pressed, the MCLR pin is pulled low to ground, at which point the main control chip U5 performs a reset operation, resetting the internal registers and other states to their initial values. After the reset switch is released, the MCLR pin returns to a high level again through resistors R19 and R20, and the main control chip U5 resumes normal operation. Capacitor C35 plays a role in stabilizing the power supply voltage at the moment of power-on and during the operation of the main control chip U5, preventing sudden changes in the power supply voltage from affecting the normal operation of the main control chip U5.

[0046] In this embodiment, as Figure 6As shown, the audio signal output module 4 includes an audio signal output circuit, which includes a communication chip U4 and an audio signal output terminal P4. The first, second, and third pins of the audio signal output terminal P4 are Audio+, Audio-, and Audio-, respectively. The communication chip U4 is connected to the third and second pins of the RS232 communication terminal P3 via its ninth and tenth pins, respectively. The first and second pins of the audio signal output terminal P4 are connected to the eighth and seventh pins of the communication chip U4, respectively. The eighth pin of the communication chip U4 is connected to the first pin of the terminal P4. Specifically, the sixth pin of communication chip U4 is first connected to one end of capacitor C34. The other end of capacitor C34 is grounded together with one end of inductor FB4. The other end of inductor FB4 is connected to the third pin of audio signal output terminal P4. A resistor R18 is connected between the seventh pin of communication chip U4 and the second pin of audio signal output terminal P4. A resistor R21 is connected between the eighth pin of communication chip U4 and the first pin of audio signal output terminal P4. The sixteenth pin of communication chip U4 is connected to capacitors C29 and C30 respectively. The fifteenth pin of communication chip U4 is grounded together with the other ends of capacitors C29 and C30 respectively.

[0047] The working principle of this utility model:

[0048] When the main control chip U5 detects that the microphone PTT button is pressed, the voice signal enters the main control chip U5 at the same time. After communicating with the communication chip U4, the main control chip U5 sends a message to the RS232 to provide to the computer. At the same time, the microphone audio signal is pre-amplified by a two-stage audio amplifier circuit composed of amplifier circuit chip U3A and amplifier circuit chip U3B. Then the audio is output to the next stage through the audio signal output terminal P4.

[0049] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0050] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A voice control system based on a microcontroller, characterized in that, Includes a main control chip module, a power control module, an audio signal processing module, and an audio signal output module; The power control module is electrically connected to the main control chip module, the audio signal processing module, and the audio signal output module, respectively, and the power control module supplies power to the main control chip module, the audio signal processing module, and the audio signal output module. The audio signal processing module and the audio signal output module are electrically connected to the main control chip module. The audio signal processing module is used to process the audio signal input to the main control chip module. The main control chip controls the audio signal output module to output the audio signal processed by the audio signal processing module.

2. The voice control system based on a microcontroller according to claim 1, characterized in that, The power control module includes a power control circuit, which includes a power input terminal P1, a π-type filter composed of an inductor L1, a capacitor C1, a capacitor C2, a capacitor C7, and a capacitor C12, and a voltage regulator chip U1. The π-type filter is connected to the input terminal of the voltage regulator chip U1.

3. The voice control system based on a microcontroller according to claim 2, characterized in that, The power control module also includes a filter circuit, which is connected to the power control circuit.

4. A voice control system based on a microcontroller according to claim 1, characterized in that, The audio signal processing module includes an audio signal processing circuit, which includes a microphone input terminal P2, an electronic switch chip U2, an amplifier chip U3A, an amplifier chip U3B, and an RS232 communication terminal P3. The first pin of the microphone input terminal P2 is connected to the second pin of the electronic switch chip U2. The amplifier chips U3A and U3B together form a two-stage audio preamplifier circuit.

5. A voice control system based on a microcontroller according to claim 1, characterized in that, The main control chip module includes a main control chip U5. The fifth and sixth pins of the main control chip U5 are connected to the second and third pins of the RS232 communication terminal P3 in sequence. The ninth pin of the main control chip U5 is connected to the fourth pin of the microphone input terminal P2 and the fourth pin of the electronic switch chip U2. The fourteenth pin of the main control chip U5 is grounded.

6. A voice control system based on a microcontroller according to claim 1, characterized in that, The audio signal output module includes an audio signal output circuit, which includes a communication chip U4 and an audio signal output terminal P4. The communication chip U4 is connected to the third and second pins of the RS232 communication terminal P3 in sequence via the ninth and tenth pins. The first and second pins of the audio signal output terminal P4 are connected to the eighth and seventh pins of the communication chip U4 in sequence.

7. A voice control system based on a microcontroller according to claim 2, characterized in that, The voltage regulator chip U1 is model number LM1117-5.

0.

8. A voice control system based on a microcontroller according to claim 4, characterized in that, The electronic switch chip U2 is model SGM3005; the amplifier circuit chips U3A and U3B are model NE5532.

9. A voice control system based on a microcontroller according to claim 5, characterized in that, The main control chip U5 uses a microcontroller with the model number PIC16F1824.

10. A voice control system based on a microcontroller according to claim 6, characterized in that, The communication chip U4 is model TPT232.

Images