Sound acquisition system
By combining a sound receiving unit, a filtering unit, an amplification circuit, and a Bluetooth chip, the problem of ambient noise interference in the sound acquisition system was solved, and high-quality acquisition of cardiopulmonary sounds and speech signals was achieved.
Patent Information
- Application Number
- CN202422101019.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-08-28
AI Technical Summary
Current sound acquisition systems capture environmental sounds in addition to speech and heart and lung sounds, resulting in low acquisition capabilities.
It employs a combination of a sound receiving unit, a filtering unit, an amplification circuit, and a Bluetooth chip. Through filtering, signal amplification, and analog-to-digital conversion, it filters out ambient noise and improves the acquisition capabilities of heart and lung sounds and speech.
It significantly improves the ability to acquire heart and lung sounds and speech, separating high-quality sound signals, and is suitable for electronic stethoscopes and intelligent auscultation devices.
Smart Images
Figure CN223584332U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to sound collection technical field especially is related to a sound collection system. BACKGROUND
[0002] With the development of electronic technology, digital technology and artificial intelligence technology, electronic stethoscope and intelligent auscultation device have been rapidly developed. Among them, the electronic stethoscope collects the sound signals emitted by the human body through the sound collection system, and then the electronic stethoscope can process the sound signals to separate the heart and lung sound and the voice to further process the heart and lung sound and the voice, such as data storage and disease diagnosis.
[0003] However, the current sound collection system will collect other environmental sounds in addition to the voice and heart and lung sound when collecting sound signals, which will affect the heart and lung sound and voice, and thus the current sound collection system has low collection ability for heart and lung sound and voice. UTILITY MODEL CONTENTS
[0004] Therefore, the utility model provides a sound collection system, which mainly aims at solving the technical problem of low collection ability of the current sound collection system for heart and lung sound and voice.
[0005] To achieve the above purpose, the utility model first provides a sound collection system, which comprises a sound receiving unit, a filter unit, an amplification circuit, and a Bluetooth chip with analog-digital conversion function.
[0006] The sound receiving unit is connected with the filter unit and is used for collecting original sound signals and sending the original sound signals to the filter unit, and the filter unit is used for filtering the original sound signals to obtain sound signals within a preset frequency range.
[0007] The amplification circuit is connected with the filter unit and is used for signal amplification of the sound signals output by the filter unit to obtain the sound signals after signal amplification.
[0008] The Bluetooth chip is connected with the amplification circuit and is used for receiving the sound signals after signal amplification and performing analog-digital conversion processing on the sound signals after signal amplification to obtain target sound signals and wirelessly sending the target sound signals to the upper computer.
[0009] In an embodiment of the utility model, the sound acquisition system further includes a power supply, the sound receiving unit includes a microphone, a bias circuit and a voltage dividing circuit, the input end of bias circuit is connected with the first power output end of power supply, the output end of bias circuit is connected with the positive electrode end of microphone, is used to carry out high frequency interference elimination processing to the voltage that first power output end sent, and is based on high frequency interference elimination processing after voltage power supply for microphone, the negative electrode end of microphone is grounded, the voltage dividing circuit is connected with the positive electrode end of microphone, is used to gather the voltage signal of positive electrode end of microphone, and the voltage signal is as original sound signal, and signal lifting processing is carried out to original sound signal, obtains original sound signal after signal lifting processing, the voltage dividing circuit is connected with filter unit, to send original sound signal after signal lifting processing to filter unit.
[0010] In an embodiment of the utility model, the bias circuit includes a first resistor, a second resistor and a first capacitor, the first end of the first resistor is connected with the first power output end of the power supply, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the positive electrode end of the microphone, the first end of the first capacitor is connected between the first resistor and the second resistor, and the second end of the first capacitor is grounded.
[0011] In an embodiment of the utility model, the voltage dividing circuit includes a third resistor and a fourth resistor, the first end of the third resistor is connected with the second power output end of the power supply, the second end of the third resistor is connected with the second end of the second resistor and the first end of the fourth resistor, and the second end of the fourth resistor is grounded.
[0012] In an embodiment of the utility model, the filter unit is an operational amplifier chip, the amplification circuit includes a second capacitor, a third capacitor, a fifth resistor, a sixth resistor and a variable resistor, the first end of the fifth resistor is connected with the first access pin of the operational amplifier chip, the second end of the fifth resistor is connected with the first end of the second capacitor, the second end of the second capacitor is grounded, the second access pin of the operational amplifier chip is connected with the second end of the third resistor, the first end of the sixth resistor is connected with the first end of the fifth resistor, the second end of the sixth resistor is connected with the first end of the variable resistor, the second end of the variable resistor is connected with the output pin of the operational amplifier chip and the access pin of the Bluetooth chip respectively, the first end of the third capacitor is connected with the first end of the sixth resistor, and the second end of the third capacitor is connected with the second end of the variable resistor.
[0013] In an embodiment of the utility model, the power supply includes power supply battery, first power supply circuit and second power supply circuit, the power supply access end of first power supply circuit is connected with power supply battery, is used to obtain power supply voltage from power supply battery, and carries out voltage step -up processing to power supply voltage, obtains the power supply voltage of first voltage grade, the power supply access end of second power supply circuit is connected with the power output end of first power supply circuit, is used to obtain the power supply voltage of first voltage grade from first power supply circuit, and carries out voltage step -down processing to the power supply voltage of first voltage grade, obtains the power supply voltage of second voltage grade, to power supply bluetooth chip, bias circuit and voltage dividing circuit.
[0014] In an embodiment of the utility model, the first power supply circuit includes first anti-static diode, power switch circuit, inductor, boost chip, seventh resistance, eighth resistance and capacitor filter circuit, the first end of first anti-static diode is connected with the anode of power supply battery and the first access end of power switch circuit respectively, the second end of first anti-static diode is grounded, the first outgoing end of power switch circuit is connected with the first end of inductor, the second end of inductor is connected with the chip power interface of boost chip, the second outgoing end of power switch circuit is connected with the voltage input interface and logic control input interface of boost chip respectively, wherein, power switch circuit is used to control the anode of power supply battery and the inductor and boost chip between the state of conduction or disconnection, the voltage output interface of boost chip is connected with the input end of capacitor filter circuit, the output end of capacitor filter circuit is used to output the power supply voltage of first voltage grade, and capacitor filter circuit is used to filter the voltage output interface output voltage of boost chip, the output end of capacitor filter circuit is also connected with the first end of seventh resistance, the second end of seventh resistance is connected with the voltage feedback input interface of boost chip and the first end of eighth resistance respectively, the second end of eighth resistance is grounded.
[0015] In an embodiment of the utility model, the power switch circuit includes circuit switch, fourth capacitor and fifth capacitor, wherein, the circuit switch includes first access sub terminal, second access sub terminal, first exit sub terminal and second exit sub terminal, the first access sub terminal and the second access sub terminal of circuit switch are connected with the first end of first anti-static diode, the first exit sub terminal of circuit switch is connected with the first end of inductance and the first end of fifth capacitor respectively, the second exit sub terminal of circuit switch is connected with the first end of fourth capacitor, the first end of fifth capacitor, voltage input interface of boost chip and logic control input interface of boost chip respectively, wherein, the circuit switch is used to control the first access sub terminal and the first exit sub terminal of circuit switch to be in conduction state or disconnected state, and control the second access sub terminal and the second exit sub terminal of circuit switch to be in conduction state or disconnected state, the second end of fourth capacitor and fifth capacitor is grounded.
[0016] In an embodiment of the utility model, the capacitor filter circuit includes the sixth capacitor, seventh capacitor, eighth capacitor and ninth capacitor connected in parallel, the sixth capacitor and the seventh capacitor are equal in capacitance value, the eighth capacitor and the ninth capacitor are equal in capacitance value and less than the capacitance value of the sixth capacitor and the seventh capacitor, the first end of the sixth capacitor, the first end of the seventh capacitor, the first end of the eighth capacitor and the first end of the ninth capacitor are connected to the voltage output interface of the boost chip and the first end of the seventh resistor respectively, and the second end of the sixth capacitor, the second end of the seventh capacitor, the second end of the eighth capacitor and the second end of the ninth capacitor are connected to the ground.
[0017] In an embodiment of the utility model, the second power circuit includes second anti-static diode, step-down chip, light emitting diode, ninth resistor, tenth capacitor and eleventh capacitor, the first end of the second anti-static diode is connected with the output end of the capacitor filter circuit, the first end of the tenth capacitor and the voltage input end of the step-down chip respectively, the second end of the second anti-static diode and the second end of the tenth capacitor are grounded, the voltage output end of the step-down chip is connected with the first end of the eleventh capacitor and the anode end of the light emitting diode respectively, and the voltage output end of the step-down chip is used to output the second voltage grade power supply voltage, the second end of the eleventh capacitor is grounded, the cathode end of the light emitting diode is connected with the first end of the ninth resistor, and the second end of the ninth resistor is grounded.
[0018] The sound acquisition system can collect the sound signals emitted by the human body through the sound receiving unit, filter other environmental sounds except the heart-lung sound and the voice through the filtering unit, amplify the sound signals from which the environmental sounds are filtered out through the amplification circuit, and improve the sound signal quality of the collected heart-lung sound and voice. Further, the heart-lung sound signals and the voice signals from which the environmental sounds are filtered out are subjected to analog-digital conversion processing by the Bluetooth chip, target sound signals are obtained, and the target sound signals are sent to the upper computer for further processing by the upper computer. The technical scheme provided by the application can separate the heart-lung sound and the voice corresponding to the sound signals collected by the sound receiving unit, and significantly improve the collection capability of the heart-lung sound and the voice.
[0019] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, can be implemented according to the content of the specification, and in order to let the above and other purposes, characteristics and advantages of the utility model can be more obvious and easy to understand, the following specific embodiment of the utility model is described. BRIEF DESCRIPTION OF DRAWINGS
[0020] The drawings described herein are used to provide a further understanding of the utility model, and constitute a part of the utility model, the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute undue limitation on the utility model. In the drawings:
[0021] Figure 1 The structure schematic view of the sound acquisition system provided by the utility model embodiment is shown;
[0022] Figure 2 The structure schematic view of the Bluetooth chip provided by the utility model embodiment is shown;
[0023] Figure 3 The structure schematic view of another sound acquisition system provided by the utility model embodiment is shown;
[0024] Figure 4 The structure schematic view of the first power supply circuit provided by the utility model embodiment is shown;
[0025] Figure 5 The structure schematic view of the second power supply circuit provided by the utility model embodiment is shown. DETAILED DESCRIPTION
[0026] In the following, the utility model will be described in detail with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.
[0027] For further illustrating the technical means and effects taken by the utility model to achieve the predetermined utility model purposes, the following will combine with the drawings and the preferred embodiments to specifically explain the specific implementation manners, structures, features and effects of the utility model application. In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.
[0028] The following will combine Figures 1 to 5 with the drawings and the preferred embodiments to specifically explain the specific implementation manners, structures, features and effects of the utility model application.
[0029] As Figure 1 shown, one embodiment of the utility model provides a sound acquisition system, the sound acquisition system includes sound receiving unit, filter unit, amplifier circuit and Bluetooth chip with analog-digital conversion and high-speed digital signal processing function. Wherein, the sound receiving unit can be with microphone or microphone, to collect the original sound signal emitted by human body.
[0030] Specifically, the sound receiving unit is connected with the filter unit, is used to collect the original sound signal, and sends the original sound signal to the filter unit, the filter unit is used for filtering the original sound signal, obtains the sound signal in the preset frequency range. Wherein, the frequency range of cardiopulmonary sound and voice is between 20 to 2000 Hz, can set the preset frequency range as 20 to 2000 Hz, and the sound signal outside 20 to 2000 Hz is filtered out through the filter unit, so that other environmental sound can be effectively filtered out, and the quality of the cardiopulmonary sound and voice collected is guaranteed.
[0031] Further, the amplifier circuit is connected with the filter unit, and is used for signal amplification to the sound signal output by the filter unit, to obtain the sound signal after signal amplification. Here, the amplifier circuit can obtain the sound signal from the filter unit and amplify the sound signal, to obtain the sound signal after signal amplification.
[0032] Further, the Bluetooth chip is connected with the amplifier circuit, is used for receiving the sound signal after signal amplification, and carries out analog-digital conversion processing to the sound signal after signal amplification, to obtain target sound signal, and wirelessly sends the target sound signal to the host computer. Here, the target sound signal is the sound signal of cardiopulmonary sound and voice. Here, as Figure 2As shown, the Bluetooth chip uses a transmitting serial port TX and a receiving serial port RX and an amplification circuit and a filtering unit to communicate, obtain the sound signal from the amplification circuit, process the sound signal into a target sound signal, and send the target sound signal to the upper computer through the antenna connected to the Bluetooth chip or the antenna integrated in the Bluetooth chip. Further, the Bluetooth chip can be powered by a 5V voltage, which is sent to the VBAT 4.2V pin of the Bluetooth chip after passing through an anti-static diode and a filtering capacitor. Further, the analog signal collected by the sound collecting unit is connected to the MIC pin.
[0033] It should be noted that the selection and internal circuit connection mode of the sound receiving unit, the filtering unit, the amplification circuit, and the Bluetooth chip can be determined according to the actual situation, and the embodiment is not specifically limited. In addition, the connection mode of each device can be determined according to the specific selection of the device, and the embodiment is not specifically limited. The circuit function of the sound collecting system provided by the embodiment is mainly realized through the circuit connection relationship between each circuit module, and does not depend on the program module in a certain circuit module. In addition, each circuit module in the sound collecting system can be realized through an analog circuit or a digital circuit, and for the circuit module that can implant a program module, the implementation of the module function can be realized through the program module provided by the prior art.
[0034] The sound collecting system provided by the embodiment of the utility model can collect the sound signal emitted by the human body through the sound receiving unit, filter other environmental sounds except the heart-lung sound and the voice through the filtering unit, amplify the sound signal from which the environmental sound is filtered through the amplification circuit, and improve the quality of the heart-lung sound and the voice sound signal collected. Further, the heart-lung sound signal and the voice signal from which the environmental sound is removed are processed by the Bluetooth chip, target sound signals are obtained, and the target sound signals are sent to the upper computer for further processing of the target sound signals by the upper computer. The technical scheme provided by the application can better separate the heart-lung sound and the voice corresponding to the sound signal collected by the sound receiving unit, and significantly improve the collection ability of the heart-lung sound and the voice.
[0035] In one embodiment, the sound collecting system further comprises a power supply for supplying power to each component in the system. Figure 3 As shown, the sound receiving unit comprises a microphone M, a bias circuit and a voltage dividing circuit.
[0036] Specifically, an input end of the bias circuit is connected with a first power output end V1 of a power supply (not shown in the figure), an output end of the bias circuit is connected with a positive electrode end of the microphone M, for carrying out high-frequency interference elimination processing on a voltage emitted by the first power output end V1, and supplying power to the microphone M based on the voltage after high-frequency interference elimination processing, and a negative electrode end of the microphone M is grounded.
[0037] Further, the voltage dividing circuit is connected with the positive electrode end of the microphone M, for collecting a voltage signal of the positive electrode end of the microphone M, taking the voltage signal as the original sound signal, and carrying out signal boosting processing on the original sound signal to obtain the original sound signal after signal boosting processing. Further, the voltage dividing circuit is connected with the filtering unit to send the original sound signal after signal boosting processing to the filtering unit.
[0038] The embodiments provided in the application can eliminate high-frequency interference of the power supply of the microphone, collect a voltage signal of the positive electrode end of the microphone as an original sound signal, and carry out signal boosting processing on the original sound signal, thereby improving the signal quality of the original sound signal and further improving the sound quality of the heart-lung sound and voice separated by the system.
[0039] In one embodiment, as shown in Figure 3 The bias circuit includes a first resistor R1, a second resistor R2 and a first capacitor C1. Here, the first capacitor C1 is a decoupling capacitor, which can have a specification of 0.1uF, the resistances of the first resistor R1 and the second resistor R2 can both be 1K ohms, and the first capacitor C1 and the second resistor R2 can constitute a low-pass filter to eliminate high-frequency interference of the power supply.
[0040] Specifically, a first end of the first resistor R1 is connected with a first power output end V1 of a power supply (not shown in the figure), a second end of the first resistor R1 is connected with a first end of the second resistor R2, and a second end of the second resistor R2 is connected with an output end of the microphone M.
[0041] Further, a first end of the first capacitor C1 is connected between the first resistor R1 and the second resistor R2, and a second end of the first capacitor C1 is grounded.
[0042] The embodiments provided in the application can eliminate high-frequency interference of the power supply received by the microphone based on a simple circuit structure, thereby improving the signal quality of the original sound signal collected by the microphone.
[0043] In one embodiment, as shown in Figure 3As shown, the voltage dividing circuit includes a third resistor R3 and a fourth resistor R4; here, the resistance values of the third resistor R3 and the fourth resistor R4 can both be 1M ohms.
[0044] Specifically, a first end of the third resistor R3 is connected to a second power output end V2 of the power supply (not shown in the figure), a second end of the third resistor R3 is connected to a second end of the second resistor R2 and a first end of the fourth resistor R4, and a second end of the fourth resistor R4 is grounded. Further, a twelfth capacitor C12 can be connected in series between the biasing circuit and the voltage dividing circuit to perform waveform filtering.
[0045] The embodiments provided in the present application can form a voltage dividing network by two 1MΩ third resistors and fourth resistors, perform signal lifting on the original sound signal, and improve the signal quality of the original sound signal of the microphone.
[0046] In one embodiment, as Figure 3 shown, the filtering unit is an operational amplifier chip, the bandwidth gain of the operational amplifier chip can be 20-2K hertz, the frequency range of the sound signal collected by the operational amplifier chip is 20HZ-2kHZ, and the original sound signal is filtered; the amplification circuit includes a second capacitor C2, a third capacitor C3, a fifth resistor R5, a sixth resistor R6, and a variable resistor VR1. Here, the capacitances of the second capacitor C2 and the third capacitor C3 can be 10uF and 100pF respectively, and the resistance values of the fifth resistor R5 and the sixth resistor R6 can be 1k ohms and 22k ohms respectively.
[0047] Specifically, a first end of the fifth resistor R5 is connected to a first access pin IN- of the operational amplifier chip, a second end of the fifth resistor R5 is connected to a first end of the second capacitor C2, and a second end of the second capacitor C2 is grounded. Further, a second access pin IN+ of the operational amplifier chip is connected to a second end of the third resistor R3 to receive the original sound signal.
[0048] Further, a first end of the sixth resistor R6 is connected to a first end of the fifth resistor R5, a second end of the sixth resistor R6 is connected to a first end of the variable resistor VR1, and a second end of the variable resistor VR1 is connected to an output pin OUT of the operational amplifier chip and an access pin of the Bluetooth chip respectively. Specifically, the second end of the variable resistor VR1 can include a first sub-end and a second sub-end, both of which are connected to the output pin OUT of the operational amplifier chip; here, by adjusting the resistance between the second sub-end and the first end of the variable resistor VR1, the resistance value of the variable resistor VR1 is adjusted.
[0049] Further, a first end of the third capacitor C3 is connected with a first end of the sixth resistor R6, and a second end of the third capacitor C3 is connected with a second end of the variable resistor VR1. A second access pin IN+ of the operational amplifier chip is connected with a second end of the third resistor R3, and an output pin OUT of the operational amplifier chip is also connected with the Bluetooth chip. Here, under direct current, the amplification factor of the amplification circuit is: 1+(Ra+Rb) / ∞, wherein Ra is the resistance value of the sixth resistor R6, and Rb is the resistance value of the variable resistor VR1. Under alternating current, the amplification factor of the amplification circuit is: 1+(Ra+Rb) / Rc, wherein Ra is the resistance value of the sixth resistor R6, Rb is the resistance value of the variable resistor VR1, and Rc is the resistance value of the fifth resistor R5. The embodiments provided in the application can amplify the sound signal through the amplification circuit, and improve the signal quality of the cardiopulmonary sound and the voice.
[0050] In one embodiment, the power supply includes a power supply battery, a first power supply circuit, and a second power supply circuit. Here, the power supply battery can be a button cell with an output of 3V voltage.
[0051] Specifically, the power access end of the first power supply circuit is connected with the power supply battery, for obtaining a power supply voltage from the power supply battery, and performing a voltage boosting process on the power supply voltage to obtain a power supply voltage of a first voltage level. The power supply voltage of the first voltage level can be a voltage of 5V.
[0052] Further, the power access end of the second power supply circuit is connected with the power output end of the first power supply circuit, for obtaining the power supply voltage of the first voltage level from the first power supply circuit, and performing a voltage reducing process on the power supply voltage of the first voltage level to obtain a power supply voltage of a second voltage level, to supply power for the Bluetooth chip, the biasing circuit, and the voltage dividing circuit. The power supply voltage of the second voltage level can be a voltage of 3.3V. Specifically, the first power output end of the second power supply circuit is connected with the biasing circuit, for supplying power for the biasing circuit; and the second power output end of the second power supply circuit is connected with the voltage dividing circuit, for supplying power for the voltage dividing circuit.
[0053] The embodiments provided in the application can convert the 3V power supply voltage obtained from the button cell into a 5V voltage based on the first power supply circuit, and convert the 5V voltage into a 3.3V standard voltage required by the Bluetooth chip, the biasing circuit, and the voltage dividing circuit based on the second power supply circuit, to supply power for the Bluetooth chip, the biasing circuit, and the voltage dividing circuit, and improve the power supply stability of the system.
[0054] In one embodiment, as Figure 4As shown, the first power supply circuit includes a first anti-static diode, a power switch circuit, an inductor L, a boost chip, a seventh resistor R7, an eighth resistor R8, and a capacitor filter circuit. Here, the inductance of the inductor L can be 10 micro henry, and the resistance values of the seventh resistor R7 and the eighth resistor R8 can be 523K ohms and 100K ohms, respectively. Among them, the inductor L plays a role of starting, and provides a switching frequency for the boost chip.
[0055] Specifically, the first end of the first anti-static diode is connected with the positive pole of the power supply battery and the first access end of the power switch circuit, respectively, and the second end of the first anti-static diode is grounded.
[0056] Further, the first outgoing end of the power switch circuit is connected with the first end of the inductor L, the second end of the inductor L is connected with the chip power interface LX of the boost chip, and the second outgoing end of the power switch circuit is connected with the voltage input interface VIN and the logic control input interface EN of the boost chip, respectively. Here, the boost chip can be FP6715S6CTR chip. Further, the ground interface GND of the boost chip is grounded. Among them, the power switch circuit is used to control the positive pole of the power supply battery to be in a conductive state or a disconnected state between the inductor L and the boost chip.
[0057] Further, the voltage output interface OUT of the boost chip is connected with the input end of the capacitor filter circuit, the output end of the capacitor filter circuit is used to output the power supply voltage of the first voltage level, and the capacitor filter circuit is used to filter the voltage output by the voltage output interface OUT of the boost chip; further, the output end of the capacitor filter circuit is also connected with the first end of the seventh resistor R7, the second end of the seventh resistor R7 is connected with the voltage feedback input interface FB of the boost chip and the first end of the eighth resistor R8, respectively, and the second end of the eighth resistor R8 is grounded.
[0058] Here, the resistance values of the seventh resistor R7 and the eighth resistor R8 can be adjusted to change the voltage value output by the voltage output interface OUT of the boost chip. Specifically, the calculation formula of the voltage value output by the voltage output interface OUT can be shown as formula 1:
[0059] Vout=(Rd / Re+1)*0.8 (1)
[0060] Among them, Vout is the voltage value output by the voltage output interface OUT, Rd is the resistance value of the seventh resistor R7, and Re is the resistance value of the eighth resistor R8.
[0061] Further, the first end of the first anti-static diode can be connected with a power supply pin J1, and a power consumption unit requiring 5V voltage in the system can be connected to the power supply pin J1 to obtain power. The embodiments provided in the application can convert 3V voltage provided by the button cell into 5V voltage based on the first power supply circuit, and can supply power to the power consumption unit requiring 5V power supply in the system based on the 5V voltage.
[0062] In one embodiment, as shown in Figure 4 The power supply switch circuit includes a circuit switch, a fourth capacitor C4 and a fifth capacitor C5, wherein the circuit switch includes a first access sub-terminal I1, a second access sub-terminal I2, a first output sub-terminal O1 and a second output sub-terminal O2.
[0063] Specifically, the first access sub-terminal I1 and the second access sub-terminal I2 of the circuit switch are connected with the first end of the first anti-static diode, the first output sub-terminal O1 of the circuit switch is connected with the first end of the inductor L and the first end of the fifth capacitor C5 respectively, and the second output sub-terminal O2 of the circuit switch is connected with the first end of the fourth capacitor C4, the first end of the fifth capacitor C5, the voltage input interface VIN of the boost chip and the logic control input interface EN of the boost chip respectively; further, the second ends of the fourth capacitor C4 and the fifth capacitor C5 are grounded. Here, the fourth capacitor C4 and the fifth capacitor C5 serve as filter capacitors to filter voltage.
[0064] The circuit switch is used to control the first access sub-terminal I1 of the circuit switch and the first output sub-terminal O1 of the circuit switch to be in a conductive state or a disconnected state, and control the second access sub-terminal I2 of the circuit switch and the second output sub-terminal O2 of the circuit switch to be in a conductive state or a disconnected state. Here, when it is needed to make the first power supply circuit generate 5V voltage, the first access sub-terminal I1 of the circuit switch and the first output sub-terminal O1 of the circuit switch are connected, and the second access sub-terminal I2 of the circuit switch and the second output sub-terminal O2 of the circuit switch are connected; on the contrary, when it is needed to make the first power supply circuit stop generating 5V voltage, the first access sub-terminal I1 of the circuit switch and the first output sub-terminal O1 of the circuit switch are disconnected, and the second access sub-terminal I2 of the circuit switch and the second output sub-terminal O2 of the circuit switch are disconnected.
[0065] The embodiments provided in the application can control whether the first power supply circuit generates voltage of the first power supply level by controlling the conduction and disconnection of the circuit switch, and filter the voltage input into the boost chip through the filter capacitor, thereby ensuring the power supply quality of the first power supply circuit.
[0066] In one embodiment, as shown in Figure 4As shown, the capacitor filter circuit comprises a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8 and a ninth capacitor C9 connected in parallel; here, the sixth capacitor C6 and the seventh capacitor C7 have equal capacitance values, the eighth capacitor C8 and the ninth capacitor C9 have equal capacitance values which are smaller than the capacitance values of the sixth capacitor C6 and the seventh capacitor C7, the sixth capacitor C6 and the seventh capacitor C7 can be 104 farad capacitors, and the eighth capacitor C8 and the ninth capacitor C9 can be 22 micro-farad capacitors.
[0067] Specifically, the first ends of the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8 and the ninth capacitor C9 are connected to the voltage output interface OUT of the boost chip and the first end of the seventh resistor R7, and the second ends of the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8 and the ninth capacitor C9 are connected together and grounded.
[0068] In an embodiment of the utility model, as shown in the figure, Figure 5 The second power supply circuit comprises a second anti-static diode, a step-down chip, a light-emitting diode, a ninth resistor R9, a tenth capacitor C10 and an eleventh capacitor C11. Here, the resistance value of the ninth resistor R9 can be 680 ohms, and the tenth capacitor C10 and the eleventh capacitor C11 can be 105 farad capacitors.
[0069] Specifically, the first ends of the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8 and the ninth capacitor C9 are connected to the voltage output interface OUT of the boost chip and the first end of the seventh resistor R7, and the second ends of the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8 and the ninth capacitor C9 are connected together and grounded.
[0070] Further, the voltage output end VOUT of the step-down chip is connected to the first end of the eleventh capacitor C11 and the anode end of the light-emitting diode, and the voltage output end VOUT of the step-down chip is used to output the power supply voltage of the second voltage level; further, the ground end ADJ / GND of the step-down chip is grounded. Here, when the second power supply circuit is in a working state and outputs a 3.3V voltage, the light-emitting diode is turned on and emits light to serve as a prompt light, indicating that the second power supply circuit is in a working state.
[0071] Further, the second end of the eleventh capacitor is grounded, the cathode end of the light emitting diode is connected with the first end of the ninth resistor R9, and the second end of the ninth resistor R9 is grounded.
[0072] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.
Claims
1. A sound acquisition system, characterized in that, The sound acquisition system includes a sound receiving unit, a filtering unit, a power supply, an amplification circuit, and a Bluetooth chip with analog-to-digital conversion function. The sound receiving unit includes a microphone, a bias circuit, and a voltage divider circuit. The input terminal of the bias circuit is connected to the first power output terminal of the power supply, and the output terminal of the bias circuit is connected to the positive terminal of the microphone. It is used to perform high-frequency interference cancellation processing on the voltage emitted by the first power output terminal and to supply power to the microphone based on the voltage after high-frequency interference cancellation processing. The negative terminal of the microphone is grounded. The voltage divider circuit is connected to the positive terminal of the microphone to acquire the voltage signal at the positive terminal of the microphone, and uses the voltage signal as the original sound signal. The original sound signal is then subjected to signal boosting processing to obtain the original sound signal after signal boosting processing. The voltage divider circuit is connected to the filter unit to send the original sound signal after signal boosting to the filter unit. The filter unit is used to filter the original sound signal to obtain a sound signal within a preset frequency range, wherein the sound signal includes heart and lung sounds and speech. The amplifier circuit is connected to the filter unit and is used to amplify the sound signal output by the filter unit to obtain the amplified sound signal. The Bluetooth chip is connected to the amplifier circuit and is used to receive the amplified sound signal, perform analog-to-digital conversion on the amplified sound signal to obtain the target sound signal, and wirelessly transmit the target sound signal to the host computer. The bias circuit includes a first resistor, a second resistor, and a first capacitor. The first end of the first resistor is connected to the first power output terminal of the power supply, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the positive terminal of the microphone. The first terminal of the first capacitor is connected between the first resistor and the second resistor, and the second terminal of the first capacitor is grounded. The first capacitor is a decoupling capacitor so that the first resistor, the second resistor and the first capacitor form a low-pass filter to eliminate high-frequency interference from the power supply. The voltage divider circuit includes a third resistor and a fourth resistor; The first end of the third resistor is connected to the second power output terminal of the power supply, the second end of the third resistor is connected to the second end of the second resistor and the first end of the fourth resistor, and the second end of the fourth resistor is grounded. The filtering unit is an operational amplifier chip; the amplification circuit includes a second capacitor, a third capacitor, a fifth resistor, a sixth resistor, and a variable resistor; The first end of the fifth resistor is connected to the first access pin of the operational amplifier chip, the second end of the fifth resistor is connected to the first end of the second capacitor, the second end of the second capacitor is grounded, and the second access pin of the operational amplifier chip is connected to the second end of the third resistor. The first end of the sixth resistor is connected to the first end of the fifth resistor, the second end of the sixth resistor is connected to the first end of the variable resistor, and the second end of the variable resistor is connected to the output pin of the operational amplifier chip and the access pin of the Bluetooth chip, respectively. The first terminal of the third capacitor is connected to the first terminal of the sixth resistor, and the second terminal of the third capacitor is connected to the second terminal of the variable resistor.
2. The sound acquisition system according to claim 1, characterized in that, The power supply includes a power battery, a first power circuit, and a second power circuit. The power input terminal of the first power circuit is connected to the power supply battery to obtain a power supply voltage from the power supply battery and to boost the power supply voltage to obtain a power supply voltage of the first voltage level. The power input terminal of the second power circuit is connected to the power output terminal of the first power circuit, and is used to obtain the power supply voltage of the first voltage level from the first power circuit, and to step down the power supply voltage of the first voltage level to obtain the power supply voltage of the second voltage level, so as to supply power to the Bluetooth chip, the bias circuit and the voltage divider circuit.
3. The sound acquisition system according to claim 2, characterized in that, The first power supply circuit includes a first anti-static diode, a power switch circuit, an inductor, a boost chip, a seventh resistor, an eighth resistor, and a capacitor filter circuit. The first terminal of the first antistatic diode is connected to the positive terminal of the power supply battery and the first input terminal of the power switch circuit, respectively, and the second terminal of the first antistatic diode is grounded. The first output terminal of the power switch circuit is connected to the first terminal of the inductor, the second terminal of the inductor is connected to the chip power interface of the boost chip, and the second output terminal of the power switch circuit is connected to the voltage input interface and the logic control input interface of the boost chip respectively. The power switch circuit is used to controllably keep the positive terminal of the power supply battery in a conducting or disconnected state with the inductor and the boost chip. The voltage output interface of the boost chip is connected to the input terminal of the capacitor filter circuit. The output terminal of the capacitor filter circuit is used to output the power supply voltage of the first voltage level. The capacitor filter circuit is used to filter the voltage output by the voltage output interface of the boost chip. The output terminal of the capacitor filter circuit is also connected to the first terminal of the seventh resistor. The second terminal of the seventh resistor is connected to the voltage feedback input interface of the boost chip and the first terminal of the eighth resistor. The second terminal of the eighth resistor is grounded.
4. The sound acquisition system according to claim 3, characterized in that, The power switch circuit includes a circuit switch, a fourth capacitor, and a fifth capacitor, wherein the circuit switch includes a first input sub-terminal, a second input sub-terminal, a first output sub-terminal, and a second output sub-terminal. The first input terminal and the second input terminal of the circuit switch are connected to the first terminal of the first anti-static diode. The first output terminal of the circuit switch is connected to the first terminal of the inductor and the first terminal of the fifth capacitor, respectively. The second output terminal of the circuit switch is connected to the first terminal of the fourth capacitor, the first terminal of the fifth capacitor, the voltage input interface of the boost chip, and the logic control input interface of the boost chip, respectively. The circuit switch is configured to be controlled to be in a conducting or disconnected state between the first input sub-terminal and the first output sub-terminal of the circuit switch, and to be controlled to be in a conducting or disconnected state between the second input sub-terminal and the second output sub-terminal of the circuit switch. The second terminal of the fourth capacitor and the fifth capacitor are grounded.
5. The sound acquisition system according to claim 3, characterized in that, The capacitor filter circuit includes a sixth capacitor, a seventh capacitor, an eighth capacitor, and a ninth capacitor connected in parallel. The capacitance values of the sixth capacitor and the seventh capacitor are equal, and the capacitance values of the eighth capacitor and the ninth capacitor are equal but less than the capacitance values of the sixth capacitor and the seventh capacitor. The first terminal of the sixth capacitor, the first terminal of the seventh capacitor, the first terminal of the eighth capacitor, and the first terminal of the ninth capacitor are respectively connected between the voltage output interface of the boost chip and the first terminal of the seventh resistor. The connection terminal of the sixth capacitor, the second terminal of the seventh capacitor, the second terminal of the eighth capacitor, and the second terminal of the ninth capacitor is grounded.
6. The sound acquisition system according to claim 3, characterized in that, The second power supply circuit includes a second anti-static diode, a step-down chip, a light-emitting diode, a ninth resistor, a tenth capacitor, and an eleventh capacitor; The first terminal of the second anti-static diode is connected to the output terminal of the capacitor filter circuit, the first terminal of the tenth capacitor, and the voltage input terminal of the step-down chip, respectively, and the second terminal of the second anti-static diode and the second terminal of the tenth capacitor are grounded. The voltage output terminal of the step-down chip is connected to the first terminal of the eleventh capacitor and the anode terminal of the light-emitting diode, respectively. The voltage output terminal of the step-down chip is used to output the power supply voltage of the second voltage level. The second terminal of the eleventh capacitor is grounded, the cathode of the light-emitting diode is connected to the first terminal of the ninth resistor, and the second terminal of the ninth resistor is grounded.