A sound-based volume amplification transmission circuit

Abstract

The utility model provides a kind of based on the volume expansion transmission circuit of sound, comprising: power module, code scanning control module, relay module, power amplifier module, microphone module and loudspeaker module;Wherein: the power module is used to provide 12V DC power supply;The code scanning control module includes code scanning identification unit and control circuit, the code scanning identification unit is used to identify external code scanning signal, the control circuit is connected with the relay module, for driving the relay module conduction when identifying effective code scanning signal;The input of the relay module is connected with the power module, output is connected with the power amplifier module, for realizing the on-off of the power amplifier module according to the control signal of the control circuit;The input of the power amplifier module is connected with the microphone module, output is connected with the loudspeaker module, for amplifying processing to the audio signal transmission of the microphone module.

Description

Technical Field

[0001] This utility model relates to a sound-based volume amplification and transmission circuit. Background Technology

[0002] Modern people face more and more opportunities and competition, and therefore the pressure they need to bear is also increasing. This is an unchangeable fact. In order to live a relaxed and happy life, we must face the challenge of pressure and use appropriate methods to relieve our stress.

[0003] Chinese invention patent CN111078007A discloses a shouting catharsis training method and device based on virtual reality. By collecting users' physiological information and parameters such as the intensity, frequency, and duration of shouting sounds, it calculates the stress index before and after catharsis and generates personalized stress catharsis programs based on interactive control of virtual scenes.

[0004] However, the above-mentioned technical solutions are mainly aimed at psychological intervention applications in virtual environments, and are costly and inefficient, making them unsuitable for widespread adoption. Summary of the Invention

[0005] To address the technical problem of the lack of low-cost psychological stress relief devices in existing technologies that can benefit more people, a sound-based volume amplification and transmission circuit is proposed.

[0006] The technical solution of this utility model is: a sound-based volume amplification and transmission circuit, comprising: a power supply module, a barcode scanning control module, a relay module, a power amplifier module, a microphone module, and a loudspeaker module; wherein:

[0007] The power supply module is used to provide 12V DC power, including a battery pack and an AC-DC conversion unit, which is used to convert 220V AC power to 12V DC power.

[0008] The barcode scanning control module includes a barcode scanning recognition unit and a control circuit. The barcode scanning recognition unit is used to recognize external barcode scanning signals, and the control circuit is connected to the relay module and is used to drive the relay module to conduct when a valid barcode scanning signal is recognized.

[0009] The input terminal of the relay module is connected to the power supply module, and the output terminal is connected to the power amplifier module, which is used to realize the switching on and off of the power amplifier module according to the control signal of the control circuit.

[0010] The input terminal of the power amplifier module is connected to the microphone module, and the output terminal is connected to the loudspeaker module, for amplifying the audio signal transmitted by the microphone module;

[0011] The microphone module is used to collect external sound and convert it into electrical signals;

[0012] The loudspeaker module is used to receive the amplified signal from the power amplifier module and output sound.

[0013] In one optional embodiment, the control circuit includes a countdown unit with a graded control output terminal, which outputs a control signal that progressively reduces the power supply voltage of the power amplifier module at a preset time point before the countdown ends, and outputs a disconnection control signal when the countdown ends.

[0014] In one optional embodiment, the battery pack is a lithium battery pack and is provided with a power detection unit for detecting the power of the battery pack and outputting a detection signal.

[0015] In one optional embodiment, a power dispatching circuit is provided between the battery pack and the AC-DC conversion unit. When the output power of the power amplifier module is detected to exceed a preset threshold, the power dispatching circuit connects the battery pack and the AC-DC power supply module in parallel to suppress voltage fluctuations.

[0016] In one optional embodiment, the microphone module includes an electret microphone, an acoustic impedance matching component, and a preamplifier circuit. The acoustic impedance matching component is disposed between the electret microphone and the preamplifier circuit, and the preamplifier circuit is used to perform primary amplification of the audio signal output by the electret microphone.

[0017] In one optional embodiment, the loudspeaker module includes a tweeter and a woofer, respectively used to output amplified signals in different frequency bands;

[0018] The amplifier module is set at a relative angle by an acoustic guide cover, so that the high-frequency sound beam is directed to the target area through the tweeter, and the low-frequency sound wave is diffused in the surrounding area through the woofer.

[0019] In one optional embodiment, the relay module is a dual-channel relay module, wherein the first channel is used to control the power supply of the power amplifier module, and the second channel is used to control the delayed disconnection of the power supply of the loudspeaker module, so as to eliminate the transient impact when the power amplifier module is powered off.

[0020] In one optional embodiment, the scanning and recognition unit is a dual-mode recognition unit that supports both QR code and NFC recognition;

[0021] The QR code recognition unit outputs a control signal of corresponding level according to the amount paid by the user via QR code. The control signal is connected to the volume control terminal of the power amplifier module to limit the maximum output sound pressure level under different usage settings.

[0022] In an optional embodiment, the volume amplification transmission circuit further includes a partition with a built-in metal heat sink, the partition being used to isolate the power supply module from the amplifier module and to guide the incident sound waves of the microphone module's acquisition area through an acoustic reflective surface.

[0023] In one alternative embodiment, the power amplifier module is a Class D power amplifier circuit that includes a filter unit for low-pass filtering of the amplified signal.

[0024] The beneficial effects of this utility model are as follows:

[0025] 1. This utility model provides a sound amplification and transmission circuit that integrates barcode scanning control, power amplifier circuit and multi-mode power supply, which can achieve stable power supply and efficient audio amplification in different scenarios.

[0026] 2. Through a tiered countdown unit and dual relays, the power amplifier and loudspeaker are gradually shut down, reducing shutdown pops and transient impacts, and improving circuit reliability. The power dispatching circuit dynamically allocates the power supply modes of the battery and AC power according to the power amplifier power, effectively suppressing voltage fluctuations and making it suitable for high-power playback scenarios.

[0027] 3. The microphone module incorporates acoustic impedance matching components to enhance pickup sensitivity at specific frequencies and optimizes signal input quality in conjunction with a preamplifier circuit. The loudspeaker module uses a combination of directional tweeters and wide-angle woofers, achieving directional propagation in the target area and balanced diffusion in the surrounding area through an acoustic guide. The power amplifier module is based on a Class D amplifier circuit and equipped with a low-pass filter unit to reduce high-frequency distortion, improve sound quality, and enhance energy efficiency.

[0028] 4. The QR code scanning control module adjusts the output level according to the payment amount, realizing dynamic control of the volume level, which expands the interactivity and usage level of the device.

[0029] 5. The casing design isolates the power supply module and the audio processing module, while utilizing metal heat sinks and acoustic reflective surfaces to achieve the dual functions of heat dissipation and sound field optimization. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a sound-based volume amplification and transmission circuit according to the present invention.

[0031] Figure 2 This is a schematic diagram of another structure of a sound-based volume amplification and transmission circuit according to this utility model.

[0032] Figure 3 This is a schematic diagram of the power supply module of this utility model.

[0033] Figure 4This is a schematic diagram of the microphone module of this utility model. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0035] In this invention, terms such as "in one possible embodiment," "exemplary," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "in one possible embodiment," "exemplary," or "for example" in this invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "in one possible embodiment," "exemplary," or "for example" is intended to present the relevant concepts in a concrete manner.

[0036] Figure 1 This is a schematic diagram of a sound-based volume amplification and transmission circuit according to this utility model. Figure 1 As shown, the sound-based volume amplification and transmission circuit 10 proposed in this utility model includes: a power supply module 101, a barcode scanning control module 102, a relay module 103, a power amplifier module 104, a microphone module 105, and a loudspeaker module 106; wherein:

[0037] The power supply module is used to provide 12V DC power, including a battery pack and an AC-DC conversion unit, which is used to convert 220V AC power to 12V DC power.

[0038] The barcode scanning control module includes a barcode scanning recognition unit and a control circuit. The barcode scanning recognition unit is used to recognize external barcode scanning signals, and the control circuit is connected to the relay module and is used to drive the relay module to conduct when a valid barcode scanning signal is recognized.

[0039] The input terminal of the relay module is connected to the power supply module, and the output terminal is connected to the power amplifier module, which is used to realize the switching on and off of the power amplifier module according to the control signal of the control circuit.

[0040] The input terminal of the power amplifier module is connected to the microphone module, and the output terminal is connected to the loudspeaker module, for amplifying the audio signal transmitted by the microphone module;

[0041] The microphone module is used to collect external sound and convert it into electrical signals;

[0042] The loudspeaker module is used to receive the amplified signal from the power amplifier module and output sound.

[0043] Figure 2 This is a schematic diagram of another structure of a sound-based volume amplification and transmission circuit according to this utility model. Figure 2 As shown, the input power of the sound-based volume amplification transmission circuit in this embodiment is a 12V DC power supply, which can be provided by a lithium battery pack or 220V AC power converted by an AC-to-DC module. The QR code payment control board is used to identify the user's QR code scanning signal and output control commands to drive the electromagnetic relay switch. When the user completes the QR code payment, the control board turns on the relay, and the power amplifier system receives power. The power amplifier system is connected to the microphone, receives the raw sound signal collected by the microphone, and amplifies it. At the same time, it can add functions such as sound resolution, noise reduction, and high-frequency current boost according to design requirements. The processed current signal is transmitted to the speaker module, and the speaker converts it into amplified sound wave output. The electromagnetic relay switch not only controls the on / off function of the power amplifier system, but also adjusts the maximum current through the power amplifier system according to its power requirements. The microphone, power amplifier system, and speaker together constitute the audio amplification link, while the QR code payment control board enables the volume amplification function on demand, allowing the entire circuit to achieve high-power, stable sound transmission outdoors or in specific scenarios.

[0044] For example, the power supply module can use a 12V 10Ah lithium battery and a 220V to 12V 5A switching power supply, and connect to the control board through a bidirectional power interface; the barcode scanning control module can use an STM32-based control unit and a QR code scanning module; the relay can be a 30A power relay; the power amplifier module can use a Class D TDA7498E chip; the microphone can be an electret condenser microphone; and the amplifier can be a 50W tweeter horn and a 100W woofer.

[0045] In one optional embodiment, the control circuit includes a countdown unit with a graded control output terminal, which outputs a control signal that progressively reduces the power supply voltage of the power amplifier module at a preset time point before the countdown ends, and outputs a disconnection control signal when the countdown ends.

[0046] For example, the countdown unit can use the PWM output control built into the MCU. By adjusting the duty cycle of the MOSFET at the power supply end of the power amplifier, the voltage is gradually reduced to 50% 2 seconds before power-off, and then the relay disconnect signal is output after a delay of 500ms to achieve gradual power-off.

[0047] In one optional embodiment, the battery pack is a lithium battery pack and is provided with a power detection unit for detecting the power of the battery pack and outputting a detection signal.

[0048] For example, the power detection unit can use the INA219 current / voltage detection chip to transmit real-time battery voltage and current data to the control board via the I²C bus, and issue a warning signal when the power is below 20%.

[0049] Figure 3 This is a schematic diagram of the power supply module of this utility model. In an optional embodiment, such as... Figure 3 As shown, a power scheduling circuit is provided between the battery pack and the AC-DC conversion unit. When the output power of the power amplifier module is detected to exceed a preset threshold, the power scheduling circuit connects the battery pack and the AC-DC power supply module in parallel to suppress voltage fluctuations.

[0050] For example, the power dispatching circuit can be implemented through a power MOS parallel switching module. When the power amplifier output power is detected to exceed 80W, the control logic drives the parallel MOS to conduct, so that the AC power supply and the battery can supply power at the same time.

[0051] Figure 4 This is a schematic diagram of the microphone module of this utility model. In an optional embodiment, such as... Figure 4 As shown, the microphone module includes an electret microphone, an acoustic impedance matching component, and a preamplifier circuit. The acoustic impedance matching component is disposed between the electret microphone and the preamplifier circuit, and the preamplifier circuit is used to perform primary amplification of the audio signal output by the electret microphone.

[0052] For example, the acoustic impedance matching component consists of an acoustic sponge and a short-tube acoustic cavity, which improves the sensitivity of the electret microphone by approximately 6 dB in the 1–3 kHz frequency band; the preamplifier circuit uses a low-noise operational amplifier OPA1652. Placing an acoustic impedance matching component between the electret microphone and the preamplifier circuit can improve the acquisition sensitivity within a specific frequency range to adapt to the sound wave reflection characteristics of mountainous environments.

[0053] In addition, an ambient noise sensor can be added to the front end of the microphone, and the power amplifier module can automatically adjust the gain according to the noise level to keep the output sound pressure level relatively stable.

[0054] In one optional embodiment, the loudspeaker module includes a tweeter and a woofer, respectively used to output amplified signals in different frequency bands;

[0055] The amplifier module is set at a relative angle by an acoustic guide cover, so that the high-frequency sound beam is directed to the target area through the tweeter, and the low-frequency sound wave is diffused in the surrounding area through the woofer.

[0056] For example, the acoustic guide cover of the loudspeaker is injection molded from ABS, with the tweeter having a directivity of ±15° and the woofer having a directivity of ±90°, and the included angle is set to 30° to adapt to the reflection and diffusion characteristics of mountainous environments.

[0057] In one optional embodiment, the relay module is a dual-channel relay module, wherein the first channel is used to control the power supply of the power amplifier module, and the second channel is used to control the delayed disconnection of the power supply of the loudspeaker module, so as to eliminate the transient impact when the power amplifier module is powered off.

[0058] For example, the dual-channel relay can be selected from two independently driven 40A power relays. The first channel directly controls the power amplifier power supply, and the second channel is controlled by the MCU with a delay. After the first channel is disconnected, the amplifier power is turned off after a delay of 100ms.

[0059] In one optional embodiment, the scanning and recognition unit is a dual-mode recognition unit that supports both QR code and NFC recognition;

[0060] The QR code recognition unit outputs a control signal of corresponding level according to the amount paid by the user via QR code. The control signal is connected to the volume control terminal of the power amplifier module to limit the maximum output sound pressure level under different usage settings.

[0061] For example, the QR code recognition unit can use a two-dimensional image acquisition module and a 13.56MHz NFC chip, with payment amounts divided into three levels: low level 5 yuan corresponds to a maximum sound pressure level of 90dB, mid level 10 yuan corresponds to 100dB, and high level 20 yuan corresponds to 110dB.

[0062] In addition, an offline emergency mode for QR code control can be set. When the network is interrupted, the control circuit can activate one-time use permission through a local button, and the power supply time is the default setting value.

[0063] In an optional embodiment, the volume amplification transmission circuit further includes a partition with a built-in metal heat sink, the partition being used to isolate the power supply module from the amplifier module and to guide the incident sound waves of the microphone module's acquisition area through an acoustic reflective surface.

[0064] For example, the partition can be made of aluminum alloy stamping with a thickness of 2mm, which also serves as a heat sink. A reflective film is pasted on the inner surface to guide some of the incident sound waves to the microphone area, thereby improving the spatial consistency of sound pickup.

[0065] In addition, an outer casing can be installed, which can be IP65 rated, and the microphone module can be fitted with a waterproof and sound-permeable membrane, making it suitable for long-term outdoor operation.

[0066] In one alternative embodiment, the power amplifier module is a Class D power amplifier circuit that includes a filter unit for low-pass filtering of the amplified signal.

[0067] For example, the power amplifier low-pass filter unit can be composed of an inductor of 10μH and a capacitor of 220nF, with a cutoff frequency of about 30kHz, which can effectively suppress switching ripple.

[0068] In addition, a phase compensation circuit and an adaptive filter module can be added to the power amplifier input to detect and reduce feedback howling signals, adapting to close-range microphone pickup scenarios.

[0069] It can also use a wireless radio frequency module to synchronize the volume of multiple loudspeakers and the start-up of power amplifiers, so as to form a larger sound field coverage.

[0070] In this embodiment, through the above structure, the present invention provides a sound amplification and transmission circuit that integrates barcode scanning control, power amplifier circuit, and multi-mode power supply, enabling stable power supply and efficient audio amplification in different scenarios. A graded control countdown unit and dual relays achieve progressive shutdown of the power amplifier and loudspeaker, reducing shutdown pops and transient impacts, and improving circuit reliability. The power scheduling circuit dynamically allocates the power supply modes of the battery and AC power supply according to the power amplifier power, effectively suppressing voltage fluctuations and suitable for high-power playback scenarios. The microphone module incorporates an acoustic impedance matching component, enhancing the pickup sensitivity at specific frequencies, and optimizes signal input quality in conjunction with the preamplifier circuit. The loudspeaker module uses a combination of directional tweeters and wide-angle woofers, achieving directional propagation in the target area and balanced diffusion in the surrounding area through an acoustic guide. The power amplifier module is based on a Class D amplifier circuit and equipped with a low-pass filter unit to reduce high-frequency distortion, improve sound quality, and increase energy efficiency. The barcode scanning control module adjusts the output level according to the payment amount, achieving dynamic control of the volume level, expanding the interactivity and usage levels of the device. The casing design isolates the power supply module from the audio processing module, while utilizing metal heat sinks and acoustic reflective surfaces to achieve both heat dissipation and sound field optimization.

[0071] The embodiments described above have been illustrated with reference to specific examples. However, this disclosure is not limited to these specific examples. Design modifications appropriate to those skilled in the art, provided the features of this disclosure are present in these specific examples, are also included within the scope of this disclosure. The elements, their configurations, conditions, shapes, etc., in the above-described specific examples are not limited to the illustrated elements and can be appropriately modified. The combination of the elements in the above-described specific examples can be appropriately changed as long as it does not create a technical contradiction.

Claims

1. A sound-based volume amplification and transmission circuit, characterized in that, include: The module includes a power supply module, a barcode scanning control module, a relay module, a power amplifier module, a microphone module, and a loudspeaker module; among which: The power supply module is used to provide 12V DC power, including a battery pack and an AC-DC conversion unit, which is used to convert 220V AC power to 12V DC power. The barcode scanning control module includes a barcode scanning recognition unit and a control circuit. The barcode scanning recognition unit is used to recognize external barcode scanning signals, and the control circuit is connected to the relay module and is used to drive the relay module to conduct when a valid barcode scanning signal is recognized. The input terminal of the relay module is connected to the power supply module, and the output terminal is connected to the power amplifier module, which is used to realize the switching on and off of the power amplifier module according to the control signal of the control circuit. The input terminal of the power amplifier module is connected to the microphone module, and the output terminal is connected to the loudspeaker module, for amplifying the audio signal transmitted by the microphone module; The microphone module is used to collect external sound and convert it into electrical signals; The loudspeaker module is used to receive the amplified signal from the power amplifier module and output sound.

2. The sound-based volume amplification and transmission circuit according to claim 1, characterized in that, The control circuit includes a countdown unit with a graded control output terminal, which outputs a control signal that progressively reduces the power supply voltage of the power amplifier module at a preset time point before the countdown ends, and outputs a disconnection control signal when the countdown ends.

3. The sound-based volume amplification and transmission circuit according to claim 1, characterized in that, The battery pack is a lithium battery pack, and is equipped with a power detection unit for detecting the power of the battery pack and outputting a detection signal.

4. The sound-based volume amplification and transmission circuit according to claim 1, characterized in that, A power scheduling circuit is provided between the battery pack and the AC-DC conversion unit. When the output power of the power amplifier module is detected to exceed a preset threshold, the power scheduling circuit connects the battery pack and the AC-DC power supply module in parallel to suppress voltage fluctuations.

5. The sound-based volume amplification and transmission circuit according to claim 1, characterized in that, The microphone module includes an electret microphone, an acoustic impedance matching component, and a preamplifier circuit. The acoustic impedance matching component is disposed between the electret microphone and the preamplifier circuit, and the preamplifier circuit is used to perform primary amplification of the audio signal output by the electret microphone.

6. The sound-based volume amplification and transmission circuit according to claim 1, characterized in that, The loudspeaker module includes a tweeter and a woofer, which are used to output amplified signals in different frequency bands, respectively. The amplifier module is set at a relative angle by an acoustic guide cover, so that the high-frequency sound beam is directed to the target area through the tweeter, and the low-frequency sound wave is diffused in the surrounding area through the woofer.

7. The sound-based volume amplification and transmission circuit according to claim 1, characterized in that, The relay module is a dual-channel relay module, wherein the first channel is used to control the power supply of the power amplifier module, and the second channel is used to control the delayed disconnection of the power supply of the loudspeaker module to eliminate the transient impact when the power amplifier module is powered off.

8. The sound-based volume amplification and transmission circuit according to claim 1, characterized in that, The scanning and recognition unit is a dual-mode recognition unit that supports both QR code and NFC recognition; The QR code recognition unit outputs a control signal of corresponding level according to the amount paid by the user via QR code. The control signal is connected to the volume control terminal of the power amplifier module to limit the maximum output sound pressure level under different usage settings.

9. The sound-based volume amplification and transmission circuit according to claim 1, characterized in that, The volume amplification transmission circuit also includes a partition with a built-in metal heat sink. The partition is used to isolate the power supply module from the amplifier module and guide the incident sound waves to the acquisition area of ​​the microphone module through an acoustic reflective surface.

10. The sound-based volume amplification and transmission circuit according to claim 1, characterized in that, The power amplifier module is a Class D power amplifier circuit that includes a filter unit for low-pass filtering of the amplified signal.

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