Bimodal combined directional sound system and device thereof

Abstract

The utility model relates to a dual-mode combined directional sound system and a device thereof, which comprise a pre-processing module, a digital signal processor (DSP) digital audio processing module, a phased array module, an ultrasonic module and a power supply, and an analog-to-digital converter (ADC) module is connected with the power supply and the DSP digital audio processing module. The phased array module is used for converting an analog signal input by a sound source signal into an audio digital signal, and the DSP digital audio processing module is connected with the phased array module and the ultrasonic module and is used for carrying out band-pass frequency division processing on the audio digital signal and sending a low and medium frequency audio digital signal after frequency division processing to the phased array module; the high-frequency audio digital signal is sent to the ultrasonic module; the loudspeaker array has the characteristics of a directional propagation technology of a loudspeaker array and an audio frequency directional propagation technology of ultrasound, avoids the defects of the loudspeaker array and the audio frequency directional propagation technology in a high-frequency band and a low-frequency band, and has higher sound directionality and excellent sound propagation quality.

Description

Technical Field

[0001] The utility model relates to the technical field of directional audio, and particularly relates to a dual-mode combined directional audio system and its device. Background Technique

[0002] Directional sound technology is a technology that controls sound waves to be directionally transmitted within a certain area of space. Different from the sound waves emitted by traditional speakers that spread in all directions, directional sound technology can only transmit sound in a specific area, and the sound decays rapidly outside the specific area and is hardly audible. Therefore, it has good privacy and reduces the generation of noise, and has broad application prospects in both military and civilian fields.

[0003] Currently, there are mainly the following three types of directional sound technologies: 1. The sound focusing hood technology, which is the simplest. That is, a large hemispherical hood is placed on the speaker, and people can clearly hear the sound under the sound focusing hood; 2. The speaker array technology, which uses a large number of high-frequency speakers to form an array to form a beam, and the energy is the highest in the direction of the beam, that is, the main lobe direction; 3. The ultrasonic-based audio frequency directional propagation technology, which modulates the sound onto the ultrasonic wave for transmission and uses self-demodulation in the air to generate sound when it encounters an interface. This technology is reliable and has good effects. However, each of these three technologies has its own defects: 1. Although the sound focusing hood can change the direction and path of sound propagation through the isolation effect, sound absorption effect, and refraction and diffraction effects, its directivity is weak. In scenarios where precise directional sound emission is required, the sound focusing hood may not provide sufficient directivity, and the sound scattering range of the sound focusing hood is large and the transmission distance is relatively short, which limits its use in applications that require long-distance sound transmission; 2. Due to the interference and superposition of sound waves between different speakers in the speaker array technology, the sound in the high-frequency band is more sensitive to changes in phase and amplitude. Therefore, the debugging and calibration of the speaker array in the high-frequency band are difficult, and it is easy to cause problems such as a decline in sound quality, such as distortion and increased noise; 3. The ultrasonic-based audio frequency directional propagation technology relies on the non-linear interaction between ultrasonic waves and air to generate audible sound waves. However, in the low-frequency band, this non-linear effect is relatively weak, resulting in a low conversion efficiency. Higher ultrasonic power is required to generate sufficient audible sound waves, which increases the complexity and cost of the equipment. Due to the low conversion efficiency of ultrasonic waves in the low-frequency band, the low-frequency audible sound wave components carried thereon may be insufficient, which will cause the sound to lack sufficient fullness and depth in the low-frequency band and affect the overall auditory experience. Content of the Utility Model

[0004] In view of this, in view of the deficiencies of the existing technology, the main purpose of the present utility model is to provide a dual-modal combined directional audio system and its device, which simultaneously has the characteristics of the directional propagation technology of the speaker array and the audio frequency directional propagation technology of ultrasonic waves, and avoids the defects of the two in the high-frequency band and the low-frequency band, and has higher sound directivity and excellent sound propagation quality.

[0005] To achieve the above object, the present utility model adopts the following technical solutions:

[0006] A dual-modal combined directional audio system includes a pre-processing module, a DSP digital audio processing module, a phased array module, an ultrasonic module and a power supply. The pre-processing module includes an ADC analog-to-digital module, and the ADC analog-to-digital module is connected to the power supply and the DSP digital audio processing module. It is used to convert the analog signal input from the sound source signal into an audio digital signal and send it to the DSP digital audio processing module. The DSP digital audio processing module is respectively connected to the phased array module and the ultrasonic module. It is used to perform band-pass frequency division processing on the received audio digital signal, and send the divided mid-low frequency audio digital signal to the phased array module, and send the divided high-frequency audio digital signal to the ultrasonic module. The phased array module is used to process the mid-low frequency audio digital signal and directionally output sound waves through the wave group interference effect. The ultrasonic module is used to process the high-frequency audio digital signal and directionally output sound waves through the non-linear effect.

[0007] As a preferred solution, the phased array module includes multiple mid-low frequency audio processing modules. Each mid-low frequency audio processing module includes a delay audio processing module, a power amplification module and a speaker module, and a plurality of the speaker modules form a speaker surface array combination.

[0008] As a preferred solution, the DSP digital audio processing module is used to perform frequency division processing on the received audio digital signal, divide the divided mid-low frequency audio digital signal into multiple groups according to frequency bands, and send the mid-low frequency audio digital signals of each frequency band to the corresponding multiple mid-low frequency audio processing modules.

[0009] As a preferred solution, the delay audio processing module includes a DAC conversion module and a delay adjustment module. The DAC conversion module is used to convert the mid-low frequency audio digital signal sent by the DSP digital audio processing module into an audio analog signal. The delay adjustment module is used to adjust the phase delay of the analog audio signal sent by each mid-low frequency audio processing module to the speaker.

[0010] As a preferred solution, the ultrasonic module includes an MCU carrier processing module, a DAC digital-to-analog processing module, a power amplification module, and an ultrasonic ceramic transducer array.

[0011] This application also provides a dual-mode combined directional sound device, which includes the above-mentioned dual-mode combined directional sound system of the claims, and further includes a housing. A preprocessing module, a DSP digital audio processing module, a phased array module, and an ultrasonic module are provided inside the housing.

[0012] As a preferred solution, two hollow windows are provided on the front side of the housing, and the ultrasonic ceramic transducer array and the speaker surface array combination are respectively arranged in the hollow windows.

[0013] As a preferred solution, a honeycomb-shaped mesh cover is provided on the hollow window.

[0014] As a preferred solution, a baffle is provided at the upper end of the front side of the housing.

[0015] As a preferred solution, the power supply includes a battery.

[0016] Compared with the prior art, the above-mentioned dual-mode combined directional sound system has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solutions, it mainly divides the received audio digital signal through the DSP digital audio processing module, and sends the divided mid-low frequency audio digital signal to the phased array module, and sends the divided high frequency audio digital signal to the ultrasonic module. The phased array module is used to process the mid-low frequency audio digital signal and directionally output sound waves through the wave group interference effect, and the ultrasonic module is used to process the high frequency audio digital signal and directionally output sound waves through the nonlinear effect. Based on the combined action of the ultrasonic high-frequency directional sound beam and the phased array-based directional sound wave, the combined dual-mode adjustable directional sound wave of this application is formed. It simultaneously has the characteristics of the directional propagation technology of the speaker array and the audio frequency directional propagation technology of ultrasound, and avoids the defects of both in the high frequency band and the low frequency band. It has higher sound directivity, can ensure that the sound propagates along a predetermined path, and generates the maximum sound pressure level at a specified position, which helps to reduce the leakage and diffusion of sound, reduce the interference to the surrounding environment, achieve more accurate and longer-distance sound directional propagation, and ensure that the sound maintains high sound quality and clarity during the propagation process, thereby improving the quality of sound directional propagation. Description of the Drawings

[0017] Figure 1 is the flow schematic diagram of the dual-mode combined directional sound system of the embodiment of the present invention.

[0018] Figure 2It is a schematic structural diagram of a dual - mode combined directional audio device according to an embodiment of the present utility model.

[0019] Figure 3 It is a front view of a dual - mode combined directional audio device according to an embodiment of the present utility model.

[0020] Explanation of reference numerals:

[0021] 100, housing; 110, hollow window; 120, mesh cover; 140, baffle. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments; based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0024] Please refer to Figures 1 to 3, showing a dual - mode combined directional audio system and its device provided by an embodiment of the present utility model, including a pre - processing module, a DSP digital audio processing module, a phased - array module, an ultrasonic module, and a power supply. The pre - processing module includes an ADC analog - to - digital module, which is connected to the power supply and the DSP digital audio processing module. It is used to convert the analog signal input from the sound source signal into an audio digital signal and send it to the DSP digital audio processing module. The DSP digital audio processing module is respectively connected to the phased - array module and the ultrasonic module. It is used to perform band - pass frequency - division processing on the received audio digital signal, and send the mid - low - frequency audio digital signal after frequency - division processing to the phased - array module, and send the high - frequency audio digital signal after frequency - division processing to the ultrasonic module. The phased - array module is used to process the mid - low - frequency audio digital signal and directionally output sound waves through the wave - group interference effect. The ultrasonic module is used to process the high - frequency audio digital signal and directionally output sound waves through the non - linear effect. The power supply is used to supply power to the whole system. Based on the combined action of the ultrasonic high - frequency directional sound wave beam and the phased - array - based directional sound wave, the combined dual - mode adjustable directional sound wave of this application is formed. It has the characteristics of both the directional propagation technology of the speaker array and the audio - frequency directional propagation technology of ultrasound, and cancels out the respective defects of the two in the high - frequency and low - frequency bands, thereby improving the quality of the directional propagation of sound.

[0025] Further, the phased - array module includes multiple groups of mid - low - frequency audio processing modules. Each mid - low - frequency audio processing module includes a delay audio processing module, a power - amplification module, and a speaker module, and multiple speaker modules form a speaker surface - array combination. The phased - array technology of sound waves is a technology that changes the beam direction by controlling the phase difference of each element in the array. In the speaker surface - array combination, each speaker surface - array element can be regarded as a point sound source. By adjusting the phase difference of each point sound source, the sound waves can be superimposed and enhanced in a specific direction in space, and cancel each other out in other directions, thereby realizing directional control. By adjusting the phase difference of each element and the parameters of the output signal, flexible control of the beam directivity, beam width, and beam shape can be achieved. Through the weighted, delayed, and summed processing of the output signals of each element by multiple delay audio processing modules, the required beam shape and directivity are formed. This flexibility enables the phased - array speaker surface - array combination to meet the requirements of different application scenarios.

[0026] Further, the DSP digital audio processing module is used to perform frequency - division processing on the received audio digital signal, divide the mid - low - frequency audio digital signal after frequency - division processing into multiple groups according to frequency bands, and send the mid - low - frequency audio digital signals of each frequency band to the corresponding multiple mid - low - frequency audio processing modules. For example, if there are n groups of mid - low - frequency audio processing modules, the DSP digital audio processing module divides the mid - low - frequency audio digital signal into n groups of audio digital signals according to frequency bands and sends them to the corresponding n groups of mid - low - frequency audio processing modules respectively.

[0027] Furthermore, the delayed audio processing module includes a DAC conversion module and a delay adjustment module. The DAC conversion module is used to convert the medium and low frequency audio digital signals sent by the DSP digital audio processing module into audio analog signals. The delay adjustment module is used to adjust the phase delay of the analog audio signals sent by each medium and low frequency audio processing module to the speaker, control the curvature of the synthesized wavefront, so as to achieve the focusing of the beam, and can concentrate the energy in a specific direction, improving the detection sensitivity and resolution; by changing the phase delay, the direction of the beam can be adjusted to achieve the deflection of the beam.

[0028] Furthermore, the ultrasonic module includes an MCU carrier processing module, a DAC digital-to-analog processing module, a power amplification module, and an ultrasonic ceramic transducer array. The high-frequency audio digital signal after frequency division processing successively passes through the MCU carrier processing module, the DAC digital-to-analog processing module, the power amplification module, and the ultrasonic ceramic transducer array to generate an ultrasonic high-frequency directive sound beam, and the sound wave is directionally output through the nonlinear effect.

[0029] This application also provides a dual-mode combined directional sound device, including the above-mentioned dual-mode combined directional sound system in the claims, and further including a housing 100. Inside the housing 100, there are a pre-processing module, a DSP digital audio processing module, a phased array module, and an ultrasonic module.

[0030] Furthermore, two hollow windows 110 are provided on the front side of the housing 100, and the ultrasonic ceramic transducer array and the speaker surface array combination are respectively arranged inside the hollow windows 110.

[0031] Furthermore, a honeycomb-shaped mesh cover 120 is provided on the hollow window 110.

[0032] Furthermore, a baffle 140 is provided at the upper end of the front side of the housing 100.

[0033] Furthermore, the power supply includes a battery.

[0034] The above-mentioned dual-modal combined directional sound system has obvious advantages and beneficial effects compared with the prior art. Specifically, as can be seen from the above technical solution, it mainly performs frequency division processing on the received audio digital signal through the DSP digital audio processing module, sends the middle and low-frequency audio digital signal after frequency division processing to the phased array module, and sends the high-frequency audio digital signal after frequency division processing to the ultrasonic module. The phased array module is used to process the middle and low-frequency audio digital signal and directionally output sound waves through the wave group interference effect. The ultrasonic module is used to process the high-frequency audio digital signal and directionally output sound waves through the nonlinear effect. Based on the combined action of the ultrasonic high-frequency directional sound wave beam and the phased-array-based directional sound wave, the combined dual-mode adjustable directional sound wave of the present application is formed. It simultaneously has the characteristics of the directional propagation technology of the speaker array and the audio frequency directional propagation technology of ultrasound, and avoids the defects of both in the high-frequency band and the low-frequency band. It has higher sound directivity, can ensure that the sound propagates along a predetermined path, and generates the maximum sound pressure level at a specified position, helps to reduce the leakage and diffusion of sound, reduces the interference to the surrounding environment, realizes more accurate and longer-distance sound directional propagation, and ensures that the sound maintains high sound quality and clarity during the propagation process, thereby improving the quality of sound directional propagation.

[0035] It should be noted that the present utility model is not limited to the above embodiments. According to the creative spirit of the present utility model, those skilled in the art can also make other changes. These changes made based on the creative spirit of the present utility model should be included within the scope of protection required by the present utility model.

Claims

1. A dual-mode combined directional sound system, characterized in that: The invention comprises a pre-processing module, a DSP digital audio processing module, a phased array module, an ultrasonic module and a power supply. The pre-processing module comprises an ADC analog-to-digital conversion module, which is connected to the power supply and the DSP digital audio processing module and is used for converting the analog signal input by the sound source signal into an audio digital signal and sending it to the DSP digital audio processing module. The DSP digital audio processing module is respectively connected to the phased array module and the ultrasonic module and is used for performing bandpass frequency division processing on the received audio digital signal, and sending the medium and low frequency audio digital signal after the frequency division processing to the phased array module, and sending the high frequency audio digital signal after the frequency division processing to the ultrasonic module. The phased array module is used for processing the medium and low frequency audio digital signal and directionally outputting the sound wave through the wave group interference effect. The ultrasonic module is used for processing the high frequency audio digital signal and directionally outputting the sound wave through the nonlinear effect.

2. The dual-mode combined directional sound system according to claim 1, characterized in that: The phased array module includes multiple groups of mid- and low-frequency audio processing modules, each of which includes a delayed audio processing module, a power amplifier module and a speaker module, and multiple speaker modules constitute a speaker array combination. The ultrasonic module includes an MCU carrier processing module, a DAC digital analog processing module, a power amplifier module and an ultrasonic ceramic transducer array.

3. The dual-mode combined directional sound system as claimed in claim 2, characterized in that: The DSP digital audio processing module is used to perform frequency division processing on the received audio digital signal, and divide the mid- and low-frequency audio digital signals after frequency division processing into multiple groups according to frequency bands, and send the mid- and low-frequency audio digital signals of each frequency band to the corresponding multiple mid- and low-frequency audio processing modules.

4. The dual-mode combined directional sound system as claimed in claim 2, characterized in that: The delayed audio processing module includes a DAC conversion module and a delay adjustment module. The DAC conversion module is used to convert the mid- and low-frequency audio digital signals sent by the DSP digital audio processing module into audio analog signals. The delay adjustment module is used to adjust the phase delay of the analog audio signals sent to the speakers by each mid- and low-frequency audio processing module.

5. A dual-mode combined directional sound device, characterized in that: The directional sound system comprises the directional sound system according to any one of claims 1 to 4, and further comprises a shell, wherein a pre-processing module, a DSP digital audio processing module, a phased array module and an ultrasonic module are arranged in the shell.

6. The dual-mode combined directional acoustic device according to claim 5, characterized in that: Two hollow windows are provided on the front side of the shell, and the ultrasonic ceramic transducer array and the speaker array combination are respectively arranged in the hollow windows.

7. The dual-mode combined directional acoustic device according to claim 6, characterized in that: The upper cover of the hollow window is provided with a honeycomb mesh cover.

8. The dual-mode combined directional acoustic device according to claim 5, characterized in that: A baffle is provided at the upper end of the front side of the shell.

9. The dual-mode combined directional acoustic device according to claim 5, characterized in that: The power source includes a battery.

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