WO2023087774A1

WO2023087774A1 - Electric vehicle's low-speed pedestrian alert sound design method and system, and terminal and storage medium

Info

Publication number: WO2023087774A1
Application number: PCT/CN2022/108489
Authority: WO
Inventors: 王石; 刘英杰; 邓建交; 李允�; 曹蕴涛; 李�浩; 张程鹏; 张士强
Original assignee: 中国第一汽车股份有限公司
Priority date: 2021-11-17
Filing date: 2022-07-28
Publication date: 2023-05-25
Also published as: CN114265572A

Abstract

An electric vehicle's low-speed pedestrian alert sound design method and system, and a terminal and a storage medium, relating to the technical field of acoustic vehicle alerting systems. The method comprises: respectively obtaining a frequency response characteristic curve of a white noise signal, a frequency response characteristic curve at a pedestrian alert loudspeaker plane, a frequency response characteristic curve at a sound source loudspeaker plane, and a frequency response characteristic curve at the front end of a sound source loudspeaker vehicle; obtaining a comprehensive transfer function; obtaining a subjective output sound source material, and obtaining a subjective input sound source by means of the subjective output sound source material and the comprehensive transfer function; and obtaining a corrected input sound source by means of the subjective input sound source and the comprehensive transfer function. By means of the design of the sound source, the sound pressure level and the frequency spectrum change are compensated in advance, such that the problem of distortion of an alert sound heard by pedestrians is solved.

Description

A design method, system, terminal and storage medium for low-speed pedestrian notification sound of electric vehicles

technical field

The invention discloses a design method, a system, a terminal and a storage medium for an electric vehicle low-speed pedestrian prompting sound, and belongs to the technical field of electric vehicle prompting sound systems.

Background technique

The sounding principle of the low-speed pedestrian warning sound is that the sound source signal A is amplified by the power amplifier system, and the sound B is emitted from the speaker. The sound B is transmitted to the outside of the vehicle through parts such as the engine compartment cover, the floor, and the front bumper grille at the front of the vehicle, so that the pedestrians outside the vehicle can hear the sound C, thereby warning the pedestrians outside the vehicle.

Because the power amplifier-speaker system has certain frequency response characteristics, and after the sound is emitted from the speaker, it has to go through a series of transmission paths of parts before it can be transmitted to the outside of the car. Both systems will have an impact on the frequency spectrum and sound pressure level of the sound source. , so that the sound heard by pedestrians is distorted compared with the original sound source, which affects the sound quality and the auditory experience of pedestrians.

The main reason for affecting the sound quality and the hearing experience of pedestrians is that the distortion phenomenon will be affected by the transfer function during the outward propagation process. However, the existing technology focuses on the improvement of sound quality and the sound control strategy, and does not mention how to The problem of changing the distortion of the sound source to make it sound fuller.

Contents of the invention

Aiming at the defects of the existing technology, the present invention proposes a design method, system, terminal and storage medium for low-speed pedestrian prompting sound of electric vehicles. Prompt sound distortion problem.

Technical scheme of the present invention is as follows:

According to the first aspect of the embodiments of the present invention, there is provided a method for designing a warning sound for low-speed pedestrians in an electric vehicle, including:

Obtaining the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker, and the frequency response characteristic curve at the vehicle front end of the sound source speaker;

A comprehensive transfer function is obtained through the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker, and the frequency response characteristic curve at the vehicle front end of the sound source speaker;

Obtaining the subjective output sound source material, obtaining the subjective input sound source through the subjective output sound source material and the comprehensive transfer function;

A corrected version of the input sound source is obtained through the subjective input sound source and the integrated transfer function.

Preferably, it also includes:

The frequency response characteristic curve of the corrected version of the input sound source pedestrian warning speaker at the front end of the vehicle is obtained through the corrected version of the input sound source, and the corrected version of the input sound source is obtained through the corrected version of the frequency response characteristic curve of the input sound source pedestrian warning speaker at the vehicle front end and the subjective output sound source material .

Preferably, said acquisition of subjective output sound source material, obtaining subjective input sound source through said subjective output sound source material and comprehensive transfer function, including:

Obtain subjective output audio material;

Obtaining the frequency response characteristic function of the subjective output sound source material through the subjective output sound source material;

The subjective input sound source is obtained through the frequency response characteristic function of the subjective output sound source material and the comprehensive transfer function.

Preferably, the corrected version of the input sound source is obtained through the subjective input sound source and the integrated transfer function, including:

Obtaining a corrected version of the output sound source material through the subjective input sound source and the subjective output sound source material;

A corrected version of the input sound source is obtained through the corrected version of the output sound source material and the integrated transfer function.

Preferably, the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker, and the frequency response characteristic of the sound source speaker at the front end of the vehicle curves to obtain a composite transfer function consisting of:

The white noise signal is obtained respectively by the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker and the frequency response characteristic curve at the front end of the sound source speaker vehicle The frequency response characteristic function of the frequency response characteristic function of the pedestrian warning speaker plane, the frequency response characteristic function of the sound source speaker plane and the frequency response characteristic function of the sound source speaker vehicle front end;

Through the frequency response characteristic function of the white noise signal, the frequency response characteristic function at the plane of the pedestrian warning speaker, the frequency response characteristic function at the plane of the sound source speaker, and the frequency response characteristic function of the sound source speaker at the front end of the vehicle, the synthesis is obtained by formula (1) Transfer Function:

Among them: B is the frequency response characteristic function at the plane of the pedestrian warning speaker, A0 is the frequency response characteristic function of the white noise signal, E is the frequency response characteristic function of the sound source speaker at the front end of the vehicle, and D is the frequency response at the sound source speaker plane Characteristic function, Y is the comprehensive transfer function.

Preferably, the frequency response characteristic function of the subjective output audio source material obtained through the subjective output audio source material includes:

Obtaining the frequency response characteristic curve of the subjective output sound source material through the subjective output sound source material;

Obtaining the frequency response characteristic function of the subjective output sound source material through the subjective output sound source material frequency response characteristic curve;

Obtain subjective input sound source function by formula (2) by described subjective output sound source material frequency response characteristic function and comprehensive transfer function:

Among them, G is the subjective input sound source function, and F is the frequency response characteristic function of the subjective output sound source material;

The subjective input sound source is obtained through the subjective input sound source function.

Preferably, the corrected version of the input sound source is obtained through the corrected version of the output sound source material and the integrated transfer function, including:

Obtaining the frequency response characteristic curve of the output sound source material of the corrected version through the output sound source material of the corrected version;

Obtain the frequency response characteristic function of the output sound source material of the corrected version through the frequency response characteristic curve of the output sound source material of the corrected version;

The corrected version of the input sound source function is obtained through the corrected version of the frequency response characteristic function of the output sound source material and the integrated transfer function;

The corrected version of the input sound source is obtained through the corrected version of the input sound source function.

According to the second aspect of the embodiments of the present invention, there is provided a low-speed pedestrian alert sound design system for electric vehicles, the design system comprising:

The acquisition module is used to respectively acquire the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker, and the frequency response characteristic curve at the vehicle front end of the sound source speaker;

The fitting module is the same as passing through the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker, and the frequency response characteristic at the vehicle front end of the sound source speaker The curve gets the comprehensive transfer function;

The analysis module is used to obtain the subjective output sound source material, and obtain the subjective input sound source through the subjective output sound source material and the comprehensive transfer function.

The correction module is used to obtain a corrected version of the input sound source through the subjective input sound source and the integrated transfer function.

According to a third aspect of the embodiments of the present invention, a terminal is provided, including:

one or more processors;

memory for storing said one or more processor-executable instructions;

Wherein, the one or more processors are configured to:

Execute the method described in the first aspect of the embodiments of the present invention.

According to the fourth aspect of the embodiments of the present invention, there is provided a non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by the processor of the terminal, the terminal can execute the first aspect of the embodiments of the present invention the method described.

According to a fifth aspect of the embodiments of the present invention, an application program product is provided. When the application program product is running on a terminal, the terminal is made to execute the method described in the first aspect of the embodiments of the present invention.

The beneficial effects of the present invention are:

This patent provides a design method, system, terminal and storage medium for low-speed pedestrian warning sound of electric vehicles. Predict the sound pressure level and spectrum changes, so that through the design of the sound source, the sound pressure level and spectrum changes can be compensated in advance, so as to solve the problem of sound distortion heard by pedestrians.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

Description of drawings

Fig. 1 is a flow chart showing a method for designing a warning sound for low-speed pedestrians in an electric vehicle according to an exemplary embodiment;

Fig. 2 is the flowchart of a kind of electric vehicle low-speed pedestrian sound design method shown according to an exemplary embodiment;

Fig. 3 is a schematic diagram of measurement arrangement of pedestrian warning speakers in a method for designing low-speed pedestrian warning sounds of electric vehicles according to an exemplary embodiment;

Fig. 4 is a graph showing frequency response characteristic curves of white noise signals in a method for designing low-speed pedestrian alert sounds for electric vehicles according to an exemplary embodiment;

Fig. 5 is a frequency response characteristic curve at the plane of the pedestrian warning speaker in a method for designing the low-speed pedestrian warning sound of an electric vehicle according to an exemplary embodiment;

Fig. 6 is a schematic diagram of the measurement arrangement of sound source speakers in a method for designing low-speed pedestrian alert sounds for electric vehicles according to an exemplary embodiment;

Fig. 7 is a frequency response characteristic curve at the plane of the sound source speaker in a method for designing the sound of low-speed pedestrians in an electric vehicle according to an exemplary embodiment;

Fig. 8 is a frequency response characteristic curve of the sound source loudspeaker at the front end of the vehicle in a method for designing low-speed pedestrian alert sounds for electric vehicles according to an exemplary embodiment;

Fig. 9 is a comprehensive transfer function curve in a design method of low-speed pedestrian alert sound for electric vehicles according to an exemplary embodiment;

Fig. 10 is a frequency response characteristic curve of subjective output sound source material in a method for designing low-speed pedestrian alert sounds for electric vehicles according to an exemplary embodiment;

Fig. 11 is a frequency response characteristic curve of a corrected version output sound source material in a method for designing a sound for low-speed pedestrians in an electric vehicle according to an exemplary embodiment;

Fig. 12 is a frequency response characteristic curve of a corrected version of an input sound source in a method for designing a sound for low-speed pedestrians in an electric vehicle according to an exemplary embodiment;

Fig. 13 is a schematic structural block diagram of a system for designing low-speed pedestrian alert sounds for electric vehicles according to an exemplary embodiment;

Fig. 14 is a schematic block diagram showing a terminal structure according to an exemplary embodiment.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

An embodiment of the present invention provides a method for designing low-speed pedestrian notification sounds for electric vehicles. The method is implemented by a terminal. The terminal can be a smart phone, a desktop computer, or a notebook computer, and the terminal includes at least a CPU and a voice collection device.

Embodiment one

Fig. 1 is a flow chart of a method for designing a warning sound for low-speed pedestrians in an electric vehicle according to an exemplary embodiment. The method is used in a terminal, and the method includes the following steps:

Step 101, obtaining the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker, and the frequency response characteristic curve at the front end of the sound source speaker;

Step 102, through the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker, and the frequency response characteristic curve at the front end of the sound source speaker vehicle to obtain a synthesis Transfer Function;

Step 103, obtaining the subjective output sound source material, and obtaining the subjective input sound source through the subjective output sound source material and the comprehensive transfer function;

Step 104. Obtain a corrected version of the input sound source through the subjective input sound source and the integrated transfer function.

Preferably, it also includes:

Obtain subjective output audio material;

Embodiment two

Fig. 2 is a flow chart of a system transfer function-based method for designing a warning sound for low-speed pedestrians in an electric vehicle according to an exemplary embodiment. The method is used in a terminal, and the method includes the following steps:

Step 201, obtaining the frequency response characteristic curve of the white noise signal and the frequency response characteristic curve at the plane of the pedestrian warning speaker;

As shown in Figure 3, in the full anechoic room, the pedestrian alarm is fixed on the baffle, and the size of the baffle meets GB/T 12060.5 sound system equipment, so that the axis of the speaker is parallel to the ground. A microphone is fixed on the front axis of the speaker at a distance of 1m from the center plane diaphragm of the speaker. The microphone is connected to the test front-end, and the front-end analysis frequency bandwidth is set to 20480Hz. Calibrate the microphone with a calibration device. Input the white noise signal into the storage unit of the pedestrian alarm, and obtain the frequency response characteristic curve of the white noise from the network, as shown in Figure 4, the horizontal axis of the coordinate axis is the frequency, and the vertical axis is the sound pressure. The signal uses a simulator to simulate a vehicle speed of 1km/h, drives the pedestrian warning device to emit a pedestrian warning sound, and measures and records the effective value of the input voltage of the pedestrian warning device.

Start the device to collect the sound, and the collection time is 20s. Repeat the measurement for each test no less than 3 times, take the average value, and analyze the data in the FFT frequency domain with a frequency resolution of 2Hz to obtain the frequency response characteristic curve at the measurement point of the loudspeaker of the pedestrian warning device, because the geometry of the pedestrian warning device The size is much smaller than the distance from the center of the sound source to the measurement point, therefore, the pedestrian warning device can be considered as a point sound source. Knowing the frequency response characteristic curve at the measuring point, the attenuation value of the point sound source with the increase of the distance can be obtained according to the formula (1), and the attenuation value of the point sound source with the increase of the distance can be deduced from the attenuation value at the speaker plane of the pedestrian alarm The frequency response characteristic curve is shown in Figure 5.

In the formula:

AdiV = the attenuation value of a point sound source as the distance increases, in dB.

r ₁ and r ₂ are the distances from the point sound source, in m. Take r ₁ =1, r ₂ =0.01.

Step 202. Obtain a frequency response characteristic curve at the plane of the sound source speaker.

As shown in Figure 6, select a speaker with an effective frequency range of 200-5000Hz as the sound source. In the full anechoic room, fix the loudspeaker on the baffle (the size of the baffle meets GB/T 12060.5 Acoustic System Equipment Part 5: Main Performance Test Methods of Loudspeaker), so that the direction of the loudspeaker axis is parallel to the ground. A microphone is fixed on the front axis of the speaker at a distance of 1m from the center plane diaphragm of the speaker. The microphone is connected to the test front-end, and the front-end analysis frequency bandwidth is set to 20480Hz. Calibrate the microphone with a calibration device. Input the white noise signal into the speaker, drive the speaker to produce sound, adjust the signal voltage so that the total sound pressure level at the measuring point is the same as the total sound pressure level measured in step 202, measure and record the effective value of the input voltage.

Start the device to collect the sound, and the collection time is 20s. The measurement was repeated no less than 3 times for each test, and the results were averaged. Perform FFT frequency domain analysis on the data, the frequency resolution is 2Hz, and obtain the frequency response characteristic curve of the sound source speaker test point. Because the geometric size of the loudspeaker is much smaller than the distance between the center of the sound source and the measurement point, the loudspeaker can be considered as a point sound source. According to the same procedure as formula 1 in step 202, the frequency response characteristic curve at the plane of the sound source speaker is deduced inversely, as shown in FIG. 7 .

Step 203, acquiring the frequency response characteristic curve of the sound source speaker at the front end of the vehicle.

Embed the sound source speaker into the cabinet and isolate its front and rear diaphragms. Place the test vehicle in the semi-anechoic chamber of the whole vehicle, and the front end of the vehicle is more than 3m away from the sharp edge of the wall of the anechoic chamber. Install a sound source speaker with a box at the original installation position of the pedestrian warning device at the front of the vehicle, and the direction of the speaker is consistent with the direction of the warning device speaker. Install a microphone at the designated measuring point outside the vehicle, and connect the microphone to the test front end. The test front-end analysis frequency bandwidth is set to 20480Hz. Calibrate the microphone with a calibration device. The white noise signal is used as the excitation signal of the speaker, and the voltage is adjusted so that the voltage at both ends of the speaker is consistent with that in step 203 .

Start the equipment to collect the sound, the collection time is 20s, repeat the measurement for each test no less than 3 times, take the average value of the results, analyze the data in the FFT frequency domain, the frequency resolution is 2Hz, and obtain the sound source loudspeaker at the front end of the vehicle The frequency response characteristic curve is shown in Figure 8.

Step 204, through the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker, and the frequency response characteristic curve at the front end of the vehicle of the sound source speaker to obtain a synthesis Transfer Function.

Through the frequency response characteristic function of the white noise signal, the frequency response characteristic function at the plane of the pedestrian warning speaker, the frequency response characteristic function at the plane of the sound source speaker and the frequency response characteristic function of the sound source speaker at the front end of the vehicle, the synthesis is obtained by formula (2) Transfer Function:

Among them: B is the frequency response characteristic function at the plane of the pedestrian warning speaker, A ₀ is the frequency response characteristic function of the white noise signal, E is the frequency response characteristic function of the sound source speaker at the front end of the vehicle, and D is the frequency at the sound source speaker plane Response characteristic function, Y is the comprehensive transfer function.

The integrated transfer function curve is obtained through the integrated transfer function, as shown in Fig. 9 .

Step 205: Obtain the subjective output sound source material, and obtain the frequency response characteristic function of the subjective output sound source material through the subjective output sound source material.

Organize a subjective evaluation team to perform subjective evaluation on a given number of sound samples. In the sound subjective evaluation laboratory, the audio high-fidelity playback equipment is used to play back several groups of pedestrian warning sound samples, and the team members make subjective evaluation of the sound. The sound material evaluated is scored according to the degree of pleasing sound. Finally, the average score of each sound material is calculated, and the sound material with the highest average score is selected as the subjective output sound source material.

Taking the subjective output audio source material selected by subjective evaluation as the output signal, FFT frequency domain analysis is performed on it, and the frequency resolution is 2Hz, and the frequency response characteristic curve of the subjective output audio source material is obtained, as shown in Figure 10. Through the subjective output audio source material frequency The response characteristic curve obtains the frequency response characteristic function of the subjective output sound source material.

Step 206, obtaining the subjective input sound source through the frequency response characteristic function and the comprehensive transfer function of the subjective output sound source material;

Obtain subjective input sound source function by formula (3) by described subjective output sound source material frequency response characteristic function and comprehensive transfer function:

Step 207. Obtain a corrected version of the input sound source through the subjective input sound source and the integrated transfer function.

The subjective input sound source is used as the target sound source, and the subjective output sound source material is corrected and edited using sound editing software, so that its frequency spectrum and sound pressure level are consistent with the subjective input sound source, so as to obtain the corrected version of the output sound source material, and the corrected version of the output sound source material is corrected Figure 11 shows the frequency response characteristic curve of the output sound source material of the version, as shown in Figure 11; the frequency response characteristic function of the output sound source material of the corrected version is obtained through the frequency response characteristic curve of the output sound source material of the corrected version, and the frequency response characteristic function and the comprehensive transfer function of the output sound source material are obtained through the corrected version The corrected version of the input sound source function is obtained by formula (3), and the corrected version of the input sound source frequency response characteristic curve of the corrected version of the input sound source function, as shown in Figure 12, the corrected version of the input sound source is obtained through the corrected version of the input sound source function.

Step 208: Obtain a revised version of the input sound source through the corrected version of the input sound source and the subjective output sound source material.

The frequency response characteristic curve at the vehicle front end of the corrected version of the input sound source pedestrian warning speaker is obtained through the corrected version of the input sound source, and the specific content is as follows:

Store the modified input signal G in the pedestrian alarm assembly, drive it to sound, and test the sound at a fixed measuring point outside the vehicle. The test front-end analysis frequency bandwidth is set to 20480Hz, and the acquisition time is 20s. Repeat the measurement for each test no less than 3 times, take the average value of the results, and analyze the data in the FFT frequency domain with a frequency resolution of 2 Hz to obtain the frequency response characteristic curve of the corrected version of the input sound source pedestrian warning speaker at the front of the vehicle.

The corrected version of the input sound source is obtained through the frequency response characteristic curve of the corrected version of the input sound source pedestrian warning speaker at the front end of the vehicle and the subjective output sound source material. The specific content is as follows:

Compare the frequency response characteristic curve of the corrected version of the input sound source pedestrian warning speaker at the front end of the vehicle obtained from the test with the frequency response characteristic curve of the subjective output sound source material, and compare the difference frequency points and amplitudes of the two curves. According to the comparison results, use sound software to fine-tune the target sound source until the difference between the two curves meets the requirements. Through fine-tuning, the subjective output sound source material is obtained to obtain a revised version of the input sound source.

The present invention can predict the sound pressure level and spectrum change of the low-speed pedestrian prompting sound in advance by measuring the frequency response characteristics of the electric vehicle low-speed pedestrian prompting sound system and the transfer function on the transmission path, so that the sound source can be adjusted in advance. Compensate for pressure level and spectrum changes, so as to solve the problem of distorted prompts heard by pedestrians.

In an exemplary embodiment, there is also provided a design system for low-speed pedestrian warning sound of electric vehicles, as shown in FIG. 13 , the design system includes:

The obtaining module 310 is used to separately obtain the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker, and the frequency response characteristic curve at the vehicle front end of the sound source speaker ;

The fitting module 320 is the same as passing through the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker, and the frequency response at the front end of the sound source speaker The characteristic curve obtains the comprehensive transfer function;

The analysis module 330 is used to acquire subjective output sound source material, and obtain subjective input sound source through the subjective output sound source material and the comprehensive transfer function.

A correction module 340, configured to obtain a corrected version of the input sound source through the subjective input sound source and the integrated transfer function.

Embodiment four

FIG. 14 is a structural block diagram of a terminal provided by an embodiment of the present application, and the terminal may be the terminal in the foregoing embodiment. The terminal 400 may be a portable mobile terminal, such as a smart phone or a tablet computer. The terminal 400 may also be called user equipment, portable terminal and other names.

Generally, the terminal 400 includes: a processor 401 and a memory 402 .

The processor 401 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and the like. Processor 401 can adopt at least one hardware form in DSP (Digital Signal Processing, digital signal processing), FPGA (Field-Programmable Gate Array, field programmable gate array), PLA (Programmable Logic Array, programmable logic array) accomplish. Processor 401 may also include a main processor and a coprocessor, and the main processor is a processor for processing data in a wake-up state, also known as a CPU (Central Processing Unit, central processing unit); the coprocessor is Low-power processor for processing data in standby state. In some embodiments, the processor 401 may be integrated with a GPU (Graphics Processing Unit, image processor), and the GPU is used for rendering and drawing the content that needs to be displayed on the display screen. In some embodiments, the processor 401 may also include an AI (Artificial Intelligence, artificial intelligence) processor, where the AI processor is used to process computing operations related to machine learning.

Memory 402 may include one or more computer-readable storage media, which may be tangible and non-transitory. The memory 402 may also include high-speed random access memory and non-volatile memory, such as one or more magnetic disk storage devices and flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory 402 is used to store at least one instruction, and the at least one instruction is used to be executed by the processor 401 to realize a low-speed electric vehicle provided in this application. Pedestrian alert sound design system.

In some embodiments, the terminal 400 may optionally further include: a peripheral device interface 403 and at least one peripheral device. Specifically, the peripheral device includes: at least one of a radio frequency circuit 404 , a touch screen 405 , a camera 406 , an audio circuit 407 , a positioning component 408 and a power supply 409 .

The peripheral device interface 403 may be used to connect at least one peripheral device related to I/O (Input/Output, input/output) to the processor 401 and the memory 402 . In some embodiments, the processor 401, memory 402 and peripheral device interface 403 are integrated on the same chip or circuit board; in some other embodiments, any one of the processor 401, memory 402 and peripheral device interface 403 or The two can be implemented on a separate chip or circuit board, which is not limited in this embodiment.

The radio frequency circuit 404 is used to receive and transmit RF (Radio Frequency, radio frequency) signals, also called electromagnetic signals. The radio frequency circuit 404 communicates with the communication network and other communication devices through electromagnetic signals. The radio frequency circuit 404 converts electrical signals into electromagnetic signals for transmission, or converts received electromagnetic signals into electrical signals. Optionally, the radio frequency circuit 404 includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a subscriber identity module card, and the like. The radio frequency circuit 404 can communicate with other terminals through at least one wireless communication protocol. The wireless communication protocol includes but is not limited to: World Wide Web, Metropolitan Area Network, Intranet, various generations of mobile communication networks (2G, 3G, 4G and 5G), wireless local area network and/or WiFi (Wireless Fidelity, Wireless Fidelity) network. In some embodiments, the radio frequency circuit 404 may also include circuits related to NFC (Near Field Communication, short-range wireless communication), which is not limited in this application.

The touch screen 405 is used to display a UI (User Interface, user interface). The UI can include graphics, text, icons, video, and any combination thereof. The touch display 405 also has the ability to collect touch signals on or over the surface of the touch display 405 . The touch signal can be input to the processor 401 as a control signal for processing. The touch screen 405 is used to provide virtual buttons and/or virtual keyboards, also called soft buttons and/or soft keyboards. In some embodiments, there may be one touch screen 405, which is set on the front panel of the terminal 400; in other embodiments, there may be at least two touch screens 405, which are respectively set on different surfaces of the terminal 400 or in a folding design In some other embodiments, the touch display screen 405 may be a flexible display screen, which is arranged on the curved surface or the folding surface of the terminal 400 . Even, the touch display screen 405 can also be set as a non-rectangular irregular figure, that is, a special-shaped screen. The touch display screen 405 can be made of LCD (Liquid Crystal Display, liquid crystal display), OLED (Organic Light-Emitting Diode, organic light-emitting diode) and other materials.

The camera assembly 406 is used to capture images or videos. Optionally, the camera component 406 includes a front camera and a rear camera. Usually, the front camera is used for video calling or taking selfies, and the rear camera is used for taking photos or videos. In some embodiments, there are at least two rear cameras, which are any one of the main camera, depth-of-field camera, and wide-angle camera respectively, so as to realize the fusion of the main camera and the depth-of-field camera to realize the background blur function, and the fusion of the main camera and the wide-angle camera Realize panoramic shooting and VR (Virtual Reality, virtual reality) shooting functions. In some embodiments, camera assembly 406 may also include a flash. The flash can be a single-color temperature flash or a dual-color temperature flash. Dual color temperature flash refers to the combination of warm light flash and cold light flash, which can be used for light compensation under different color temperatures.

The audio circuit 407 is used to provide an audio interface between the user and the terminal 400 . Audio circuitry 407 may include a microphone and speakers. The microphone is used to collect sound waves of the user and the environment, and convert the sound waves into electrical signals and input them to the processor 401 for processing, or input them to the radio frequency circuit 404 to realize voice communication. For the purpose of stereo acquisition or noise reduction, there may be multiple microphones, which are respectively arranged at different parts of the terminal 400 . The microphone can also be an array microphone or an omnidirectional collection microphone. The speaker is used to convert the electrical signal from the processor 401 or the radio frequency circuit 404 into sound waves. The loudspeaker can be a conventional membrane loudspeaker or a piezoelectric ceramic loudspeaker. When the speaker is a piezoelectric ceramic speaker, it is possible not only to convert electrical signals into sound waves audible to humans, but also to convert electrical signals into sound waves inaudible to humans for purposes such as distance measurement. In some embodiments, audio circuitry 407 may also include a headphone jack.

The positioning component 408 is used to locate the current geographic location of the terminal 400 to implement navigation or LBS (Location Based Service, location-based service). The positioning component 408 may be a positioning component based on the GPS (Global Positioning System, Global Positioning System) of the United States, the Beidou system of China or the Galileo system of Russia.

The power supply 409 is used to supply power to various components in the terminal 400 . Power source 409 may be AC, DC, disposable or rechargeable batteries. When the power source 409 includes a rechargeable battery, the rechargeable battery may be a wired rechargeable battery or a wireless rechargeable battery. A wired rechargeable battery is a battery charged through a wired line, and a wireless rechargeable battery is a battery charged through a wireless coil. The rechargeable battery can also be used to support fast charging technology.

In some embodiments, the terminal 400 further includes one or more sensors 410 . The one or more sensors 410 include, but are not limited to: an acceleration sensor 411 , a gyro sensor 412 , a pressure sensor 413 , a fingerprint sensor 414 , an optical sensor 415 and a proximity sensor 416 .

The acceleration sensor 411 can detect the acceleration on the three coordinate axes of the coordinate system established by the terminal 400 . For example, the acceleration sensor 411 can be used to detect the components of the gravitational acceleration on the three coordinate axes. The processor 401 may control the touch display screen 405 to display the user interface in a landscape view or a portrait view according to the gravitational acceleration signal collected by the acceleration sensor 411 . The acceleration sensor 411 can also be used for collecting game or user's motion data.

The gyro sensor 412 can detect the body direction and rotation angle of the terminal 400, and the gyro sensor 412 can cooperate with the acceleration sensor 411 to collect 3D (3 Dimensions, three-dimensional) actions of the user on the terminal 400. According to the data collected by the gyroscope sensor 412, the processor 401 can realize the following functions: motion sensing (such as changing the UI according to the user's tilt operation), image stabilization during shooting, game control and inertial navigation.

The pressure sensor 413 may be disposed on a side frame of the terminal 400 and/or a lower layer of the touch display screen 405 . When the pressure sensor 413 is arranged on the side frame of the terminal 400, it can detect the user's grip signal on the terminal 400, and perform left and right hand recognition or shortcut operation according to the grip signal. When the pressure sensor 413 is disposed on the lower layer of the touch display screen 405 , it can control the operable controls on the UI interface according to the user's pressure operation on the touch display screen 405 . The operable controls include at least one of button controls, scroll bar controls, icon controls, and menu controls.

The fingerprint sensor 414 is used to collect the user's fingerprint, so as to identify the identity of the user according to the collected fingerprint. When the identity of the user is recognized as a trusted identity, the processor 401 authorizes the user to perform related sensitive operations, such sensitive operations include unlocking the screen, viewing encrypted information, downloading software, making payment, and changing settings. The fingerprint sensor 414 may be provided on the front, back or side of the terminal 400 . When the terminal 400 is provided with a physical button or a manufacturer's Logo, the fingerprint sensor 414 may be integrated with the physical button or the manufacturer's Logo.

The optical sensor 415 is used to collect ambient light intensity. In one embodiment, the processor 401 can control the display brightness of the touch screen 405 according to the ambient light intensity collected by the optical sensor 415 . Specifically, when the ambient light intensity is high, the display brightness of the touch screen 405 is increased; when the ambient light intensity is low, the display brightness of the touch screen 405 is decreased. In another embodiment, the processor 401 may also dynamically adjust shooting parameters of the camera assembly 406 according to the ambient light intensity collected by the optical sensor 415 .

The proximity sensor 416 , also called a distance sensor, is usually arranged on the front of the terminal 400 . The proximity sensor 416 is used to collect the distance between the user and the front of the terminal 400 . In one embodiment, when the proximity sensor 416 detects that the distance between the user and the front of the terminal 400 gradually decreases, the processor 401 controls the touch display screen 405 to switch from the bright screen state to the off-screen state; when the proximity sensor 416 detects When the distance between the user and the front of the terminal 400 gradually increases, the processor 401 controls the touch display screen 405 to switch from the off-screen state to the on-screen state.

Those skilled in the art can understand that the structure shown in FIG. 14 does not constitute a limitation on the terminal 400, and may include more or less components than shown in the figure, or combine certain components, or adopt different component arrangements.

Embodiment five

In an exemplary embodiment, a computer-readable storage medium is also provided, on which a computer program is stored. When the program is executed by a processor, a low-speed pedestrian warning sound for an electric vehicle as provided in all invention embodiments of the present application is provided. design system.

Any combination of one or more computer readable medium(s) may be utilized. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination thereof. More specific examples (non-exhaustive list) of computer readable storage media include: electrical connections with one or more leads, portable computer disks, hard disks, random access memory (RAM), read only memory (ROM), Erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

A computer readable signal medium may include a data signal carrying computer readable program code in baseband or as part of a carrier wave. Such propagated data signals may take many forms, including - but not limited to - electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. .

Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including - but not limited to - wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Computer program code for carrying out the operations of the present invention may be written in one or more programming languages, or combinations thereof, including object-oriented programming languages—such as Java, Smalltalk, C++, and conventional Procedural Programming Language - such as "C" or a similar programming language. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In cases involving a remote computer, the remote computer can be connected to the user computer through any kind of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (such as through an Internet service provider). Internet connection).

Embodiment six

In an exemplary embodiment, an application program product is also provided, including one or more instructions, which can be executed by the processor 401 of the above-mentioned device to complete the above-mentioned low-speed pedestrian warning sound for electric vehicles. design system.

Although embodiments of the present invention have been disclosed above, it is not limited to the applications set forth in the specification and examples. It can be fully applied to various fields suitable for the present invention. Additional modifications can readily be made by those skilled in the art. Therefore, the invention should not be limited to the specific details and examples shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims

A method for designing low-speed pedestrian prompting sounds for electric vehicles, characterized in that it includes:

Obtaining the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker, and the frequency response characteristic curve at the vehicle front end of the sound source speaker;

A comprehensive transfer function is obtained through the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker, and the frequency response characteristic curve at the vehicle front end of the sound source speaker;

Obtaining the subjective output sound source material, obtaining the subjective input sound source through the subjective output sound source material and the comprehensive transfer function;

A corrected version of the input sound source is obtained through the subjective input sound source and the integrated transfer function.
A kind of electric vehicle low-speed pedestrian sound design method according to claim 1, is characterized in that, also comprises:

The frequency response characteristic curve of the corrected version of the input sound source pedestrian warning speaker at the front end of the vehicle is obtained through the corrected version of the input sound source, and the corrected version of the input sound source is obtained through the corrected version of the frequency response characteristic curve of the input sound source pedestrian warning speaker at the vehicle front end and the subjective output sound source material .
A kind of electric vehicle low-speed pedestrian prompt sound design method according to claim 1, it is characterized in that, described acquisition subjective output sound source material, obtain subjective input sound source through described subjective output sound source material and integrated transfer function, comprise:

Obtain subjective output audio material;

Obtaining the frequency response characteristic function of the subjective output sound source material through the subjective output sound source material;

The subjective input sound source is obtained through the frequency response characteristic function of the subjective output sound source material and the comprehensive transfer function.
According to claim 1, a method for designing a notification sound for low-speed pedestrians in an electric vehicle, wherein said obtaining a corrected version of the input sound source through said subjective input sound source and a comprehensive transfer function includes:

Obtaining a corrected version of the output sound source material through the subjective input sound source and the subjective output sound source material;

A corrected version of the input sound source is obtained through the corrected version of the output sound source material and the integrated transfer function.
A kind of electric vehicle low-speed pedestrian prompt sound design method according to claim 1, it is characterized in that, described through the frequency response characteristic curve of described white noise signal, the frequency response characteristic curve at the plane of pedestrian warning loudspeaker, sound source loudspeaker The frequency response characteristic curve at the plane and the frequency response characteristic curve of the sound source loudspeaker at the vehicle front end result in a composite transfer function consisting of:

The white noise signal is obtained respectively by the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker and the frequency response characteristic curve at the front end of the sound source speaker vehicle The frequency response characteristic function of the frequency response characteristic function of the pedestrian warning speaker plane, the frequency response characteristic function of the sound source speaker plane and the frequency response characteristic function of the sound source speaker vehicle front end;

Through the frequency response characteristic function of the white noise signal, the frequency response characteristic function at the plane of the pedestrian warning speaker, the frequency response characteristic function at the plane of the sound source speaker, and the frequency response characteristic function of the sound source speaker at the front end of the vehicle, the synthesis is obtained by formula (1) Transfer Function:

Among them: B is the frequency response characteristic function at the plane of the pedestrian warning speaker, A 0 is the frequency response characteristic function of the white noise signal, E is the frequency response characteristic function of the sound source speaker at the front end of the vehicle, and D is the frequency at the sound source speaker plane Response characteristic function, Y is the comprehensive transfer function.
A kind of electric vehicle low-speed pedestrian prompt sound design method according to claim 3, is characterized in that, said obtain the frequency response characteristic function of subjective output sound source material through described subjective output sound source material, comprising:

Obtaining the frequency response characteristic curve of the subjective output sound source material through the subjective output sound source material;

Obtaining the frequency response characteristic function of the subjective output sound source material through the subjective output sound source material frequency response characteristic curve;

Obtain subjective input sound source function by formula (2) by described subjective output sound source material frequency response characteristic function and comprehensive transfer function:

Among them, G is the subjective input sound source function, and F is the frequency response characteristic function of the subjective output sound source material;

The subjective input sound source is obtained through the subjective input sound source function.
According to claim 4, a method for designing a notification sound for low-speed pedestrians in an electric vehicle, wherein the input sound source of the corrected version is obtained through the output sound source material of the corrected version and the comprehensive transfer function, including:

Obtaining the frequency response characteristic curve of the output sound source material of the corrected version through the output sound source material of the corrected version;

Obtain the frequency response characteristic function of the output sound source material of the corrected version through the frequency response characteristic curve of the output sound source material of the corrected version;

The corrected version of the input sound source function is obtained through the corrected version of the frequency response characteristic function of the output sound source material and the integrated transfer function;

The corrected version of the input sound source is obtained through the corrected version of the input sound source function.
A low-speed pedestrian alert sound design system for electric vehicles, characterized in that the design system includes:

The acquisition module is used to respectively acquire the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker, and the frequency response characteristic curve at the vehicle front end of the sound source speaker;

The fitting module is the same as passing through the frequency response characteristic curve of the white noise signal, the frequency response characteristic curve at the plane of the pedestrian warning speaker, the frequency response characteristic curve at the plane of the sound source speaker, and the frequency response characteristic at the vehicle front end of the sound source speaker The curve gets the comprehensive transfer function;

The analysis module is used to obtain the subjective output sound source material, and obtain the subjective input sound source through the subjective output sound source material and the comprehensive transfer function.

The correction module is used to obtain a corrected version of the input sound source through the subjective input sound source and the comprehensive transfer function.
A terminal, characterized in that, comprising:

one or more processors;

memory for storing said one or more processor-executable instructions;

Wherein, the one or more processors are configured to:

Executing a method for designing a warning sound for low-speed pedestrians in electric vehicles as described in any one of claims 1 to 5.
A non-transitory computer-readable storage medium, characterized in that when the instructions in the storage medium are executed by the processor of the terminal, the terminal can execute an electric vehicle according to any one of claims 1 to 5 Design method of warning sound for low-speed pedestrians.