Engine sound extraction method and system for active sound of electric vehicle

Abstract

The invention belongs to the field of engine sound extraction, particularly relates to an engine sound extraction method and system for active sound of an electric vehicle, and aims to solve the problem of low authenticity of synthesized engine sound caused by inconvenience in extraction and analysis of real-time working condition parameters of an engine in the existing engine sound extraction process. According to the scheme, the method comprises the following steps that S1, real engine sound is collected, and collected data are processed; s2, marking the collected data, decomposing an original engine sound signal, and establishing a sound sample database; s3, processing and perfecting each sound fragment sample; s4, sound samples corresponding to different working conditions of the vehicle are taken out to be synthesized, and synthesized audios are recorded; in the using process, the real-time working condition parameters of the engine can be conveniently extracted and analyzed, and therefore the authenticity of the synthesized engine sound can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of engine sound extraction technology, and in particular to a method and system for extracting engine sound for active engine noise in electric vehicles. Background Technology

[0002] Currently, pure electric vehicles are flooding the market, with drive motors replacing traditional engines, resulting in a reduction in overall vehicle noise. However, the relatively quiet interior of pure electric vehicles makes it difficult to provide drivers with auditory feedback reflecting changes in vehicle status. To address this issue, in-vehicle active sound technology has emerged. This technology identifies the vehicle's driving status and simulates engine acceleration sounds inside the vehicle to provide driving feedback and enhance the sporty driving experience. The simulated engine acceleration sound technology first requires recording real engine sounds under various operating conditions in a traditional gasoline vehicle as sound samples. Then, based on the vehicle's status (speed, RPM, torque changes, etc.), these samples are synthesized in real time inside the vehicle and played back through the in-vehicle audio system.

[0003] In existing technologies, it is not convenient to extract and analyze the real-time operating parameters of the engine during the engine sound extraction process, resulting in low realism of the synthesized engine sound. To address this issue, we propose a method and system for extracting engine sound for active sound of electric vehicles. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies where the extraction and analysis of real-time engine operating parameters is inconvenient, resulting in low realism of synthesized engine sounds. Therefore, this invention proposes a method and system for extracting engine sounds for active sounds in electric vehicles.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for extracting engine sound for active engine noise in electric vehicles includes the following steps:

[0007] S1: First, collect real engine sounds and process the collected data;

[0008] S2: Mark the collected data, decompose the original engine sound signal and establish a sound sample database;

[0009] S3: Process and refine each audio segment sample;

[0010] S4: Extract sound samples corresponding to different operating conditions of the vehicle, synthesize them, and record the synthesized audio.

[0011] S5: Compare and analyze the recorded audio, and evaluate based on the comparison and analysis results.

[0012] This invention also proposes an engine sound extraction system for active engine noise in electric vehicles, comprising an audio acquisition module and an operating condition acquisition module. The audio acquisition module is connected to a sound signal processing module, which is connected to a marking module. The marking module is connected to a decomposition module, which is connected to a database module and an analysis and adjustment module. The analysis and adjustment module is connected to a statistics module, which is connected to a construction module. The construction module is connected to the database module, which is connected to a processing improvement module. The processing improvement module is connected to a synthesis module, which is connected to a recording module. The recording module is connected to a comparative analysis module, which is connected to a simulation verification module. The simulation verification module is connected to an evaluation module, the operating condition acquisition module is connected to a classification module, which is connected to an extraction module. The extraction module is connected to a transmission module, which is connected to the synthesis module.

[0013] Preferably, the marking module includes a marking index number unit, a sampling point marking unit, and a speed range marking unit, wherein the marking index number unit is connected to the sampling point marking unit, and the sampling point marking unit is connected to the speed range marking unit.

[0014] Preferably, the operating condition acquisition module includes an acceleration state parameter acquisition unit, a deceleration state parameter acquisition unit, and a constant speed state parameter acquisition unit. The acceleration state parameter acquisition unit is connected to the deceleration state parameter acquisition unit, and the deceleration state parameter acquisition unit is connected to the constant speed state parameter acquisition unit.

[0015] Preferably, the operating condition acquisition module is used to acquire three operating condition data for different types of engines, and the acquired data is classified by the classification module.

[0016] Preferably, the audio acquisition module is used to perform order analysis and data acquisition on the engine sound signal, as a raw engine sound sample for active sound waves.

[0017] Preferably, the audio acquisition module includes a noise reduction processing unit, an engine parameter recording unit, and an engine sound acquisition unit, wherein the noise reduction processing unit is connected to the engine parameter recording unit, and the engine parameter recording unit is connected to the engine sound acquisition unit.

[0018] Preferably, the analysis and adjustment module includes an extraction unit, a frequency characteristic analysis unit, and an amplitude characteristic analysis unit, wherein the extraction unit is connected to the frequency characteristic analysis unit, and the frequency characteristic analysis unit is connected to the amplitude characteristic analysis unit.

[0019] The beneficial effects of the engine sound extraction method and system for active sound generation in electric vehicles described in this invention are as follows:

[0020] 1. This solution, through the setting of the operating condition acquisition module, can collect data on different types of engines and three operating conditions of the engines, and through the classification module, classify and analyze the collected data, thereby improving the accuracy of engine sound synthesis.

[0021] 2. This solution, through the setting of the audio acquisition module, can perform order analysis and data acquisition of engine sound signals, which can be used as the original engine sound sample for active sound waves. Furthermore, the acquisition sound signal can be labeled and processed through the labeling module, which facilitates subsequent processing.

[0022] 3. This solution, through the setting of the marking module, can mark each sound segment with the corresponding index number, the number of marked sampling points, and the actual speed range corresponding to the marked sound segment, thereby improving the sound segment and facilitating subsequent processing.

[0023] This invention facilitates the extraction and analysis of real-time engine operating parameters during use, thereby effectively improving the realism of the synthesized engine sound. Attached Figure Description

[0024] Figure 1 This is a structural block diagram of an engine sound extraction system for active sound waves in electric vehicles proposed in this invention;

[0025] Figure 2 This is a structural block diagram of an engine sound extraction and adjustment module for an active sound wave system of electric vehicles proposed in this invention.

[0026] Figure 3 This is a structural block diagram of a marking module for an engine sound extraction system for active sound waves in electric vehicles, as proposed in this invention.

[0027] Figure 4 This is a structural block diagram of an audio acquisition module for an active engine sound extraction system for electric vehicles, as proposed in this invention.

[0028] Figure 5 This is a structural block diagram of an engine sound extraction system operating condition acquisition module for active sound waves in electric vehicles, as proposed in this invention. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Example 1

[0031] Reference Figures 1-5 A method for extracting engine sound for active engine noise in electric vehicles includes the following steps:

[0032] S1: First, collect real engine sounds and process the collected data;

[0033] S2: Mark the collected data, decompose the original engine sound signal and establish a sound sample database;

[0034] S3: Process and refine each audio segment sample;

[0035] S4: Extract sound samples corresponding to different operating conditions of the vehicle, synthesize them, and record the synthesized audio.

[0036] S5: Compare and analyze the recorded audio, and evaluate based on the comparison and analysis results.

[0037] This embodiment also proposes an engine sound extraction system for active engine sound in electric vehicles, including an audio acquisition module and a working condition acquisition module. The audio acquisition module is connected to a sound signal processing module, which performs order analysis on the sound signal. The sound signal processing module is connected to a marking module, which is connected to a decomposition module. The decomposition module is connected to a database module and an analysis and adjustment module. The analysis and adjustment module is connected to a statistics module, which is connected to a construction module. The construction module is connected to the database module, which is connected to a processing and improvement module. The processing and improvement module is connected to a synthesis module, which is connected to a recording module. The recording module is connected to a comparison and analysis module, which is connected to a simulation verification module. The simulation verification module is connected to an evaluation module. The working condition acquisition module is connected to a classification module, which is connected to an extraction module. The extraction module is connected to a transmission module, which is connected to the synthesis module. The audio acquisition module performs order analysis and data acquisition on the engine sound signal, providing the original engine sound sample for active engine sound. The working condition acquisition module collects three working condition data for different types of engines and classifies the collected data through the classification module. The mathematical model for the order sound is as follows:

[0038] For a traditional engine, a complete power stroke consists of four strokes. Each cylinder completes one power cycle through "intake, compression, power, and exhaust," and the crankshaft rotates twice. When the engine speed is ne, the corresponding fundamental frequency f1 of the engine sound is:

[0039]

[0040] The engine ignition frequency fe is:

[0041]

[0042] In the formula: ne is the engine speed per minute, Nc is the number of engine cylinders, and engine sound is a rather complex signal generated by multiple sound sources in the engine compartment. Car engine sound can be divided into deterministic order sounds and random broadband engine sounds. In the time domain, the expression for the engine order sound in the continuous-time signal xk(t) is:

[0043]

[0044] In the formula: Ak(t) and φk(t) are the harmonic amplitude and initial phase, respectively, and ωk(n) is the random signal component.

[0045] Reference Figure 2 The analysis and adjustment module includes an extraction unit, a frequency response analysis unit, and an amplitude response analysis unit. The extraction unit is connected to the frequency response analysis unit, and the frequency response analysis unit is connected to the amplitude response analysis unit.

[0046] Reference Figure 3 The marking module includes a marking index number unit, a sampling point marking unit, and a speed range marking unit. The marking index number unit is connected to the sampling point marking unit, and the sampling point marking unit is connected to the speed range marking unit. The marking module can mark each sound segment with a corresponding index number, the number of sampling points, and the actual speed range corresponding to the sound segment, thereby improving the sound segment and facilitating subsequent processing.

[0047] Reference Figure 4 The audio acquisition module includes a noise reduction processing unit, an engine parameter recording unit, and an engine sound acquisition unit. The noise reduction processing unit is connected to the engine parameter recording unit, and the engine parameter recording unit is connected to the engine sound acquisition unit. The audio acquisition module can perform order analysis and data acquisition on the engine sound signal, which serves as the original engine sound sample for active sound waves. The acquired sound signal can also be marked by the marking module for easy subsequent processing.

[0048] Reference Figure 5 The operating condition acquisition module includes an acceleration state parameter acquisition unit, a deceleration state parameter acquisition unit, and a constant speed state parameter acquisition unit. The acceleration state parameter acquisition unit is connected to the deceleration state parameter acquisition unit, and the deceleration state parameter acquisition unit is connected to the constant speed state parameter acquisition unit. The operating condition acquisition module can acquire data on different types of engines and the three operating conditions of the engine. The acquired data is then classified and analyzed by the classification module, which improves the accuracy of engine sound synthesis.

[0049] In this embodiment, during use, the actual engine sound is acquired through an audio acquisition module and a working condition acquisition module. The acquired data is processed by a sound signal processing module, and the acquired data is marked by a marking module. The original engine sound signal is decomposed by a decomposition module, and the analysis and adjustment module analyzes and adjusts the main frequency according to the target characteristics, as well as processes the amplitude of the adjusted changes. Then, the sound samples are built and stored in the database module through a construction module, and each sound segment sample is processed and improved by a processing and improvement module. The extraction module can extract the sound samples corresponding to different vehicle working conditions and transmit them to the synthesis module for synthesis through a transmission module. The recording module can record the synthesized audio and compare and analyze the recorded audio. Finally, the simulation verification module performs simulation and verification, and the evaluation module evaluates the simulated and verified sound samples.

[0050] Example 2

[0051] The difference between this embodiment and Embodiment 1 is that the simulation verification module is connected to a compensation module, which includes a monitoring unit and a dynamic adjustment unit. The monitoring unit can monitor the vehicle speed in real time, and the dynamic adjustment unit can adjust the volume and loudness according to the real-time vehicle speed, thereby further improving the realism of the engine sound.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for extracting engine sound for active engine noise in electric vehicles, characterized in that, Includes the following steps: S1: First, collect real engine sounds and process the collected data; S2: Mark the collected data, decompose the original engine sound signal and establish a sound sample database; S3: Process and refine each audio segment sample; S4: Extract sound samples corresponding to different operating conditions of the vehicle, synthesize them, and record the synthesized audio. S5: Compare and analyze the recorded audio, and evaluate based on the comparison and analysis results.

2. A system for extracting engine sound for active engine noise in electric vehicles, comprising an audio acquisition module and a working condition acquisition module, characterized in that, The audio acquisition module is connected to a sound signal processing module, which in turn is connected to a tagging module. The tagging module is connected to a decomposition module, which is connected to a database module and an analysis and adjustment module. The analysis and adjustment module is connected to a statistics module, which is connected to a construction module. The construction module is connected to the database module, which is connected to a processing and improvement module. The processing and improvement module is connected to a synthesis module, which is connected to a recording module. The recording module is connected to a comparative analysis module, which is connected to a simulation verification module. The simulation verification module is connected to an evaluation module. The operating condition acquisition module is connected to a classification module, which is connected to an extraction module. The extraction module is connected to a transmission module, which is connected to the synthesis module.

3. The engine sound extraction system for active sound generation in electric vehicles according to claim 2, characterized in that, The analysis and adjustment module includes an extraction unit, a frequency characteristic analysis unit, and an amplitude characteristic analysis unit. The extraction unit is connected to the frequency characteristic analysis unit, and the frequency characteristic analysis unit is connected to the amplitude characteristic analysis unit.

4. The engine sound extraction system for active sound generation in electric vehicles according to claim 3, characterized in that, The marking module includes a marking index number unit, a sampling point marking unit, and a speed range marking unit. The marking index number unit is connected to the sampling point marking unit, and the sampling point marking unit is connected to the speed range marking unit.

5. The engine sound extraction system for active sound generation in electric vehicles according to claim 4, characterized in that, The audio acquisition module includes a noise reduction processing unit, an engine parameter recording unit, and an engine sound acquisition unit. The noise reduction processing unit is connected to the engine parameter recording unit, and the engine parameter recording unit is connected to the engine sound acquisition unit.

6. The engine sound extraction system for active sound generation in electric vehicles according to claim 5, characterized in that, The operating condition acquisition module includes an acceleration state parameter acquisition unit, a deceleration state parameter acquisition unit, and a constant speed state parameter acquisition unit. The acceleration state parameter acquisition unit is connected to the deceleration state parameter acquisition unit, and the deceleration state parameter acquisition unit is connected to the constant speed state parameter acquisition unit.

7. The engine sound extraction system for active sound generation in electric vehicles according to claim 6, characterized in that, The audio acquisition module is used to perform order analysis and data acquisition on the engine sound signal, serving as the original engine sound sample for active sound waves.

8. The engine sound extraction system for active sound generation in electric vehicles according to claim 7, characterized in that, The operating condition acquisition module is used to collect three operating condition data for different types of engines, and the collected data is classified by the classification module.

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