A method, system, medium, and device for improving the quality of simulated car engine sound.

Abstract

This invention relates to a method, system, medium, and device for improving the sound quality of simulated automotive engine sounds, belonging to the field of engine sound simulation technology. The method specifically includes: constructing an automotive engine sound model based on operating condition data; obtaining a first engine sound sample by processing real engine sound samples; obtaining a second engine sound sample by combining the first engine sound sample with the automotive engine sound model; creating sample labels for the second engine sound sample based on operating condition data; associating the sample labels with engine speed to obtain a simulated engine sound sample library; obtaining a simulated engine speed through a speed conversion model based on real-time driving information; obtaining the corresponding second engine sound sample by associating the simulated engine speed with the sample labels; and obtaining a simulated engine sound signal through signal superposition and attenuation models based on the second engine sound sample. This achieves sound quality optimization of simulated automotive engine sounds, improving the experience for passengers inside the vehicle.

Description

Technical Field

[0001] This invention belongs to the field of automotive engine sound simulation technology, specifically relating to a method, system, medium, and device for improving the quality of simulated automotive engine sound. Background Technology

[0002] As governments and people around the world become increasingly aware of environmental protection, new energy vehicles are gradually becoming the new favorites in the automotive market. Compared with traditional fuel vehicles, the NVH performance of new energy vehicles has changed. Among them, the electric motor in pure electric vehicles has replaced the traditional engine, so the driving noise inside the vehicle is relatively low. Since traditional internal combustion engine vehicles have been in people's lives for many years, drivers and pedestrians are used to the roar of the engine. Drivers can judge the driving status of the vehicle by the sound of the internal combustion engine, and pedestrians can judge the current speed and movement trend of the vehicle by the sound to judge the safe distance between the vehicle and themselves.

[0003] Although pure electric vehicles have significant advantages in energy conservation and environmental protection compared to traditional gasoline vehicles, the lack of engine noise still poses a concern. On the one hand, because the drive system of pure electric vehicles produces almost no noise outside the vehicle at low speeds, pedestrians, especially visually impaired individuals, have difficulty perceiving the vehicle's driving status using their hearing, increasing the safety hazards of pure electric vehicles at low speeds. On the other hand, the playback system for the simulated engine sound suffers from delays and distortions, affecting the sound quality of the simulated engine sound. The sound quality of the simulated engine sound can also affect the driver's experience and judgment of the vehicle's movement, potentially leading to certain safety hazards. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides a method, system, medium, and device for improving the quality of simulated automotive engine sound. The method involves collecting operating condition data of a gasoline-powered vehicle and corresponding real engine sound samples; constructing an automotive engine sound model based on the operating condition data; obtaining a first engine sound sample from the real engine sound samples through downsampling and low-pass filtering; obtaining a second engine sound sample by combining the first engine sound sample with the automotive engine sound model; creating sample labels for the second engine sound sample based on the operating condition data; associating the sample labels with engine speed; and outputting the simulated engine sound sample as a PCM format WAV file for storage to obtain the simulated engine sound. The sound sample library collects real-time driving information of the target vehicle. Based on the real-time driving information, a speed conversion model is used to obtain the simulated engine speed. The simulated engine speed is associated with sample tags to obtain the corresponding second engine sound sample. The second engine sound sample is then superimposed to obtain the synthesized engine sound signal. The synthesized engine sound signal is then processed by an attenuation model to obtain the simulated engine sound signal. The simulated engine sound signal is then played through a pre-set speaker, which optimizes the sound quality of the simulated car engine sound, improves the experience and comfort of passengers in the car, and also helps the driver and pedestrians on the road to accurately judge the vehicle's driving status, thus improving the safety of the vehicle during driving.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A method for improving the quality of simulated car engine sound includes the following steps:

[0007] S1: Collect operating condition data of the driving status of the fuel vehicle and the real engine sound sample corresponding to the operating condition data. The operating condition data includes engine speed and number of engine cylinders.

[0008] S2: Construct a car engine sound model based on the operating condition data; obtain a first engine sound sample by downsampling and low-pass filtering based on the real engine sound sample; obtain a second engine sound sample by combining the first engine sound sample with the car engine sound model; create sample labels for the second engine sound sample based on the operating condition data; associate the sample labels with the engine speed; and store the simulated engine sound sample as a PCM format WAV file to obtain a simulated engine sound sample library. The sample labels include sound frequency values ​​and engine speed.

[0009] S3: Collect real-time driving information of the target vehicle, including real-time vehicle speed and real-time vehicle deceleration ratio;

[0010] S4: Based on the real-time driving information, a simulated engine speed is obtained through a speed conversion model. The simulated engine speed is associated with the sample label. The corresponding second engine sound sample is called based on the sample label. The speed conversion model is represented as follows:

[0011] Wherein, n represents the simulated engine speed, v represents the real-time vehicle speed, G represents the real-time vehicle reduction ratio, and R represents the tire radius;

[0012] S5: Based on the second engine sound sample, a synthesized engine sound signal is obtained by signal superposition. Based on the synthesized engine sound signal, an analog engine sound signal is obtained by processing the attenuation model. The analog engine sound signal is then played through a preset speaker.

[0013] Preferably, step S2 specifically includes the following steps:

[0014] S201: Based on the aforementioned operating condition data, using the formula... The dominant order frequency is calculated, where f1 represents the dominant order frequency, n1 represents the engine speed, p represents the number of engine cylinders, and t represents the continuous time signal. The order harmonics are obtained based on the dominant order frequency, and the car engine sound model is constructed based on the order harmonics.

[0015] S202: According to the car engine sound model, the first engine sound sample is truncated to the same length to obtain the second engine sound sample, and the sound frequency value and engine speed corresponding to the second engine sound sample are used as the sample label of the second engine sound sample. The second engine sound sample is obtained by adding a fixed sound superposition area data to a multiple of the engine's two cycle data.

[0016] Preferably, step S201 specifically includes the representation of the car engine sound model as follows:

[0017] Where x(t) represents the car engine sound signal, t represents the continuous time signal, k represents the total number of orders of the harmonics, and A i (t) represents the amplitude of the i-th order harmonic. ω represents the initial phase of the i-th harmonic. i (n) represents the random signal component accompanying the i-th order harmonic, where n represents the random signal, f1 i The i-th order represents the frequency of the principal order.

[0018] Preferably, step S5 specifically includes superimposing the signals of two adjacent second engine sound samples according to the simulated engine speed to obtain the synthesized engine sound signal, wherein the synthesized engine sound signal is represented as:

[0019] Where x represents the synthesized engine sound signal, x1 and x2 represent two adjacent second engine sound samples, and A1 and A2 represent the amplitude of the second engine sound signal. and w1 and w2 represent the phase of the second engine sound sample and the angular frequency of the second engine sound sample, respectively.

[0020] Preferably, step S5 further includes the attenuation model expressed as:

[0021] Where di represents the quality factor, f0 represents the center frequency of the band-stop filter, fh represents the upper limit frequency of the band-stop filter, and fl represents the lower limit frequency of the band-stop filter.

[0022] A system for improving the quality of simulated car engine sound includes the following modules:

[0023] The sample library construction module is used to collect operating condition data of the driving state of a fuel vehicle and the corresponding real engine sound samples. The operating condition data includes engine speed and the number of engine cylinders. A car engine sound model is constructed based on the operating condition data. A first engine sound sample is obtained by downsampling and low-pass filtering based on the real engine sound sample. A second engine sound sample is obtained by combining the first engine sound sample with the car engine sound model. Sample tags are created for the second engine sound sample based on the operating condition data, and the sample tags are associated with the engine speed. The simulated engine sound sample is output as a PCM format wav file and stored to obtain a simulated engine sound sample library. The sample tags include sound frequency values ​​and engine speed.

[0024] The data acquisition module is used to collect real-time driving information of the target vehicle, including real-time vehicle speed and real-time vehicle deceleration ratio.

[0025] The data processing module is used to process the real-time driving information through a speed conversion model to obtain the simulated engine speed, associate the sample label with the simulated engine speed, and call the corresponding second engine sound sample according to the sample label;

[0026] The sound quality optimization module is used to obtain a synthesized engine sound signal by superimposing the second engine sound sample, obtain a simulated engine sound signal by processing the synthesized engine sound signal through an attenuation model, and play the simulated engine sound signal through a preset speaker.

[0027] An electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method described above for improving the quality of simulated car engine sound.

[0028] A storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform the aforementioned method for improving the quality of simulated car engine sound.

[0029] The beneficial effects of this invention are as follows:

[0030] 1. The simulated engine speed changes dynamically, so the second engine sound sample is also called according to the simulated engine speed during the execution process, resulting in signal superposition. During the signal superposition process, the peak noise generated by the superposition of sounds at different time frequencies reduces the sound quality of the simulated engine sound, affecting the experience of passengers. To address this, an attenuation model is used to attenuate the synthesized engine sound signal, reducing the distortion of the simulated engine sound caused by the prominent peak noise frequency, optimizing the sound quality of the simulated engine sound, and improving the comfort of passengers.

[0031] 2. Play simulated engine sound signals through preset speakers, including in-vehicle speakers and external speakers. The purpose of the in-vehicle speakers is to play simulated engine sound signals to improve the experience of the people in the vehicle and the driver's ability to judge the vehicle's driving status. The purpose of the external speakers is to remind pedestrians on the road of the current driving status of the vehicle and reduce road safety hazards. Attached Figure Description

[0032] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0033] Figure 1 This is a flowchart illustrating the method for improving the simulated sound quality of a car engine according to the present invention. Detailed Implementation

[0034] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0035] Please see Figure 1A method for improving the quality of simulated car engine sound includes the following steps:

[0036] S1: Collect operating condition data of the driving status of the fuel vehicle and the real engine sound sample corresponding to the operating condition data. The operating condition data includes engine speed and number of engine cylinders.

[0037] S2: Construct a car engine sound model based on the operating condition data; obtain a first engine sound sample by downsampling and low-pass filtering based on the real engine sound sample; obtain a second engine sound sample by combining the first engine sound sample with the car engine sound model; create sample labels for the second engine sound sample based on the operating condition data; associate the sample labels with the engine speed; and store the simulated engine sound sample as a PCM format WAV file to obtain a simulated engine sound sample library. The sample labels include sound frequency values ​​and engine speed.

[0038] S3: Collect real-time driving information of the target vehicle, including real-time vehicle speed and real-time vehicle deceleration ratio;

[0039] S4: Based on the real-time driving information, the simulated engine speed is obtained through the speed conversion model. The simulated engine speed is associated with the sample label. The corresponding second engine sound sample is called based on the sample label.

[0040] S5: Based on the second engine sound sample, a synthesized engine sound signal is obtained by signal superposition. Based on the synthesized engine sound signal, an analog engine sound signal is obtained by processing the attenuation model. The analog engine sound signal is then played through a preset speaker.

[0041] It should be noted that the operating condition data includes idling, acceleration, and deceleration conditions. In the process of collecting real engine sound samples, environmental noise is inevitably included. The collected real engine sound samples are low-pass filtered to avoid frequency aliasing caused by downsampling. In addition, the preset speakers include in-vehicle speakers and external speakers. The purpose of the in-vehicle speakers is to play simulated engine sound signals to improve the experience of the people in the vehicle and the driver's ability to judge the vehicle's driving status. The purpose of the external speakers is to remind pedestrians on the road of the current driving status of the vehicle and reduce road safety hazards.

[0042] Specifically, step S2 includes the following steps:

[0043] S201: Based on the aforementioned operating condition data, using the formula... The dominant order frequency is calculated, where f1 represents the dominant order frequency, n1 represents the engine speed, p represents the number of engine cylinders, and t represents the continuous time signal. The order harmonics are obtained based on the dominant order frequency, and the car engine sound model is constructed based on the order harmonics.

[0044] S202: According to the car engine sound model, the first engine sound sample is truncated to the same length to obtain the second engine sound sample, and the sound frequency value and engine speed corresponding to the second engine sound sample are used as the sample label of the second engine sound sample. The second engine sound sample is obtained by adding a fixed sound superposition area data to a multiple of the engine's two cycle data.

[0045] It should be noted that one ignition cycle of the engine is a period of time. The engine cycle data is the sound sample of the car engine during the period from the start of ignition to the end of ignition. The second engine sound sample is obtained by adding a fixed sound superposition area data to the multiple of the engine cycle data, which is beneficial for the smooth synthesis of sound samples and the continuous stability of the sound synthesis process.

[0046] Specifically, step S201 includes the representation of the car engine sound model as follows:

[0047] Where x(t) represents the car engine sound signal, t represents the continuous time signal, k represents the total number of orders of the harmonics, and A i (t) represents the amplitude of the i-th order harmonic. ω represents the initial phase of the i-th harmonic. i (n) represents the random signal component accompanying the i-th order harmonic, where n represents the random signal, f1 i The i-th order represents the frequency of the principal order.

[0048] Specifically, step S4 includes the speed conversion model being represented as follows:

[0049] Where n represents the simulated engine speed, v represents the real-time vehicle speed, G represents the real-time vehicle reduction ratio, and R represents the tire radius.

[0050] Specifically, S5 includes superimposing the signals of two adjacent second engine sound samples according to the simulated engine speed to obtain the synthesized engine sound signal, which is represented as follows:

[0051] Where x represents the synthesized engine sound signal, x1 and x2 represent two adjacent second engine sound samples, and A1 and A2 represent the amplitude of the second engine sound signal. and w1 and w2 represent the phase of the second engine sound sample and the angular frequency of the second engine sound sample, respectively.

[0052] Specifically, step S5 further includes the attenuation model expressed as:

[0053] Where di represents the quality factor, f0 represents the center frequency of the band-stop filter, fh represents the upper limit frequency of the band-stop filter, and fl represents the lower limit frequency of the band-stop filter.

[0054] It should be further explained that the simulated engine speed changes dynamically, so the second engine sound sample is also called according to the simulated engine speed during the execution process. As a result, there will be signal superposition. During the signal superposition process, the peak noise generated by the superposition of sounds at different time frequencies will reduce the sound quality of the simulated engine sound and affect the experience of passengers. To address this, an attenuation model is used to attenuate the synthesized engine sound signal, which reduces the distortion of the simulated engine sound caused by the prominent peak noise frequency, optimizes the sound quality of the simulated engine sound, and improves the comfort of passengers.

[0055] Furthermore, this application also provides a system for improving the quality of simulated car engine sound, comprising the following modules:

[0056] The sample library construction module is used to collect operating condition data of the driving state of a fuel vehicle and the corresponding real engine sound samples. The operating condition data includes engine speed and the number of engine cylinders. A car engine sound model is constructed based on the operating condition data. A first engine sound sample is obtained by downsampling and low-pass filtering based on the real engine sound sample. A second engine sound sample is obtained by combining the first engine sound sample with the car engine sound model. Sample tags are created for the second engine sound sample based on the operating condition data, and the sample tags are associated with the engine speed. The simulated engine sound sample is output as a PCM format wav file and stored to obtain a simulated engine sound sample library. The sample tags include sound frequency values ​​and engine speed.

[0057] The data acquisition module is used to collect real-time driving information of the target vehicle, including real-time vehicle speed and real-time vehicle deceleration ratio.

[0058] The data processing module is used to process the real-time driving information through a speed conversion model to obtain the simulated engine speed, associate the sample label with the simulated engine speed, and call the corresponding second engine sound sample according to the sample label;

[0059] The sound quality optimization module is used to obtain a synthesized engine sound signal by superimposing the second engine sound sample, obtain a simulated engine sound signal by processing the synthesized engine sound signal through an attenuation model, and play the simulated engine sound signal through a preset speaker.

[0060] Furthermore, this application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-described method for improving the quality of simulated car engine sound.

[0061] Furthermore, this application also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform the above-described method for improving the quality of simulated car engine sound.

[0062] Working principle and usage process of this invention:

[0063] The system collects operating condition data of a gasoline-powered vehicle and corresponding real engine sound samples. Based on the operating condition data, it constructs a vehicle engine sound model. From the real engine sound samples, it performs downsampling and low-pass filtering to obtain the first engine sound sample. Combining the first engine sound sample with the vehicle engine sound model, it obtains the second engine sound sample. Based on the operating condition data, it creates sample labels for the second engine sound sample and associates these labels with engine speed. The simulated engine sound samples are output as PCM format WAV files and stored to create a simulated engine sound sample library. The system also collects real-time driving information of the target vehicle and processes it using a speed conversion model to obtain the simulated engine speed. Based on the simulated engine speed, it associates sample labels and retrieves the corresponding second engine sound sample. Based on the second engine sound sample, it performs signal superposition to obtain a synthesized engine sound signal. Based on the synthesized engine sound signal, it performs attenuation model processing to obtain the simulated engine sound signal, which is then played through a pre-set speaker.

[0064] The computer storage medium of this invention can be any combination of one or more computer-readable media. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: electrical connections having one or more wires, 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 devices, magnetic storage devices, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0065] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0066] The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, etc., or any suitable combination thereof. The computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer can be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for improving the quality of simulated car engine sound, characterized in that, Includes the following steps: S1: Collect operating condition data of the driving status of the fuel vehicle and the real engine sound sample corresponding to the operating condition data. The operating condition data includes engine speed and number of engine cylinders. S2: Construct a car engine sound model based on the operating condition data; obtain a first engine sound sample by downsampling and low-pass filtering based on the real engine sound sample; obtain a second engine sound sample by combining the first engine sound sample with the car engine sound model; create sample labels for the second engine sound sample based on the operating condition data; associate the sample labels with the engine speed; and store the second engine sound sample as a PCM format WAV file to obtain a simulated engine sound sample library. The sample labels include sound frequency values ​​and engine speed. S3: Collect real-time driving information of the target vehicle, including real-time vehicle speed and real-time vehicle deceleration ratio; S4: Based on the real-time driving information, a simulated engine speed is obtained through a speed conversion model. The simulated engine speed is associated with the sample label. The corresponding second engine sound sample is called based on the sample label. The speed conversion model is represented as follows: Where n represents the simulated engine speed, v represents the real-time vehicle speed, G represents the real-time vehicle reduction ratio, and R represents the tire radius; S5: Based on the second engine sound sample, a synthesized engine sound signal is obtained by signal superposition. Based on the synthesized engine sound signal, an analog engine sound signal is obtained by processing the attenuation model. The analog engine sound signal is then played through a preset speaker. Step S2 specifically includes the following steps: S201: Based on the aforementioned operating condition data, using the formula... The dominant order frequency is calculated, where f1 represents the dominant order frequency, n1 represents the engine speed, p represents the number of engine cylinders, and t represents the continuous time signal. The order harmonics are obtained based on the dominant order frequency, and the car engine sound model is constructed based on the order harmonics. S202: According to the car engine sound model, the first engine sound sample is truncated to the same length to obtain the second engine sound sample, and the sound frequency value and engine speed corresponding to the second engine sound sample are used as the sample label of the second engine sound sample. The second engine sound sample is obtained by adding a fixed sound superposition area data to a multiple of the engine's two cycle data.

2. The method for improving the simulated sound quality of a car engine according to claim 1, characterized in that, Step S201 specifically includes the car engine sound model being represented as follows: ,in, The signal represents the sound of a car engine, t represents the continuous time signal, and k represents the total number of orders of the harmonics. This represents the amplitude of the i-th order harmonic. The initial phase of the i-th harmonic is represented by the following term. This represents the random signal component accompanying the i-th order harmonic, where m represents the random signal. The i-th order represents the frequency of the principal order.

3. The method for improving the simulated sound quality of a car engine according to claim 1, characterized in that, Specifically, S5 includes superimposing the signals of two adjacent second engine sound samples according to the simulated engine speed to obtain the synthesized engine sound signal, which is represented as follows: Where x represents the synthesized engine sound signal, x1 and x2 represent two adjacent second engine sound samples, and A1 and A2 represent the amplitude of the second engine sound samples. and This indicates the phase of the second engine sound sample. , This shows the angular frequency of the second engine sound sample.

4. The method for improving the simulated sound quality of a car engine according to claim 1, characterized in that, Step S5 specifically also includes the attenuation model, which is expressed as follows: Where di represents the quality factor. This indicates the center frequency of the band-stop filter. This indicates the upper frequency limit of the band-stop filter. This indicates the lower cutoff frequency of the band-stop filter.

5. A system for improving the quality of simulated car engine sound, wherein the system employs the method for improving the quality of simulated car engine sound as described in claim 1, characterized in that, Includes the following modules: The sample library construction module is used to collect operating condition data of the driving state of a fuel vehicle and the corresponding real engine sound samples. The operating condition data includes engine speed and number of engine cylinders. A car engine sound model is constructed based on the operating condition data. A first engine sound sample is obtained by downsampling and low-pass filtering based on the real engine sound sample. A second engine sound sample is obtained by combining the first engine sound sample with the car engine sound model. Sample tags are created for the second engine sound sample based on the operating condition data, and the sample tags are associated with the engine speed. The second engine sound sample is output as a PCM format WAV file and stored to obtain a simulated engine sound sample library. The sample tags include sound frequency values ​​and engine speed. The data acquisition module is used to collect real-time driving information of the target vehicle, including real-time vehicle speed and real-time vehicle deceleration ratio. The data processing module is used to process the real-time driving information through a speed conversion model to obtain the simulated engine speed, associate the sample label with the simulated engine speed, and call the corresponding second engine sound sample according to the sample label; The sound quality optimization module is used to obtain a synthesized engine sound signal by superimposing the second engine sound sample, obtain a simulated engine sound signal by processing the synthesized engine sound signal through an attenuation model, and play the simulated engine sound signal through a preset speaker.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method for improving the quality of simulated car engine sound as described in any one of claims 1-4.

7. A storage medium containing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a computer processor, are used to perform the method for improving the quality of simulated car engine sound as described in any one of claims 1-4.

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