DOCSLIB.ORG

Research Article Artificial Engine Sound Synthesis Method for Modification of the Acoustic Characteristics of Electric Vehicles

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Research Article Artificial Engine Sound Synthesis Method for Modification of the Acoustic Characteristics of Electric Vehicles Hindawi Shock and Vibration Volume 2018, Article ID 5209207, 8 pages https://doi.org/10.1155/2018/5209207 Research Article Artificial Engine Sound Synthesis Method for Modification of the Acoustic Characteristics of Electric Vehicles Dongki Min, Buhm Park, and Junhong Park Department of Mechanical Engineering, Hanyang University, Seoul 133-791, Republic of Korea Correspondence should be addressed to Junhong Park; [email protected] Received 15 January 2018; Accepted 6 March 2018; Published 10 April 2018 Academic Editor: Marcello Vanali Copyright © 2018 Dongki Min et al. Tis is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Sound radiation from electric motor-driven vehicles is negligibly small compared to sound radiation from internal combustion engine automobiles. When running on a local road, an artifcial sound is required as a warning signal for the safety of pedestrians. In this study, an engine sound was synthesized by combining artifcial mechanical and combustion sounds. Te mechanical sounds were made by summing harmonic components representing sounds from rotating engine cranks. Te harmonic components, including not only magnitude but also phase due to frequency, were obtained by the numerical integration method. Te combustion noise was simulated by random sounds with similar spectral characteristics to the measured value and its amplitude was synchronized by the rotating speed. Important parameters essential for the synthesized sound to be evaluated as radiation from actual engines were proposed. Tis approach enabled playing of sounds for arbitrary engines. Te synthesized engine sounds were evaluated for recognizability of vehicle approach and sound impression through auditory experiments. 1. Introduction used synchronous discrete Fourier transform and subopti- malmultipulseexcitationapproachestogeneraterealistic With the increasing use of electric motor-driven vehicles engine sounds. Airplane engine sounds were generated by due to their advantages such as environmental friendliness combining broadband and individual tonal contributions and fuel-efcient performance [1], it is necessary to generate [7, 8] to determine the annoyance level and how to reduce artifcial sounds to inform pedestrians and cyclists of the it efciently. Hastings [9] used deterministic and random vehicle’s approach. In addition, drivers prefer sounds similar variation in sound amplitude to regenerate diesel engine to internal combustion engines for auditory satisfaction, and sounds. With amplitude variation following a rotating crank the sounds should represent the current status (acceleration shaf, the random signals generated with impulse trains were or deceleration) of the vehicle, for example, start-up or rapid acceleration and deceleration. A simple method of generating used to generate artifcial sounds for annoyance evaluation. artifcial engine sounds is to play recorded combustion engine Artifcial engine sound generators mounted on low noise sounds according to engine rotating speeds. However, this vehicles have used simple sounds for warning pedestrians method exhibits limited performance for reproducing the outside the vehicle. Te playing of sampled engine sounds for complex conditions of a vehicle and requires an impractical various rotating speeds was widely used in previous studies number of recordings for generating artifcial sounds for on artifcial engine sound synthesis [10–18]. A system has various vehicle statuses from a single machine. An artifcial been developed to warn pedestrians by using sine wave engine sound generator is considered the most efective sweep signals [10–13], motor sounds [14], and future-oriented solution. Tis sound generator should be designed to make new sounds using instrument sounds [15]. Te synthesizing a positive impression on people to minimize the possibility method utilizing the premeasured actual engine sounds has of noise pollution. the advantage of using less memory, but there is a limitation in Subjective evaluations of various engine sounds were creating a variety of sounds in relation to the vehicle speeds. performed in previous studies [2–5]. Amman and Das Active noise control and active sound design techniques [6] proposed deterministic and stochastic components and have been used to reduce low-frequency engine noise and 2 Shock and Vibration synthesize harmonics to enhance existing engine sound Control room quality [16]. Te artifcial complex sounds were required to minimize noise according to the driving conditions of the vehicle[17,18].Equalizershavebeendevelopedtoallow Engine controller Recorder setup of parameters adjusting the amplitude and range of the spectrum of basic sound building blocks. Engine room Window Window In this study, an artifcial engine sound generator was developed using a sample-based algorithm. With the sys- tematic data processing, engine sounds that are similar to Microphone the actual engine sound are generated. Artifcial engine Gasoline Diesel sound synthesis method was implemented by analyzing the engine engine actual engine sound generation mechanism. Te numerical integration method allows construction of an optimal data set generating the engine sound. Synthesized artifcial engine Exhaust Exhaust sounds according to the vehicle engine speed were generated by applying a sample-based algorithm. Figure 1: Overall schematic view of the laboratory chamber. Many researches recorded and used the actual vehicle engine sound for sound synthesis. Te artifcial engine sound generator requires a CAN (controller area network) bus communication module and a sound module. Tis method analysis.Temeasuredenginenoisewasusedtodefne is simple to use and implements actual engine sounds (or the mechanical and combustion noise. Figure 1 shows the presynthesized beeps), but the types and scalability of sounds experimental setup to measure the engine sound. Figure 1 are limited and require a lot of memory. Te auditory satisfac- shows an overall schematic view of the laboratory chamber tion of the user is also limited because it is difcult for the user that has the controller adjusting operating conditions. Te to change the sound. To generate engine sounds, parameters microphone used to measure sounds from each engine was related to engine characteristics such as number of cylinders, located 1 meter from the engine. Te engines used in the rotating speed, engine type, combustion pressure profle, experiment were equipped with 4 cylinders. Te engine room timing, and amplitude modulation should be considered. was surrounded by walls made of glass and porous panels. Te For generation of engine sounds to be unique for each sounds were measured for 10 seconds when the engine speed vehicle, important parameters that infuence engine sound was 1000, 1500, 1800, and 2100 rpm, with idle conditions of perception should be fully understood. 850 and 820 rpm for gasoline and diesel engines, respectively. In this study, a mathematical formulation to generate Figure 2 compares the sound of the gasoline engine to that artifcial engine sounds to meet consumer preferences is of the diesel engine at various rotation speeds. Te measured proposed. With this approach, fexible generation of engine results were focused on the spectrum characteristics of the sounds without playing sampled sounds is possible. To ana- mechanical sound and the combustion sound. Te high- lyze the characteristics of engine sounds, gasoline and diesel frequency component of the diesel engine combustion noise engine sounds were recorded. Afer spectrum analysis, the was higher than that of the gasoline engine. mechanical and combustion engine sounds were separated. Te combustion noise propagates into the air through Te mechanical sounds were synthesized using a summation the vibration of the various structures that make up the of tonal sounds. Te combustion sounds were generated engine. Te factors afecting the pressure profle include using spectrum amplitude-modulated random sounds to injection strategy, combustion chamber geometry, air-fuel exhibit a specifc frequency envelope. Te artifcial engine mixture ratio, compression ratio, and amplitude changes sound was synthesized by combining these mechanical and due to explosion [20–24]. Te resonance frequency of the combustion engine sounds. For illustration, several diferent crankcaseandthecylinderblockintherangeof200to engine sounds were generated and used in the evaluation of 1000 Hz, the timing gear, the rocker cover in the range of 1000 perception. Recognizability of vehicle approaches and per- to 5000 Hz, and the cast aluminum cover and the thin cast ceived quality of the artifcial engine sounds were evaluated iron in 5000 Hz were analyzed. Te engine structures have by comparison to actual recorded engine sounds. Tis also diferent emission efciencies. Te frequency components provided information on the sound generation mechanism were attenuated by more than 10 dB afer 1 kHz for the diesel for actual engines and its perceived characteristics. Engine engines [25]. Te contribution of the noise generated in sound characteristics must be understood for both design of thewidebandover1kHzisrelativelylowcomparedtothe quiet vehicle engines and artifcial engine sound-producing mechanical sound of the tonal components. Te sound level devices. is refected in frequencies and bands magnitude multiplied by artifcial mechanical and combustion
Load more

Recommended publications
  • Industry Insights
    Simcenter Active Sound Design for automotive Solution brief Siemens Digital Industries Software The Simcenter™ Testlab™ software At the same time, legislators have Challenges portfolio for sound quality engineering imposed legal requirements for AVAS to • Develop compliant AVAS sound that is includes a solution for active sound be installed in quiet vehicles to warn also a recognizable brand sound design for automotive. It’s an advanced pedestrians when driven at lower speeds. sound quality engineering tool for • Enhance interior noise to match New active sound design teams are design, validation, tuning and deploy- required sound quality perception taking up the challenge to design, vali- ment of interior sound enhancement for date and implement these sounds. They hybrid/electrical vehicles (HEVs) and Solutions emerge as cross-functional teams, shar- internal combustion engine (ICE) vehi- ing expertise from different domains. On • Use Simcenter Testlab Sound Designer cles, and for mandatory exterior acoustic one hand there are the noise, vibration vehicle alert system (AVAS) sounds. It’s • Validate inside the vehicle with the and harshness (NVH) experts that engi- based on state-of-the-art sound synthesis Vehicle Unit neer interior and exterior sound quality techniques. It’s complemented with by working on acoustic transfer paths, • Use AVAS unit to synthesize sound hardware to evaluate and tune sound using isolation material for masking noise signatures in real-time in the target (or • Interface to vehicle’s CAN bus with and shaping engine orders with struc- mule) vehicle, or on a vehicle simulator. CAN Gateway tural modifications. Creating an immersive driving On the other hand, there are the sound Results experience designers that have mastered expertise • Design, validate or tune sound With engine downsizing, weight reduc- from the audio domain.
    [Show full text]
  • Research and Development in Acoustics for Practical Sound Control Engineering
    RESEARCH AND DEVELOPMENT IN ACOUSTICS FOR PRACTICAL SOUND CONTROL ENGINEERING Joachim Scheuren Müller-BBM GmbH, Planegg, Germany [email protected] Abstract Due to the pleasance and relevance listening to sounds may have, the investigation and targeted appli- cation of acoustic principles has been a constitutive element of natural science and technology since the earliest times. Starting from enjoyable sounds and communication once, the glut of today’s unwanted sounds as well as the unlimited availability of specially generated, wanted sounds have turned acoustics into an indispensable element of modern technology. This has been strongly pushed forward by the need for well-aimed control of unwanted, annoying or even health affecting sounds and vibrations as inherently generated by our progressively mechanised world. Thus, practical noise con- trol engineering has strongly contributed to and benefited from any progress in the field of acoustics. And, to meet future challenges, effective noise control engineering will continue to stimulate as well as to crucially depend on further progress in acoustics. The lecture demonstrates how research on noise effects helps to identify problems, how such problems then provoke better insight and methodological approaches and, finally, how any related acoustic progress then leads to innovative solutions in practical noise control. To further highlight the importance of research and development in acoustics for practical noise control engineering, recent fields of interest will be presented and discussed in some detail: the capabilities of experimental mod- elling in transfer path analysis and synthesis, the conceptive impact of modelling rolling noise genera- tion, the great potential of consequent application of acoustic principles to silent road surface design and the innovative perspectives of active sound control.
    [Show full text]
  • 2014 Veloster Adds Performance, Convenience and Safety Appeal to Innovative 3­Door Sport Coupe
    Hyundai Motor America 10550 Talbert Ave, Fountain Valley, CA 92708 MEDIA WEBSITE: HyundaiNews.com CORPORATE WEBSITE: HyundaiUSA.com FOR IMMEDIATE RELEASE 2014 VELOSTER ADDS PERFORMANCE, CONVENIENCE AND SAFETY APPEAL TO INNOVATIVE 3­DOOR SPORT COUPE Jim Trainor Derek Joyce Director Product Public Relations Manager (714) 594­1629 (714) 594­1728 [email protected] [email protected] ID: 39868 Turbo Models add Torque Vectoring Control and Active Sound Design Success of Special Edition RE:MIX model Spawns more Variants in the Near Future COSTA MESA, Calif., November 19, 2013 – Hyundai’s convention­shattering Veloster adds even more convenience, safety and performance for 2014, further increasing the appeal of the popular sporty coupe. Both Veloster and Veloster Turbo models feature cutting­edge powertrain technologies like direct injection, optimizing their appeal to youthful customers by combining excellent fuel economy, spirited performance and low emissions without compromise. Veloster’s strong appeal is evident in the marketplace, with high sales velocities and tight supplies, particularly of the fully­loaded Veloster Turbo models. Overall, the popularity of high­content Velosters, both naturally­aspirated and turbo models, is yielding higher transaction prices and strong residual values. The first limited edition, Veloster RE:MIX, is nearly sold out, representing about 10 percent of Veloster sales during its availability period. Based on the success of the RE:MIX edition, Hyundai is bringing new Veloster special editions to the market
    [Show full text]
  • Comprehensive Automotive Active Sound Design Part 1: Electric and Combustion Vehicles
    Comprehensive Automotive Active Sound Design part 1: electric and combustion vehicles Markus BODDEN; Torsten BELSCHNER neosonic, Germany ABSTRACT The optimization of vehicle sound does not only require the optimization of each component, but the optimization of the combination of the different sounds in order to achieve a homogenous and effective overall sound. Active Sound Design methods offer new possibilities to achieve this ambitious aim, and furthermore to align the overall sound to the Brand Identity. neosonic has developed the modular comprehensive Active Sound Design system elvis3 (ELaborate Vehicle Integrated Sound Signature System) which integrates all audio aspects of the vehicle into one comprehensive tool chain. One component of the system, elvis3 e-motion, is the world’s first system used in series in an electric vehicle to create interior vehicle sound (AMG SLS ED Coupe). With the innovative signature-based approach the AMG sound of the 21st century has been realized. A second component, elvis3 Cesar, implements sophisticated support for vehicles with combustion engines using refined signal processing. These two components will be explained in detail along with the flexible system concept. Advanced system modules and applications are part of the second presentation. Keywords: Active Sound Design I-INCE Classification of Subjects Number(s): 38.2 1. INTRODUCTION A lot of different components contribute to the overall vehicle sound. Major sources are the engine and road and wind contributions, supplemented by a variety of other components originating from the gearbox, the climate system, and all electric and mechanic components, plus the feedback and warning sounds. The typical way is to optimize each component separately during its development process, resulting in the fact that a systematic optimization and harmonization of the resulting overall vehicle sound is not possible.
    [Show full text]
  • Active Sound Design for a Passenger Car Based on Adaptive Order Filter
    Active sound design for a passenger car based on adaptive order filter Sang kwon LEE1; Seung Min LEE2; In Deuk KANG3; Taejin SHIN4 1 Inha University, Korea 2 Inha University, Korea 3 Inha University, Korea 4 Inha University, Korea ABSTRACT The paper presents an adaptive order filter for the sound design of a passenger car. The engine speed is calculated by using the pulse signal detected at engine speed sensor such as cam shaft position sensor (CSPS) or engine ignition position sensor (EIPS). Nowadays, the pulse signal of engine speed is delivered to the engine management control unit (ECU) system. The ECU supplies the engine speed data to the display throughout a high speed gateway. The ANC system can also use this data for the generation of reference signal. Most of reference signals used for the noise control of an engine are the sine wave at the instant frequency (rpm/60). This sine wave is discretely changed with the increment of engine speed but not continuous. Therefore, the ANC system using this reference cannot work when the engine speed is changed rapidly form 1000rpm to 6000rpm but work well at the fixed rpm. In this paper new adaptive order filter (AOF) for the ANC system of interior noise of a car is proposed. The new algorism uses the continuous reference signal instead of the sine wave. This ANC system is also applied for the active sound design (ASD). The AOF is very excellent algorithm for the ASD of a vehicle. Keywords: Active Noise Control(ANC), Adaptive Order Filter(AOF), Active Sound Design(ASD) 1.
    [Show full text]
  • Active Sound Design 04 Active Sound Design
    Table of Contents Active Sound Design Subject Page Introduction . .3 System Overview . .4 Active Sound Design Variants . .6 HiFi System (AMPH) . .6 Top HiFi System (AMPT) . .8 Service Procedures . .10 Component Replacement . .10 Diagnosis . .10 Initial Print Date: 01/12 Revision Date: Active Sound Design (ASD) Models: E89 Z4 sDrive28i & F10 M5 Production: Late 2011 for E89 and start of production for F10 M5 After completion of this module you will be able to: • Understand the function and operation of the ASD system. 2 ASD Introduction BMW installed for the first time an “engine sound system” in the E85 Z4 3.0si. The intake noise of the engine was enhanced by means of a resonator and pipe routing without active intervention at the passenger compartment. As the name Active Sound Design (ASD) suggests, the Active Sound Design is an active system. The engine sound is evaluated by means of a control unit. The engine sound is evaluated according to the programed sound specification and various parame- ters such as the accelerator pedal angle (driver's desired load), engine speed and torque for example. It is then output via the vehicle's own audio system in the passenger com- partment. The ASD system complements the sound of the interior space of the passenger com- partment through electronically generated engine sounds. Due to the increasingly better vehicle noise absorption and increased vehicle performance, BMW is initially launching the system in some models. Additionally other noise generated applications are still pos- sible, such as sound generation in the vehicle exterior area for electric vehicles.
    [Show full text]
  • Developing Cost-Effective, Power-Efficient Active Noise
    Developing Cost-Effective, Power-Efficient Active Noise Control Applications with Dedicated DSPs By Dr. Rolf Schirmacher, Managing Director, Müller-BBM Active Sound Technology, and Gerard Andrews, Product Director, Cadence Design Systems As automotive engineers strive to create “greener” vehicles, some of their energy-saving techniques—such as removing vibration reduction materials or allowing higher cylinder engines to operate with fewer cylinders under certain driving conditions—are resulting in a noisier cabin experience. In order to provide a better driving experience and reduce this newly introduced noise, many engineers are now tapping into the vehicle’s audio system to cancel out the noise, a process known as active noise control (ANC). To be effective, ANC systems must be designed for real-time, low-latency performance. Using a dedicated audio DSP presents a cost-effective technique to implement low-latency ANC algorithms and, in many cases, other audio processing as well. Having such a core integrated in some larger system on chip (SoC) combines the benefits of two worlds – dedicated low-latency computing resources without extra components or board space. Introduction Contents For as long as combustion engines have existed, automotive engineers have Introduction ......................................1 had to address low-frequency RPM-dependent noise. The most prominent component originates from firing up the cylinders, and if this firing frequency Active Noise Control hits the vehicle interior resonance, a prominent booming noise occurs. vs. Active Sound Design ...................2 For fewer cylinders and lower RPM—used for more efficient automotive Infotainment System At a Glance ......3 powertrains in greener vehicles—the engine noise is lower in frequency and more likely to result in booming, which is louder and more disturbing from a Integrating Active Sound customer perspective.
    [Show full text]
  • A New Method for Active Cancellation of Engine Order Noise in a Passenger Car
    applied sciences Article A New Method for Active Cancellation of Engine Order Noise in a Passenger Car Sang-Kwon Lee * ID , Seungmin Lee, Jiseon Back and Taejin Shin Acoustics and Vibration Signal Processing Lab., Department of Mechanical Engineering, Inha University, Incheon 22201, Korea; [email protected] (S.L.); [email protected] (J.B.); [email protected] (T.S.) * Correspondence: [email protected]; Tel.: +82-032-860-7305 Received: 8 June 2018; Accepted: 14 August 2018; Published: 17 August 2018 Featured Application: The proposed framework is highly suitable for audio applications for active sound noise cancellation and active sound design in a vehicle. Abstract: This paper presents a novel active noise cancellation (ANC) method to reduce the engine noise inside the cabin of a car. During the last three decades, many methods have been developed for the active control of a quasi-stationary narrowband sinusoidal signal. However, since the interior noise signal is non-stationary with a fast frequency variation when the car accelerates rapidly, these methods cannot stably reduce the interior noise. The proposed method can reduce the interior noise stably even if the speed of the car is changed quickly. The method uses an adaptive filter with an optimal weight vector for the active control of such an engine noise. The method of determining the optimal weight vector of an adaptive filter is demonstrated. In order to validate the advantages of the proposed method, a conventional method and the proposed method are simulated with three synthesized signals. Finally, the proposed method is applied to the cancellation of booming noise in a sport utility vehicle.
    [Show full text]
  • How to Make Remarkable Sound of Electrical Vehicles Inside out with Active Sound Design How to Play the Audio Files in This Document?
    How to make remarkable sound of electrical vehicles inside out with active sound design How to play the audio files in this document? 1. Open the file in Adobe Acrobat Reader 2. Click on the loudspeaker icon and play the sound 3. If that doesn’t work, change the following settings: • In the menu, select Edit -> Preferences • Left menu: chose Security (Enhanced) • Under Sandbox Protections, uncheck the box for Enable Protected Mode at Startup • Under Enhanced Security, uncheck box for Enable Enhanced Security • Click OK and restart Adobe Reader Unrestricted © Siemens 2020 Page 1 2020-MM-DD Siemens Digital Industries Software Why adding sounds to the vehicle? BECAUSE YOU MUST BECAUSE YOU CAN ENSURE PROTECT BRAND STRIVE UNIQUE REDUCE COMPLIANCE REPUTATION BRAND VALUE COSTS Unrestricted © Siemens 2020 Page 2 2020-06-16 Siemens Digital Industries Software DESIGN VALIDATE & TUNE DEPLOY From brand sound to drivable sound model Validation in the vehicle Integration in production vehicle Granular synthesis | Order synthesis Real-time sound tuning Ready for mass production Brand sound Active sound In-vehicle Sound quality Audio amplifier Vehicle audio exploration model creation validation analysis tuning integration Interior sound Interior Brand sound AVAS model Frontloading In-vehicle AVAS Vehicle Regulation AVAS exploration creation compliance tuning integration validation Industrialization DESIGN VALIDATE & TUNE DEPLOY From brand sound Exterior sound Exterior Upfront compliance to standards Integration in production vehicle Unrestricted to© Siemenspedestrian
    [Show full text]
  • Brief Simcenter Active Sound Design for Automotive the Simcenter
    Simcenter Active Sound Design for automotive Solution brief Siemens Digital Industries Software The Simcenter™ Testlab™ software At the same time, legislators have Challenges portfolio for sound quality engineering imposed legal requirements for AVAS to • Develop compliant AVAS sound that is includes a solution for active sound be installed in quiet vehicles to warn also a recognizable brand sound design for automotive. It’s an advanced pedestrians when driven at lower speeds. sound quality engineering tool for • Enhance interior noise to match New active sound design teams are design, validation, tuning and deploy- required sound quality perception taking up the challenge to design, vali- ment of interior sound enhancement for date and implement these sounds. They hybrid/electrical vehicles (HEVs) and Solutions emerge as cross-functional teams, shar- internal combustion engine (ICE) vehi- ing expertise from different domains. On • Use Simcenter Testlab Sound Designer cles, and for mandatory exterior acoustic one hand there are the noise, vibration vehicle alert system (AVAS) sounds. It’s • Validate inside the vehicle with the and harshness (NVH) experts that engi- based on state-of-the-art sound synthesis Vehicle Unit neer interior and exterior sound quality techniques. It’s complemented with by working on acoustic transfer paths, • Use AVAS unit to synthesize sound hardware to evaluate and tune sound using isolation material for masking noise signatures in real-time in the target (or • Interface to vehicle’s CAN bus with and shaping engine orders with struc- mule) vehicle, or on a vehicle simulator. CAN Gateway tural modifications. Creating an immersive driving On the other hand, there are the sound Results experience designers that have mastered expertise • Design, validate or tune sound With engine downsizing, weight reduc- from the audio domain.
    [Show full text]
  • Active Sound Design 04 Active Sound Design
    Table of Contents Active Sound Design Subject Page Introduction . .3 System Overview . .4 Active Sound Design Variants . .6 HiFi System (AMPH) . .6 Top HiFi System (AMPT) . .8 Service Procedures . .10 Component Replacement . .10 Diagnosis . .10 Initial Print Date: 01/12 Revision Date: Active Sound Design (ASD) Models: E89 Z4 sDrive28i & F10 M5 Production: Late 2011 for E89 and start of production for F10 M5 After completion of this module you will be able to: • Understand the function and operation of the ASD system. 2 ASD Introduction BMW installed for the first time an “engine sound system” in the E85 Z4 3.0si. The intake noise of the engine was enhanced by means of a resonator and pipe routing without active intervention at the passenger compartment. As the name Active Sound Design (ASD) suggests, the Active Sound Design is an active system. The engine sound is evaluated by means of a control unit. The engine sound is evaluated according to the programed sound specification and various parame- ters such as the accelerator pedal angle (driver's desired load), engine speed and torque for example. It is then output via the vehicle's own audio system in the passenger com- partment. The ASD system complements the sound of the interior space of the passenger com- partment through electronically generated engine sounds. Due to the increasingly better vehicle noise absorption and increased vehicle performance, BMW is initially launching the system in some models. Additionally other noise generated applications are still pos- sible, such as sound generation in the vehicle exterior area for electric vehicles.
    [Show full text]
  • Active Sound Design: Vacuum Cleaner
    ACTIVE SOUND DESIGN: VACUUM CLEANER PACS REFERENCE: 43.50 Qp Bodden, Markus (1); Iglseder, Heinrich (2) (1): Ingenieurbüro Dr. Bodden; (2): STMS Ingenieurbüro (1): Ursulastr. 21; (2): im Fasanenkamp 10 (1): D-45131 Essen; (2): D-31552 Rodenberg Germany Tel: +49 201 4 30 84-17 Fax: +49 201 4 30 84-18 E-mail: [email protected] ABSTRACT The acoustical channel is explicitly feasible to intuitively inform the user of a product about the current status of operation and to give a feedback about the performed action. The inherently produced sound of the product often is not sufficient to give an appropriate feedback, so that additional signals have to be generated and reproduced. A patent pending method of Active Sound Design for vacuum cleaners is presented in this paper. The amount of currently aspired dust is measured, and this data is used to generate an acoustical feedback. This feedback is played back via a loudspeaker integrated into the vacuum cleaner. INTRODUCTION The definition of Sound Quality by Blauert and Bodden (1994, “Sound Quality is the suitability of a sound for a specific technical task”, see also Bodden, 1997) means that the sounds of products are not undesired in general, but that they fulfill a specific purpose. In this context the aspects of interaction in order to be able to control and to handle a product and the satisfaction of the user are especially important. The sounds that products emit are not only noises, they are suitable to transmit information to the user. The acoustical channel is especially suitable to inform the user about the status of operation of a product and to give a feedback about the executed action.
    [Show full text]