A Standardized Scale for the Assessment of Car Interior Sound Quality

Bisping, Rudolf; Giehl, Sönke; Vogt, Martin

doi:10.4271/971976

Cited by 13 publications

(8 citation statements)

References 2 publications

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“…This is done for each subject in the evaluation and then the percentages are averaged together for a particular stimulus. Bisping 18 gives an accounting of this technique with a comparison to absolute scaling.…”

Section: Analysis Methodsmentioning

confidence: 99%

Guidelines for Jury Evaluations of Automotive Sounds

Otto

Amman

Eaton

et al. 1999

SAE Technical Paper Series

122

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Room Acoustics. If the sounds are presented over loudspeakers in any room other than an anechoic chamber, the frequency characteristics of the room will be superimposed on the frequency characteristics of the loudspeaker and the sounds. Room resonances will then have an effect on the perceived sound. Additionally, if a jury evaluation is being conducted in which the subjects are physically located in different positions within the room, the room acoustics will affect the sound differently for each subject. No longer will all the subjects experience the exact same sound, thus, introducing a bias into the results. If it is necessary to conduct listening evaluations using loudspeakers, adherence to Sections 4.1 (Room size and shape), 4.2.1 (Reflections and reverberation), and 4.2.2 (Room modes) of the AES standard 1 is recommended. It is recommended that loudspeaker arrangement conform to AES20-1996 Section 5.2 (Loudspeaker locations) and location of listeners conform to AES20-1996 Section 5.4 (Listening locations).Ambient Noise. Control of ambient noise is essential for the proper administration of a subjective listening evaluation. Noise sources within the listening room can be due to: computer fans, fluorescent lighting, HVAC, etc. The influence of these sources can be minimized through the remote location or containment of computers in acoustic enclosures, incandescent lighting and HVAC baffles/sound treatment. High transmission loss into the room is desirable to minimize the influences of outside noise.Single value dB or dBA levels are generally inadequate in describing the ambient noise levels of indoor environments. ANSI S3.1 defines octave and one-third octave band noise levels for audiometric test rooms. 2 However, bands below 125 Hz are undefined and everyday sounds with energy below 125 Hz are commonly encountered. As a result, it is recommended that ambient noise levels should conform to NCB (noise criteria) 20 or better 3 which specifies allowable levels in the 16 to 8000 Hz octave bands.During jury evaluations, the station at which the subject is located should be free from influences from the other subjects. Many times partitions are placed between subjects to minimize interaction between subjects. When listening to low level sounds, subjects with colds or respiratory ailments can make it difficult for not only themselves but also adjacent subjects to hear the stimuli.Decor. The listening room should be a comfortable and inviting environment for the subject. The room should look natural as opposed to "high tech." The more clinical the room looks, the more apprehension and anxiety the subjects will experience. Neutral colors should be used for the walls and furniture. Comfortable chairs and headphones (if used) are essential to reducing distractions and keeping the subject focused on the task at hand. Moderate lighting should be used. Lighting which is too dim may reduce a subject's attention to the desired task, especially, during lengthy or monotonous listening evaluations.Air Circulation, Temperatur...

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Section: Analysis Methodsmentioning

confidence: 99%

Guidelines for Jury Evaluations of Automotive Sounds

Otto

Amman

Eaton

et al. 1999

SAE Technical Paper Series

122

View full text Add to dashboard Cite

show abstract

“…In recent years, not only the quietness but also the sound quality has been focused on in vehicle development. Various sound quality indices have been developed on the basis of auditory perception characteristics and some of them consider the nationality of the drivers [1][2][3][4][5]. In most of these studies, auditory evaluation tests were carried out by presenting sounds without designated visual stimuli.…”

Section: Introductionmentioning

confidence: 99%

Influence of vehicle-exterior image on sound quality evaluation of Japanese and German drivers

Völk

Fastl

Rigoll

2016

Acoust. Sci. & Tech.

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In this study, an influence of vehicle-exterior image on sound quality evaluation was investigated. Luxury-or sporty-vehicle image was presented to Japanese or German frequent drivers, while listening to an acceleration sound. Subsequently, loudness, luxury and sportiness for the sound were rated. As the result, significant influence was not observed in the loudness and luxury evaluation in both nationalities. However, sportiness rating to the presented sound was markedly increased when the sporty-vehicle image was presented with the sound. Consequently, it appeared that the influence of the vehicle-exterior image on the sound quality rating differs depending on the evaluation parameter and sportiness is markedly affected by the visual information.

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“…As can be inferred from various studies about the relationship between loudness and pleasantness of vehicle sound, 3,4 loudness increment, which is inevitable in this technique, should be minimized. In addition, sharpness, which is related to the proportion of high-frequency components, is known to be negatively correlated to sensory pleasantness.…”

Section: Introductionmentioning

confidence: 99%

“…3,4 In order to solve the problems, the method of introducing virtual sounds to EV interior sound is commonly proposed. 5,6 This concept, active sound design, has a great advantage in that structural modification is unnecessary.…”

Section: Introductionmentioning

confidence: 99%

Application of subharmonics for active sound design of electric vehicles

Gwak

Yoon

Seong

et al. 2014

The Journal of the Acoustical Society of America

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The powertrain of electric vehicles generates an unfamiliar acoustical environment for customers. This paper seeks optimal interior sound for electric vehicles based on psychoacoustic knowledge and musical harmonic theory. The concept of inserting a virtual sound, which consists of the subharmonics of an existing high-frequency component, is suggested to improve sound quality. Subjective evaluation results indicate that the impression of interior sound can be enhanced in this manner. Increased appeal is achieved through two designed stimuli, which proves the effectiveness of the method proposed.

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A Standardized Scale for the Assessment of Car Interior Sound Quality

Cited by 13 publications

References 2 publications

Guidelines for Jury Evaluations of Automotive Sounds

Guidelines for Jury Evaluations of Automotive Sounds

Influence of vehicle-exterior image on sound quality evaluation of Japanese and German drivers

Application of subharmonics for active sound design of electric vehicles

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