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Frequency response and perceived sound quality for mobile phones
2001 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The purpose of this investigation was to see how the perceived sound quality will be affected by changing the receiver’s frequency response in mobile phones and also to quantify the good sound quality from mobile phones. Eight frequency response filters were implemented in MATLAB based on reference samples (both female and male voice). 50 subjects participated in two sessions of listening test. In the paired-comparison test, subjects chose which channel of speech they prefer to hear from a mobile phone. Two stimuli were perceived better than the flat response used now for the receiver in mobile phones. In the scale test, subjects rated 6 adjectives used to describe sound quality in a seven-point scale. Objective measurement was also performed: Principle Component Analysis (PCA) and Partial Least Square (PLS) were applied to model the preference value from paired-comparison test on the basis of the psychoacoustical descriptors and the one-octave band levels. A model was developed based on Loudness (N), the one octave band level at 250 Hz (L250), 500 Hz (L500), 1 kHz (L1k), 2 kHz (L2k) and 4 kHz (L4k) for male voice. Subjective, objective and the prediction model revealed that people prefer to hear the sound, which has certain loudness level, fairly clear, not so natural and soft from mobile phones.

Place, publisher, year, edition, pages
Keyword [en]
Technology, sound quality, cellular phones
Keyword [sv]
URN: urn:nbn:se:ltu:diva-52309ISRN: LTU-EX--01/133--SELocal ID: 96e563cf-700f-41c3-9c21-44ef7740f961OAI: diva2:1025679
Subject / course
Student thesis, at least 15 credits
Educational program
Ergonomics, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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