onr:"22194559"
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- Nykänen, Arne (author)
- Forum Acusticum : 07/09/2014 - 14/09/2014
Memory of AMR coded speech distorted by packet loss
- E-bookSwedish2014
Publisher, publication year, extent ...
- 2014
Numbers
- LIBRIS-ID:22194559
- http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-32099uri
- urn:nbn:se:ltu:diva-32099urn
- 67897be8-33d3-44a4-9ad0-0650ef550319
Supplementary language notes
- Language:Swedish
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Notes
- Godkänd; 2014; 20141210 (arny)
- gratis
- Previous studies have shown that free recall of spoken word lists is impaired if the speech is presented in background noise, even if the signal-to-noise ratio is kept at a level allowing full word identification. The objective of this study was to examine recall rates for word lists presented in noise and word lists coded by an AMR (Adaptive Multi Rate) telephone codec distorted by packet loss. Twenty subjects performed a word recall test. Word lists consisting of ten words were played to the subjects. The subjects repeated each word immediately after it had been played, to ensure that the words were heard correctly. After the complete list had been played the subjects wrote down all words remembered. In this way, both word identification and recall rates were measured. Three distorted conditions were compared with an undistorted control condition using a within-subject design: speech spectrum weighted noise at 4 dB SNR, and AMR coded speech with two levels of packet loss, one mild and one severe. The results confirmed the disruptive effect of noise on free recall of words, while no significant impairment was found for the AMR distortions. The noise and the AMR coding with mild packet loss gave approximately the same impairment of word identification. The AMR coding with severe packet loss gave a larger impairment of word identification, even though the word recall rate was unaffected. This result suggests that packet loss in AMR coded speech causes distortions which disrupt recall of words less than noise at levels resulting in the same change of word identification rates. Since impairment of word identification rates did not correlate with impairment of word recall rates models for quality prediction of speech reproductions should not be based on identification rates alone.
Subject headings and genre
- Engineering and Technology hsv
- Mechanical Engineering hsv
- Fluid Mechanics and Acoustics hsv
- Teknik och teknologier hsv
- Maskinteknik hsv
- Strömningsmekanik och akustik hsv
- Engineering and Technology hsv
- Civil Engineering hsv
- Other Civil Engineering hsv
- Teknik och teknologier hsv
- Samhällsbyggnadsteknik hsv
- Annan samhällsbyggnadsteknik hsv
- Teknisk akustik ltu
- Engineering Acoustics ltu
- Drift och underhållsteknik ltu
- Operation and Maintenance ltu
Added entries (persons, corporate bodies, meetings, titles ...)
- Lindegren, David (author)
- Wruck, Louisa (author)
- Ljung, Robert (author)
- Odelius, Johan (author)
- Möller, Sebastian (author)
- Luleå tekniska universitetInstitutionen för samhällsbyggnad och naturresurser (publisher)
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