Does distortion of digitally coded speech decrease recall of spoken words?
Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
This study is examining if digital distortions of GSM coded telephone signals impair ones capability of remembering speech. Earlier studies have shown an impairing eﬀect on memory of spoken words when being presented in noise or long reverberation. Digital distortions, e.g. packet loss, echoes or jitter are assumed to have similar eﬀects on working memory. Digital distortions are often caused by packet loss. In this experiment eﬀects on working memory due to packet loss in GSM- coded speech was investigated and compared to a noise condition. Word lists with 10 words in each list were presented via headphones. To ensure that the sub jects perceived all words correctly the sub jects were asked to repeat all words directly after listening to them. After all ten words had been presented they were asked to write down as many words as they could remember. Four conditions were compared: one undistorted signal, one signal distorted by noise (signal to noise ratio S/N 4 dB), one signal which was distorted by light and one with severe packet loss. The order of conditions was randomized. In consistence with previous studies, an impairing eﬀect of noise on the participants’ ability to recall the spoken words was shown, while packet loss did not aﬀect recall of spoken words. It is suggested that further studies with other kinds of distortions should be carried out. Future studies should also include recall of spoken lectures or stories, as it is assumed that diﬀerent memory process are used under such conditions.
Place, publisher, year, edition, pages
2014. , 37 p.
Technology, digital distortion, working memory, free recall, packet loss
IdentifiersURN: urn:nbn:se:ltu:diva-56361Local ID: d23c2783-c993-4d45-a02a-3769d6f079c2OAI: oai:DiVA.org:ltu-56361DiVA: diva2:1029748
Subject / course
Student thesis, at least 15 credits
Engineering Physics and Electrical Engineering, bachelor's level
Validerat; 20140228 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved