Laura Laaksonen

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The limited audio bandwidth used in telephone systems degrades both the quality and the intelligibility of speech. This paper presents a new method for the bandwidth extension of telephone speech. Frequency components are added to the frequency band 4–8 kHz using only the information in the narrowband speech. First, a wideband excitation is generated by(More)
Efficient teleconference system can be created by extending the speech bandwidth and using spatial audio. If wideband speech transmission was not supported as such, an alternative way to extend the bandwidth is by exploiting an artificial bandwidth extension (ABE) algorithm. In such methods the audio bandwidth is extended in the receiving end, without any(More)
SUMMARY The aim of this study was to investigate how different acoustic parameters, extracted both from speech pressure waveforms and glottal flows, can be used in measuring vocal loading in modern working environments and how these parameters reflect the possible changes in the vocal function during a working day. In addition, correlations between(More)