Time-Domain Analysis of Digital Speech Signals
The advances that have been made in digital electronics and computing since the 1960s have had an increasing impact on speech research and nowadays computers are used in almost every kind of experimental speech investigation. There are many advantages of using a computer in speech analysis. Among the most important are that there can be no degradation in the quality of the speech signal once it has been digitally encoded: it can be copied over and over again without any loss of information at all. On the other hand, an analogue tape-recorded speech signal suffers deterioration both with the passage of time and especially if it is repeatedly copied. Another advantage that the computer offers is easy retrieval of information. These days it is possible to store several hours of speech data on a computer disk. Moreover, if the data has been appropriately indexed, or labelled, then speech signals of a particular sound in context (such as all /n/ sounds that precede high vowels), or produced by a particular talker-group, can be very easily extracted and analysed (this should be compared with having to edit out appropriate sections of hours’ worth of tape-recorded speech). The software that is included with this book includes a search engine of just this kind.
KeywordsSpeech Signal Speech Production Vocal Tract Speech Data Hann Window
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