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Erschienen in:
2008 | OriginalPaper | Buchkapitel
Telephone-Speech Quality
verfasst von : Ulrich Heute
Erschienen in: Speech and Audio Processing in Adverse Environments
Verlag: Springer Berlin Heidelberg
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A telephone user speaks and produces an acoustical sound pressure
s
0
(
t
). This signal, perhaps together with some surrounding disturbance, enters the microphone of the user’s handset, headset, or hands-free equipment. The electrical microphone output
x̌
0
(
t
) is then generally filtered and band-limited, before it is transmitted – nowadays digitally, of course. With some further possible distortions, it reaches the receiver. There it may be post-processed digitally and/or filtered again as an electrical signal, before an acoustical output
s
1
(
t
) is produced. The
quality
of this signal is our concern.