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Higher bandwidths than that of the 300 to 3400 Hz
telephone bandwidth result in major subjective improvements in
represented speech quality [3,4].
A bandwidth of 50 to 7000 Hz not only
improves the intelligibility and naturalness of speech, but adds also
a feeling of transparent communication and eases speaker
recognition.
Application areas of wideband speech include [2]
- Audio and video teleconferencing where broadened bandwidth(50-7000
Hz) provides improved sound quality,more presence of the speaker, and
a more realistic rendering of the actual sound in a room.
- Digital AM radio broadcasting where the 50-7000 Hz band is
currently used for high-quality voice transmission.
- High-fidelity telephony where broadcast quality voice is
transmitted over cables, fiber optic networks or even the local
loop(after modification to eliminate the current band-limiting
networks).
- Dual language programming in audio and audio/video broadcasts of
news, TV programs, closed circuit lectures, etc.
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