Digital Signal Processing Reference
In-Depth Information
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(ii)
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(a) Stationary voiced speech
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(b) Transitory speech
Figure 9.2
Speech synthesized using ACELP
9.2 Design Challenges of a Hybrid Coder
The main challenges in designing a hybrid coder are reliable speech classifica-
tion and phase synchronization when switching between the coding modes.
Furthermore, most of the speech-coding techniques make use of a look-ahead
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