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- W1676371511 abstract "Abstract This article is focused on speech coding methods for achieving communication quality speech at bit rates of 4 kbit/s and lower. The speech coding techniques are based on an all‐pole model of the vocal tract which may be implemented in the time domain with appropriately selected excitation functions or else may be fit to a spectral analysis of the speech signal. Three main types of coders are described below. Code‐excited linear prediction (CELP) coders select their excitation from waveform codebooks using analysis‐by‐synthesis closed‐loop techniques, which need to be supplemented by speech classification and open‐loop parametric techniques for keeping up with quality at lower rates. The prototypical sinusoidal coder (SC) has a bank of oscillators for signal synthesis, driven by a model of the magnitude spectrum. However, phase regeneration is important in enhancing speech reconstruction at low rates. Waveform interpolation (WI) coders afford a wider time‐frequency footprint for the representation of the excitation, showing a good potential for achieving toll quality at bit rates below 4 kbit/s." @default.
- W1676371511 created "2016-06-24" @default.
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- W1676371511 date "2003-04-15" @default.
- W1676371511 modified "2023-10-13" @default.
- W1676371511 title "Low‐Bit‐Rate Speech Coding" @default.
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- W1676371511 doi "https://doi.org/10.1002/0471219282.eot357" @default.
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