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- W2024882720 abstract "Two types of speech compression systems which use a set of precalculated inverse filters (the inverse filter codebook) are studied. The information theoretic ideas of universal coding and block quantization motivated the use of the inverse filter code-book. The first system finds the indices of the best matching inverse filter, the gain and the pitch interval for each frame of the input speech signal. In this case, a system operating at 800 bit/s for speech sampled at 8 kHz is adopted as the basic system. The second system is a waveform encoder which uses the inverse filter code-book and tree searching. The system uses a single tree search, which is an improved version of the parallel tree search presented by the author, and a system of 8,875 bit/s is adopted as the basic device. Application of the inverse filter codebook is effective in achieving rate reduction and/or decreasing the system complexity. The first system falls into the class of vocoders and the second is a waveform encoder. The data rates of the two differ considerably, yet both types of systems are necessary. An example explaining this fact is also given in the text." @default.
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- W2024882720 title "Two types of speech compression systems using inverse filter codebook" @default.
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- W2024882720 doi "https://doi.org/10.1002/ecja.4410640805" @default.
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