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void interpolate(MODEL *interp, MODEL *prev, MODEL *next);
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void interpolate_lsp(kiss_fft_cfg fft_dec_cfg,
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MODEL *interp, MODEL *prev, MODEL *next,
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void interpolate_lsp(MODEL *interp, MODEL *prev, MODEL *next,
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float *prev_lsps, float prev_e,
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float *next_lsps, float next_e,
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float *ak_interp, float *lsps_interp);
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void interp_Wo(MODEL *interp, MODEL *prev, MODEL *next);
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void interp_Wo2(MODEL *interp, MODEL *prev, MODEL *next, float weight);
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float interp_energy(float prev, float next);
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float interp_energy2(float prev, float next, float weight);
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void interpolate_lsp_ver2(float interp[], float prev[], float next[], float weight);
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float resample_amp(MODEL *model, int m);
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float resample_amp_nl(MODEL *model, int m, float Ares_prev[]);