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spx_sig_t *excBuf; /**< High-band excitation */
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spx_sig_t *exc; /**< High-band excitation (for QMF only)*/
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spx_sig_t *res; /**< Zero-input response (ringing) */
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spx_sig_t *sw; /**< Perceptually weighted signal */
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spx_sig_t *target; /**< Weighted target signal (analysis by synthesis) */