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| A pitch synchronous innovation CELP (PSI-CELP) coder for 2-4 kbit/s. | 2 | 0.47 | 1994 |
| Training method of the excitation codebook for CELP | 1 | 0.44 | 1993 |
| Pitch synchronous innovation CELP (PSI-CELP) | 5 | 0.69 | 1993 |
