has a unique speech coding framework that provides a number of advantages over linear prediction based speech coders such as CELP, RELP, VSELP, LPC-10, etc. IMBETM and AMBE Voice... Compression Hardware and Software are undefeated in 8 consecutive independent performance evaluations. Most CELP (or CELP-based) speech coders make a single determination whether... a result, these vocoders are less complex and require fewer computations than CELP or VSELP. Finally, the Multi-Band Excitation speech coders are easily scaleable to virtually any...

, to out perform CELP and other competitive technologies at under half the data rate. Features Flexibility and Performance Supports Variety of AMBE Vocoder Modes. Flexible bit-rates...

coding, and 2.8 kbps of error correction coding. In addition to DVSI's speech coder, the participants included VSELP, STC, and CELP. The results of this test are shown in Figure 1. In... which results in a number of advantages over linear prediction based speech coders such as CELP, RELP, VSELP, LPC-10, etc. Most CELP speech coders make a single determination... as to whether each speech segment is a periodic (voiced) signal, or a noise-like (unvoiced) signal. One major difference between CELP coders and the MBE speech coder is that the MBE coder...

been to try to maintain adequate voice quality while lowering the bit rate. Generally this effort has focused on techniques commonly referred to as CELP (Code Excited Linear... is used to approximate the speech spectrum and a long-term predictor is used to represent the pitch (i.e. local periodicity) of the speech signal. However in a CELP coder an error signal... at lower rates. In addition the vector search employed in CELP coders (and its many variants) has significantly increased the complexity of these algorithms to as high as 20-50 MIPs. In...

(CS-ACELP), GSM-FR, G.726A (ADPCM), FS-1016 (CELP) and FS-1015 (LPC), are shown for comparative purposes. All test conditions in Figure 1 used flat-weighted speech where all input...