Standard MELP vocoder 2400 bps
Low bit rate MELP (Mixed Excitation Linear Prediction) speech coder with rate 2400 bps uses classical parametric model of description of speech signals. This model is implemented on the base of linear prediction filter with mixed excitation in several frequency bands.
Independent estimation of voiced/unvoiced decision in different frequency bands is providing more natural synthetic speech sounding then quality of classical LPC vocoders with binary voiced/unvoiced decision for single band.
The full list of transmitting bits is presented in table:
More precise description of standard MELP 2400 bps algorithm
you can find here:
Standard MELP 2400 bps vocoder has fixed-point ANSI-C model for PC and real-time implementation on the base of DSP TMS320C54x. Real-time implementation on the base of DSP TMS320C55x will be done on demand. Please ask for it.
Standard MELP 2400 bps TMS320C54x implementation
where N - number of simultaneously working channels
Here you can test speech quality of standard MELP 2400 bps algorithm by listening following speech samples:
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