μ-Law G.711 datastream, discounting the effects of protocol overhead: Generally, speech coding involves a trade-off of different aspects including bit-rate, speech quality, delay (frame size and lookahead), computational complexity, robustness to different speakers and languages, robustness to different background noises, channel error robustness, and also codec state recovery in the face of packet loss. Since the MELPe's lower rates (600 and 1200 bit/s) are supersets of the 2400 bit/s rate, the algorithm complexity (e.g. in MIPS) is about the same for all rates. The lower rates use increased frames and lookahead, as well as codebook size, therefore they require more memory. Intellectual property rights MELPe (and/or its derivatives) is subject to IPR licensing from the following companies, Texas Instruments (2400 bit/s MELP algorithm / source code), Microsoft (1200 bit/s transcoder), Thales Group (600 bit/s rate), Compandent, and AT&T (Noise Pre-Processor NPP). See also CVSD LPC-10e FS-1015 FS-1016 Secure Voice Vocoder References Speech codecs