Coding level changing method for constant rate data transmission over air interface, e.g. for GSM AMR codec, involving modification of rule used to determine need for new level

摘要

For a fixed, non-zero time interval (Tmin) the passage from a level of coding of rank m, where 0 = m less than n-1 and n-1 corresponds to a minimum protection, to rank m+q, where 0 less than m+q = n-1 and q is positive, is prevented when the received signal quality corresponds to a coding level of m+q. The loss of quality arising from a sub-optimal choice of coding level is compensated by preserving frames which would otherwise be lost.