Abstract: The invention relates to a multi transcoder for simultaneous coding/decoding of a plurality of traffic channels in a mobile radio communication system. The multi transcoder comprises several digital signal processors for time multiplex coding/decoding of several traffic channels. The invention also relates to a land system in which a switch is provided between the radio equipment of the base stations and transcoder equipment associated therewith.

Abstract: A signal is transmitted to a receiver and is digitalized in signal points (S1). These points are viterbi analyzed in an analyzer with a path memory (PM) having a desired number of states (00, 01, 10, 11) with memory cells (MC). Bit sequences, corresponding to the signal points (S1), are generated and final metric values (m0, m1+g1, m1, m3) for the bit sequences are calculated. In an indicated bit position the best bit sequence, with the smallest final metric value (m2), has a "1", which is the decided bit value. An alternative bit sequence is generated, which is the best bit sequence with the smallest final metric value (m0+g0) under the condition that in the indicated bit position there is bit with the opposite bit value, a "0". The difference between both the final metric values (m0+m0-m2) is a quality factor for the decided bit value "1". The calculation is made in three steps. At a time point metric values (m0, m1, m2, m3) have been calculated for the different states (00, 01, 10, 11).