The present invention is directed to a system of digital transmission that has a transmitter and a receptor the transmitter includes encoder and a receptor and includes a coder for coding in the subbands of a digital signal as a signal of digital audio signal which has one of sampling rate FS given the encoder responsive to the digital signal for generating a number m of signals of subbands with reduction of the rate of sampling the encoder inhibits the belt of the speed of sampling the encoder inhibited band of the digital signal in the sub-band with successive numbers of band m (1 m m) which is increased with the frequency the encoder is responsive to the signals of sub-band m for building a replica of the original signal the decoder performs a merger of the subbands for building a replica of the digital signal with increase of the speed sampling characterized because the encoder comprises means for filtering by analysis and the unit of processing of a signal the means of filtering by analysis comprises m by analysis filters each one of which has an inlet and two outlets the outlets of the filters 2 M is coupled with the output of the means 2 M of filtering by analysis for sending 2 M of output signals with a rate of sampling FS/M each filter by examination is adapted for applying two different to the filtered signal which is applied to its input and for supplying each one of the two filtered versions different to that of input signal to the corresponding of the two outputs each one of the output of filter 2 M is coupled with the two inputs of m na of processing unit of signal the unit OF processing has m outputs that is coupled with m outputs from the encoder for supplying the signals of m sub-band the unit of processing of signal is adapted for supplying the signals of output on each one of the m outputs one of output signal on each one of the m outputs signal of a combination of by the less number of signals of input that is applied to its 2 M inputs the decoder comprising of another unit of signal processing and means of filtering by synthesis another unit of the processing of signal has two inputs and an output coupled to the output of decoder another unit of the processing of signal of decoder is adapted for generating a signal of output in a combination of by the less of a certain number of input signals applied to its inputs m Each pair of outputs of the other unit of processing of signal is coupled with a pair of two of the inputs of the corresponding m of synthesis filters each filter of synthesis has an output.