Method and apparatus for the transmission of time discrete signals between systems operating at different sampling rates

Apparatus for transmitting first and second time discrete signals between source and sink systems wherein a first signal x(n) is generated by said source system at a first sampling rate f.sub.i and a second time discrete signal y(m) is generated by said sink system at a second sampling rate f.sub.0 which is different from the first sampling rate f.sub.i, comprising:

• L filter groups, each of said L filter groups including M filter elements having the transfer function H.sub.l,m (z.sup.LM), where L and M are integers, l is an integer 0, 1, . . . L-1 corresponding to the filter group in which the filter element is located and m is an integer 0, 1, . . . M-1 corresponding to the location of the filter element in its associated filter group, the inputs of the filter elements of each filter group being connected together to a common terminal;
• a first multiplexer switch for cyclically distributing said first time discrete signal x(n) to the common terminals of each of said L filter groups at said first sampling rate f.sub.i, each of said M filter elements filtering said first time discrete signal at a processing rate f.sub.i /L and holding the filtered signal;
• a summing element having L inputs and an output;
• and
• a plurality of L second multiplexer switches, each of said second multiplexer switches cyclically sampling the outputs of the M filter elements in a respective one of said L filter groups at said second sampling rate f.sub.0 and coupling said outputs to a corresponding input of said summing element, said second time discrete signal y(m) having a sampling rate f.sub.0 =M/L f.sub.i being generated at the output of said summing element.