Bandwidth compression system in phonetic sound spectrum

Claim 1

Signal conversion system of complex combinations of groups of signals distributed along a plurality of channels comprising a plurality of coupling means from the signals of said channels to a matrix of signal-regouping combinations, each combination having been prearranged for a specific signal regrouping under control of a control signal derived from a signal appearing at a specific location along said channels; a plurality of coupling means from the signals of said channels to a plurality of signalamplitude-threshold sensing means, for deriving sensing signals; a plurality of AND gates; coupling means from said sensing signals to the first inputs of said AND gates; a sequentially operated pulse distributor having plurality of outputs, and a reset control input; coupling means from the distributor outputs to the second inputs of said AND gates, whereby only those AND gates which have received sensing signals at their first inputs operate by the distributor pulses; coupling means from the AND gates to a first plurality of one-shots; a plurality of set-reset flip-flops having first and second inputs for set and reset operating states, and said set operating states representing the control signals of said signals appearing along the channels; coupling means from said first plurality of one-shots to the set inputs of said flip-flops; a second plurality of one-shots operating in shorter pulse periods than said first plurality of one-shots; coupling means from the set operating states of said flip-flops to the second plurality of one-shots, coupling means from the set operating states of said plurality of flip-flops to said matrix for operation of specific signal-regrouping combinations; first mixer means for mixing the pulses of said first plurality of one-shots, and means for applying these mixed pulses to the reset control input of said distributor, whereby to effect reset of the distributor each time signal regrouping is established; second mixer means for mixing the pulses of the second plurality of one-shots, and means for applying these mixed pulses in parallel to the reset inputs of said flip-flops for reset operation except the flip-flop that has last operated in set state due to reason of its longer pulse duration than the pulse duration of the last operated one-shot of the second plurality of one-shots, and thereby holding said signal regrouping undisturbed until the following operation of signal regrouping is recycled.