초록

A filter fast Fourier transmultiplexer divides a multi-channel communication signal into single channel communication signals through a cascade of filters and mixers. The output sample rate is maintained at the input sample rate and memory requirements and computations are substantially reduced.

대표청구항 ▼

[ What I claimed is:] [1.] A method of transmultiplexing a multi-channel information signal at a first sample rate into a plurality of selected communication channels at the first sample rate, the method comprising the steps of:(a) commutating the information signal to a first plurality of filters a

[ What I claimed is:] [1.] A method of transmultiplexing a multi-channel information signal at a first sample rate into a plurality of selected communication channels at the first sample rate, the method comprising the steps of:(a) commutating the information signal to a first plurality of filters and commutating a delayed sample of the information signal to a second plurality of filters, each filter of the first plurality of filters corresponding with a filter of the second plurality of filters;(b) summing an output of each filter of the first plurality of filters with an output from the corresponding filter of the second plurality of filters to form a first plurality of summed outputs;(c) summing a scaled output of each of the second plurality of filters with an output of the corresponding filter of the first plurality of filters to form a second plurality of summed outputs;(d) scaling each output of the second plurality of summed outputs by a time varying value;(e) commutating the first plurality of summed outputs to form a first output signal at the first sample rate; and(f) commutating the scaled second plurality of summed outputs to form a second output signal at the first sample rate.