| 摘要 |
Digital signals for transmission and/or storage are encoded by an encoder comprising an analysis filter bank for converting each digital signal into a plurality of subband signals. Some or all of the subband signals are upsampled to produce a plurality of signals each having a frequency spectrum in which segments are duplicated, each duplicate segment having a bandwidth no greater than a prescribed bandwidth of a transmission channel or storage means. The encoder selects one of the duplicates for each subband upsampled and time division multiplexes the selected duplicates to form an encoded signal for transmission or storage. Following reception/extraction, the encoded signal is decoded by a decoder which downsamples the received encoded signal at a rate that corresponds to that used by the encoder to upsample the subband signals, demultiplexes the downsampled signal to provide a plurality of received subband signals corresponding to the subband signals in the encoder, and processes the subband signals in a synthesis filter bank to form a reconstructed decoded signal corresponding to the digital input signal.
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