Improved coding system for digital transmission compression

摘要

An improved coding system (fig. 1) for digital compression applicable as a digital compression algorithm for increasing the bandwidth of telecommunications and broadcasting network. The system operates in the transmission regime, not in a baseband (source) so that a transmission channel having a capacity of Mbits/s can deliver Nbit/s channel, where N bits in parallel are combined to the delivered in the 1 Mbit/s channel. The system includes the steps of simultaneously encoding (2) a first group of parallel binary bits (1a-1d) into a digitized voltage amplitude signal in a predetermined bit interval, modulating a carrier with the digitized voltage amplitude signal, transmitting the modulated carrier (fig. 2) over a bandwidth limited communication highway having intrinsic noise therein, demodulating said modulated carrier signal and receiving said digitized voltage amplitude signal, said demodulating means (fig. 3) substantially cancelling said intrinsic noise and improving said output signal noise ratio; and decoding (5 fig. 1) the digitized voltage amplitude signal received in the predetermined bit interval into a second group of parallel binary bits which correspond to the first group of parallel binary bits.