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Method of reducing the useful bandwidth of bandwidth-limited signals by coding and decoding the signals, and system to carry out the method
Method of reducing the useful bandwidth of bandwidth-limited signals by coding and decoding the signals, and system to carry out the method
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机译:通过对信号进行编解码来减少带宽受限信号的有用带宽的方法及实现该方法的系统
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摘要
The useful bandwidth of a bandwidth-limited input signal (s(t)) is reduced, to obtain a coded signal (q(t)) by forming a combined input and feedback signal, low-pass filtering the combined signal, and passing the low-pass filtered signal through a feedback loop which includes symmetrical frequency-voltage (f/V) conversion, substantial amplification, and voltage-frequency (V/f) reconversion, the reconverted signal being combined with the input signal in a multiplier, the coded output signal being derived from the output of the low-pass filter. Amplification of the amplifier is so high that the bandwidth of the resulting frequency- modulated feedback signal is greater than the bandwidth of the original input signal. The resulting coded signal can be decoded by derived scanning signals which are combined with bandwidth-enhanced coded signals and processed in an inversion matrix for subsequent reconstitution of the original signal.
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