FREQUENCY MODULATION COMMUNICATION SYSTEM

摘要

The frequency modulation communication system modifies the frequency spectrum of transmission signals in transmission and reception so as to allow them to have desired characteristics, equivalently improves the signal-to-noise ratio (S/N ratio) and consequently improves the articulation of signals particularly associated with speech, thereby enabling a prescribed frequency band to be prominently compressed. For modification of the frequency spectrum, there are used means for inverting frequency spectra and means for rearranging or interchanging them.