Data reduced speech communication based on non-harmonic constituents - involves analogue=digital converter receiving band limited input signal with digital signal divided into twenty one band passes at specific time

摘要

The signal processing stages appertain to a digital input-side, data-reduced speech signal synthetisation, i.e., the prodn. of a bit-data-minimised spectral range information. The band-limited input signal (IN) is fed to an analogue/digital convertor which cuts out on digital signal transmission. The input-side original telephone signal remains spectrum-related in a scanned, complete, non-bandpass-divided version in extent and phase. In this element (2) is simplified the actual digital connection, viz. the input signal spectrum (LE), as a function of the frequency (f) in a transmission range (fU = 300 Hz up to fO = 3.4 kHz). The connecting element (3) in the signal flow plan describes the signal analysis, e.g., fast-Fourier transformation, filtration, etc., or the recognisable alteration in the presentation of the spectrum (L) as a function of frequency (f). The digital signal at a specific time point is divided with its spectrum into 21 bandpasses. ADVANTAGE - For data-reduced speech communication.