15. Apparatus for transmitting human speech in real time over a narrow-band channel, comprising: (a) speech input means for receiving a speech signal; (b) cusp detector means operatively connected to said speech input means for detecting cusps in the energy curve of said speech signal; (c) correlation detector means operatively connected to said cusp detector means for producing an output indicative of the regularity of occurrence of said cusps; (d) synch pulse generating means operatively connected to said cusp detector means and said correlation detector means for generating pulses in synchronism with said cusps when the occurrence of said cusps is substantially regular, and pulses at predetermined intervals when it is not; (e) transform converter means operatively connected to said speech input means and said synch pulse generating means for producing an indication of the approximate frequency and decay rate of at least the most dominant frequency component of said speech signal between two adjacent synch pulses; and (f) transmission means operatively connected to said transform converter means and said correlation detector means for transmitting, for each synch pulse interval, signals indicative of at least the regularity of said cusp occurrence and the approximate frequency and decay rate of said most dominant frequency component.
15. Apparatus for transmitting human speech in real time over a narrow-band channel, comprising: (a) speech input means for receiving a speech signal; (b) cusp detector means operatively connected to said speech input means for detecting cusps in the energy curve of said speech signal; (c) correlation detector means operatively connected to said cusp detector means for producing an output indicative of the regularity of occurrence of said cusps; (d) synch pulse generating means operatively connected to said cusp detector means and said correlation detector means for generating pulses in synchronism with said cusps when the occurrence of said cusps is substantially regular, and pulses at predetermined intervals when it is not; (e) transform converter means operatively connected to said speech input means and said synch pulse generating means for producing an indication of the approximate frequency and decay rate of at least the most dominant frequency component of said speech signal between two adjacent synch pulses; and (f) transmission means operatively connected to said transform converter means and said correlation detector means for transmitting, for each synch pulse interval, signals indicative of at least the regularity of said cusp occurrence and the approximate frequency and decay rate of said most dominant frequency component. 18. The apparatus of claim 15, comprising separate correlation detectors with separate outputs for the low-frequency portion of said speech signal and for the high-frequency portion of said speech signal, said transmission means being arranged to transmit both of said outputs.