Telephony is voice communication between remote parties over telecommunications networks. Long distance or telephony is done with telephones that convert the speech into electrical signals that are then transmitted over the telephone network
TelephonyBecause of the high redundancy of
human speech, people use as small afrequency band
as possible for reasons of frequencyeconomy. For the bandwidth of the frequency band, the speech recognizability of the subscribers and a sufficient sentence and syllable intelligibility were decisive. This is 3.1 kHz, in the frequency range from 300 Hz
to 3.4 kHz.
Using speech memories, speech communication can also be time-delayed.