Mechanical ones were built as far back as 100BC.
The Bush Differential Analyzer was a large programmable electromechanical analog computer built starting in 1929.
The famous Norden Bombsight of WW2 was an electromechanical analog computer designed in the 1930s and built through much of the 1950s, when electronic analog computer bombsights replaced it.
Electronic ones were built from the 1930s through the 1970s.
The MIT differential analyzer, an analog computer.
Wediki
A computer modem is made up of various components including a modulator, demodulator, analog-to-digital converter, digital-to-analog converter, signal processor, and a connection interface such as Ethernet or phone line. These components work together to modulate digital data from the computer into analog signals for transmission over a communication medium and then demodulate received analog signals back into digital data for interpretation by the computer.
Analog computers were first made in the late 1920s, Digital computers were first made in the early 1940s.
the first electronic digital computer was made in Ames, IA in 1942. the first analog computer known was made in one of the colony city states of greece in about 100BC.
analog
The first Indian analog computer was assembled in 1950
mechanical computer
No. Sound has to be converted from analog to digital for use by a computer, not the other way around. It is converted to analog so amplifiers and other analog equipment can use it and so you can hear it.
hybrid computer
The first official analog computer was created in 1912 by Arthur Pollen. The computer was designed for use with fire-control systems and ran off electricity.
it was an astronomical calculator. A form of mechanical analog computer. The nordon bombsight was also a form of mechanical analog computer.