Q. Need of Microphone in telephone hand set?
Microphone: For all practical purposes, microphone is transmitter for telephone. The microphone converts acoustical signals in the form of sound pressure waves from caller to electrical signals which are transmitted into telephone net-work through hybrid network. Both microphone and speaker are transducers, as they convert one form of energy into another form of energy. A microphone converts acoustical energy first to mechanical energy and then to electrical energy.