Microphone
Words are spoken into microphone where the sound waves are changed into electrical impulses.
The resulting weak signals are then sent to the transmitter.
Transmitter
The transmitter is basically composed of three main parts.
1) The Speech Amplifier. which strengthens the electrical impulses
2) The oscillator, which sets up the carrier wave of the transmitter
3) The Modulator. which receives signals from both the oscillator and The then puts the signals from the speech amplifier together on the carrier wave.