Telecommunication devices convert different types of information like audio, images, video and text into electronic or optical signals. These digitilised signals initially passed through a source encoder. After encoding, the digitized signal is processed in a channel encoder, here some errors are rectified.
These encoded signal is suitable for transmission by modulation onto a carrier wave and may be made a part of a larger signal in a process, known as multiplexing. And this signal is sent into a multiple access transmission channel. After transmission, the above process is reversed at the receiving end and the information is extracted. The device at the receiving end converts the signal back into human comprehensible form. (Examples are voice and movable images on television and words and text on a computer screen).
These encoded signal is suitable for transmission by modulation onto a carrier wave and may be made a part of a larger signal in a process, known as multiplexing. And this signal is sent into a multiple access transmission channel. After transmission, the above process is reversed at the receiving end and the information is extracted. The device at the receiving end converts the signal back into human comprehensible form. (Examples are voice and movable images on television and words and text on a computer screen).
Messages can be sent from sender to a signal receiver i.e., point-to-point transmission, is generally involved in personal communications like telephone conversations and fax messages are the best examples for point-to-point transmissions.
Messages can be sent from sender to many receivers is called as point-to-multipoint transmission, and also known as Broadcasts, these multiform transmissions are generally used in radio and television programs.