Sunday, 23 September 2018

COMMUNICATIONS SYSTEMS NOTE

Transmitter(a) It process and encode the information and make it suitable for transmission. (b) The message signal for communication can be analog signals or digital signals.(c) An analog signal can be converted suitably into a digital signal and vice-versa. (d) An analog signal is that in which current or voltage value varies continuously with time.
Communication channel:The medium through which information propagate from transmitter to receiver is called communication channel.

Receiver:It receives and decode the signal. Analog signal:A signal in which current or voltage changes its magnitude continuously with time, is called an analog signal. Digital signal:A signal in which current or voltage have only two values, is called a digital signal. An analog signal can be converted suitable into a digital signal and vice-versa. Modulation:The process of superimposing the audio signal over a high frequency carrier wave is called modulation. Amplitude Modulation:In this type of modulation in which the amplitude of a high frequency carrier wave is varied in accordance with some characteristic of the modulating signal. Band width required for amplitude modulation = twice the frequency of the modulating signal. Frequency modulation:In this type of modulation, the frequency of high frequency carrier wave is varied in accordance to instantaneous frequency of modulating signal. Pulse modulation:In this type of modulation, the continuous waveforms are sampled at regular intervals. Information is transmitted only at the sampling times. Demodulation The process of separating of audio signal from modulated signal is called demodulation.

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