ANALOG AND DIGITAL SIGNALS

SIMPLE PERIODIC ANALOG SIGNALS

A sine wave can be represented by three parameters: the peak amplitude, the frequency, and the phase.

peak amplitude

Period and Frequency

Time Domain

Frequency Domain

COMPOSITE SIGNALS

Time Domain

Frequency Domain

non-periodic COMPOSITE SIGNAL

BANDWIDTH

Fig: Bandwidth of periodic composite signal

Fig: Bandwidth of non-periodic composite signal

Q) If a periodic signal is decomposed into five sine waves with frequencies of 100, 300, 500, 700, and 900 Hz. what is its bandwidth? Draw the spectrum, assuming all components have maxi mum amplitude of 10 V.Solution:-

Q)A non-periodic composite signal has a bandwidth of 200 kHz, with a middle frequency of 140 kHz and peak amplitude of 20 V. The two extreme frequencies have amplitude of 0. Draw the frequency domain of the signal.Solution:-

TRANSMISSION MODES

Parallel Transmission

Serial Transmission

Asynchronous Transmission

Synchronous Transmission

Type of Communication Systems1) Simplex2) Full Duplex3) Half Duplex

TRANSMISSION IMPAIRMENT

Attenuation

Distortion

Noise