Data Communication Unit 1
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This document discusses analog and digital signals. It describes the parameters that define simple periodic analog signals like sine waves. It also discusses composite signals, which are made up of multiple sine waves, and how they appear in the time and frequency domains. The document provides examples of calculating the bandwidth of periodic and non-periodic composite signals. It concludes with discussing transmission modes for communicating signals, including parallel, serial, asynchronous and synchronous transmission. It also covers types of communication systems and transmission impairments.
Data Communication Unit 1
- 1. ANALOG AND DIGITAL SIGNALS
- 2. SIMPLE PERIODIC ANALOG SIGNALS A sine wave can be represented by three parameters: the peak amplitude, the frequency, and the phase.
- 3. peak amplitude Period and Frequency
- 8. BANDWIDTH Fig: Bandwidth of periodic composite signal Fig: Bandwidth of non-periodic composite signal
- 9. 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 maximum amplitude of 10 V. Solution:-
- 10. 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:-
- 16. Type of Communication Systems 1) Simplex 2) Full Duplex 3) Half Duplex
- 18. Attenuation
- 19. Distortion
- 20. Noise