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Conversions I-Data Communication-Lecture Notes, Study notes of Data Communication Systems and Computer Networks

Dr. Bhim Rao Ambedkar UniversityData Communication Systems and Computer Networks

Data Communication is exchange of data between two devices. In computers data exchange is in form of 0 and 1. This course discuss how computer communicate, what is medium and what are expenses. This handout includes: Representation, Analoge, Conversion, Methods, Modulation, Amplitude, Frequency, According

Typology: Study notes

2011/2012

Uploaded on 08/04/2012

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LECTURE #19
Conversions
Analog To Analog Conversion
oRepresentation of Analog information by an Analog signal
oFor Example: Radio
¾Analog To Analog Conversion Methods
Amplitude Modulation (AM)
oAmplitude of carrier signal is changed according to the amplitude of
modulating signal
oFrequency and phase of the carrier remain the same
9AM Bandwidth
Bandwidth of AM signal (modulated signal) = 2 * bandwidth of
modulating signal
Significant spectrum of AM audio = 5 KHz
10 KHz bandwidth for an AM station
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LECTURE

Conversions

 Analog To Analog Conversion

o Representation of Analog information by an Analog signal o For Example: Radio

 Analog To Analog Conversion Methods

 Amplitude Modulation (AM)

o Amplitude of carrier signal is changed according to the amplitude of modulating signal o Frequency and phase of the carrier remain the same

 AM Bandwidth

Bandwidth of AM signal (modulated signal) = 2 * bandwidth of modulating signal Significant spectrum of AM audio = 5 KHz  10 KHz bandwidth for an AM station

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AM Band Allocation

Example 5. We have an audio signal with a BW of 4 KHz. What is the BW needed, if we modulate the signal using AM? Solution :

  • AM signal requires twice the BW of original signal
  • BW = 2 * 4 KHz = 8 KHz

 Frequency Modulation (FM) o Frequency of carrier signal is changed according to the amplitude of modulating signal o Amplitude and Phase of the carrier signal remain constant

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