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Analog-to Analog Conversion

Analog-to Analog Conversion. Amplitude Modulation Frequency Modulation Phase Modulation. Analog To Analog Conversion. Representation of Analog information by an Analog signal For Example: Radio. Analog To Analog Conversion. Analog To Analog Conversion Methods. Amplitude Modulation (AM).

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Analog-to Analog Conversion

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  1. Analog-to Analog Conversion • Amplitude Modulation • Frequency Modulation • Phase Modulation

  2. Analog To Analog Conversion • Representation of Analog information by an Analog signal • For Example: Radio

  3. Analog To Analog Conversion

  4. Analog To Analog Conversion Methods

  5. Amplitude Modulation (AM) • Amplitude of carrier signal is changed according to the amplitude of modulating signal • Frequency and phase of the carrier remain the same

  6. Amplitude Modulation (AM)

  7. 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

  8. AM Bandwidth

  9. AM Band Allocation

  10. Example 5.18 • 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

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

  12. Frequency Modulation (FM)

  13. FM Bandwidth • Bandwidth of FM signal (modulated signal) = 10 * bandwidth of modulating signal • Significant spectrum of FM audio = 15 KHz  Minimum 150 KHz bandwidth

  14. FM Bandwidth

  15. FM Band Allocation

  16. Example 5.19 • We have an Audio signal with a BW of 4 MHz. What is the BW needed if we modulate the signal using FM? • Solution: • BW = 10 * 4 MHz = 40 MHz

  17. Phase modulation (PM) • Simpler hardware requirements • Phase is modulated with the amplitude • Amplitude & Frequency of the carrier signal remain constant

  18. Figure 5.20 Phase modulation

  19. Conversion Methods

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