Analog to analog conversion - Amplitude modulation
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Analog to analog conversion modulation involves varying properties of a carrier signal with a modulating signal to transmit information. This is essential for bandpass mediums using filters that allow certain frequencies while blocking others. Amplitude modulation (AM) changes the amplitude of the carrier wave according to the modulating signal's intensity and is simple to implement, requiring minimal components for demodulation.
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Analog to analog conversion - Amplitude modulation
- 2. MODULATION process of varying one or more properties of a periodic waveformcarrier signal, with a modulating signal that contains information to be transmitted.
- 3. WHY TO MODULATE ANALOG SIGNAL? Modulation is needed . . . • If the medium is Bandpass in nature. • BANDPASS - the range of frequencies which are transmitted through a bandpass filter.
- 4. BANDPASS FILTER • An electronic device or circuit. • Allows signals between two specific frequencies to pass. • Prevents signals at unwanted frequencies. • Example – Radio.
- 5. ANALOG ANALOG CONVERSION • Analog signals are modified to represent analog data. • Also known as Analog Modulation. • Required when BANDPASS is used.
- 6. TYPES
- 7. AMPLITUDE MODULATION • Process of changing the amplitude of high frequency carrier wave in accordance with intensity of signal is called AM. • amplitude of the carrier wave : amplitude of the signal being modulated.
- 9. WHY WE NEED MULTIPLIER ? • Has two analog inputs . • Output proportional to the product of the two amplitudes • Ex. MICROPHONES
- 10. VIDEO
- 11. AMPLITUDE MODULATION • If the modulation signal frequency increases, the amplitude of the carrier changes at a greater rate. • B AM =2 B • BAND WIDTH of AM Signal = TWICE the BANDWIDTH of MODULATING Signal.
- 12. ADVANTAGES • It is simple to implement. • It can be demodulated using a circuit consisting of very few components.