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.

1. ANALOG TO ANALOG
CONVERSION

2. MODULATION
process of varying one or more properties
of a periodic waveformcarrier 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.

8. AMPLITUDE MODULATION

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.