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generation of AM signals

 consider the generation of AM signals in the context of AM radio broadcasting as a practical example.

  1. Audio Signal: The first step in generating an AM signal is to obtain the audio signal that contains the desired information. In the case of AM radio, the audio signal is typically a voice or music signal captured by a microphone or obtained from a pre-recorded source.

  2. Carrier Signal Generation: A high-frequency carrier signal is generated using an oscillator. In AM radio broadcasting, the carrier frequency is usually in the medium wave (MW) or the amplitude modulation (AM) band, which spans from 530 kHz to 1710 kHz. The carrier frequency is typically several times higher than the highest frequency component of the audio signal.

  3. Modulation: The audio signal is then used to modulate the amplitude of the carrier signal. This is achieved by multiplying the carrier wave by the instantaneous amplitude of the audio signal at each point in time.

  4. Mixing and Amplification: The modulated signal is mixed with the carrier signal and amplified to an appropriate power level for transmission. This is typically done using electronic components such as mixers and amplifiers.

  5. Antenna and Transmission: The amplified and modulated signal is then fed into an antenna, which radiates the signal into space. The radiated signal carries the modulated audio information.

  6. Reception and Demodulation: At the receiving end, a radio receiver equipped with an appropriate antenna captures the transmitted signal. The receiver then performs demodulation to extract the original audio signal from the received AM signal. This is typically done using a diode detector or an envelope detector.

The demodulated audio signal is further amplified and sent to a speaker or headphones, allowing the listener to hear the original audio content.

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