Based on the provided reference, in amplitude modulation (AM), the amplitude of the carrier wave varies in accordance with the frequency of the carrier wave.
The reference states:
In amplitude modulation, the amplitude of the carrier wave varies in accordance with. frequency of carrier wave. frequency of modulating signal.
According to this specific information, the variation in the carrier wave's amplitude in AM is tied to both the frequency of the carrier wave itself and the frequency of the modulating signal, with particular emphasis placed on the frequency of the carrier wave.
Understanding Amplitude Modulation
Amplitude Modulation is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. The fundamental idea is to embed the information (the modulating signal) into the carrier wave by changing its amplitude.
In the standard understanding of AM:
- The amplitude of the carrier wave is made proportional to the instantaneous amplitude of the modulating signal.
- The frequency of the carrier wave remains constant.
- The frequency of the modulating signal determines the rate at which the carrier's amplitude changes and affects the resulting bandwidth.
Factors Mentioned in the Reference
The reference highlights the dependence on:
- Frequency of carrier wave: Stated as a factor the carrier amplitude varies in accordance with.
- Frequency of modulating signal: Also mentioned as influencing the variation.
This contrasts with the typical explanation which focuses on the modulating signal's amplitude as the primary driver of the carrier wave's amplitude variation.
Components Involved in AM
| Component | Standard Role in AM Transmission | Role as described by Reference |
|---|---|---|
| Carrier Wave | High frequency, constant amplitude/frequency | Varies in amplitude |
| Modulating Signal | Information (audio, data, etc.) | Causes carrier amplitude variation |
| Modulated Wave | Resulting AM signal | - |
How AM is Used
AM is a simple and widely used modulation scheme, particularly for broadcasting. AM radio stations use this method to transmit audio signals over long distances. The varying amplitude of the radio wave carries the sound information, which receivers can then decode.
The reference provides a specific perspective on the factors influencing the amplitude variation in this process, emphasizing the link to the frequency of the carrier wave.
