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A male voice after modulation-transmissi...

A male voice after modulation-transmission sounds like that of a female to the receiver. The problem is due to

A

poor selection of modulation index (selected `0ltmlt1`)

B

poor bandwidth selection of amplitudes

C

poor selection of carrier frequency

D

loss of energy in transmission

Text Solution

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The correct Answer is:
To solve the problem of why a male voice sounds like a female voice after modulation and transmission, we can analyze the options provided. ### Step-by-Step Solution: 1. **Understanding Voice Frequencies**: - Male voices typically have lower frequencies compared to female voices. This is an important aspect to consider when modulating and transmitting audio signals. 2. **Modulation Process**: - During modulation, the original audio signal (the voice) is combined with a carrier wave. The modulation process can affect the frequency characteristics of the original signal. 3. **Effect of Modulation on Frequency**: - If the modulation is not done correctly, the frequency of the modulated signal can shift. This means that a male voice, which has a lower frequency, could be perceived as having a higher frequency (similar to a female voice) at the receiver's end. 4. **Analyzing the Options**: - **Option 1: Poor selection of modulation index**: The modulation index affects the amplitude of the modulated signal but not the frequency characteristics directly. - **Option 2: Poor bandwidth selection of amplitudes**: This option suggests that the bandwidth allocated for the modulated signal is not appropriate, which can lead to distortion and frequency shifting. - **Option 3: Poor selection of carrier frequency**: While the carrier frequency is important, it does not directly cause the male voice to sound like a female voice. - **Option 4: Loss of energy in transmission**: Loss of energy can affect the quality of the signal but does not specifically cause a change in perceived frequency. 5. **Conclusion**: - The most likely cause of the male voice sounding like a female voice after modulation and transmission is due to **poor bandwidth selection of amplitudes**. This can lead to distortion and frequency shifting, resulting in the change in perceived voice characteristics. ### Final Answer: The problem is due to **poor bandwidth selection of amplitudes**. ---
To solve the problem of why a male voice sounds like a female voice after modulation and transmission, we can analyze the options provided. ### Step-by-Step Solution: 1. **Understanding Voice Frequencies**: - Male voices typically have lower frequencies compared to female voices. This is an important aspect to consider when modulating and transmitting audio signals. 2. **Modulation Process**: ...
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