- #1
kirubanithi
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For the Frequency modulation the carrier frequency will change with respect to data. but i need to transmit the modulated carrier at 93.5MHz means what i need to do.
Need clarification about FM demodulation
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In summary, for Frequency Modulation, the carrier frequency can be generated by a VCO and can be varied by adjusting its tuning voltage. The "quiet" frequency of the carrier without any modulation is 93.5MHz. With speech or music, the frequency variation is very small, typically only up to 0.1% of the carrier frequency. This frequency variation is centered around the carrier frequency and is known as Frequency Shift Keying (FSK). The data "0" and "1" can cause a shift of 1 KHz in the carrier frequency, allowing for multiple signals to be transmitted in the same spectrum portion.
- #2
waht
- 1,501
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The carrier frequency can be generated by a VCO (voltage controlled oscillator), all you have to do is to vary its tuning voltage very slightly.
- #3
vk6kro
Science Advisor
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93.5 MHz is the "quiet" frequency of the carrier without any modulation on it.
When there is speech or music, this frequency varies but only over a very small percentage of the carrier frequency.
It may vary up to 100 KHz which is only 0.1% of the carrier frequency.
The frequency variation with modulation is centred about the carrier frequency so it swings up and down by equal shifts.
When there is speech or music, this frequency varies but only over a very small percentage of the carrier frequency.
It may vary up to 100 KHz which is only 0.1% of the carrier frequency.
The frequency variation with modulation is centred about the carrier frequency so it swings up and down by equal shifts.
- #4
- #5
vk6kro
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The frequency does move, but only by a small amount.
A data "0" may be 93.500 MHz while a data "1" may be 93.501 MHz.
This is called Frequency Shift Keying (FSK). In this case, the shift would be 1 KHz.
It could be shifted further, but there might be other signals nearby and if less shift is used, then there can be more signals in the same spectrum portion.
A data "0" may be 93.500 MHz while a data "1" may be 93.501 MHz.
This is called Frequency Shift Keying (FSK). In this case, the shift would be 1 KHz.
It could be shifted further, but there might be other signals nearby and if less shift is used, then there can be more signals in the same spectrum portion.
1. What is FM demodulation?
FM demodulation, also known as frequency demodulation, is the process of extracting the original information signal from a frequency-modulated carrier wave. This is necessary in order to reproduce the original audio or data signal that was transmitted.
2. How does FM demodulation work?
FM demodulation works by using a circuit to detect changes in the frequency of the carrier wave. This circuit then converts the changes in frequency into changes in amplitude, which represents the original information signal. The result is a demodulated signal that can be amplified and reproduced.
3. What are the advantages of FM demodulation?
FM demodulation has several advantages over other methods of modulation, such as AM (amplitude modulation). These include better noise immunity, higher fidelity, and the ability to transmit multiple signals on the same carrier wave using frequency division multiplexing.
4. What are the applications of FM demodulation?
FM demodulation is commonly used in radio and television broadcasting, as well as in wireless communication systems. It is also used in systems that require high-quality audio, such as in music production and recording.
5. How is FM demodulation different from other types of demodulation?
FM demodulation is different from other types of demodulation, such as AM demodulation, because it relies on changes in frequency rather than changes in amplitude. This makes it more resistant to noise and interference, resulting in a higher quality signal. Additionally, FM demodulation allows for a wider range of frequencies to be transmitted on the same carrier wave, making it more versatile for different types of communication.
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