kirubanithi
- 11
- 0
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
- Thread starter kirubanithi
- Start date
-
- Tags
- Fm
Join the discussion
Ask a follow-up here, or get your own question answered by working scientists, mathematicians and engineers — people, not an autocomplete.
Real named experts · corrections over time · the nuance an AI answer skips
4 replies · 3K views
waht
- 1,502
- 4
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.
- 4,079
- 41
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.
kirubanithi
- 11
- 0
- 4,079
- 41
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.