Frequency separation within the channel

Sindhu Chowdary

Sindhu Chowdary

@sindhu-chowdary-tDAv1D • Oct 10, 2024
We know that to reduce the interference effects , frequency separation is provided between two channels.

I heard that the channels we are using for a telephonic conversation itself is divided into 2 sub-channels (say forward channel and reverse channel).Forward channel is used for our voice conversation and reverse channel is used for signalling purpose (i.e., between mobile and base station).But here there is no frequency separation between forward and reverse channel.

Then why our conversations are not a bit effected by interference?
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  • Abhishek Rawal

    Abhishek Rawal

    @abhishek-fg9tRh • Jul 3, 2013

    I assume, both frequencies are of different range & detectors in both end are capable of detecting only desired frequency.
    I am not sure about this though, but this seems like simple logic to differentiate signals transmitted in one medium.

    Eg : In air medium millions of signals are transmitted, Wifi of neighbour, FM signals of radio station, Communication signals of a person talking using mobile. Every detector detects only frequency which it is desired to detect. I guess this is how it works.

    However more detailed answer #-Link-Snipped-# can give, as I am not good in communication Engineering.
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  • Harshad Italiya

    Harshad Italiya

    @harshad-ukH5ww • Jul 3, 2013

    I heard that the channels we are using for a telephonic conversation itself is divided into 2 sub-channels (say forward channel and reverse channel).
    I too believe as #-Link-Snipped-# said these two channels must have different frequency and because of that there is no any disturbance in communication.
    Like we have multiple frequency in FM band.
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  • Anand Tamariya

    Anand Tamariya

    @anand-tamariya-DnfjEX • Jul 3, 2013

    Well, there are technologies like TDM (Time division multiplexing) where same frequency can be used for multiple channels.
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  • Jeffrey Arulraj

    Jeffrey Arulraj

    @jeffrey-xA7lUP • Jul 3, 2013

    Even more efficient ones are there

    All above explanations hold good but If you are amazed by just two signals then consider <a href="https://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing" target="_blank" rel="nofollow noopener noreferrer">Orthogonal Frequency Division Multiplexing</a> to be more puzzling than the others

    FDMA and TDMA are the main reasons for this to happen here in any communication channel
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