Why is it difficult to transmit audio signals directly ?
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Your answer :
I know that why we use Carrier of high frequency to send message signal over a long distance, when the frequency is low , energy will be obviously low. To increase the energy of the signal we need to increase the frequency. This is achieved by multiplying the message signal with the carrier signal (with high frequency).
Your answer :
I know that why we use Carrier of high frequency to send message signal over a long distance, when the frequency is low , energy will be obviously low. To increase the energy of the signal we need to increase the frequency. This is achieved by multiplying the message signal with the carrier signal (with high frequency).
Answered by
0
There are many reasons for this, mainly:
1)A digital signal, consisting of 0s and 1s has infinite bandwidth, since it is composed of rectangular signals with very small rise and fall times. To transmit such a signal, you would need a channel with infinite bandwidth, which doesn't exist. Not to mention the interference effects such a system would cause.
2)Unless your transmitted signal is of a few Gigahertz, the antenna size of your application would be really large. All microwave devices have finite bandwidth again and can't handle these rectangle-type pules. (Assuming wireless transmission)
If you still force your way and try to send such signals, you would get something called ISI (inter-symbol interference), which essentially means you've lost your signal.
1)A digital signal, consisting of 0s and 1s has infinite bandwidth, since it is composed of rectangular signals with very small rise and fall times. To transmit such a signal, you would need a channel with infinite bandwidth, which doesn't exist. Not to mention the interference effects such a system would cause.
2)Unless your transmitted signal is of a few Gigahertz, the antenna size of your application would be really large. All microwave devices have finite bandwidth again and can't handle these rectangle-type pules. (Assuming wireless transmission)
If you still force your way and try to send such signals, you would get something called ISI (inter-symbol interference), which essentially means you've lost your signal.
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