- #1
beckett
- 11
- 0
Hi folks,
quick question, i have just read a small snippet on data transfer that has sparked some thoughts. Basically it was this:
Baseband transmission, one carrier frequency is used and the electrical signal is applied directly to the wires.
Broadband transmission, signal is sent by modulating a carrier (eg amplitude or frequency etc).
Now, if for example i am connected to an earthed wire and i raise and lower the voltage on the point of connection to represent a sequence of 0's and 1's what exactly is going on? Would this be considerered as amplitude modulation of some sort, what frequencies are involved, what is the signal exactly. I can understand modulating a certain frequency and sending this over the air where it may then be demodulated and useful info is extracted but i can't grasp what is going on in a wire using voltage changes as a means for information transmission.
Thanks in advance
quick question, i have just read a small snippet on data transfer that has sparked some thoughts. Basically it was this:
Baseband transmission, one carrier frequency is used and the electrical signal is applied directly to the wires.
Broadband transmission, signal is sent by modulating a carrier (eg amplitude or frequency etc).
Now, if for example i am connected to an earthed wire and i raise and lower the voltage on the point of connection to represent a sequence of 0's and 1's what exactly is going on? Would this be considerered as amplitude modulation of some sort, what frequencies are involved, what is the signal exactly. I can understand modulating a certain frequency and sending this over the air where it may then be demodulated and useful info is extracted but i can't grasp what is going on in a wire using voltage changes as a means for information transmission.
Thanks in advance
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