Digital signals need more bandwithd to the same information .
the transmitter and reciver have to sychronise very careful so that the information makes sense. if you start counting halfway through or a digital number you 1011001 where as you should hce recieved 11101100011.
Digitals signal have more bandwidth to carry the same information as a analogue signal. Bamdwitdth is the amount of space on the carrier wave- the range of frequencies ou need to accomadate the carrier wave and the information it is carrying.
However it is possible to compress a digital signal so that it's fits into smaller bandwidth. This is done by only sending the new information, if the image remains the same , no more information is sent, this then saves bandwidth.
Noise gets amplified in analogue signals. In digital the shape of the pulse changed but not the pattern.
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