- #1
ericeng
- 3
- 0
Hello PF. Thanks for reading.
My understanding of Bandwidth in the context in which I learn it (Analogue and Digital Communications) is that it is the spectral width of a signal, BW = f[upper] - f[lower].
However, my lecture notes then define 'fundamental limitations' as,
Bandwidth:
- A measure of "speed"
- When a signal changes rapidly with time, the frequency content (or spectrum) extends over a wide range; i.e. has "large bandwidth"
- The faster data is sent, the more bandwidth it uses (is needed)
This confuses me. I don't get how bandwidth is a measure of speed, other than how frequency in general relates to signals in the time domain. Are the bullet points above factually correct?
How rapidly a signal changes with time only determines at which frequency(s) it lies, not the width of the range of frequencies?
I understand how sending data faster could require more bandwidth; by increasing bandwidth, more simultaneous signals could be sent. But to say that increasing the speed of transmission will result in an increase in bandwidth, I just don't understand that.
Insight is most welcome.
Thanks!
My understanding of Bandwidth in the context in which I learn it (Analogue and Digital Communications) is that it is the spectral width of a signal, BW = f[upper] - f[lower].
However, my lecture notes then define 'fundamental limitations' as,
Bandwidth:
- A measure of "speed"
- When a signal changes rapidly with time, the frequency content (or spectrum) extends over a wide range; i.e. has "large bandwidth"
- The faster data is sent, the more bandwidth it uses (is needed)
This confuses me. I don't get how bandwidth is a measure of speed, other than how frequency in general relates to signals in the time domain. Are the bullet points above factually correct?
How rapidly a signal changes with time only determines at which frequency(s) it lies, not the width of the range of frequencies?
I understand how sending data faster could require more bandwidth; by increasing bandwidth, more simultaneous signals could be sent. But to say that increasing the speed of transmission will result in an increase in bandwidth, I just don't understand that.
Insight is most welcome.
Thanks!