Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

The frequency of the first harmonic

Status
Not open for further replies.

lomaxe

Member level 1
Member level 1
Joined
Dec 9, 2010
Messages
39
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,288
Location
Ukraine
Visit site
Activity points
1,683
Hi everybody.
Before to ask my question I want to quote from the book named "Computer networks" by Tanenbaum A.

pic.jpg

Given a bit rate of b bits/sec, the time required to send the 8 bits in our example
1 bit at a time is 8/b sec, so the frequency of the first harmonic of this signal
is b/8 Hz. An ordinary telephone line, often called a voice-grade line, has an
artificially introduced cutoff frequency just above 3000 Hz. The presence of this
restriction means that the number of the highest harmonic passed through is
roughly 3000/(b/8), or 24,000/b (the cutoff is not sharp).


The question is: why the author decided that the first harmonic of the signall is b/8 Hz? What is his logic? I don't understand.:lol::oops:
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top