Bessel Filter
real time bessel filter design?
help me please to design a bessel filter using circuit elements with variable cutoff frequency
pl follow the link
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Microsoft Excel is an extremely versatile piece of software. Even though it’s been around for well over 20 years now, it is still under-utilized by most users. Excel has come into such widespread use that people take it for granted, and even many long-time users do not know how to leverage even a small fraction of what it can actually do.
Some of the great “hidden gems” of Excel include its many functions and formulas. Speaking of functions: Excel sported no less than 331 functions last time I counted. Granted, you likely will never need to use many of these unless you are an engineer or are involved in certain types of statistics or high-level math (ever heard of a Bessel function? Excel does that, too – but I will probably never have the need to use it!).
But what is a function? Basically, functions are complex formulas whereby all of that complexity happens “behind the scenes.” As the user, all you need to memorize is the function name and how to set it up properly. Excel does the rest. Using functions always requires typing in the function name and a set of parentheses. The parentheses usually hold one or more arguments, such as cell addresses (e.g., A1 or C3, etc.).
So, what’s a formula, then? Well, formulas are usually combinations of operators (like +, – and = signs), numbers, cell addresses, and sometimes functions themselves. Formulas are needed when there is no specific existing function for what you need, or if you need to combine multiple functions together.
Technical note: to use both formulas and functions properly, always start with a =.
Below, I introduce you to a list of useful Excel formulas that you should know. Each is very useful, and most Excel users will find that these come in very handy:
1. Use a formula with an IF function to evaluate or compare text or numbers within cells:
As an Excel user, you will often want an easy way to compare or evaluate a number in a cell or a range of cells. One way to do this is with an IF function. An IF function tells you whether something is true or false. But, instead of displaying a TRUE or FALSE value as a result, instead it lets you control exactly how the resulting value will look.
For example, the formula:
=IF((A1+B1)>4,”Larger than 4″,”No Dice”)
would display the text “Larger than 4″ if the sum of the values in cells A1 and B1 is larger than 4, but it would return the text “No Dice” if not. Remember, you can substitute the text in this example for anything you want.
2. Evaluate more than one cell at once with OR and AND functions:
The AND and OR functions work similarly to the IF function. However, they return the values TRUE or FALSE depending up the result, rather than text that you specify. Also, unlike the IF function, AND and OR necessarily compare combinations of two or more values at once.
The difference between the AND and OR functions themselves is that (as their names imply): the AND function only returns TRUE if both/all conditions are met, while OR returns TRUE if any one condition is met. Examples:
=AND(A1>1, A1<10) (note: this returns TRUE if the number in A1 is 2, 3, 4, 5, 6, 7, 8 or 9; otherwise, it returns FALSE).
=OR(A1=”Bob”,”B1=”Bob”) (note: this returns TRUE if the text in A1 or the text in B1 (or both) is “Bob.”)
3. Add today’s date to a spreadsheet:
Okay, now for a quick-and-easy one. How do you easily add today’s date to a cell without having to type it in again every day? Simple! Use: TODAY().
Example:
=TODAY() (note: this returns today’s date in a date format, such as DD/MM/YYYY).
The next time you find yourself needing to evaluate one or more values, try the IF, OR and AND functions. And, to add today’s date to a spreadsheet, try the TODAY function. Once you get the hang of these formulas and functions, check out various online resources or Excel’s own Help feature for more information on the full range of formulas and functions available to you.
Get a FREE, printable Excel “functions and keyboard shortcuts” CHEAT SHEET to post next to your computer at: http://www.Untangle-Your-Thoughts.com.
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