Infinite Impulse Response
Infinite impulse response (IIR) is a property of signal processing systems. Systems with this property are known as IIR systems or, when dealing with filter systems, as IIR filters. IIR systems have an impulse response function that is non-zero over an infinite length of time. This is in contrast to finite impulse response (FIR) filters, which have fixed-duration impulse responses. The simplest analog IIR filter is an RC filter made up of a single resistor (R) feeding into a node shared with a single capacitor (C). This filter has an exponential impulse response characterized by an RC time constant. Because the exponential function is asymptotic to a limit, and thus never settles at a fixed value, the response is considered infinite.
Read more about Infinite Impulse Response: Implementation and Design, Transfer Function Derivation, Description of Block Diagram, Stability, Example, Applications
Famous quotes containing the words infinite, impulse and/or response:
“. . . Me miserable! which way shall I fly
Infinite wrath and infinite despair?
Which way I fly is Hell; myself am Hell;
And, in the lowest deep, a lower deep
Still threatning to devour me opens wide,
To which the Hell I suffer seems a Heaven.”
—John Milton (16081674)
“God once spoke to people by name.
The sun once imparted its flame.
One impulse persists as our breath;
The other persists as our faith.”
—Robert Frost (18741963)
“[In response to this question from an interviewer: U. S. News and World Report described you this way: Shes intolerant, preachy, judgmental and overbearing. Shes bright, articulate, passionate and kind. Is that an accurate description?:]
Its ... pretty good [ellipsis in original].”
—Joycelyn Elders (b. 1933)