Impz function fast algorithm?

2016 12 1
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更新时间：2016 12 2
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Does anybody here know what is the code algorithm behind the impz function? I know it uses the recursive algorithm but how is such implemented in impz that it can get the impulse response of very high N and M orders (numerator and denominator coefficients)? I can make a script that gets the impulse response of a second order lccde but I want to know a GENERAL code that can get the impulse response of any lccdes regardless of their order.

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Walter Roberson
Walter Roberson 2016-12-2

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I do not see any evidence that impz uses anything recursive.
The algorithm is described at https://www.mathworks.com/help/signal/ref/impz.html#f7-1073402
You can look at the complete code:
type impz

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Riven Yvet
Riven Yvet 2016-12-2
Thank you! Is there any other way to find the impulse response rather than filter and impz? Can I use freqz?
Walter Roberson
Walter Roberson 2016-12-2
Sorry, I am not not familiar enough with signal processing to know.

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