### Pi Pyzdek (@therationalpi)

Pi is a professional DSP Engineer and PhD candidate in the Graduate Program in Acoustics at Penn State with a BSEE from the University of Arizona. As a writer for the Acoustics Today magazine, he wrote "The World Through Sound," an online article series sharing concepts in acoustics to a non-technical audience. Pi's signal processing interests include audio, non-uniform arrays, and low-power embedded systems.

## Re: FIR allpass with desired group delay

Okay, so if I understand you correctly, you are looking for an all-pass filter in magnitude, with a fixed group delay over some range of frequencies?Because a constant...

## Re: Noise Characterization

I hope you decided to sell right after you made this post.

## Re: FIR allpass with desired group delay

I think you're over-complicating this in your head. You can do this with a large fixed delay line. Just apply a delay of fs * T samples, where T is your delay in...

## Re: FIR filtering vs linear convolution

Check the values for your index for x[n].In the FIR filter it looks like x is getting indexed backwards, which is why it doesn't match the convolution. Also, in...

## Re: Running Sum filter

I've found formulas in a number of places stated in different ways, but pg 8 in this pdf has it stated pretty simply:https://www.silabs.com/documents/public/application-notes/an118.pdfAs...

## Re: Running Sum filter

I'm also feeling a bit confused here. What do you mean by "filter sampling frequency," and how can it be higher than the input frequency of the ADC? I think there...

## Re: Running Sum filter

Okay, so redoing the math with that:ENOB = IW + 0.5 * log(0.5 * FS / BW) / log(2) [bits]ENOB = 8 + 0.5 * log(0.5 * 30 MHz / 20 kHz) / log(2) [bits]ENOB = 8 + 4.78 [bits]ENOB...

## Re: How to obtain impulse response of a room acoustics

Probably the best description for this is "Linear System Identification," and you will find lots of solutions to this particular question.Here's a frequency domain...

## Re: Running Sum filter

Based on your other post and your information here I agree with AlanTipper that you're getting basically the expected improvement from oversampling. You are currently...

## Re: MSc Digital Audio Engineering Project Idea

To elaborate on the suggestion of derverberation as a research topic.Dereverberation isn't a new topic, the general problem is just under-determined and so there...

## Re: MSc Digital Audio Engineering Project Idea

That's a really broad question, but here are a few things that jump to mind.1. How can you make a stable IIR filter that approximates the sound of a given FIR...

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