
Recent Posts
Archives
 January 2017
 December 2016
 September 2016
 February 2016
 September 2015
 January 2015
 March 2014
 January 2014
 October 2013
 June 2013
 May 2013
 April 2013
 March 2013
 February 2013
 December 2012
 November 2012
 May 2012
 March 2012
 January 2011
 December 2010
 November 2010
 July 2007
 March 2003
 February 2003
 August 2002
 January 1997
 November 1996
 October 1996
 August 1996
 July 1996
Categories
 Digital Audio (48)
 Aliasing (8)
 Convolution (3)
 Dither (7)
 Filters (23)
 DC Blocker (1)
 FIR Filters (7)
 IIR Filters (17)
 Biquads (11)
 Fourier (3)
 FFT (3)
 Impulse Response (5)
 Jitter (2)
 Oscillators (8)
 Phase (2)
 Reverb (2)
 Sample Rate Conversion (8)
 Sampling Theory (1)
 Envelope Generators (5)
 MIDI (2)
 Source Code (7)
 Synthesizers (9)
 Uncategorized (5)
 Video (4)
 Widgets (12)
 Digital Audio (48)
Category Archives: FIR Filters
Evaluating filter frequency response
A question that pops up for many DSPers working with IIR and FIR filters, I think, is how to look at a filter’s frequency and phase response. For many, maybe they’ve calculated filter coefficients with something like the biquad calculator … Continue reading
Posted in Biquads, FFT, Filters, FIR Filters, IIR Filters
14 Comments
Convolution—in words
Convolution is a convoluted topic—and that’s what it means (convoluted, from MerriamWebster : “Extremely complex and difficult to follow. Intricately folded, twisted, or coiled.”). Really, it’s more difficult to explain why you would want to use convolution than it is … Continue reading
Posted in Convolution, Digital Audio, FIR Filters, Impulse Response, Reverb
Leave a comment
Sample rate conversion: up
Once we have a suitable set of FIR filter coefficients from our windowed sinc calculator, it’s time to apply them. Again, our recipe for doubling the sample rate: 1) Insert a zero between existing samples. (This is the upsampling step, … Continue reading
Posted in Aliasing, Convolution, Digital Audio, Filters, FIR Filters, Sample Rate Conversion
7 Comments
Towards practical resampling
In a previous article, we looked at sample rate conversion in the frequency domain. Let’s take a quick second look in the time domain as reinforcement of principles behind sample rate conversion, before developing a practical rate convertor. In an … Continue reading