Listen effect of group delay on headphones

This experiment is try and listen if adding group delay to sound is audible. Group delay is introduced with allpass filters that do not alter steady state frequency response but introduce group delay for low frequencies. Try piling them up and listen if you can hear transients lose their impact or not, and how about spatial aspect?

Allpass filters and their biquads were generated with VituixCAD.

Press play in the panel at the bottom of the screen. The sound sources and the filter buttons appear once audio is running, which can take a few seconds.

The space bar switches the filters in and out while the sound keeps playing. That A/B is the whole test: the difference is easier to hear as a change than as two things you compare from memory.

Legend:

Sample rate: <waiting audio context>
Audio: <waiting audio context>
Filters:
<waiting audio context>

First allpass filter:

Second allpass filter:

Info

Filters are IIR filters whose biquads were exported from VituixCAD with 48kHz sample rate and "Generic" DSP system.
The filters used are listed below: 







    





	

		

			
More listening tests:

			
		

	




	

		
Credits:

		
Speech sample:

Demonte, Philippa (2019): Speech corpus - example of edited audio: Harvard_L01_S01_0.wav. University of Salford. Media. https://doi.org/10.17866/rd.salford.7857845.v1



Violin sample:

Pätynen, J., Pulkki, V., and Lokki, T., "Anechoic recording system for symphony orchestra," Acta Acustica united with Acustica, vol. 94, nr. 6, pp. 856-865, November/December 2008. [Online IngentaConnect]

https://research.cs.aalto.fi/acoustics/virtual-acoustics/research/acoustic-measurement-and-analysis/85-anechoic-recordings.html



Music:

Happy Clappy Ukulele by Shane Ivers - https://www.silvermansound.com



Music:

MirĂŁ / Lavoura - MM Moods loop, https://bumpfoot.net/foot276.html