Neat, I had never heard of this illusion before. Nothing I've read mentions simply offsetting one of the channels with a delay. Rather it sounds like one of the channels should have a 180 degree phase offset in a narrow band around the target frequency, implemented via an an allpass filter. This looks like a pretty readable presentation:
http://traktoria.org/files/sonar/binaural-listening/implementation_of_Huggins_binaural_pitch.pdf -Ethan On Sat, Jun 25, 2016 at 7:05 PM, Phil Burk <philb...@mobileer.com> wrote: > It sounds noisier in bursts that probably correspond to the delayed > sections. But I do not hear any tones. > > I tried trimming the bass and treble using an EQ, to mimic the other > online example but no luck. > > I'm out of ideas. > > > On Sat, Jun 25, 2016 at 3:13 PM, Alan Wolfe <alan.wo...@gmail.com> wrote: > >> I tried another experiment. I can "kinda" hear a tone, in that the white >> noise sounds a bit more tonal. >> >> Is this what the effect sounds like? As you point out, it does a filter, >> but it still seems like I'm not getting the actual effect. >> >> What do you think? >> >> http://blog.demofox.org/wp-content/uploads/2016/06/stereonoise2.wav >> >> I did 16 notes. In hertz below: >> 200 >> 0 >> 400 >> 0 >> 300 >> 0 >> 800 >> 0 >> 800 >> 0 >> 300 >> 0 >> 400 >> 0 >> 200 >> 0 >> >> >> On Sat, Jun 25, 2016 at 2:43 PM, Phil Burk <philb...@mobileer.com> wrote: >> >>> Hello Alan, >>> >>> Your WAV file looks like it has the 220 sample offset. But I not hear a >>> 200 Hz tone. >>> >>> I can hear tones faintly in the example here: >>> http://www.srmathias.com/huggins-pitch/ >>> >>> 200 Hz seems like a low frequency. You might have better luck with >>> frequencies around 600 like in the Python example. >>> >>> The Python also uses a bandwidth filter to make the sound less harsh. >>> >>> Also I did not hear the tone until I noticed the melody. Try playing a >>> simple melody or scale. >>> >>> Phil Burk >>> >>> >>> On Sat, Jun 25, 2016 at 2:08 PM, Alan Wolfe <alan.wo...@gmail.com> >>> wrote: >>> >>>> Hey Guys, >>>> >>>> I'm trying to make an implementation of the Huggins Binaural Pitch >>>> illusion, which is where if you play whitenoise into each ear, but offset >>>> one ear by a period T that it will create the illusion of a tone of 1/T. >>>> >>>> Unfortunately when I try this, I don't hear any tone. >>>> >>>> I've found a python implementation at >>>> http://www.srmathias.com/huggins-pitch/, but unfortunately I don't >>>> know python (I'm a C++ guy) and while I see that this person is doing some >>>> extra filtering work and other things, it's hard to pick apart which extra >>>> work may be required versus just dressing. >>>> >>>> Here is a 3 second wav file that I've made: >>>> >>>> http://blog.demofox.org/wp-content/uploads/2016/06/stereonoise.wav >>>> >>>> The first 1.5 seconds is white noise. The second half of the sound has >>>> the right ear shifted forward 220 samples. The sound file has a sample rate >>>> of 44100, so that 220 sample offset corresponds to a period of 0.005 >>>> seconds aka 5 milliseconds aka 200hz. >>>> >>>> I don't hear a 200hz tone though. >>>> >>>> Can anyone tell me where I'm going wrong? >>>> >>>> The 160 line single file standalone (no libs/non standard headers etc) >>>> c++ code is here: >>>> http://pastebin.com/ZCd0wjW1 >>>> >>>> Thanks for any insight anyone can provide! >>>> >>>> _______________________________________________ >>>> dupswapdrop: music-dsp mailing list >>>> music-dsp@music.columbia.edu >>>> https://lists.columbia.edu/mailman/listinfo/music-dsp >>>> >>> >>> >>> _______________________________________________ >>> dupswapdrop: music-dsp mailing list >>> music-dsp@music.columbia.edu >>> https://lists.columbia.edu/mailman/listinfo/music-dsp >>> >> >> > > _______________________________________________ > dupswapdrop: music-dsp mailing list > music-dsp@music.columbia.edu > https://lists.columbia.edu/mailman/listinfo/music-dsp >
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