Oh nuts. I guess my understanding of the effect was incomplete. I'm not using an all pass filter no, I'm just delaying the entire signal.
Thanks you guys, I'll try with an all pass. On Jun 25, 2016 4:43 PM, "Jon Boley" <j...@jboley.com> wrote: Alan, I'm on a phone and don't have headphones on me, so I haven't listened to your examples yet. However, it sounds like you are applying a broadband delay. Huggins pitch typically works when you apply a narrowband delay (i.e., with an allpass filter). The pitch corresponds to the frequency that is delayed. So, can you clarify - are you using an allpass filter to delay specific frequencies? - Jon On Jun 25, 2016, at 4:15 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
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