Re: [music-dsp] Trouble Implementing Huggins Binaural Pitch

[Tito Latini]

I think the Ethan's suggestion about the difference between left and
right channel is the answer. We hear sum and difference thanks to the
Natural Binaural Technologies (unknown copyright).

Two seconds of the difference with a (artificial) post-gain of 20 dB
is recorded in the attached huggins-test-diff.ogg (21K).

The used tool is not important, sexprs show the parameters of my test
(from implementation_of_Huggins_binaural_pitch.pdf with freq 280Hz
and sample rate 48kHz):

(dsp! huggins-binaural-pitch (freq amp post-gain (diff-p boolean))
  (with-samples ((wt (* freq *twopi-div-sr*))
 (r (- 1 (* 0.03 0.5 wt)))
 (a1 (* -2 r (cos wt)))
 (a2 (* r r))
 (in (white-noise amp))
 (g (db->lin post-gain)))
(vuglet ((ap (x)
   (biquad x a2 a1 1 1 a1 a2)))
  (maybe-expand in)
  (if diff-p
  (out (* g (- in (ap in
  (out in (ap in))

(bounce-to-disk ("/tmp/huggins-test.wav" :duration 30)
  (huggins-binaural-pitch 280 .5 0 nil))

(bounce-to-disk ("/tmp/huggins-test-diff.ogg" :duration 2 :channels 1
 :header-type "ogg" :data-format "vorbis")
  (huggins-binaural-pitch 280 .5 20 t))


huggins-test-diff.ogg
Description: Binary data
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Re: [music-dsp] Trouble Implementing Huggins Binaural Pitch

[Alan Wolfe]

Someone on the dsp stack exchange mentioned that you could also get this
effect through additive synthesis:
http://dsp.stackexchange.com/questions/31725/trouble-implementing-huggins-binaural-pitch


On Sun, Jun 26, 2016 at 8:25 AM, Ethan Fenn  wrote:

> Keep in mind that windowing (or just using a finite-length sample, which
> is the same as using a rectangular window) is going to smear the FFT
> spectra out, making it hard to draw any conclusion from looking at
> individual bins. I'm guessing you also don't have the tail of the allpass
> filter -- without that it's not strictly true that the magnitudes will be
> preserved.
>
> Another way you could check what's going on is to subtract the two
> channels. If the allpass filter is the only thing going on, you'd expect
> the result to have a very narrow spectrum centered around the target
> frequency. This is because the channels should be in phase at low and high
> frequencies, so you should have cancellation; at the target frequency they
> should be 180 degrees out of phase, so subtraction should yield
> constructive interference.
>
> -Ethan
>
>
>
> On Sun, Jun 26, 2016 at 6:15 AM, Uli Brueggemann <
> uli.brueggem...@gmail.com> wrote:
>
>> I listened to the example at http://www.srmathias.com/huggins-pitch/ and
>> I hear the tones.
>> But a deeper inspection shows that taking the differences of the
>> magnitude responses after FFT results in quite big deviations, even > 10 dB.
>> So it seems that the allpass delays are not really allpasses without
>> influencing the magnitude response.
>>
>>
>> 2016-06-26 3:14 GMT+02:00 Alan Wolfe :
>>
>>> 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"  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  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!
>>> ___
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Re: [music-dsp] Trouble Implementing Huggins Binaural Pitch

[Ethan Fenn]

Keep in mind that windowing (or just using a finite-length sample, which is
the same as using a rectangular window) is going to smear the FFT spectra
out, making it hard to draw any conclusion from looking at individual bins.
I'm guessing you also don't have the tail of the allpass filter -- without
that it's not strictly true that the magnitudes will be preserved.

Another way you could check what's going on is to subtract the two
channels. If the allpass filter is the only thing going on, you'd expect
the result to have a very narrow spectrum centered around the target
frequency. This is because the channels should be in phase at low and high
frequencies, so you should have cancellation; at the target frequency they
should be 180 degrees out of phase, so subtraction should yield
constructive interference.

-Ethan



On Sun, Jun 26, 2016 at 6:15 AM, Uli Brueggemann 
wrote:

> I listened to the example at http://www.srmathias.com/huggins-pitch/ and
> I hear the tones.
> But a deeper inspection shows that taking the differences of the magnitude
> responses after FFT results in quite big deviations, even > 10 dB.
> So it seems that the allpass delays are not really allpasses without
> influencing the magnitude response.
>
>
> 2016-06-26 3:14 GMT+02:00 Alan Wolfe :
>
>> 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"  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  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
>>
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Re: [music-dsp] Trouble Implementing Huggins Binaural Pitch

[Uli Brueggemann]

I listened to the example at http://www.srmathias.com/huggins-pitch/ and I
hear the tones.
But a deeper inspection shows that taking the differences of the magnitude
responses after FFT results in quite big deviations, even > 10 dB.
So it seems that the allpass delays are not really allpasses without
influencing the magnitude response.


2016-06-26 3:14 GMT+02:00 Alan Wolfe :

> 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"  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  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!
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Re: [music-dsp] Trouble Implementing Huggins Binaural Pitch

[Alan Wolfe]

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"  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  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!
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Re: [music-dsp] Trouble Implementing Huggins Binaural Pitch

[Jon Boley]

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  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!
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Re: [music-dsp] Trouble Implementing Huggins Binaural Pitch

[Ethan Fenn]

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  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  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  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 
>>> 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!

 ___
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 music-dsp@music.columbia.edu
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>>>
>>>
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>>
>>
>
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Re: [music-dsp] Trouble Implementing Huggins Binaural Pitch

[Phil Burk]

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  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  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  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
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>>
>>
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Re: [music-dsp] Trouble Implementing Huggins Binaural Pitch

[Alan Wolfe]

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  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  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
>>
>
>
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Re: [music-dsp] Trouble Implementing Huggins Binaural Pitch

[Phil Burk]

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  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
>
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[music-dsp] Trouble Implementing Huggins Binaural Pitch

[Alan Wolfe]

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!
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