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Re: AUDITORY Digest - 17 Aug 2009 to 18 Aug 2009 (#2009-187)

To: AUDITORY@xxxxxxxxxxxxxxx
Subject: Re: AUDITORY Digest - 17 Aug 2009 to 18 Aug 2009 (#2009-187)
From: Matthew Reynolds <Matthew.Reynolds@xxxxxxxxxx>
Date: Wed, 19 Aug 2009 08:17:05 +0100
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Thread-topic: AUDITORY Digest - 17 Aug 2009 to 18 Aug 2009 (#2009-187)

Ranjit,

Its not clear from your description exactly what you mean by the
positive half of he sinusoid period is larger. If by this you just mean
it is a pure 100Hz tone with a larger amplitude above the x-axis then in
effect what you have created is 100Hz tone with DC applied, so your FFT
could be correct. Depending on how you've made the positive half of the
cycle bigger, the tone will have been distorted slightly so other
frequencies may be present but chances are these distortions are small
and they could be lost in the FFT due to windowing etc.

The flutter you are hearing could just be down to your setup,
particularly the loudspeaker you are using, reacting badly to the DC
component. DC will mean the point of zero amplitude of the sinusoid will
not be natural resting place of the loudspeaker, so as the drive unit
moves backwards with the negative half of the sinusoid period, at first
the loudspeaker suspension is working with the drive coil, and then as
the loudspeaker cone travels through its mid point suddenly the
suspension is working against the drive unit. While I have never
experienced it personally, this could mean you see some interesting
effects, one of which may be 'flutter'.

Matt

-----Original Message-----
From: AUDITORY - Research in Auditory Perception
[mailto:AUDITORY@xxxxxxxxxxxxxxx] On Behalf Of AUDITORY automatic digest
system
Sent: 19 August 2009 05:06
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Subject: AUDITORY Digest - 17 Aug 2009 to 18 Aug 2009 (#2009-187)

There are 4 messages totalling 573 lines in this issue.

Topics of the day:

1. lopsided tones. (2)
2. Call for Participation - SBCM 2009
3. DSP Research Engineer Position Available

----------------------------------------------------------------------

Date: Mon, 17 Aug 2009 15:41:39 -0400
From: Ranjit Randhawa <rsran@xxxxxxxxxxx>
Subject: lopsided tones.

Dear List,
I have been experimenting with a 100hz tone, where the positive half
sinusoid of the period is larger than the negative, the phase is however

is not changed. Speech seems to have this profile of larger positive
pulses as compared to the negative, hence my interest. Applying fft to
such a signal, I get an increase in magnitude for the 100hz component,
and an increase in the dc component. What I hear however is the basic
100hz tone, and a flutter on top of it, not what fft seems to indicate.
My assumption was that the increased dc component would not be heard,
and I would hear an increase in loudness of the 100 hz. However, the
base 100hz loudness does not seem to change as I increase the area under

the positive sinusoid, but the flutter does. Any history or explanation
would be most welcome.
Thanks and regards,
Randy Randhawa

------------------------------

Date: Tue, 18 Aug 2009 10:09:13 -0300
From: "Regis Rossi A. Faria" <regis@xxxxxxxxxx>
Subject: Call for Participation - SBCM 2009

(Please apologize for cross-postings)

CALL FOR PARTICIPATION

SBCM 2009

The 12th Brazilian Symposium on Computer Music

XII Simp=F3sio Brasileiro de Computa=E7=E3o Musical

http://compmus.ime.usp.br/sbcm/2009

Recife, Brazil, September 7-9, 2009

This year's SBCM will be held in the beautiful city of Recife, on the=20
northeastern
Brazilian coast, featuring high-level technical and musical sessions,=20
keynote talks by
world-renowned guests, and concerts. The program includes:

- Technical Papers
- Music Papers
- Posters presentations
- Invited Talk by Miller Puckette (CRCA/UCSD, USA)
- Invited Talk by Daniel Teruggi (INA/GRM, France)
- Workshops
- Concerts

REGISTRATION
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Discounted registration fees are available until August 21st (Friday).
For online registration, visit
http://compmus.ime.usp.br/sbcm/2009/english/registration.html
(for Brazilians:=20
http://compmus.ime.usp.br/sbcm/2009/portugues/inscricao.html).

PROGRAM
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

The program will include 10 Technical Papers, 5 Music Papers, 9 posters,
3 concerts, 2 panels, 2 invited talks, and a workshop (tutorial). The
topics of the technical sessions will cover:

* Acoustics, Diffusion, Sonorization
* Artificial Life and Evolutionary Music Systems
* Audio Digital Signal Processing
* Computer-Aided Music Analysis
* Computer-Aided Musicology
* Internet and Web Applications
* Movement and Gesture
* Multimedia Systems and Applications
* Music Information Retrieval
* Psychoacoustics and Cognitive Modeling
* Real-time Interactive Systems
* Software Systems and Languages for Composition
* Sound Synthesis

FURTHER INFORMATION
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Participants flying GOL Airlines from anywhere in Latin America
to Recife get 20% off on the purchase of the tickets. For further
information, including the list of accepted papers, please visit the
symposium home page at http://compmus.ime.usp.br/sbcm/2009.
For questions about registration, local organization and other
inquiries,=

please contact the chairs at sbcm2009@xxxxxxxxxx

--=20
Regis Rossi Alves Faria
regis@xxxxxxxxxx

LSI - Laboratory of Integrable Systems - University of Sao Paulo
Audio Engineering and Coding Center
05508-010 S=E3o Paulo - Brazil
phone: +55 11 3091 5589

Organia Musical Engineering |Audiovisual Technologies
www.organia.com.br
S=E3o Paulo - Brazil
phone: +55 11 3070 9646

------------------------------

Date: Tue, 18 Aug 2009 11:44:18 -0500
From: christopher jette <christopherjette@xxxxxxxxx>
Subject: Re: lopsided tones.

--00504502c070c4ec3104716d3ad4
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

One question of clarification. When you say the positive period of the
waveform is larger, I assume you mean that you are employing a longer
wave
period (read: linear distance in a waveform display), as opposed to
vertical
distance from the zero crossing, in comparison with the negative
section.
Is that correct.

If the wave period is longer, you are creating a period that is of a
different length and therefore not 100Hz, but a slightly different
frequency. My understanding is that he two tones are interfering, hence
the
flutter (sidebands both above and below the 100Hz tone).

Cheers~
Christopher

On Mon, Aug 17, 2009 at 2:41 PM, Ranjit Randhawa <rsran@xxxxxxxxxxx>
wrote:

> Dear List,
> I have been experimenting with a 100hz tone, where the positive half
> sinusoid of the period is larger than the negative, the phase is
however is
> not changed. Speech seems to have this profile of larger positive
pulses as
> compared to the negative, hence my interest. Applying fft to such a
signal,
> I get an increase in magnitude for the 100hz component, and an
increase in
> the dc component. What I hear however is the basic 100hz tone, and a
flutter
> on top of it, not what fft seems to indicate. My assumption was that
the
> increased dc component would not be heard, and I would hear an
increase in
> loudness of the 100 hz. However, the base 100hz loudness does not seem
to
> change as I increase the area under the positive sinusoid, but the
flutter
> does. Any history or explanation would be most welcome.
> Thanks and regards,
> Randy Randhawa
>

--
www.cj.lovelyweather.com
christopherjette@xxxxxxxxx
617.869.3968

--00504502c070c4ec3104716d3ad4
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

One question of clarification. When you say the positive period of the
wave=
form is larger, I assume you mean that you are employing a longer wave
peri=
od (read: linear distance in a waveform display), as opposed to vertical
di=
stance from the zero crossing, in comparison with the negative
section.=A0 =
Is that correct. 
 If the wave period is longer, you are creating a period that is of a
di=
fferent length and therefore not 100Hz, but a slightly different
frequency.=
My understanding is that he two tones are interfering, hence the
flutter (=
sidebands both above and below the 100Hz tone). 
 Cheers~ Christopher <div class=3D"gmail_quote">On Mon, Aug
17=
, 2009 at 2:41 PM, Ranjit Randhawa <<a
href=""> rsran@xxxxxxxxxxx">rsran@xxxxxxxxxxx</a>>
wrote: <blockquote c=
lass=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, 204, 204);
ma=
rgin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Dear List, 
I have been experimenting with a 100hz tone, where the positive half
sinuso=
id of the period is larger than the negative, the phase is however is
not c=
hanged. Speech seems to have this profile of larger positive pulses as
comp=
ared to the negative, hence my interest. Applying fft to such a signal,
I g=
et an increase in magnitude for the 100hz component, and an increase in
the=
dc component. What I hear however is the basic 100hz tone, and a
flutter o=
n top of it, not what fft seems to indicate. My assumption was that the
inc=
reased dc component would not be heard, and I would hear an increase in
lou=
dness of the 100 hz. However, the base 100hz loudness does not seem to
chan=
ge as I increase the area under the positive sinusoid, but the flutter
does=
. Any history or explanation would be most welcome. 

Thanks and regards, 
Randy Randhawa 
</blockquote></div> -- <a
href=""> j.lovelyweather.com">www.cj.lovelyweather.com</a> <a
href=""> stopherjette@xxxxxxxxx">christopherjette@xxxxxxxxx</a> 617.869.3968

--00504502c070c4ec3104716d3ad4--

------------------------------

Date: Tue, 18 Aug 2009 15:28:59 -0500
From: Tao Zhang <Tao_Zhang@xxxxxxxxxxx>
Subject: DSP Research Engineer Position Available

--_000_D0340F82AB98CD4D8AF22F6DAC9EB8E9270C695E6ESTARKEYMAILms_
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

Starkey Laboratories, Inc., an equal opportunity employer and a
recognized =
world leader in providing the highest quality hearing
technology available, has an exciting opportunity for a full-time DSP
resea=
rch engineer at its international headquarters located in
Minnesota, USA. This position is responsible for research and
development o=
f signal processing algorithms for hearing aids.

Qualifications
A Ph.D. degree or equivalent in electrical engineering, computer science
or=
related field is required. Candidates with a Master's
degree in electrical engineering, computer science or related field and
3+ =
years of applicable experience may be considered. Research
experience in hearing aids or cochlear implants is highly desirable.
Resear=
ch experience in audio signal processing algorithms,
psychoacoustics or acoustics is a plus.

Skills

* Proficiency in Matlab is required
* Proficiency in C, C++ or C# is required
* Good verbal and written communication skills are required
* Good interpersonal skills are required
* Advanced knowledge of digital signal processing is required
* Technical leadership in a research project is highly desirable
* Proficiency in statistical analysis is desirable
* Familiarity with typical hearing aid algorithms, such as
multiple-chan=
nel compression, speech enhancement, microphone
array processing, learning algorithms and audio classification
algorithms i=
s a plus

Salary
Salary will be commensurate with experience.

Benefits
Visa Sponsorship, 401k, Employee Stock Ownership Plan, Profit Sharing,
Heal=
th Insurance, and Tuition Reimbursement

Contact

Potential candidates should send a cover letter and a CV to Mr. Tony
Tran u=
sing the following information

Tony Tran

Human Resources

Starkey Laboratories, Inc.

6600 Washington Ave. S.

Eden Prairie, MN 55344

Tel: (952)828-6924

Email: tony_tran@xxxxxxxxxxx<mailto:tony_tran@xxxxxxxxxxx>

Web: www.starkey.com/careers<http://www.starkey.com/careers>

--_000_D0340F82AB98CD4D8AF22F6DAC9EB8E9270C695E6ESTARKEYMAILms_
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<body lang=3DEN-US link=3Dblue vlink=3Dpurple>

<div class=3DSection1>

Starkey Laboratories,
In=
c., an
equal opportunity employer and a recognized world leader in providing
the
highest quality hearing <o:p></o:p>

technology available,
ha=
s an
exciting opportunity for a full-time DSP research engineer at its
internati=
onal
headquarters located in <o:p></o:p>

Minnesota, USA. This
pos=
ition is
responsible for research and development of signal processing algorithms
fo=
r
hearing aids. <o:p></o:p>

<o:p> </o:p>=


Qualifications<o:p></=
o:p>

A Ph.D. degree or
equiva=
lent in
electrical engineering, computer science or related field is required.
Candidates with a Master’s <o:p></o:p>

degree in electrical
engineering, computer science or related field and 3+ years of
applicable
experience may be considered. Research <o:p></o:p>

experience in hearing
ai=
ds or
cochlear implants is highly desirable. Research experience in audio
signal
processing algorithms, <o:p></o:p>

psychoacoustics or
acous=
tics is
a plus.<o:p></o:p>

<o:p> </o:p>

Skills
<o:p></o:p></b=
>

<ul style=3D'margin-top:0in' type=3Ddisc>
<li class=3DMsoNormal style=3D'mso-list:l0 level1
lfo1;text-autospace:none=
'>Proficiency
in Matlab is required<o:p></o:p></li>
<li class=3DMsoNormal style=3D'mso-list:l0 level1
lfo1;text-autospace:none=
'>Proficiency
in C, C++ or C# is required<o:p></o:p></li>
<li class=3DMsoNormal style=3D'mso-list:l0 level1
lfo1;text-autospace:none=
'>Good
verbal and written communication skills are
required<o:p></o:p></li>
<li class=3DMsoNormal style=3D'mso-list:l0 level1
lfo1;text-autospace:none=
'>Good
interpersonal skills are required<o:p></o:p></li>
<li class=3DMsoNormal style=3D'mso-list:l0 level1
lfo1;text-autospace:none=
'>Advanced
knowledge of digital signal processing is required<o:p></o:p></li>
<li class=3DMsoNormal style=3D'mso-list:l0 level1
lfo1;text-autospace:none=
'>Technical
leadership in a research project is highly
desirable<o:p></o:p></li>
<li class=3DMsoNormal style=3D'mso-list:l0 level1
lfo1;text-autospace:none=
'>Proficiency
in statistical analysis is desirable<o:p></o:p></li>
<li class=3DMsoNormal style=3D'mso-list:l0 level1
lfo1;text-autospace:none=
'>Familiarity
with typical hearing aid algorithms, such as multiple-channel
compress=
ion,
speech enhancement, microphone <o:p></o:p></li>
</ul>

array
processing, learning algorithms and audio classification algorithms is a
pl=
us<o:p></o:p>

<o:p> </o:p>=


Salary<o:p></o:p>=


Salary will be
commensur=
ate with
experience. <o:p></o:p>

<o:p> </o:p>

Benefits
<o:p></o=
:p>

Visa Sponsorship,
401k, =
Employee
Stock Ownership Plan, Profit Sharing, Health Insurance, and Tuition
Reimbursement<o:p></o:p>

<o:p> </o:p>

Contact<o:p></o:p>

Potential
candidates should send a cover letter and a CV to Mr. Tony Tran using
the
following information<o:p></o:p>

         &=
nbsp;  Tony
Tran<o:p></o:p>

         &=
nbsp;  Human
Resources<o:p></o:p>

         &=
nbsp;  Starkey
Laboratories, Inc.<o:p></o:p>

         &=
nbsp;  6600
Washington Ave. S.<o:p></o:p>

         &=
nbsp;  Eden
Prairie, MN 55344<o:p></o:p>

         &=
nbsp;  Tel:
(952)828-6924<o:p></o:p>

         &=
nbsp;  Email:
<a
href=""> =
p>

         &=
nbsp;  Web:
<a
href=""> =
</o:p>

<o:p> </o:p>

</div>

</body>

</html>

--_000_D0340F82AB98CD4D8AF22F6DAC9EB8E9270C695E6ESTARKEYMAILms_--

------------------------------

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