frequency analysis in CoolEdit Pro

[Bob Pit]

Hi

In CoolEdit pro I go to menu Generate->Tones and I insert (what I think it
is) a very clear single frequency. I experimented with 30 Hz, 100 Hz and
320 Hz. But when I go to menu Analyze->[Show Frequency Analysis], in all
cases it shows me frequencies of 344,5 Hz - 689 Hz - 1033 Hz - 1378 Hz......
(they are all multiples of 344,5 Hz). Only the db readings differ.

I thought it was supposed to show me the frequency of the sound segment. ie
30 Hz or 100 Hz or 320 Hz. How can I do this anyway?

Thanks
Bob

[Gerard Bok]

On Tue, 3 May 2005 10:23:19 +0300, "Bob Pit" >
wrote:

>In CoolEdit pro I go to menu Generate->Tones and I insert (what I think it
>is) a very clear single frequency. I experimented with 30 Hz, 100 Hz and
>320 Hz. But when I go to menu Analyze->[Show Frequency Analysis], in all
>cases it shows me frequencies of 344,5 Hz - 689 Hz - 1033 Hz - 1378 Hz......
>(they are all multiples of 344,5 Hz). Only the db readings differ.
>
>I thought it was supposed to show me the frequency of the sound segment. ie
>30 Hz or 100 Hz or 320 Hz. How can I do this anyway?

Don't know about the pro version.
But in Cool Edit 96 the 'tones' window shows a bunch of sliders
to control the harmonics. And a 'modulation' setting.

With all sliders (exept basic) off and 0% modulation I create a
440 Hz sine. Spectral contents show the basic frequency without
any noticable harmonics. (The only noise shown is -96 dB or less)

--
Kind regards,
Gerard Bok

[Ricky Hunt]

"Bob Pit" > wrote in message
news:1115104838.102282@athnrd02...
> Hi
>
> In CoolEdit pro I go to menu Generate->Tones and I insert (what I think it
> is) a very clear single frequency. I experimented with 30 Hz, 100 Hz and
> 320 Hz. But when I go to menu Analyze->[Show Frequency Analysis], in all
> cases it shows me frequencies of 344,5 Hz - 689 Hz - 1033 Hz - 1378
> Hz...... (they are all multiples of 344,5 Hz). Only the db readings
> differ.
>
> I thought it was supposed to show me the frequency of the sound segment.
> ie 30 Hz or 100 Hz or 320 Hz. How can I do this anyway?
>

Do you have it set to sine wave?

[Bob Pit]

> With all sliders (exept basic) off and 0% modulation I create a
> 440 Hz sine. Spectral contents show the basic frequency without
> any noticable harmonics. (The only noise shown is -96 dB or less)

Yes, this is what I am doing. But I still get frequencies in the multiples
of 344,5 Hz and the volume never goes below -63 db.

What can I be doing wrong?

Bob



"Gerard Bok" > wrote in message
...
>
> On Tue, 3 May 2005 10:23:19 +0300, "Bob Pit" >
> wrote:
>
>>In CoolEdit pro I go to menu Generate->Tones and I insert (what I think it
>>is) a very clear single frequency. I experimented with 30 Hz, 100 Hz and
>>320 Hz. But when I go to menu Analyze->[Show Frequency Analysis], in all
>>cases it shows me frequencies of 344,5 Hz - 689 Hz - 1033 Hz - 1378
>>Hz......
>>(they are all multiples of 344,5 Hz). Only the db readings differ.
>>
>>I thought it was supposed to show me the frequency of the sound segment.
>>ie
>>30 Hz or 100 Hz or 320 Hz. How can I do this anyway?
>
> Don't know about the pro version.
> But in Cool Edit 96 the 'tones' window shows a bunch of sliders
> to control the harmonics. And a 'modulation' setting.
>
> With all sliders (exept basic) off and 0% modulation I create a
> 440 Hz sine. Spectral contents show the basic frequency without
> any noticable harmonics. (The only noise shown is -96 dB or less)
>
> --
> Kind regards,
> Gerard Bok

[Bob Pit]

> Do you have it set to sine wave?
Initially I had it set to square. But I get the same strange frequency
analysis with Sine too.

Bob




"Ricky Hunt" > wrote in message
news:LoKde.44487$NU4.41775@attbi_s22...
>
> "Bob Pit" > wrote in message
> news:1115104838.102282@athnrd02...
>> Hi
>>
>> In CoolEdit pro I go to menu Generate->Tones and I insert (what I think
>> it is) a very clear single frequency. I experimented with 30 Hz, 100 Hz
>> and 320 Hz. But when I go to menu Analyze->[Show Frequency Analysis], in
>> all cases it shows me frequencies of 344,5 Hz - 689 Hz - 1033 Hz - 1378
>> Hz...... (they are all multiples of 344,5 Hz). Only the db readings
>> differ.
>>
>> I thought it was supposed to show me the frequency of the sound segment.
>> ie 30 Hz or 100 Hz or 320 Hz. How can I do this anyway?
>>
>
> Do you have it set to sine wave?
>

[Ricky Hunt]

"Bob Pit" > wrote in message
news:1115125086.451992@athnrd02...
>> Do you have it set to sine wave?
> Initially I had it set to square. But I get the same strange frequency
> analysis with Sine too.
>

And you have modulation and everything else set to off? Does the sine wave
sound like a sine wave?

[Don Pearce]

On Tue, 3 May 2005 16:00:45 +0300, "Bob Pit" > wrote:

>> Do you have it set to sine wave?
>Initially I had it set to square. But I get the same strange frequency
>analysis with Sine too.
>
>Bob

How many points are you using in the FFT?

d

Pearce Consulting
http://www.pearce.uk.com

[Bob Pit]

> And you have modulation and everything else set to off? Does the sine wave
> sound like a sine wave?

Everything besides the "flavor characteristic (set to 1)" is set to 0. I do
not know if it sounds like a sine. But it does look like a sine wave when I
magnify it in CoolEdit.

Bob



"Ricky Hunt" > wrote in message
news:lGKde.44174$r53.41573@attbi_s21...
>
> "Bob Pit" > wrote in message
> news:1115125086.451992@athnrd02...
>>> Do you have it set to sine wave?
>> Initially I had it set to square. But I get the same strange frequency
>> analysis with Sine too.
>>
>
> And you have modulation and everything else set to off? Does the sine wave
> sound like a sine wave?
>

[Bob Pit]

>How many points are you using in the FFT?

I left FFT at 128.

Hm, Now that I set it to 16384, I think I understand what is happening.

I get a sharp peak at about 440 Hz (This is the frequency I wanted to
generate). But I still get frequencies from 270Hz up to 613 Hz with volumes
above -83 db. Is this normal?

Bob




----- Original Message -----
From: "Don Pearce" >
Newsgroups: rec.audio.misc,rec.audio.pro
Sent: Tuesday, May 03, 2005 4:10 PM
Subject: Re: frequency analysis in CoolEdit Pro


>
> On Tue, 3 May 2005 16:00:45 +0300, "Bob Pit" > wrote:
>
>>> Do you have it set to sine wave?
>>Initially I had it set to square. But I get the same strange frequency
>>analysis with Sine too.
>>
>>Bob
>
> How many points are you using in the FFT?
>
> d
>
> Pearce Consulting
> http://www.pearce.uk.com

[Richard Crowley]

"Bob Pit" wrote ...
> In CoolEdit pro I go to menu Generate->Tones and I insert (what I
> think it is) a very clear single frequency. I experimented with 30
> Hz, 100 Hz and 320 Hz. But when I go to menu Analyze->[Show Frequency
> Analysis], in all cases it shows me frequencies of 344,5 Hz - 689 Hz -
> 1033 Hz - 1378 Hz...... (they are all multiples of 344,5 Hz). Only
> the db readings differ.

Increase the FFT size to get better resolution. I got the same results
as you when I left the FFT size at the default 2048 samples. Increasing
to 65536 yielded something much more as you would expect.

[Ricky Hunt]

"Bob Pit" > wrote in message
news:1115126410.81214@athnrd02...
> >How many points are you using in the FFT?
>
> I left FFT at 128.
>
> Hm, Now that I set it to 16384, I think I understand what is happening.
>
> I get a sharp peak at about 440 Hz (This is the frequency I wanted to
> generate). But I still get frequencies from 270Hz up to 613 Hz with
> volumes above -83 db. Is this normal?

That could be it. I have mine set at FFT 8192/Blackmann-Harris and range/ref
to 72/-35 and it looks right. If I move it to your settings it get the side
bands much prominently.

[Don Pearce]

On Tue, 3 May 2005 16:22:55 +0300, "Bob Pit" > wrote:

>>How many points are you using in the FFT?
>
>I left FFT at 128.
>
>Hm, Now that I set it to 16384, I think I understand what is happening.
>
>I get a sharp peak at about 440 Hz (This is the frequency I wanted to
>generate). But I still get frequencies from 270Hz up to 613 Hz with volumes
>above -83 db. Is this normal?
>
>Bob

Quite normal, and they are artifacts of the FFT - they aren't actually
there. Set to 65536, and choose a Hanning window for best accuracy. It
will still only be approximate, though; the frequency bins are of
finite width.

d

Pearce Consulting
http://www.pearce.uk.com

[Bob Pit]

> Quite normal, and they are artifacts of the FFT - they aren't actually
> there.

Can I ask something else? What if I really wanted to have a range of
frequencies. Like a mixture of frequencies spanning from 310 to 330 Hz.
Exactly how would I play with the settings ?

Thanks.
Bob




"Don Pearce" > wrote in message
...
>
> On Tue, 3 May 2005 16:22:55 +0300, "Bob Pit" > wrote:
>
>>>How many points are you using in the FFT?
>>
>>I left FFT at 128.
>>
>>Hm, Now that I set it to 16384, I think I understand what is happening.
>>
>>I get a sharp peak at about 440 Hz (This is the frequency I wanted to
>>generate). But I still get frequencies from 270Hz up to 613 Hz with
>>volumes
>>above -83 db. Is this normal?
>>
>>Bob
>
> Quite normal, and they are artifacts of the FFT - they aren't actually
> there. Set to 65536, and choose a Hanning window for best accuracy. It
> will still only be approximate, though; the frequency bins are of
> finite width.
>
> d
>
> Pearce Consulting
> http://www.pearce.uk.com

[Scott Dorsey]

In article <1115131920.427993@athnrd02>, Bob Pit > wrote:
>> Quite normal, and they are artifacts of the FFT - they aren't actually
>> there.
>
>Can I ask something else? What if I really wanted to have a range of
>frequencies. Like a mixture of frequencies spanning from 310 to 330 Hz.
>Exactly how would I play with the settings ?

Easiest thing is a warble tone... one sine wave frequency-modulated with
another. Very handy for room testing.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Don Pearce]

On Tue, 3 May 2005 17:54:47 +0300, "Bob Pit" > wrote:

>> Quite normal, and they are artifacts of the FFT - they aren't actually
>> there.
>
>Can I ask something else? What if I really wanted to have a range of
>frequencies. Like a mixture of frequencies spanning from 310 to 330 Hz.
>Exactly how would I play with the settings ?
>
>Thanks.
>Bob

If it is just a few, chose the tones option in the generate menu, and
set the first one to the lowest. You can now put non-integer
multipliers in the other tone bars, and set levels as you need them.
For 310 and 330, you would put 310 in as the base frequency, and 1.065
as the multiplier in the next bar.

Otherwise, you may have to generate them separately and mix/paste
them.

d

Pearce Consulting
http://www.pearce.uk.com

[Bob Pit]

What I meant was something different.

I want to have frequencies from 310 to 330. ie 310, 311, 312, 313, 314,
315, 316, 317, 318 ... 329, 330. Either all at the same time, or one by
one have them appear in succession whithin a second.

Also, how can I zoom in the frequency analysis window? I want to focus in a
small range of frequencies (310-330) and the window spans from 0-20000 Hz.

Thanks
Bob



"Don Pearce" > wrote in message
...
>
> On Tue, 3 May 2005 17:54:47 +0300, "Bob Pit" > wrote:
>
>>> Quite normal, and they are artifacts of the FFT - they aren't actually
>>> there.
>>
>>Can I ask something else? What if I really wanted to have a range of
>>frequencies. Like a mixture of frequencies spanning from 310 to 330 Hz.
>>Exactly how would I play with the settings ?
>>
>>Thanks.
>>Bob
>
> If it is just a few, chose the tones option in the generate menu, and
> set the first one to the lowest. You can now put non-integer
> multipliers in the other tone bars, and set levels as you need them.
> For 310 and 330, you would put 310 in as the base frequency, and 1.065
> as the multiplier in the next bar.
>
> Otherwise, you may have to generate them separately and mix/paste
> them.
>
> d
>
> Pearce Consulting
> http://www.pearce.uk.com

[Don Pearce]

On Tue, 3 May 2005 18:59:46 +0300, "Bob Pit" > wrote:

>What I meant was something different.
>
>I want to have frequencies from 310 to 330. ie 310, 311, 312, 313, 314,
>315, 316, 317, 318 ... 329, 330. Either all at the same time, or one by
>one have them appear in succession whithin a second.
>
>Also, how can I zoom in the frequency analysis window? I want to focus in a
>small range of frequencies (310-330) and the window spans from 0-20000 Hz.
>
>Thanks
>Bob

Ah - right.

For the first you need a different piece of software. Something like
Matlab would do that.

For the second - no, the frequency analysis tool won't zoom that way.
Nor would there be a great deal of point if it did. There is still
only a finite number of frequency points to be displayed. If you
really needed it, though, Matlab would also do that.

It is a mathematical tool, though, not an audio one.

d

Pearce Consulting
http://www.pearce.uk.com

[Arny Krueger]

Bob Pit wrote:
> What I meant was something different.
>
> I want to have frequencies from 310 to 330. ie 310, 311,
312, 313,
> 314, 315, 316, 317, 318 ... 329, 330. Either all at the
same time,
> or one by one have them appear in succession whithin a
second.
>
> Also, how can I zoom in the frequency analysis window? I
want to
> focus in a small range of frequencies (310-330) and the
window spans
> from 0-20000 Hz.

One approach is to generate tones at each frequency in a
separate file, and then use edit, mix paste, overlap to add
them together.

In fact you can generate five tones at a time from the
generate tones window. You just make the base frequency 1
Hz, and use appropriate multipliers for each subtone.

[Bob Pit]

Thank you for the tip.

I thought I could do what I wanted with the Modulation feature ([Modulate
by] and [Modulate Frequency]). So this feature will generate only 2
frequencies?

Bob


"Arny Krueger" > wrote in message
...
>
> Bob Pit wrote:
>> What I meant was something different.
>>
>> I want to have frequencies from 310 to 330. ie 310, 311,
> 312, 313,
>> 314, 315, 316, 317, 318 ... 329, 330. Either all at the
> same time,
>> or one by one have them appear in succession whithin a
> second.
>>
>> Also, how can I zoom in the frequency analysis window? I
> want to
>> focus in a small range of frequencies (310-330) and the
> window spans
>> from 0-20000 Hz.
>
> One approach is to generate tones at each frequency in a
> separate file, and then use edit, mix paste, overlap to add
> them together.
>
> In fact you can generate five tones at a time from the
> generate tones window. You just make the base frequency 1
> Hz, and use appropriate multipliers for each subtone.
>
>

[Arny Krueger]

Bob Pit wrote:
> Thank you for the tip.
>
> I thought I could do what I wanted with the Modulation
feature
> ([Modulate by] and [Modulate Frequency]). So this feature
will
> generate only 2 frequencies?

The edit mix paste overlap command does point-by-point
addition of the two waves.

The edit mix paste modulate command does point-by-point
multiplication of the two waves.

What you want to do is add simple waves up to form a more
complex wave, right?

[Bob Pit]

> The edit mix paste overlap command does point-by-point
> addition of the two waves.
>
> The edit mix paste modulate command does point-by-point
> multiplication of the two waves.
>
> What you want to do is add simple waves up to form a more
> complex wave, right?

Sorry, you lost me here. I know too little about sound theory to follow
even this simple terminology.

It is OK. I can proceed with what I know for now.

Thanks
Bob


"Arny Krueger" > wrote in message
...
>
> Bob Pit wrote:
>> Thank you for the tip.
>>
>> I thought I could do what I wanted with the Modulation
> feature
>> ([Modulate by] and [Modulate Frequency]). So this feature
> will
>> generate only 2 frequencies?
>
> The edit mix paste overlap command does point-by-point
> addition of the two waves.
>
> The edit mix paste modulate command does point-by-point
> multiplication of the two waves.
>
> What you want to do is add simple waves up to form a more
> complex wave, right?
>
>

[Norbert Hahn]

On Tue, 3 May 2005 18:59:46 +0300, Bob Pit wrote:

>What I meant was something different.
>
>I want to have frequencies from 310 to 330. ie 310, 311, 312, 313, 314,
>315, 316, 317, 318 ... 329, 330. Either all at the same time, or one by
>one have them appear in succession whithin a second.

If you want to have a "bunch of frequencies" at the same time you may
think of generating white noise and use a FFT filter to cut off
unwanted frequencies. If you want to have them in succession you may
use the batch functions of CoolEdit/Audition. However, I've never used
batch functions or macros.
>
>Also, how can I zoom in the frequency analysis window? I want to focus in a
>small range of frequencies (310-330) and the window spans from 0-20000 Hz.

You can do that with Audition (may be CEP as well): Right click on the
frequency axis at the lower end (your window will later begin here)
and drag the mouse while holding the right mouse switch down until the
width of the windows is set.

A single right click on the frequency axis will pop up a window for
zooming out.

Frequency generation of sine wave a correct in CEP/Audition.
Generation of square waves is broken, however. That can easily
be seen by the frequency analysis function;-)

Norbert