| Author |
Message |
Bob Pit
Guest
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 Posted:
Fri Mar 11, 2005 5:41 pm Post subject:
90 degree phase offset in CoolEdit |
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Hi
I am not very familiar with CoolEdit and I want to playback my voice (or any
mp3 file) with a 90 degree phase offset between the 2 channels/speakers. It
must be easy but how do you do this?
Thanks
Bob
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Arny Krueger
Guest
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| Posted:
Fri Mar 11, 2005 6:35 pm Post subject:
Re: 90 degree phase offset in CoolEdit |
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"Bob Pit" <bobptz@yahoo.gr> wrote in message
news:1110544844.814317@athnrd02
| Quote: | Hi
I am not very familiar with CoolEdit and I want to playback my voice
(or any mp3 file) with a 90 degree phase offset between the 2
channels/speakers. It must be easy but how do you do this?
|
Effects, Filters, Graphic Phase Shifter |
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Scott Dorsey
Guest
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| Posted:
Fri Mar 11, 2005 7:33 pm Post subject:
Re: 90 degree phase offset in CoolEdit |
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In article <1110544844.814317@athnrd02>, Bob Pit <bobptz@yahoo.gr> wrote:
| Quote: | Hi
I am not very familiar with CoolEdit and I want to playback my voice (or any
mp3 file) with a 90 degree phase offset between the 2 channels/speakers. It
must be easy but how do you do this?
|
It's not easy at all. You basically need an all-pass filter that shifts
90 degrees at all frequencies, which is not a trivial thing and it's not
something any of the audio packages normally have because it's not normally
very useful.
Why do you want to do this?
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis." |
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Bob Pit
Guest
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| Posted:
Sat Mar 12, 2005 1:42 am Post subject:
Re: 90 degree phase offset in CoolEdit |
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| Quote: | Effects, Filters, Graphic Phase Shifter
I did a +90 degree phase shift on the left channel. It seems something like |
what I am looking for, but still far from it.
Bob
"Arny Krueger" <arnyk@hotpop.com> wrote in message
news:TPidnVQi2KutAqzfRVn-2A@comcast.com...
| Quote: |
"Bob Pit" <bobptz@yahoo.gr> wrote in message
news:1110544844.814317@athnrd02
Hi
I am not very familiar with CoolEdit and I want to playback my voice
(or any mp3 file) with a 90 degree phase offset between the 2
channels/speakers. It must be easy but how do you do this?
Effects, Filters, Graphic Phase Shifter
|
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| Back to top |
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Bob Pit
Guest
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| Posted:
Sat Mar 12, 2005 1:43 am Post subject:
Re: 90 degree phase offset in CoolEdit |
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How about the "Effects, Filters, Graphic Phase Shifter" that Arny suggested?
| Quote: | Why do you want to do this?
The reason I want it is that the effect of a voiced processed like this, is |
very hypnotic. I want to make hypnotic/subliminal mp3 files for myself.
Bob
"Scott Dorsey" <kludge@panix.com> wrote in message
news:d0sa7t$gfk$1@panix2.panix.com...
| Quote: |
In article <1110544844.814317@athnrd02>, Bob Pit <bobptz@yahoo.gr> wrote:
Hi
I am not very familiar with CoolEdit and I want to playback my voice (or
any
mp3 file) with a 90 degree phase offset between the 2 channels/speakers.
It
must be easy but how do you do this?
It's not easy at all. You basically need an all-pass filter that shifts
90 degrees at all frequencies, which is not a trivial thing and it's not
something any of the audio packages normally have because it's not
normally
very useful.
Why do you want to do this?
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis." |
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| Back to top |
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play on
Guest
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| Posted:
Sat Mar 12, 2005 1:59 am Post subject:
Re: 90 degree phase offset in CoolEdit |
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Voxengo makes a phase shift plugin.
Al
On Fri, 11 Mar 2005 22:42:10 +0200, "Bob Pit" <bobptz@yahoo.gr> wrote:
| Quote: | Effects, Filters, Graphic Phase Shifter
I did a +90 degree phase shift on the left channel. It seems something like
what I am looking for, but still far from it.
Bob
"Arny Krueger" <arnyk@hotpop.com> wrote in message
news:TPidnVQi2KutAqzfRVn-2A@comcast.com...
"Bob Pit" <bobptz@yahoo.gr> wrote in message
news:1110544844.814317@athnrd02
Hi
I am not very familiar with CoolEdit and I want to playback my voice
(or any mp3 file) with a 90 degree phase offset between the 2
channels/speakers. It must be easy but how do you do this?
Effects, Filters, Graphic Phase Shifter
|
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| Back to top |
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Scott Dorsey
Guest
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| Posted:
Sat Mar 12, 2005 2:09 am Post subject:
Re: 90 degree phase offset in CoolEdit |
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In article <1110573659.111832@athnrd02>, Bob Pit <bobptz@yahoo.gr> wrote:
| Quote: | Effects, Filters, Graphic Phase Shifter
I did a +90 degree phase shift on the left channel. It seems something like
what I am looking for, but still far from it.
|
What are you looking for?
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis." |
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Bob Pit
Guest
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| Posted:
Sat Mar 12, 2005 2:26 am Post subject:
Re: 90 degree phase offset in CoolEdit |
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| Quote: | What are you looking for?
As I said, I want to make hypnotic/subliminal mp3 files for myself. The |
only specs I have is "90 degree phase offset". I cannot describe it in
other specific ways. I can send you a very small segment of a professional
created mp3 file that use this technique if you want. If you are
experienced, then you will know how they did it.
Bob |
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Dimitrios Tzortzakakis
Guest
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| Posted:
Sat Mar 12, 2005 2:34 am Post subject:
Re: 90 degree phase offset in CoolEdit |
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In theory, a phase shift of 90 degrees is done by a capacitor.To calculate
the capacitance, for the desired frequency (20 Hz-20 kHz) you have to use
the following formula:Xc= 1/(omega*c)where omega=2*pi*f, f=frequency in
Hz.To give you an idea, for fm and tv frequency (VHF and UHF) we use 1nF and
for AM 100 nF capacitors.So, for audio frequencies, you need a 10
micro-farad capacitor (100 times that of the AM).
Tzortzakakis Dimitriïs
major in electrical engineering, freelance electrician
FH von Iraklion-Kreta, freiberuflicher Elektriker
dimtzort AT otenet DOT gr
Ï "Bob Pit" <bobptz@yahoo.gr> Ýãñáøå óôï ìÞíõìá
news:1110544844.814317@athnrd02...
| Quote: | Hi
I am not very familiar with CoolEdit and I want to playback my voice (or
any
mp3 file) with a 90 degree phase offset between the 2 channels/speakers.
It
must be easy but how do you do this?
Thanks
Bob
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| Back to top |
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Scott Dorsey
Guest
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| Posted:
Sat Mar 12, 2005 2:42 am Post subject:
Re: 90 degree phase offset in CoolEdit |
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In article <1110576331.158713@athnrd02>, Bob Pit <bobptz@yahoo.gr> wrote:
| Quote: | What are you looking for?
As I said, I want to make hypnotic/subliminal mp3 files for myself. The
only specs I have is "90 degree phase offset". I cannot describe it in
other specific ways. I can send you a very small segment of a professional
created mp3 file that use this technique if you want. If you are
experienced, then you will know how they did it.
|
No, a 90-degree phase shift is really not very audible at all. Again, it's
an all-pass thing.
Are you thinking about some kind of comb filtering, and not really phase
shift at all?
Since MP3s don't exactly preserve phase very well anyway, any of this stuff
is going to be mostly lost in MP3 encoding in any event.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis." |
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Bob Pit
Guest
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| Posted:
Sat Mar 12, 2005 3:24 am Post subject:
Re: 90 degree phase offset in CoolEdit |
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| Quote: | No, a 90-degree phase shift is really not very audible at all. Again,
it's
an all-pass thing.
Are you thinking about some kind of comb filtering, and not really phase
shift at all?
|
I wish I knew what these mean. If I knew all these, probably I would not
ask for help in this forum.
Bob |
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Dave Kowalski
Guest
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| Posted:
Sat Mar 12, 2005 4:17 am Post subject:
Re: 90 degree phase offset in CoolEdit-sample, please |
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Can you post a link to what you're talking about? It would be easier to
offer help.
Thanks
"Dimitrios Tzortzakakis" <use@address.below> wrote in message
news:d0t33a$jv8$1@usenet.otenet.gr...
| Quote: | In theory, a phase shift of 90 degrees is done by a capacitor.To calculate
the capacitance, for the desired frequency (20 Hz-20 kHz) you have to use
the following formula:Xc= 1/(omega*c)where omega=2*pi*f, f=frequency in
Hz.To give you an idea, for fm and tv frequency (VHF and UHF) we use 1nF
and
for AM 100 nF capacitors.So, for audio frequencies, you need a 10
micro-farad capacitor (100 times that of the AM).
Tzortzakakis Dimitriïs
major in electrical engineering, freelance electrician
FH von Iraklion-Kreta, freiberuflicher Elektriker
dimtzort AT otenet DOT gr
Ï "Bob Pit" <bobptz@yahoo.gr> Ýãñáøå óôï ìÞíõìá
news:1110544844.814317@athnrd02...
Hi
I am not very familiar with CoolEdit and I want to playback my voice (or
any
mp3 file) with a 90 degree phase offset between the 2 channels/speakers.
It
must be easy but how do you do this?
Thanks
Bob
|
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| Back to top |
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Richard Crowley
Guest
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| Posted:
Sat Mar 12, 2005 6:13 am Post subject:
Re: 90 degree phase offset in CoolEdit |
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"Bob Pit" wrote ...
| Quote: | I am not very familiar with CoolEdit and I want to playback my voice
(or any mp3 file) with a 90 degree phase offset between the 2
channels/speakers. It must be easy but how do you do this?
|
90 degrees of phase shift depends on what frequency you are talking
about, doesn't it? It is 1000x longer for 20Hz than it is for 20KHz |
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Phil Allison
Guest
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| Posted:
Sat Mar 12, 2005 6:38 am Post subject:
Re: 90 degree phase offset in CoolEdit |
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"Scott Dorsey"
Bob Pit :
| Quote: |
I am not very familiar with CoolEdit and I want to playback my voice (or
any
mp3 file) with a 90 degree phase offset between the 2 channels/speakers.
It
must be easy but how do you do this?
It's not easy at all. You basically need an all-pass filter that shifts
90 degrees at all frequencies, which is not a trivial thing and it's not
something any of the audio packages normally have because it's not
normally
very useful.
|
** Here is how you do it:
http://home.att.net/~wa1sov/technical/allpass/allpass.html
Enjoy.........
| Quote: | Why do you want to do this?
|
** He is loopy.
............. Phil |
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Mike Rivers
Guest
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| Posted:
Sat Mar 12, 2005 6:41 am Post subject:
Re: 90 degree phase offset in CoolEdit |
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In article <1110579825.435618@athnrd02> bobptz@yahoo.gr writes:
| Quote: | I wish I knew what these mean. If I knew all these, probably I would not
ask for help in this forum.
|
I think you should ask whoever produced the files you're trying to
emulate. A 90 degree phase shift to one channel doesn't make any
sense. But maybe it's not supposed to.
If you'd like to experiment with hardware, the Little Labs IBP is a
box that has an adjustable phase shift. It's most often used to line
up a guitar direct signal with a microphone on an amplifier. It might
be educational to try it if you can find one to borrow.
--
I'm really Mike Rivers (mrivers@d-and-d.com)
However, until the spam goes away or Hell freezes over,
lots of IP addresses are blocked from this system. If
you e-mail me and it bounces, use your secret decoder ring
and reach me here: double-m-eleven-double-zero at yahoo |
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