Public Address 'Tannoy' effect

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Public Address 'Tannoy' effect

Permanent link to this post Posted by steve » Mon Apr 17, 2017 12:14 pm

This effect simulates a megaphone or 'Tannoy' system, such as used at outdoor events. Lots of tweakable parameters that should be fairly self-explanatory.
Here's a before and after, using the default settings for the 'after':
tannoy.wav
(237.96 KiB) Downloaded 55 times


The plug-in:
PublicAddress.ny
(1.69 KiB) Downloaded 65 times

Installation instructions: http://wiki.audacityteam.org/wiki/Downl ... ns#install

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Re: Public Address 'Tannoy' effect

Permanent link to this post Posted by kozikowski » Tue Apr 18, 2017 3:41 pm

Feedback? "Everybody knows" PA systems have to feed..eeeEEEEEEEE!

Just like "everybody knows" radar has to go 'round and 'round, etc.

Koz
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Re: Public Address 'Tannoy' effect

Permanent link to this post Posted by steve » Tue Apr 18, 2017 6:26 pm

kozikowski wrote:Feedback? "Everybody knows" PA systems have to feed..eeeEEEEEEEE!

That's a separate effect, but easy to use and requires no additional download.
Instructions:
1) Enable "Software Playthough"
2) Start recording
3) Take off headphone
4) Put headphones over microphone
5) Take headphones off microphone, and stop the recording.

Mix that into the start of the voice recording, then apply the "Public Address" effect.
How did you get on?
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Re: Public Address 'Tannoy' effect

Permanent link to this post Posted by Trebor » Wed Apr 19, 2017 12:31 am

steve wrote: Please post feedback, reviews and bug reports as replies to this topic ...

I'm nitpicking here, but shouldn't each echo should have less high-frequency content than the previous one, e.g. ...


You wouldn't necessarily need to add another slider: the low-pass effect would be proportional to the echo delay time.
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Re: Public Address 'Tannoy' effect

Permanent link to this post Posted by steve » Wed Apr 19, 2017 1:22 am

Trebor wrote:I'm nitpicking here, but shouldn't each echo should have less high-frequency content than the previous one

Yes, to sound more authentic, it should, but have you looked at the code?
It's a pretty simple effect, with the heavy lifting (except for the final "normalize" step) handled efficiently in Nyquist's DSP primitives (written in C). The advantages of this are speed, efficiency, and only a small amount of Nyquist code.

The downside is that there's only a limited amount of customisation of the DSP units available. In particular, it's not possible to insert additional processing within the delay loop. Nevertheless, when the echoes are kept reasonably low compared to the reverb, I think the effect is pretty good for such a simple and convenient effect.

It IS possible to construct feedback delay with a low-pass filter inserted in the delay loop, by writing the loop as a LISP loop, but I was really interested in doing this with the built-in primitives.

As always, thanks for your feedback Trebor (pun half-intended ;-)

Steve
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Re: Public Address 'Tannoy' effect

Permanent link to this post Posted by stujstu » Thu May 11, 2017 11:46 am

I maybe being dim here....but i have downloaded your plug in which is exactly what i need) Enabled it in plug ins and attempted to use it on a track.

However, no matter what settings i choose, it doesn't seem to alter the audio. Other plugins work fine.

Is your plugin dependent on something else that i'm missing?

Any guidance appreciated.

Stu
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Re: Public Address 'Tannoy' effect

Permanent link to this post Posted by steve » Thu May 11, 2017 12:23 pm

stujstu wrote:I maybe being dim here....but i have downloaded your plug in which is exactly what i need) Enabled it in plug ins and attempted to use it on a track.

However, no matter what settings i choose, it doesn't seem to alter the audio. Other plugins work fine.

Is your plugin dependent on something else that i'm missing?

Any guidance appreciated.

Stu

What sort of sound are you trying to use it on?
Which version of Audacity? (Look in "Help > About Audacity")
What sort of speakers / headphones are you listening with?

When you run it, click the "Debug" button instead of the "OK" button. If it shows you an error message, copy and paste the error message into your reply.
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Re: Public Address 'Tannoy' effect

Permanent link to this post Posted by Trebor » Mon Jun 05, 2017 7:22 am

If a short echo length (time) is selected, and reverb is off, the result is like a blues vocal mic ...

Blues-mic settings.png
Blues-mic settings.png (15.89 KiB) Viewed 703 times

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Re: Public Address 'Tannoy' effect

Permanent link to this post Posted by steve » Mon Jun 05, 2017 7:39 am

That's cool Trebor.
The high frequency roll-off is the most obvious effect, but then the short delay adds "something else" which is hard to put your finger on just from listening.
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Re: Public Address 'Tannoy' effect

Permanent link to this post Posted by Trebor » Mon Jun 05, 2017 12:58 pm

steve wrote:... the short delay adds "something else"...

It's effectively a comb filter
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