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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
using a trumpet as an input
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neo644



Joined: Aug 18, 2005
Posts: 43
Location: Argentina

PostPosted: Fri Feb 03, 2006 2:59 pm    Post subject: using a trumpet as an input Reply with quote  Mark this post and the followings unread

hi, i'm looking foward in building the sound lab. i'm a newbie when it comes to synths, though i do know some basics, i have been reading and experimenting with software synths a bit. the thing is, is it possible to use a trumpet as an input fot the sound lab? will it require some type of mod? of course i know i'll need a mic, but can i plug it directly to the sound lab or what?

and also, i think i'll be buying the parts online, any recomendation for a good site?

thanks in advance for any help!
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deknow



Joined: Sep 15, 2004
Posts: 1307
Location: Leominster, MA (USA)
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PostPosted: Fri Feb 03, 2006 3:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

a few things to think about

1. yamaha makes a "silent music" system. there is a trumpet mute with a built in mic. my recolection is that it is a standard electret element, so any electret bais power supply/preamp should do (or you can buy the yamaha box that goes with it). my recolection is that it isn't that expensive for the mute/mic only, and it might be a good place to start (especially if you want to mostly hear the effected sound).

2. the more controlls you have that track the trumpet, the more flexibility you will have. an envelope follower will help (voltage increases as your playing volume increases), as will a trigger of some kind (perhaps part of the envelope follower). a pitch to voltage conversion would also be nice. look at the korg stuff (ms20, x911), as well as bob moogs design for the etherwave (there was at one time a sanctioned board put out by efm of this circut...harry bissel did the layout and might have info)...i can't remember if the soundlab is liniar or exponential.....the korg schematics should cover the liniar, and the moog the expo.

3. you will probably want to add a compressor on the input (you might not, but it will likely help out a lot).

deknow
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neo644



Joined: Aug 18, 2005
Posts: 43
Location: Argentina

PostPosted: Fri Feb 03, 2006 3:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
1. yamaha makes a "silent music" system. there is a trumpet mute with a built in mic. my recolection is that it is a standard electret element, so any electret bais power supply/preamp should do (or you can buy the yamaha box that goes with it). my recolection is that it isn't that expensive for the mute/mic only, and it might be a good place to start (especially if you want to mostly hear the effected sound).


yes, i have heard about this. what do you mean with "electret element" ? this is a good possibility i hadn't thinked about, cause as you said, the mute will really help in actually hearing the syntesized trumpet, so it's a good idea to use this to capture the trumpet's sound.

Quote:
2. the more controlls you have that track the trumpet, the more flexibility you will have. an envelope follower will help (voltage increases as your playing volume increases), as will a trigger of some kind (perhaps part of the envelope follower). a pitch to voltage conversion would also be nice. look at the korg stuff (ms20, x911), as well as bob moogs design for the etherwave (there was at one time a sanctioned board put out by efm of this circut...harry bissel did the layout and might have info)...i can't remember if the soundlab is liniar or exponential.....the korg schematics should cover the liniar, and the moog the expo.


you kinda lost me here. i'm trying to start off REALLY basic, i dont know what an envelope follower is.

Quote:
3. you will probably want to add a compressor on the input (you might not, but it will likely help out a lot).


what does a compressor do?

thanks!
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Blue Hell
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Joined: Apr 03, 2004
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PostPosted: Fri Feb 03, 2006 4:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

To get some ideas about what devices like an envelope follower or a compressor do you could have a look in wikipedea.

For instance for the compressor : http://en.wikipedia.org/wiki/Audio_level_compression

The compresssor makes it easier for the pitch detector to do its work. The pitch detector gives a control signal that represents the note that you play. You could use such a signal to make the synthesizer play the same note as you play, or a note that is related to it.

There is not much about envelope followers on wikipedia, but it will give you an idea : http://en.wikipedia.org/wiki/Envelope_follower

An envelope follower would give you a control signal that reperesents how loud you play, you could use such a signal to modify the sound of the synthesizer - for instance it could alter the settings of a filter.

BTW all kinds of languages are available on wkipedia, although not all subjects are the same in all languages; if present at all. Try http://www.wikipedia.org , the main entrance, for this.

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