Hello, 

I'm wondering if anyone has experience with this. 

How to make a variable resistor out of a violin bow with a wire inserted amongst the hair, where the resistance changes depending on the position, along the length of the bow, of the point of contact between the string and the bow?

I don't know anything about electronic circuitry so I'm hoping that there is a foolproof manual for making/understanding such a device, or an explanation for a dummy. 

I've found this http://www.speech.kth.se/prod/publications/files/qpsr/1988/1988_29_1_001-030.pdf. I understand the basic principle but not the detail. 

Many Thanks

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

Hello Peiman,

It seems the pdf you included describes how to do this.

They use a wheatstone bridge (that measures tiny resistor difference accurately).

'All' you have to do is build this circuit,feed the output to an Arduino and from there to Csound, using OSC or so.

Richard

2013/11/18 peiman khosravi <peimankhosravi@gmail.com>

Hello, 

I'm wondering if anyone has experience with this. 

How to make a variable resistor out of a violin bow with a wire inserted amongst the hair, where the resistance changes depending on the position, along the length of the bow, of the point of contact between the string and the bow?

I don't know anything about electronic circuitry so I'm hoping that there is a foolproof manual for making/understanding such a device, or an explanation for a dummy. 

I've found this http://www.speech.kth.se/prod/publications/files/qpsr/1988/1988_29_1_001-030.pdf. I understand the basic principle but not the detail. 

Many Thanks

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

Thanks Richard,

How the string/bow becomes parts of a wheatstone bridge is what I don't quite understand. This is how I interpret the chart:

I don't quite understand the diagram on page 4. I'm sure it's simple but...

I was hoping to input the signal as line in, rather than OSC, to avoid too much latency. 

Thanks!

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

On 18 November 2013 14:26, Richard van Bemmelen <zappfinger@gmail.com> wrote:

Hello Peiman,

It seems the pdf you included describes how to do this.

They use a wheatstone bridge (that measures tiny resistor difference accurately).

'All' you have to do is build this circuit,feed the output to an Arduino and from there to Csound, using OSC or so.

Richard

2013/11/18 peiman khosravi <peimankhosravi@gmail.com>

Hello, 

I'm wondering if anyone has experience with this. 

How to make a variable resistor out of a violin bow with a wire inserted amongst the hair, where the resistance changes depending on the position, along the length of the bow, of the point of contact between the string and the bow?

I don't know anything about electronic circuitry so I'm hoping that there is a foolproof manual for making/understanding such a device, or an explanation for a dummy. 

I've found this http://www.speech.kth.se/prod/publications/files/qpsr/1988/1988_29_1_001-030.pdf. I understand the basic principle but not the detail. 

Many Thanks

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

Hello Peiman,

Ok, I will have a closer look tonight and let you know.

Richard

2013/11/18 peiman khosravi <peimankhosravi@gmail.com>

Thanks Richard,

How the string/bow becomes parts of a wheatstone bridge is what I don't quite understand. This is how I interpret the chart:

I don't quite understand the diagram on page 4. I'm sure it's simple but...

I was hoping to input the signal as line in, rather than OSC, to avoid too much latency. 

Thanks!

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

On 18 November 2013 14:26, Richard van Bemmelen <zappfinger@gmail.com> wrote:

Hello Peiman,

It seems the pdf you included describes how to do this.

They use a wheatstone bridge (that measures tiny resistor difference accurately).

'All' you have to do is build this circuit,feed the output to an Arduino and from there to Csound, using OSC or so.

Richard

2013/11/18 peiman khosravi <peimankhosravi@gmail.com>

Hello, 

I'm wondering if anyone has experience with this. 

How to make a variable resistor out of a violin bow with a wire inserted amongst the hair, where the resistance changes depending on the position, along the length of the bow, of the point of contact between the string and the bow?

I don't know anything about electronic circuitry so I'm hoping that there is a foolproof manual for making/understanding such a device, or an explanation for a dummy. 

I've found this http://www.speech.kth.se/prod/publications/files/qpsr/1988/1988_29_1_001-030.pdf. I understand the basic principle but not the detail. 

Many Thanks

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

Sorry, I totally forgot to write my interpretation of the chart! But the truth is, I can't figure it out! 

Thanks very much. 

P

www.peimankhosravi.co.uk || RSS Feed || Concert News

On 18 November 2013 14:58, Richard van Bemmelen <zappfinger@gmail.com> wrote:

Hello Peiman,

Ok, I will have a closer look tonight and let you know.

Richard

2013/11/18 peiman khosravi <peimankhosravi@gmail.com>

Thanks Richard,

How the string/bow becomes parts of a wheatstone bridge is what I don't quite understand. This is how I interpret the chart:

I don't quite understand the diagram on page 4. I'm sure it's simple but...

I was hoping to input the signal as line in, rather than OSC, to avoid too much latency. 

Thanks!

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

On 18 November 2013 14:26, Richard van Bemmelen <zappfinger@gmail.com> wrote:

Hello Peiman,

It seems the pdf you included describes how to do this.

They use a wheatstone bridge (that measures tiny resistor difference accurately).

'All' you have to do is build this circuit,feed the output to an Arduino and from there to Csound, using OSC or so.

Richard

2013/11/18 peiman khosravi <peimankhosravi@gmail.com>

Hello, 

I'm wondering if anyone has experience with this. 

How to make a variable resistor out of a violin bow with a wire inserted amongst the hair, where the resistance changes depending on the position, along the length of the bow, of the point of contact between the string and the bow?

I don't know anything about electronic circuitry so I'm hoping that there is a foolproof manual for making/understanding such a device, or an explanation for a dummy. 

I've found this http://www.speech.kth.se/prod/publications/files/qpsr/1988/1988_29_1_001-030.pdf. I understand the basic principle but not the detail. 

Many Thanks

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

Thanks Richard,

How the string/bow becomes parts of a wheatstone bridge is what I don't quite understand. This is how I interpret the chart:

I don't quite understand the diagram on page 4. I'm sure it's simple but...

I was hoping to input the signal as line in, rather than OSC, to avoid too much latency. 

Thanks!

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

On 18 November 2013 14:26, Richard van Bemmelen <zappfinger@gmail.com> wrote:

Hello Peiman,

It seems the pdf you included describes how to do this.

They use a wheatstone bridge (that measures tiny resistor difference accurately).

'All' you have to do is build this circuit,feed the output to an Arduino and from there to Csound, using OSC or so.

Richard

2013/11/18 peiman khosravi <peimankhosravi@gmail.com>

Hello, 

I'm wondering if anyone has experience with this. 

How to make a variable resistor out of a violin bow with a wire inserted amongst the hair, where the resistance changes depending on the position, along the length of the bow, of the point of contact between the string and the bow?

I don't know anything about electronic circuitry so I'm hoping that there is a foolproof manual for making/understanding such a device, or an explanation for a dummy. 

I've found this http://www.speech.kth.se/prod/publications/files/qpsr/1988/1988_29_1_001-030.pdf. I understand the basic principle but not the detail. 

Many Thanks

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

Peiman,

What signal are you interested in: the bow-bridge distance, the bow position or both?

What do you want to do with the signals?

If only the distance, you could leave out nearly the left part of the diagram:

the LP filter and the 2 resistors connected to it...

Also, the resistors in the string bridge should be nearly the same resistance as the string, so 1..3 Ohms, which is quite low. Since this has to be fed with a 10 kHz signal (it does not say what voltage) make sure to put a resistor in the outlet circuit of whatever oscillator you are using, otherwise the current could become too high.

Richard  

2013/11/18 peiman khosravi <peimankhosravi@gmail.com>

Thanks Richard,

How the string/bow becomes parts of a wheatstone bridge is what I don't quite understand. This is how I interpret the chart:

I don't quite understand the diagram on page 4. I'm sure it's simple but...

I was hoping to input the signal as line in, rather than OSC, to avoid too much latency. 

Thanks!

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

On 18 November 2013 14:26, Richard van Bemmelen <zappfinger@gmail.com> wrote:

Hello Peiman,

It seems the pdf you included describes how to do this.

They use a wheatstone bridge (that measures tiny resistor difference accurately).

'All' you have to do is build this circuit,feed the output to an Arduino and from there to Csound, using OSC or so.

Richard

2013/11/18 peiman khosravi <peimankhosravi@gmail.com>

Hello, 

I'm wondering if anyone has experience with this. 

How to make a variable resistor out of a violin bow with a wire inserted amongst the hair, where the resistance changes depending on the position, along the length of the bow, of the point of contact between the string and the bow?

I don't know anything about electronic circuitry so I'm hoping that there is a foolproof manual for making/understanding such a device, or an explanation for a dummy. 

I've found this http://www.speech.kth.se/prod/publications/files/qpsr/1988/1988_29_1_001-030.pdf. I understand the basic principle but not the detail. 

Many Thanks

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

Hi Richard, 

Thanks for this. So I'm only interested in the bow position. No need for the distance. I don't need to worry about the LP filter as I can do that in the digital domain. 

Thanks

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

On 18 November 2013 22:12, Richard van Bemmelen <zappfinger@gmail.com> wrote:

Peiman,

What signal are you interested in: the bow-bridge distance, the bow position or both?

What do you want to do with the signals?

If only the distance, you could leave out nearly the left part of the diagram:

the LP filter and the 2 resistors connected to it...

Also, the resistors in the string bridge should be nearly the same resistance as the string, so 1..3 Ohms, which is quite low. Since this has to be fed with a 10 kHz signal (it does not say what voltage) make sure to put a resistor in the outlet circuit of whatever oscillator you are using, otherwise the current could become too high.

Richard  

2013/11/18 peiman khosravi <peimankhosravi@gmail.com>

Thanks Richard,

How the string/bow becomes parts of a wheatstone bridge is what I don't quite understand. This is how I interpret the chart:

I don't quite understand the diagram on page 4. I'm sure it's simple but...

I was hoping to input the signal as line in, rather than OSC, to avoid too much latency. 

Thanks!

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

On 18 November 2013 14:26, Richard van Bemmelen <zappfinger@gmail.com> wrote:

Hello Peiman,

It seems the pdf you included describes how to do this.

They use a wheatstone bridge (that measures tiny resistor difference accurately).

'All' you have to do is build this circuit,feed the output to an Arduino and from there to Csound, using OSC or so.

Richard

2013/11/18 peiman khosravi <peimankhosravi@gmail.com>

Hello, 

I'm wondering if anyone has experience with this. 

How to make a variable resistor out of a violin bow with a wire inserted amongst the hair, where the resistance changes depending on the position, along the length of the bow, of the point of contact between the string and the bow?

I don't know anything about electronic circuitry so I'm hoping that there is a foolproof manual for making/understanding such a device, or an explanation for a dummy. 

I've found this http://www.speech.kth.se/prod/publications/files/qpsr/1988/1988_29_1_001-030.pdf. I understand the basic principle but not the detail. 

Many Thanks

Peiman

www.peimankhosravi.co.uk || RSS Feed || Concert News

... and perhaps record the violin signal to a table and use that as
source for a second partikkel instance, ... using the bow to control
"grain delay time" (samplepos), ... ?

2013/11/19 peiman khosravi <peimankhosravi@gmail.com>:

> I'm thinking of using the signal as a playhead to read through a sound file
> with partikkel. How cool would that be! Then maybe cross-synthesise the
> sound with the direct violin signal, and modulate the output with the RMS of
> the signal from my Xth sense controller.
>
>
>
>
> www.peimankhosravi.co.uk || RSS Feed || Concert News
>
>
> On 18 November 2013 23:14, peiman khosravi <peimankhosravi@gmail.com> wrote:
>>
>> Hi Richard,
>>
>> Thanks for this. So I'm only interested in the bow position. No need for
>> the distance. I don't need to worry about the LP filter as I can do that in
>> the digital domain.
>>
>> Thanks
>> Peiman
>>
>>
>>
>>
>> www.peimankhosravi.co.uk || RSS Feed || Concert News
>>
>>
>> On 18 November 2013 22:12, Richard van Bemmelen <zappfinger@gmail.com>
>> wrote:
>>>
>>> Peiman,
>>>
>>> What signal are you interested in: the bow-bridge distance, the bow
>>> position or both?
>>> What do you want to do with the signals?
>>> If only the distance, you could leave out nearly the left part of the
>>> diagram:
>>> the LP filter and the 2 resistors connected to it...
>>> Also, the resistors in the string bridge should be nearly the same
>>> resistance as the string, so 1..3 Ohms, which is quite low. Since this has
>>> to be fed with a 10 kHz signal (it does not say what voltage) make sure to
>>> put a resistor in the outlet circuit of whatever oscillator you are using,
>>> otherwise the current could become too high.
>>>
>>> Richard
>>>
>>>
>>> 2013/11/18 peiman khosravi <peimankhosravi@gmail.com>
>>>>
>>>> Thanks Richard,
>>>>
>>>> How the string/bow becomes parts of a wheatstone bridge is what I don't
>>>> quite understand. This is how I interpret the chart:
>>>>
>>>> I don't quite understand the diagram on page 4. I'm sure it's simple
>>>> but...
>>>>
>>>> I was hoping to input the signal as line in, rather than OSC, to avoid
>>>> too much latency.
>>>>
>>>> Thanks!
>>>> Peiman
>>>>
>>>>
>>>>
>>>>
>>>> www.peimankhosravi.co.uk || RSS Feed || Concert News
>>>>
>>>>
>>>> On 18 November 2013 14:26, Richard van Bemmelen <zappfinger@gmail.com>
>>>> wrote:
>>>>>
>>>>> Hello Peiman,
>>>>>
>>>>> It seems the pdf you included describes how to do this.
>>>>> They use a wheatstone bridge (that measures tiny resistor difference
>>>>> accurately).
>>>>> 'All' you have to do is build this circuit,feed the output to an
>>>>> Arduino and from there to Csound, using OSC or so.
>>>>>
>>>>> Richard
>>>>>
>>>>>
>>>>> 2013/11/18 peiman khosravi <peimankhosravi@gmail.com>
>>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> I'm wondering if anyone has experience with this.
>>>>>>
>>>>>> How to make a variable resistor out of a violin bow with a wire
>>>>>> inserted amongst the hair, where the resistance changes depending on the
>>>>>> position, along the length of the bow, of the point of contact between the
>>>>>> string and the bow?
>>>>>>
>>>>>> I don't know anything about electronic circuitry so I'm hoping that
>>>>>> there is a foolproof manual for making/understanding such a device, or an
>>>>>> explanation for a dummy.
>>>>>>
>>>>>> I've found this
>>>>>> http://www.speech.kth.se/prod/publications/files/qpsr/1988/1988_29_1_001-030.pdf.
>>>>>> I understand the basic principle but not the detail.
>>>>>>
>>>>>> Many Thanks
>>>>>> Peiman
>>>>>>
>>>>>>
>>>>>>
>>>>>> www.peimankhosravi.co.uk || RSS Feed || Concert News
>>>>>
>>>>>
>>>>
>>>
>>
>

--

Oeyvind Brandtsegg
Professor of Music Technology
NTNU
7491 Trondheim
Norway
Cell: +47 92 203 205

http://flyndresang.no/
http://www.partikkelaudio.com/
http://soundcloud.com/brandtsegg
http://soundcloud.com/t-emp

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