rossmalone@gmail.com

Is there an object which can compare an inputted frequency to a predetermined one, allowing me to build a guitar/bass tuner?

Is there an object which can compare an inputted frequency to a predetermined one, allowing me to build a guitar/bass tuner?
if anyone can help please do :)
thanks
ross


instrument-tuner

There may be an object or 3rd party external, but it's easy to do 

this operation yourself. Simply subtract the second number (the 

input) from the first number (the reference). If the result is 

positive the input is flat, if it is negative the input is sharp. If 

the result is 0 you're right on, of course.

Rather than display the simple frequency difference, convert the 

frequency ratio into cents by plugging it into the formula (see 

below) for converting frequency to cents and display that, which 

might be more helpful. Displaying some sort of visual indicator which 

changes in response to the cents magnitude would also be useful.

1 cent = 1/100 (1%) of an equal-tempered semitone

c = (1200/log2) * logR; where R = frequency ratio in decimal form

On Feb 27, 2008, at 9:26 AM, Ross Malone wrote:

> Is there an object which can compare an inputted frequency to a 

> predetermined one, allowing me to build a guitar/bass tuner?

There may be an object or 3rd party external, but it's easy to do  
this operation yourself. Simply subtract the second number (the  
input) from the first number (the reference). If the result is  
positive the input is flat, if it is negative the input is sharp. If  
the result is 0 you're right on, of course.

Rather than display the simple frequency difference, convert the  
frequency ratio into cents by plugging it into the formula (see  
below) for converting frequency to cents and display that, which  
might be more helpful. Displaying some sort of visual indicator which  
changes in response to the cents magnitude would also be useful.

1 cent = 1/100 (1%) of an equal-tempered semitone
one octave = 1200 cents
c = (1200/log2) * logR; where R = frequency ratio in decimal form

>
> Is there an object which can compare an inputted frequency to a  
> predetermined one, allowing me to build a guitar/bass tuner?
> if anyone can help please do :)
> thanks
> ross

----
Steven M. Miller
Professor, Contemporary Music Program
College of Santa Fe

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that sounds perfect, i have had a fiddle around with max but i can't find a way of converting an audio signal to numbers, i've tried using number~ but i can't get it to show anything useful!

Thanks so much for your help! 
that sounds perfect, i have had a fiddle around with max but i can't find a way of converting an audio signal to numbers, i've tried using number~ but i can't get it to show anything useful!
thanks again
ross


Have a look at [snapshot~] in the MSP reference manual.

On Feb 27, 2008, at 2:10 PM, Ross Malone wrote:

> that sounds perfect, i have had a fiddle around with max but i 

> can't find a way of converting an audio signal to numbers, i've 

> tried using number~ but i can't get it to show anything useful!

>
> Thanks so much for your help!
> that sounds perfect, i have had a fiddle around with max but i  
> can't find a way of converting an audio signal to numbers, i've  
> tried using number~ but i can't get it to show anything useful!
> thanks again
> ross

I forgot to mention - as you probably already know, the straight 

audio signal of your guitar/bass converted into numbers via 

[snapshot~] won't have any relationship to frequency. It'll be a 

readout of the amplitude. To get the frequency of the incoming signal 

you'll need to use a pitch follower of some sort. Have a look at 

[fiddle~] for example - you can find it at .

I forgot to mention - as you probably already know, the straight  
audio signal of your guitar/bass converted into numbers via  
[snapshot~] won't have any relationship to frequency. It'll be a  
readout of the amplitude. To get the frequency of the incoming signal  
you'll need to use a pitch follower of some sort. Have a look at  
[fiddle~] for example - you can find it at .

instrument tuner!?