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Re: [AVR-Chat] Frequency meter

2007-04-02 by np np

The signal from a guitar is rarely sinusoidal.

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----- Original Message ----
From: "BobGardner@aol.com" <BobGardner@aol.com>
To: AVR-Chat@yahoogroups.com
Sent: Monday, 2 April, 2007 6:59:20 PM
Subject: Re: [AVR-Chat] Frequency meter









  


    
            There is a guitar tuner project at avrfreaks... in general, you apply the signal to be measured to the analog comparator, count clocks between edges using input capture. 

 

-----Original Message-----

From: microbrix@gmail. com

To: AVR-Chat@yahoogroup s.com

Sent: Mon, 2 Apr 2007 1:35 PM

Subject: Re: [AVR-Chat] Frequency meter



On 4/2/07, negink63 <negink63@yahoo. com> wrote:

>

> Hi

> I want to make a tuner an I do not know how I can measure the frequncy

> of an analog signal with AVR. I will be really appriciated If somebody

> could help me.



Tune a Radio, Tune a guitar,  Tuna Piano, Tuna Fish?



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Re: [AVR-Chat] Frequency meter

2007-04-02 by BobGardner@aol.com

So what? he doesnt want to do spectral analysis, he wants the fundamental, which is the time between zero crossings. If you know 'about' the freq to expect, you can amplify and low pass the string to get rid of a lot of the harmonics. I always help the guitar tuner out by turning down the tone control to get rid of the highs so the tuner can find the fundamental easier. Seems to help somewhat.

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-----Original Message-----
From: harrabylad@yahoo.co.uk
To: AVR-Chat@yahoogroups.com
Sent: Mon, 2 Apr 2007 2:09 PM
Subject: Re: [AVR-Chat] Frequency meter


The signal from a guitar is rarely sinusoidal.


----- Original Message ----
From: "BobGardner@aol.com" <BobGardner@aol.com>
To: AVR-Chat@yahoogroups.com
Sent: Monday, 2 April, 2007 6:59:20 PM
Subject: Re: [AVR-Chat] Frequency meter









  


    
            There is a guitar tuner project at avrfreaks... in general, you 
apply the signal to be measured to the analog comparator, count clocks between 
edges using input capture. 

 

-----Original Message-----

From: microbrix@gmail. com

To: AVR-Chat@yahoogroup s.com

Sent: Mon, 2 Apr 2007 1:35 PM

Subject: Re: [AVR-Chat] Frequency meter



On 4/2/07, negink63 <negink63@yahoo. com> wrote:

>

> Hi

> I want to make a tuner an I do not know how I can measure the frequncy

> of an analog signal with AVR. I will be really appriciated If somebody

> could help me.



Tune a Radio, Tune a guitar,  Tuna Piano, Tuna Fish?



[Non-text portions of this message have been removed]



Yahoo! Groups Links



____________ _________ _________ _________ _________ _________ _

AOL now offers free email to everyone.  Find out more about what's free from AOL 
at AOL.com.



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Re: [AVR-Chat] Frequency meter

2007-04-02 by John Samperi

At 04:52 AM 3/04/2007, you wrote:
 >he wants the fundamental,

Would it not be easier to measure the frequency of the
local oscillator and the add the number of the frequency
of the IF stage?
I guess a frequency divider would be necessary unless one
has a 200MHz counter inside the AVR :)


Regards

John Samperi

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