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???
09/28/06 13:58
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 		 #125287 - Are they unwanted?
Responding to: ???'s previous message
Richard said:
I suppose twin-T or similar filtering will be useful to remove all the unwanted harmonics.

At first, I thought like you, that the harmonics are unwanted and need to be suppressed by suited measures. But is this actually true? The string also produces third and fifth harmonic, so no interference should occur.

The avoid of filters offers an advantage, if the circuit should be hand held, battery powered. A simple transistor stage would be enough then to drive a small loudspeaker. When introducing a low pass filter, on the other hand, some more parts would be needed.

What do you think?

Kai


List of 31 messages in thread
TopicAuthorDate
Auto Violin Tuner            01/01/70 00:00      
   Tuner            01/01/70 00:00      
      You basically need a phase locked loop            01/01/70 00:00      
   use your ears?            01/01/70 00:00      
      you are right            01/01/70 00:00      
         the bane of much learning            01/01/70 00:00      
   suggested improvement            01/01/70 00:00      
      improved inprovement            01/01/70 00:00      
         Corrected            01/01/70 00:00      
   Drop the violin.. and git ya a fiddle!            01/01/70 00:00      
      how did I guess that came from the state where            01/01/70 00:00      
      Musician Joke            01/01/70 00:00      
   This is normally done by the ears            01/01/70 00:00      
      depends on what you really want ...            01/01/70 00:00      
         Now that *is* clever!            01/01/70 00:00      
            That's a good one !!!            01/01/70 00:00      
            somehow, Andy I got a mental picture of            01/01/70 00:00      
               Well, you do have to remove the BS first            01/01/70 00:00      
      440 Hz source            01/01/70 00:00      
         No suited quartz            01/01/70 00:00      
            I'd recommend a frequency synthesizer            01/01/70 00:00      
               Yes, that's standardly used in such an application            01/01/70 00:00      
                  would that be a problem?            01/01/70 00:00      
                     Jitter?            01/01/70 00:00      
                        years ago ...            01/01/70 00:00      
   strobe tuner!            01/01/70 00:00      
      Costly!            01/01/70 00:00      
   How about generating the tones?            01/01/70 00:00      
      you'll want to filter the output            01/01/70 00:00      
         Are they unwanted?            01/01/70 00:00      
            the string does produce harmonics            01/01/70 00:00      

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