If I were to play a recording of an acoustic instrument into a microphone, would that change the freq?
December 25th, 2009This is for a science experiment.
So for example I record a guitar playing A at 440 Hz at home
and play that back from a speaker into another microphone hooked up to the computer,
how would the frequency differ from if I were to record directly into the microphone?
does it depend on the speaker/microphone? Is there a general rule of increased/decreased frequency?
Thanks for your help and 10 pts to the most helpful answer.
What YahooUser said.
Remember, the purpose of recording equipment usually is to faithfully reproduce sounds. If you record the guitar, and play it back, it would ideally sound just like the guitar. If you record the recording and play that back, it would ideally sound just like the first recording… just like the guitar.
YahooUser talked about distortion, but there’s something much more significant that will happen if you copy a recording by playing it back through a speaker, and re-recording with another mic in a room. The mic won’t just hear sounds that come directly from the speaker, it will also hear sounds that reflect off the walls and the ceiling and the floor. Every room has its own “ambiance,” and that will be added to your second generation recording. If you repeat the process several times, your nth generation recording will start to sound like the guitar was played in a giant echo chamber.
Also, every speaker and every microphone has a unique “frequency response”, which is to say, it emphasizes certain frequencies and deemphasizes others. Unless your speakers and mic have four-figure price tags, the emphasis/deemphasis can be quite significant. You talked about playing an “A 440″ on your guitar. But from a signal analysis point of view, even a single guitar note is actually the sum of sine waves of many different frequencies. When you record that through a mic, and play it through a speaker, even if there’s no harmonic distortion, it’s still the case that some of those frequencies will be boosted, and others will be cut, resulting in a sound that can have a noticeably different “quality” or “timbre” from the original.
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