odigg
500+ Head-Fier
- Joined
- Apr 1, 2008
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I've been thinking about how human hearing works and I've hit one of the "What" moments.
Hopefully somebody can help.
Final questions in brief: How is it we can hear different frequencies simultaneously? How is it a driver can produce sound in such a way that it sounds like we are hearing different frequencies simultaneously?
The above question, just in much more detail:
First, let me describe my understanding of a driver. Perhaps I'm thinking about it incorrectly and this is my problem.
A driver moves air. A driver does this by vibrating. It vibrates faster for higher frequencies and slower for lower frequencies. A driver cannot vibrate in such a way that it produces two frequencies at exactly the same time (eg. 100hz and 10000hz). A driver can only vibrate at one frequency at a time.
So let's say we have a flute (high frequencies) playing with a cello (low frequencies). Each instrument is producing a particular waveform. When you record these instruments playing, the microphone picks up one complex waveform. This complex waveform is a composition of the flute and cello and only has one frequency (the combination of the flute and cell at that moment) at a given moment.
Thus the driver has to only reproduce one frequency at a given moment.
But if this waveform is a combination of two instruments, how can I tell them apart when I hear them? Why do I hear two instruments and not just one instrument that sounds like a combination of a flute and cello? Is it because the waveform/frequencies is changing quickly the brain figures it out? It is like a movie, where the brain sees individual pictures as fluid motion?
Hope all this made sense.
Hopefully somebody can help.
Final questions in brief: How is it we can hear different frequencies simultaneously? How is it a driver can produce sound in such a way that it sounds like we are hearing different frequencies simultaneously?
The above question, just in much more detail:
First, let me describe my understanding of a driver. Perhaps I'm thinking about it incorrectly and this is my problem.
A driver moves air. A driver does this by vibrating. It vibrates faster for higher frequencies and slower for lower frequencies. A driver cannot vibrate in such a way that it produces two frequencies at exactly the same time (eg. 100hz and 10000hz). A driver can only vibrate at one frequency at a time.
So let's say we have a flute (high frequencies) playing with a cello (low frequencies). Each instrument is producing a particular waveform. When you record these instruments playing, the microphone picks up one complex waveform. This complex waveform is a composition of the flute and cello and only has one frequency (the combination of the flute and cell at that moment) at a given moment.
Thus the driver has to only reproduce one frequency at a given moment.
But if this waveform is a combination of two instruments, how can I tell them apart when I hear them? Why do I hear two instruments and not just one instrument that sounds like a combination of a flute and cello? Is it because the waveform/frequencies is changing quickly the brain figures it out? It is like a movie, where the brain sees individual pictures as fluid motion?
Hope all this made sense.