Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: Mastermime on June 13, 2012, 12:54:44 PM

Title: Any issues with using two microphones?
Post by: Mastermime on June 13, 2012, 12:54:44 PM
Hello everyone,

I am building a rescue robot and I am wondering if there are any issues when using two microphones instead of one. 

As you can see from the link the transmitter supports the standard RCA connections (one for video, one for left audio, and one for right audio)

http://www.amazon.com/Wolfcom-3000MA-Wireless-Security-Transmitter/dp/B005DUCKUA/ref=pd_sxp_f_pt/186-3436856-2992944 (http://www.amazon.com/Wolfcom-3000MA-Wireless-Security-Transmitter/dp/B005DUCKUA/ref=pd_sxp_f_pt/186-3436856-2992944)

My question is will there be any interfering signals on the receiver end since there will be a different recording from each microphone?

Thanks
Title: Re: Any issues with using two microphones?
Post by: Mastermime on June 20, 2012, 07:33:17 PM
Surely, someone must know..
Title: Re: Any issues with using two microphones?
Post by: Soeren on June 23, 2012, 02:44:01 PM
Hi,

Surely, someone must know..
Yes, but sometimes shit happens (Like ransome-ware attacks :()

No matter how you transfer the signal (copper, radio or whatever), mixing two signals will produce a third.

Assuming just a whistle (a fairly close sine wave) which hit the two michrophones at an angle from their center, the sound waves will hit at different phases and this will produce a third signal. If you draw two sines with their phases eg. 30° apart, it should be clear to you.

Whether it will be an issue in your situation is hard to say, but if you just want to listen to the sound it's probably OK (if not, just settle for a single mike).
Title: Re: Any issues with using two microphones?
Post by: Mastermime on June 24, 2012, 08:42:49 PM
Quote
Yes, but sometimes shit happens (Like ransome-ware attacks )
That was a just a comment to refresh the topic   ;)

Quote
Yes, but sometimes shit happens (Like ransome-ware attacks )

No matter how you transfer the signal (copper, radio or whatever), mixing two signals will produce a third.

Assuming just a whistle (a fairly close sine wave) which hit the two michrophones at an angle from their center, the sound waves will hit at different phases and this will produce a third signal. If you draw two sines with their phases eg. 30° apart, it should be clear to you.

Whether it will be an issue in your situation is hard to say, but if you just want to listen to the sound it's probably OK (if not, just settle for a single mike).
Oh I see.  Once again you save me.   Thank you Soeren