mthhurley
BoM December 2011
Very interesting information here about which speakers/microphones are used for certain types of calls. News to me!
Clip:
....The iPhone has two microphones and two speakers, one of each on the bottom and another pair on the top. The microphone on the bottom is the grille to the left of the dock connector port as you look at the front of the iPhone the grille to the right of the port is a speaker. This makes it easy to speak into the bottom microphone during a call. When you hold the iPhone up to your ear, youre listening through the other speaker, near the top of the front face of the iPhone; if, at the same time, you rotate the iPhone up at an angle so that the bottom left corner of the iPhone is near your mouth, your voice naturally goes into the bottom microphone. The same is true when youre recording a voice memo, or talking to Siri.
The microphone on the top is a tiny hole next to the headphone port. When you hold the iPhone up to your ear and speak into the bottom microphone during a phone call, the top microphone is used to perform some noise cancellation trickery. Since the top microphone is much further from your mouth than the bottom microphone, the device can assume that what its hearing through the top microphone is mostly background noise and that what its hearing through the bottom microphone is mostly your voice, and it can invert the noise input and mix that with the voice input to reduce the noise component and make your voice clearer.
And now for the surprise. When you take the iPhone away from your face during a call and put it into speakerphone mode (tap the Speaker button), the top microphone is the one that is now active. Did you know this? I sure didnt.
...
Whole article
http://tidbits.com/article/12878
Clip:
....The iPhone has two microphones and two speakers, one of each on the bottom and another pair on the top. The microphone on the bottom is the grille to the left of the dock connector port as you look at the front of the iPhone the grille to the right of the port is a speaker. This makes it easy to speak into the bottom microphone during a call. When you hold the iPhone up to your ear, youre listening through the other speaker, near the top of the front face of the iPhone; if, at the same time, you rotate the iPhone up at an angle so that the bottom left corner of the iPhone is near your mouth, your voice naturally goes into the bottom microphone. The same is true when youre recording a voice memo, or talking to Siri.
The microphone on the top is a tiny hole next to the headphone port. When you hold the iPhone up to your ear and speak into the bottom microphone during a phone call, the top microphone is used to perform some noise cancellation trickery. Since the top microphone is much further from your mouth than the bottom microphone, the device can assume that what its hearing through the top microphone is mostly background noise and that what its hearing through the bottom microphone is mostly your voice, and it can invert the noise input and mix that with the voice input to reduce the noise component and make your voice clearer.
And now for the surprise. When you take the iPhone away from your face during a call and put it into speakerphone mode (tap the Speaker button), the top microphone is the one that is now active. Did you know this? I sure didnt.
...
Whole article
http://tidbits.com/article/12878
