I2S Audio Input on the Pi

Forums:

The Pi has an I2S bus that is commonly used for audio input on cell pones.

Adrian is considering using this microphone:

Knowles I2Smicrophone datasheet http://www.mouser.com/ds/2/218/-746171.pdf
Cost is $3-$4 singles

See https://jp.raspberrypi.org/forums/viewtopic.php?f=44&t=91237&p=810720