Sound recognition for door opener

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hi all,

i live in building have sliding door opens pulse (key)switch.
because ride bike in , out of building open door electronic bicycle bell.

i wonder if can done arduino.

scenario:
- approach door riding bike
- sound bell , door opens

this bicycle bell sounds like:
https://www.youtube.com/watch?v=lcf6xbklfpi

when sound recognized relay should closed 0.1-0.5 seconds.

which arduino ?
what kind of microphone ?
what kind of relay ?

but of all: how arduino recognize sound ?

i hope give me clues how go this.

quote
how arduino recognize sound ?
you can't. discriminating specific sound background incredibly difficult problem, despite misleading fact our brains, result of billion or years of evolution, easily.

if want learn sound recognition computer , microphone, start google , pc/mac, not arduino.


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