voice controlled lights and blinds

[Franz <fln@xxxxxxxxxxxxx>]

Hi everybody,
I have a question for you experts.
A friend of mine, who is forced on a wheel chair,
asked to me if it was possible to switch on / off
the lights in his house (or open/close the blinds)
by simply using voice commands.
Example: he enters his bedroom and speaks
"BEDROOM" "LIGHTS" "ON" or
"BEDROOM" "BLINDS" "CLOSE"
Can this be done?
Is there anything existent on the market? Or at least
could you please suggest me some resources and devices
to "put together" in order to build something like that?
My friend reminds me that something similar can be found
in cellphones, where you can call a name by clicking
a button and pronouncing the name of the receiver.
I thank you all for any advice.

Franz