Advanced hearing aid

  My wife is hard of hearing, even with a new digital hearing aid she has trouble to hear the phone, door bell etc. My idea is to use a PC/software linked to the various peripherals and then using a wi-fi like transmitter to broadcast to a specialized hearing aid. The transmitted data could be code to the hearing aid so this would activate a sound file in the hearing aid. Anything could be linked like door bell, baby alarm, cooker, fire alarm etc. etc.