Comment by bluGill

Systems like that have existed for decades in various versions. The only blind people who use them are people who went blind as an adult - and then often only the investor. People who went blind young have learned to deal with the world and discover technology like that is more annoying than helpful.

Dogs and canes work very well and solve most of the problem. It doesn't really matter if they are walking into a wall, piano or door - they need to know to avoid it. If you want useful sounds require every traffic light to have beeps when it is safe to cross loud enough to be heard across the street - because that is a real problem blind people have in navigating. Most of the rest of the world is forgiving to the types of mistakes blind people make and so they don't really need help.

The other way you can help the blind is just be willing to give directions from the sidewalk in front of a building to the front door.