It is certainly true that voice guidance in TV sets is helpful, but there is another option.
There is a radio especially designed to guide blind people in locating and listening to TV on-the-air programs. This DTV radio is made by Oehm Electronics and costs $185. It is menu or command driven. One neat feature is the ability to tell the user how strong a signal is. This is useful when orienting the antenna. If the received signal falls below a critical level, the user will know that the reception of that station will be marginal at best.
This radio does not read what's on the air program information.
It seems to me to be a viable alternative to more expensive TV solutions.
Joe Giovanelli, W2PVY