Key senators have reached a compromise on a bill that would delay the nation's switch to all-digital television from next month until June 12. A vote on the legislation is expected early next week. Sen. John D. Rockefeller (D-W.Va.), chairman of the Commerce Committee, has been working with ranking member Sen. Kay Bailey Hutchison (R-Tex.), to draft legislation that also would give consumers more access to coupons for the converter boxes needed to continue receiving broadcasts. Television broadcasters are scheduled to turn off analog signals Feb. 17. Consumers with an analog television will need a converter box to get broadcasts. People with digital televisions or cable or satellite service will not lose programming. President Obama earlier this month urged Congress to postpone the transition due to mounting evidence that consumers are not prepared. The Nielsen Co. said Thursday that more than 6.5 million U.S. households are still not prepared for the upcoming transition and could see their television sets go dark next month.