LOUIS W. PARKER, 87, a millionaire inventor who revolutionized television sound and whose innovations helped Apollo astronauts walk on the moon, died Monday in Fort Lauderdale. He was also known for his philanthropy and for donating $1.1-million for construction of the 1,200-seat Parker Playhouse in Fort Lauderdale. He held more than 250 patents on electronic devices worldwide _ from a meter that allowed moon-walking astronauts to monitor how long their air supply would last, to an electric car. His most successful invention was called an Intercarrier Sound System. Designed for television sets, it synchronized sound with picture in 1947 and soon was the standard in the industry. His first patent, for a reusable circuit breaker, was issued at age 12.