Big-screen monitors can now be mounted on the walls of homes, along with surround-sound speakers, but the result is often an unsightly jumble of wires leading to satellite receivers, amplifiers, DVD players and the like. On Wednesday, Sony and Samsung announced that they plan to address the issue by adopting as an industry standard a technology called Wireless Home Digital Interface (WHDI), developed by Amimon Ltd. of Israel. The technology had already received a boost from Motorola, Sharp and Hitachi. High-definition television sets using the WHDI technology are likely to become available in 2009, costing about $100 more than comparable sets now on sale, although the price is expected to drop as the technology matures. However, unless they can be brought into the fold, Matsushita (Panasonic), LG, Toshiba, and NEC are planning to produce their own sets using a similar wireless system called SiBeam.