Methods and apparatus for utilizing radio frequency spectrum simultaneously and concurrently in the presence of co-channel and/or adjacent channel television signals

摘要: To address the scarcity of radio frequency (RF) spectrum, disclosed systems offer unique ways to mitigate interference between television broadcasters (including their direct audience and viewers served via cable television) other concurrent users RF e.g. for one-way or two-way wireless communication. A preferred embodiment makes use “framing” characteristics “letterbox” video display format. emissions simultaneous spectrum user are keyed “on” only substantially during time intervals when blanking and/or letterbox-border lines being scanned on display, i.e. potentially affected (interfered with) is in letterbox-frame-scanning portions each field. The uses may support services voice telephony, music etc.), data Internet, intranet, etc.); image control; fixed, portable, mobile nomadic; narrowband, broadband ultra-wideband; radiodetermination, diathermy, etc.