Microcomputer-based carrier detection system for a cordless telephone by comparing an output signal which contains signals no higher in frequency with a frequency threshold value

摘要: A microcomputer in a radio frequency (RF) signal receiver, such as cordless telephone set, periodically samples received baseband audio to determine its content. The uses at least one predetermined threshold value, and determines that the RF is present if output contains signals no higher absent than value. circuit useful either base unit or handunit of set.