Patent ID: 6721352
Filing Date: 2004-04-13
Classification: H04H,H04N

Abstract:
In a communications system for transmitting forward and reverse signals, the reverse signals including carrier signals and noise signals, the communications system including a dynamic switch, the dynamic switch comprising:an input port for receiving a first reverse signal from a first portion of the communications system, wherein the first reverse signal is represented as an analog waveform; an analog-to-digital converter for converting the first reverse signal to a digital signal, the digital signal including a plurality of digital bits; a carrier-detect device coupled to the input port for detecting the presence of at least one carrier signal, the carrier-detect device comprising: a peak detector for detecting a peak level of the analog waveform and for providing a peak envelope signal; an analog-to-digital converter for digitizing the peak envelope signal; and a carrier-detect logic circuit for determining whether the digitized peak envelope signal includes the at least one carrier signal by comparing the digitized peak envelope signal to a threshold power level during a detection period and for providing an enable signal when the at least one carrier signal is detected; and a buffer for temporarily storing the plurality of digital bits and for outputting the plurality of digital bits when the enable signal is received; a digital-to-analog converter for receiving the plurality of digital bits from the buffer and for converting the plurality of digital bits into a second reverse signal corresponding to the first reverse signal; and an output port for providing the second reverse signal to a second portion of the communications system.