A digital squelch circuit for detecting valid data signals in a burst mode communication system, such as a packet-based local area network. Transitions in the input signal to the squelch circuit start a counter which asserts at least one signal a predetermined time from the transition. The absence or...http://www.google.de/patents/US5199049?utm_source=gb-gplus-sharePatent US5199049 - Circuit and method of digital carrier detection for burst mode communication systems
