Patent ID: 8004997

Claim:
An apparatus in a receiving device for generating path length information for first and second receive paths, comprising: first and second filters coupled to the first and second receive paths for receiving communication signals and providing first and second filter outputs passing only those communication signals having first and second DC voltage values at about a zero frequency, the first and second DC voltage values representative of lengths of the first and second receive paths, wherein the communication signals are generated by a transmitter coupled to the receiving device, the transmitter configured to determine the first and second DC voltage values based on the lengths of the first and second receive paths and to transmit the first and second DC voltage values onto the first and second receive paths, the first and second receive paths being output paths of the transmitter; and a path length determination circuit coupled to the first and second filter outputs, the path length determination circuit comprising first and second Analog to Digital (A/D) converters coupled to the first and second filters for converting the first and second DC voltage values indicating the lengths of the first and second receive paths into first and second digital values.