Patent ID: 11901642
Assignee: SEESCAN, INC.
Field: Telecommunications (Electrical engineering)
Classification: CPC G  H | IPC H

Claim 3:
4. A method of electronically processing magnetic field signals in a buried utility locator, comprising:
receiving at six or more magnetic field sensing antenna coils magnetic field antenna signals and providing the received magnetic field antenna signals to corresponding antenna outputs; and
receiving, in a signal processing circuit including a plurality of receiver channel circuits having inputs operatively coupled to the corresponding antenna outputs, the antenna output signals and providing corresponding receiver channel outputs;
receiving, at a multiplexing circuit operatively coupled to the receiver channel circuits, the receiver channel outputs;
time division multiplexing the receiver channel outputs and providing one or more multiplexed output signals at multiplexing circuit outputs;
receiving, at one or more connected amplifiers, with at least one connected amplifier operatively coupled to one or more outputs of the multiplexing circuit, multiplexed outputs;
providing the multiplexed outputs to one or more analog-to-digital converters operatively coupled to the multiplexed outputs, wherein the total number of analog-to digital converters is smaller than the number of antenna coils and receiver channel circuits and wherein the analog-to digital converters include outputs;
digitizing the analog-to-digital converter outputs; and
storing the digitized analog-to-digital converter outputs in a non-transitory memory;
wherein the receiver channel circuits include a low pass filter circuit configured so as to couple a signal path to ground rather than being differentially coupled to the multiplexing circuit.