Multiple-path noise cancellation

摘要

A communication device, such as a smartphone or tablet, includes a communication interface with noise cancellation logic. The noise cancellation logic includes a lead path and a reference path. A signal source provides a signal to the lead path and the references path. The signal is amplified along the lead path and the reference path. Distortion is imparted onto the signal during amplification on the lead path. A correction signal based on the difference between the amplified signal on the lead path and the amplified signal on the reference path is generated by the noise cancellation logic. The correction signal may reflect to distortion imparted during amplification on the lead path. The correction signal is differentially combined with the amplified signal on the lead path to attempt to remove the distortion and generate an output.

主权项

1. A device, comprising:
a first path configured to receive an input signal, the first path comprising a first amplifier, the first path configured to produce a first signal based on the input signal and a first distortion imparted by the first amplifier; a second path configured to receive the input signal, the second path comprising a second amplifier, the second path configured to produce a second signal based on the input signal and a second distortion imparted by the second amplifier; a first combiner connected to the first and second paths, the first combiner configured to combine the first and second signals to produce a correction signal based on a difference between the first and second distortion; and a second combiner connected to the first path and the first combiner, the second combiner configured to combine the first signal and the correction signal to generate an output signal.