Signal processing for acoustic user input

摘要

An electronic apparatus has a transmitter arranged to transmit an acoustic signal. It also has a receiver, for receiving acoustic energy comprising a reflection of the acoustic signal from an input object. It generates an electronic received signal from the received acoustic energy. The apparatus has processing means arranged to: (i) analyze at least a portion of the received signal to determine a linear combination of basis functions which represents an interference component in the received signal; (ii) use the determined linear combination to attenuate interference within the received signal, to give a post-attenuation signal; and (iii) use the post-attenuation signal to determine a user input to the electronic apparatus.

主权项

1. An electronic apparatus comprising:
a transmitting arrangement, arranged to transmit an acoustic signal; a receiving arrangement, arranged to receive acoustic energy comprising a reflection of the acoustic signal from an input object, and to generate an electronic received signal therefrom; and a processing arrangement, arranged to:
analyse a first portion of the received signal and to identify a set of basis functions based on said analysis, wherein the first portion of the received signal contains substantially no energy arising from transmissions from the electronic apparatus;analyse at least a second portion of the received signal to determine a linear combination of said basis functions which represents an interference component in the received signal arising from a source other than the electronic apparatus;use the determined linear combination to attenuate interference within the received signal, to give a post-attenuation signal; anduse the post-attenuation signal to determine a user input to the electronic apparatus.