Patent ID: 9749764
Date: 2017-08-29
CPC Classifications: H04M,H04R,H04W

Claim:
1. An accessory for affecting one or more features of a portable electronic device that can be brought into a vicinity having a radio with a spaced pair of speakers, the accessory comprising: a sender for initiating at a time reference transmission of an RF test signal at said portable electronic device, said RF test signal being arranged to cause said radio to produce a distinct pair of audio responses from the spaced pair of speakers; and a discriminator for determining for the spaced pair of speakers the return delay between transmission of said RF test signal and arrival of the distinct pair of audio responses at said portable electronic device, said discriminator operable to use the return delay relative to the time reference to produce a pair of data corresponding to absolute distances of the portable electronic device from the spaced pair of speakers.