Acoustic-based positioning with dynamic frequency pilot tone

A method of wireless communication at a wireless device, comprising:

• transmitting a first pilot tone via a first speaker at a first frequency;
• detecting whether there is an object within a specified distance of the wireless device based on a reflected signal of the first pilot tone;
• transmitting a second pilot tone via a second speaker at a second frequency based on at least one object being detected within the specified distance, wherein the second frequency is higher than the first frequency;
• detecting that the at least one object is approaching the first speaker;
• and
• switching transmission of the first pilot tone to the second speaker and transmission of the second pilot tone to the first speaker based on the at least one object approaching the first speaker.

An apparatus for wireless communication at a wireless device, comprising:

• means for transmitting a first pilot tone via a first speaker at a first frequency;
• means for detecting whether there is an object within a specified distance of the wireless device based on a reflected signal of the first pilot tone;
• means for transmitting a second pilot tone via a second speaker at a second frequency based on at least one object being detected within the specified distance, wherein the second frequency is higher than the first frequency;
• means for detecting that the at least one object is approaching the first speaker;
• and
• means for switching transmission of the first pilot tone to the second speaker and transmission of the second pilot tone to the first speaker based on the at least one object approaching the first speaker.

A non-transitory computer-readable medium storing computer executable code at a wireless device, the code when executed by a processor causes the processor to:

• transmit a first pilot tone via a first speaker at a first frequency;
• detect whether there is an object within a specified distance of the wireless device based on a reflected signal of the first pilot tone;
• transmit a second pilot tone via a second speaker at a second frequency based on at least one object being detected within the specified distance, wherein the second frequency is higher than the first frequency;
• detect that the at least one object is approaching the first speaker;
• and
• switch transmission of the first pilot tone to the second speaker and transmission of the second pilot tone to the first speaker based on the at least one object approaching the first speaker.