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US 12,111,428 B2Granted
Acoustic distance ranging system
AssigneeShure Acquisition Holdings, Inc.
InventorsDavid Grant Cason, Mark Gilbert
Life of this patent
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Abstract
A wireless audio system configured to perform an acoustic ranging operation is disclosed. The audio system comprises an audio transmitter, and audio receiver, and is configured to determine a distance between the audio transmitter and the audio receiver.
Claims15
A method comprising:
- operating an audio transmitter and an audio receiver using a common clock,
- transitioning, by the audio transmitter and at a first point in time, an audio ranging signal in a phase-continuous manner from a first frequency to remain at a second frequency for a predetermined duration;
- receiving, at a second point in time and by the audio receiver, the audio ranging signal transitioned from the first frequency to remain at the second frequency;
- determining a distance between the audio transmitter and the audio receiver based on:
- (1) a difference between the first point in time and the second point in time, and (2) a determined speed of sound;
- transitioning, by the audio transmitter and at a third point in time, the audio ranging signal in a phase-continuous manner from the second frequency to remain at a third frequency;
- receiving, at a fourth point in time and by the audio receiver, the audio ranging signal transitioned from the second frequency to remain at the third frequency;
- and
- correcting the distance to a modified distance between the audio transmitter and the audio receiver, comprising:
- measuring a duration of the transmission of the audio ranging signal at the second frequency, the duration comprising a difference between the fourth point in time and the second point in time;
- determining a correction to the distance based on a comparison between the measured duration and the predetermined duration;
- and
- updating the distance to the modified distance based on the correction.
10 more elements
A method of operating an audio transmitter, the method comprising:
- operating the audio transmitter using a common clock with an audio receiver;
- transmitting by the audio transmitter and to the audio receiver, an audio ranging signal having a first frequency;
- at a first point in time, transitioning the audio ranging signal in a phase-continuous manner from the first frequency to remain at a second frequency for a predetermined duration, wherein the audio ranging signal transitioned from the first frequency to remain at the second frequency is received by the audio receiver at a second point in time, and a distance between the audio transmitter and the audio receiver is determinable based on (1) a difference between the first point in time and the second point in time, and (2) a determined speed of sound;
- at a third point in time, transitioning the audio ranging signal in a phase-continuous manner from the second frequency to remain at a third frequency, wherein the audio ranging signal transitioned from the second frequency to remain at the third frequency is received by the audio receiver at a fourth point in time, and wherein the distance is corrected to a modified distance based on comparing the predetermined duration to a measured duration that comprises a difference between the fourth point in time and the second point in time.
1 more element
A method of operating an audio receiver, the method comprising:
- operating the audio receiver using a common clock with an audio transmitter;
- receiving, by the audio receiver, an audio ranging signal having a first frequency transmitted by the audio transmitter;
- and
- after an occurrence of a transmission, by the audio transmitter, of a transition of the audio ranging signal in a phase-continuous manner from the first frequency to remain at a second frequency at a first point in time for a predetermined duration, receiving, by the audio receiver at a second point in time, the transition of the audio ranging signal from the first frequency to remain at the second frequency, wherein a distance between the audio transmitter and the audio receiver is determinable based on (1) a difference between the first point in time and the second point in time, and (2) a determined speed of sound;
- after an occurrence of a transmission, by the audio transmitter, of a transition of the audio ranging signal in a phase-continuous manner from the second frequency to remain at a third frequency at a third point in time, receiving, by the audio receiver at a fourth point in time, the transition of the audio ranging signal from the second frequency to remain at the third frequency, wherein the distance is corrected to a modified distance based on comparing the predetermined duration to a measured duration that comprises a difference between the fourth point in time and the second point in time.
2 more elements
Dependencies are inferred from the claim text.