AUDIO DETECTION SYSTEM AND METHODS

• US 20160302010A1
• Filed: 04/12/2016
• Published: 10/13/2016
• Est. Priority Date: 04/13/2015
• Status: Active Grant

• Current Assignee: Dscg Solutions, Inc.
• Original Assignee: Dscg Solutions, Inc.
• Inventors: SEBASTIAN, Richard, BELSLEY, Kendall
• Granted Patent: US 9,877,114 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01S 17/58 Velocity or trajectory determination systems; Sense-of-movement determination systems
• CPC Class Codes: G01S 7/4815 using multiple transmitters
• CPC Class Codes: G10L 25/18 the extracted parameters being spectral information of each sub-band
• CPC Class Codes: H04R 23/008 using optical signals for detecting or generating sound
• CPC Class Codes: H04R 2499/13 Acoustic transducers and sound field adaptation in vehicles
• CPC Class Codes: H04R 25/407 Circuits for combining signals of a plurality of transducers
• CPC Class Codes: H04R 27/00 Public address systems circuits for preventing acoustic reaction H04R3/02; circuits for distributing signals to loudspeakers H04R3/12; monitoring or testing arrangements for public address systems H04R29/007; amplifiers H03F
• CPC Class Codes: H04R 3/005 for combining the signals of two or more microphones specially adapted for hearing aids H04R25/407

Abstract

A laser microphone can include a detection system including plurality of laser subsystems. The detection system can be configured to produce emitted electromagnetic radiation based on a frequency pattern and receive reflected electromagnetic radiation reflected from an object. The detection system can be configured to define combined frequency data based on a frequency of the emitted, electromagnetic radiation and a frequency of the reflected electromagnetic radiation. The detection system can be configured to define a set of spectral bins in a frequency domain based on the combined frequency data, modify the combined frequency data based on a datapoint obtained from a subset of the set of spectral bins, and define at least one of a range or a velocity based on the combined frequency data. The laser microphone can include an audio processor configured to define an audio signal based on the at least one of the range or velocity.

Claims

1. A laser microphone, comprising:

a detection system including plurality of laser subsystems, the detection system configured to;

produce emitted electromagnetic radiation based on a frequency pattern, receive reflected electromagnetic radiation reflected from an object, define combined frequency data based on a frequency of the emitted, electromagnetic radiation and a frequency of the reflected electromagnetic radiation, define a set of spectral bins in a frequency domain based on the combined frequency data,

modify the combined frequency data based on a datapoint obtained from a subset of the set of spectral bins, and

defining at least one of a range or a velocity based on the combined frequency data; and

an audio processor configured to define an audio signal based on the at least one of the range or the velocity.

2. The laser microphone of claim 1, wherein the set of spectral bins is based on a Fourier transform.

3. The laser microphone of claim 1, further comprising:

defining a frequency based on the set of spectral bins.

4. The laser microphone of claim 1, further comprising:

identifying a subset of the set of spectral bins.

5. The laser microphone of claim 4, wherein the identifying the subset of the set of spectral bins is based on a criteria related to a number of spectral bins adjacent a maximum spectral bin.

6. The laser microphone of claim 4, further comprising:

producing time series data based on the subset of the set of spectral bins using an inverse Fourier transform.

7. The laser microphone of claim 6, further comprising:

defining phase angle data based on the time series data.

8. The laser microphone of claim 7, further comprising:

identifying the datapoint from the phase angle data as an outlier.

9. The laser microphone of claim 1, further comprising:

dividing the combined frequency data into at least a first segment of combined frequency data and a second segment of combined frequency data,

the defining of the set of spectral bins is based on the first segment of the combined frequency data.

10. The laser microphone of claim 9, further comprising:

identifying the first segment of the combined frequency data as an outlier segment of the combined frequency data.

11. An audio system, comprising:

a detection system including;

a laser configured to produce emitted electromagnetic radiation based on a frequency pattern,

a receiver configured to receive reflected electromagnetic radiation reflected from an object, and

an analyzer configured to define combined frequency data based on a frequency of the emitted electromagnetic radiation and a frequency of the reflected electromagnetic radiation, the analyzer configured to iteratively perform spectral analysis on the combined frequency data until a beat frequency is determined based on a threshold condition; and

an audio processor configured to define an audio signal based on the beat frequency.

12. The audio system of claim 11, wherein the spectral analysis includes:

defining a set of spectral bins, based on a Fourier transform, in a frequency domain based on the combined frequency data; and

identifying a subset of the set of spectral bins.

13. The audio system of claim 12, wherein the identifying the subset of the set of spectral bins is based on a number of spectral bins adjacent a maximum spectral bin.

14. The audio system of claim 11, wherein the spectral analysis includes producing time series data based on a set of spectral bins using an inverse Fourier transform.

15. The audio system of claim 11, wherein the spectral analysis includes defining phase angle data based on time series data.

16. The audio system of claim 11, wherein the spectral analysis includes identifying a datapoint from phase angle data as an outlier.

17. The audio system of claim 16, wherein the spectral analysis includes modifying the combined frequency data based on the datapoint.

18. The audio system of claim 11, wherein the spectral analysis includes:

dividing the combined frequency data into at least a first segment of combined frequency data and a second segment of combined frequency data.

19. The audio system of claim 11, wherein the threshold condition includes performing a specified number of iterations.

20. A method, comprising:

defining combined frequency data based on a frequency of electromagnetic radiation emitted toward an object from a laser and a frequency of electromagnetic radiation reflected from the object;

defining a set of spectral bins based on the combined frequency data;

identifying a subset of the set of spectral bins;

producing time series data based on the subset of the set of spectral bins defining phase angle data based on the time series data;

modifying the combined frequency data based on the phase angle data; and

defining an audio signal based on the combined frequency data.

21. The method of claim 20, wherein the identifying the subset of the set of spectral bins is based on a criteria related to a number of spectral bins adjacent a maximum spectral bin.

22. The method of claim 20, wherein the set of spectral bins is defined using a Fourier transform in a frequency domain, and the producing time series data is based on the subset of the set of spectral bins using an inverse Fourier transform.