METHODS AND SYSTEMS FOR IMPROVED MEASUREMENT, ENTITY AND PARAMETER ESTIMATION, AND PATH PROPAGATION EFFECT MEASUREMENT AND MITIGATION IN SOURCE SIGNAL SEPARATION

• US 20150287422A1
• Filed: 04/08/2015
• Published: 10/08/2015
• Est. Priority Date: 05/04/2012
• Status: Active Grant

• Current Assignee: XMOS Ltd.
• Original Assignee: Kaonyx Labs LLC
• Inventors: Short, Kevin M., Hone, Brian T., Stackley, Scott, Brunet, Pascal
• Granted Patent: US 10,497,381 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01S 13/723 by using numerical data
• CPC Class Codes: G01S 13/88 Radar or analogous systems specially adapted for specific applications electromagnetic prospecting or detecting of objects, e.g. near-field detection, G01V3/00
• CPC Class Codes: G01S 3/74 Multi-channel systems specially adapted for direction-finding, i.e. having a single antenna system capable of giving simultaneous indications of the directions of different signals systems in which the directions of different signals are determined sequentially and displayed simultaneously G01S3/04, G01S3/14
• CPC Class Codes: G01S 7/288 Coherent receivers
• CPC Class Codes: G01S 7/2883 using FFT processing
• CPC Class Codes: G10L 13/02 Methods for producing synthetic speech; Speech synthesisers
• CPC Class Codes: G10L 15/26 Speech to text systems G10L15/08 takes precedence
• CPC Class Codes: G10L 21/0272 Voice signal separating
• CPC Class Codes: H04R 3/00 Circuits for transducers , loudspeakers or microphones

Abstract

A method of processing a signal includes taking a signal recorded by a plurality of signal recorders, applying at least one super-resolution technique to the signal to produce an oscillator peak representation of the signal comprising a plurality of frequency components for a plurality of oscillator peaks, computing at least one Cross Channel Complex Spectral Phase Evolution (XCSPE) attribute for the signal to produce a measure of a spatial evolution of the plurality of oscillator peaks between the signal, identifying a known predicted XCSPE curve (PXC) trace corresponding to the frequency components and at least one XCSPE attribute of the plurality of oscillator peaks and utilizing the identified PXC trace to determine a spatial attribute corresponding to an origin of the signal.

Claims

1. A method of processing a signal comprising:

taking a signal recorded by a plurality of signal recorders;

applying at least one super-resolution technique to the signal to produce an oscillator peak representation of the signal comprising a plurality of frequency components for a plurality of oscillator peaks;

computing at least one Cross Channel Complex Spectral Phase Evolution (XCSPE) attribute for the signal to produce a measure of a spatial evolution of the plurality of oscillator peaks between the signal recorders;

identifying a predicted XCSPE curve (PXC) trace corresponding to the frequency components of the oscillator peaks and at least one XCSPE attribute of the plurality of oscillator peaks; and

utilizing the identified PXC trace to determine a spatial attribute corresponding to an origin of the signal.

2. The method of claim 1 wherein identifying the PXC trace comprises:

considering a plurality of possible PXC traces; and

measuring a sum squared distance between each of the plurality of the oscillator peaks and each of the plurality of possible PXC traces.

3. The method of claim 2 wherein the distance is the shorter of a direct distance and a wrap around distance.

4. The method of claim 2 wherein a subset of the plurality of possible PXC traces are utilized after a pre-selection process based, at least in part, on the geometry of the microphones.

5. The method of claim 2 wherein a subset of the plurality of possible PXC traces are utilized after a pre-selection process based, at least in part, on an attribute of the plurality of oscillator peaks.

6. The method of claim 1 wherein the at least one super-resolution technique is selected from the group consisting of XCSPE analysis and amplitude deviation correction for sigma.

7. The method of claim 1 wherein the spatial attribute is a direction.

8. A system comprising:

a plurality of signal recorders configured to receive a signal; and

a non-transient computer readable medium storing instructions that when executed by a processor cause the processor to;

apply at least one super-resolution technique to the signal to produce an oscillator peak representation of the signal comprising a plurality of frequency components for a plurality of oscillator peaks;

compute at least one Cross Channel Complex Spectral Phase Evolution (XCSPE) attribute for the signal to produce a measure of a spatial evolution of the plurality of oscillator peaks between the signal recorders;

identify a predicted XCSPE curve (PXC) trace corresponding to the frequency components of the oscillator peaks and at least one XCSPE attribute of the plurality of oscillator peaks; and

utilize the identified PXC trace to determine a spatial attribute corresponding to an origin of the signal.

9. The system of claim 8 wherein identifying the PXC trace comprises:

considering a plurality of possible PXC traces; and

measuring a sum squared distance between each of the plurality of the oscillator peaks and each of the plurality of possible PXC traces.

10. The system of claim 9 wherein the distance is the shorter of a direct distance and a wrap around distance.

11. The system of claim 9 wherein a subset of the plurality of possible PXC traces are utilized after a pre-selection process based, at least in part, on the geometry of the microphones.

12. The system of claim 9 wherein a subset of the plurality of possible PXC traces are utilized after a pre-selection process based, at least in part, on an attribute of the plurality of oscillator peaks.

13. The system of claim 8 wherein the at least one super-resolution technique is selected from the group consisting of XCSPE analysis and amplitude deviation correction for sigma.

14. The system of claim 8 wherein the spatial attribute is a direction.

15. A method of processing a signal comprising:

taking a signal recorded by a plurality of signal recorders;

applying at least one super-resolution technique to the signal to produce an oscillator peak representation of the signal comprising a plurality of frequency components for a plurality of oscillator peaks;

computing at least one Cross Channel Complex Spectral Phase Evolution (XCSPE) attribute for the signal to produce a measure of a spatial evolution of the plurality of oscillator peaks between the signal recorders;

identifying a known predicted XCSPE curve (PXC) trace corresponding to the frequency components and at least one XCSPE attribute of the plurality of oscillator peaks;

measuring deviations away from the PXC trace of a plotted position for each of the plurality of oscillator peaks; and

determining a path propagation effect (PPE) based, at least in part, on the deviations and an amount of reverberation in the original signal.

16. The method of claim 15 wherein the PPE comprises a phase related deviation.

17. The method of claim 16 further comprising utilizing the PPE to identify a signal emitting entity.

18. The method of claim 16 further comprising utilizing the PPE to remove an effect of reverberation from the signal.

19. The method of claim 15 wherein the PPE comprises an amplitude related deviation.

20. The method of claim 19 further comprising utilizing the PPE to identify a signal emitting entity.

21. The method of claim 19 further comprising utilizing the PPE to remove an effect of reverberation from the signal.