Systems And Methods For A Wavelet Transform Viewer

• US 20090323049A1
• Filed: 10/10/2008
• Published: 12/31/2009
• Est. Priority Date: 06/30/2008
• Status: Active Grant

• Current Assignee: Nellcor Puritan Bennett Ireland
• Original Assignee: Nellcor Puritan Bennett Ireland
• Inventors: Addison, Paul Stanley, Watson, James
• Granted Patent: US 7,944,551 B2
• Time in Patent Office: Days
• US Class Current: 356/41
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/7225 Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation A61B5/30, A61B5/316 take precedence; transformers for specific applications H01F38/00; amplifiers H03F
• CPC Class Codes: A61B 5/726 using Wavelet transforms
• CPC Class Codes: A61B 5/742 using visual displays A61B5/339 takes precedence
• CPC Class Codes: G06T 2207/20064 Wavelet transform [DWT]
• CPC Class Codes: G06T 2207/30076 Plethysmography
• CPC Class Codes: G06T 5/10 using non-spatial domain filtering
• CPC Class Codes: G16H 40/63 for local operation

Abstract

Techniques for the display of a signal with a wavelet transform of that signal in a wavelet transform viewer are disclosed, according to embodiments. According to embodiments, the wavelet transform viewer can display a plot of physiological signals such as a photoplethysmograph (PPG) signal. A portion of the plot of the signal can be selected. A wavelet transform the selected portion of the signal can be calculated and a wavelet plot of the tranformed signal can be displayed simultaneously with that signal. A plot of the selected portion of the signal can also be simultaneously displayed with both the plot of the signal and the wavelet plot.

Claims

1. A method for displaying a signal in a wavelet transform viewer, the method comprising:

receiving a signal;

receiving a selection of a portion of the signal;

transforming the selected portion of the signal using a wavelet transform to generate a transformed signal;

generating a wavelet plot based on the transformed signal; and

displaying the wavelet plot with the selected portion of the signal.

2. The method of claim 1 wherein the signal comprises a photoplethysmographic (PPG) signal.

3. The method of claim 1 wherein the wavelet plot comprises a continuous wavelet scalogram of the transformed signal.

4. The method of claim 1 wherein the wavelet plot comprises a plot of a phase of the transformed signal, a real part of the transformed signal, an imaginary part of the transformed signal, and/or a cross-correlation between the transformed signal and a second signal, and/or combinations thereof.

5. The method of claim 1 wherein the selected portion of the signal is adjustable.

6. The method of claim 1 further comprising displaying the received signal with the selected portion of the signal and the wavelet plot.

7. The method of claim 1 further comprising:

receiving a selection of a second portion of the signal;

transforming the selected second portion of the signal using a wavelet transform to generate a further transformed signal;

regenerating the wavelet plot based on the further transformed signal; and

replacing the displayed wavelet plot with the regenerated wavelet plot.

8. The method of claim 1 further comprising displaying at least one other signal with the wavelet plot and the selected portion of the signal.

9. The method of claim 1 further comprising displaying a wavelet plot of at least one other signal.

10. The method of claim 1 further comprising displaying the wavelet plot with the selected portion of the signal within a polysomnograph (PSG) display.

11. A wavelet transform viewer comprising:

a processor capable of;

receiving a signal;

receiving a selection of a portion of the signal;

transforming the selected portion of the signal using a wavelet transform to generate a transformed signal;

generating a wavelet plot based on the transformed signal; and

a display capable of displaying the wavelet plot with the selected portion of the signal.

12. The wavelet transform viewer of claim 11 wherein the signal comprises a photoplethysmographic (PPG) signal.

13. The wavelet transform viewer of claim 11 wherein the wavelet plot comprises a continuous wavelet scalogram of the transformed signal.

14. The wavelet transform viewer of claim 11 wherein the wavelet plot comprises a plot of a phase of the transformed signal, a real part of the transformed signal, an imaginary part of the transformed signal, and/or a cross-correlation between the transformed signal and a second signal, and/or combinations thereof.

15. The wavelet transform viewer of claim 11 further comprising a control input capable of selecting and/or adjusting the selected portion of the signal.

16. The wavelet transform viewer of claim 11 wherein the display is further capable of displaying the received signal with the selected portion of the signal and the wavelet plot.

17. The wavelet transform viewer of claim 11 the processor further capable of:

receiving a selection of a second portion of the signal;

transforming the selected second portion of the signal using a wavelet transform to generate a further transformed signal;

regenerating the wavelet plot based on the further transformed signal; and

replacing the displayed wavelet plot with the regenerated wavelet plot.

18. The wavelet transform viewer of claim 11 wherein the display is further capable of displaying at least one other signal with the wavelet plot and the selected portion of the signal.

19. The wavelet transform viewer of claim 11 wherein the display is further capable of displaying a wavelet plot of at least one other signal.

20. The wavelet transform viewer of claim 11 wherein the display comprises a polysomnograph (PSG) display.

21. Computer-readable medium for use in displaying a signal in a wavelet transform viewer, the computer-readable medium having computer program instructions recorded thereon for:

receiving a signal;

receiving a selection of a portion of the signal;

transforming the selected portion of the signal using a wavelet transform to generate a transformed signal;

generating a wavelet plot based on the transformed signal; and

displaying the wavelet plot with the selected portion of the signal.