Granted Patent B2

US 9,260,261 · App. 13/786,502 · Granted Feb 16, 2016

Abstract

Claims (31)

1. A method of indicating a medium jam along a medium transport path comprising:

(a) one or more rollers for use in conveying the medium along the medium transport path;

(b) a microphone for detecting the sound of the medium being conveyed and producing a signal representing the sound;

(c) a processor for producing sound values from the signal and:

(i) computing a moving window sum responsive to the sound values;

(ii) computing a high amplitude count responsive to the sound values; and

(iii) computing a post roller sum responsive to the sound values; and

(d) indicating the medium jam responsive to the moving window sum, high amplitude count, or post roller sum.

2. The method of claim 1 wherein (c) (i) includes computing the sum of sound values using a given window width.

3. The method of claim 1 wherein (c) (ii) includes computing the sum of sound values that are greater than a high amplitude sound threshold value.

4. The method of claim 1 wherein (c) (iii) includes computing a sum of sound values from a region of the medium transport path after one of the rollers.

5. The method of claim 1 wherein (d) includes indicating a medium jam when the moving window sum is greater than a moving window sum threshold value.

6. The method of claim 1 wherein (d) includes indicating a medium jam when the high amplitude count is greater than a high amplitude count threshold value.

7. The method of claim 1 wherein (d) includes indicating a medium jam when the post roller sum is greater than a post roller sum threshold value.

8. A method of indicating a medium jam along a medium transport path comprising:

(a) one or more rollers for use in conveying the medium along the medium transport path;

(b) a microphone for detecting the sound of the medium being conveyed and producing a signal representing the sound;

(c) a processor for producing sound values from the signal and:

(i) computing a moving window sum responsive to the sound values;

(ii) computing a high amplitude count responsive to the sound values;

(iii) computing a post roller sum responsive to the sound values; and

(iv) computing a pre roller sum responsive to the sound values; and

(d) indicating the medium jam responsive to the moving window sum, high amplitude count, post roller sum, or pre roller sum.

9. The method of claim 8 wherein (c) (i) includes computing the sum of sound values using a given window width.

10. The method of claim 8 wherein (c) (ii) includes computing the sum of sound values that are greater than a high amplitude sound threshold value.

11. The method of claim 8 wherein (c) (iii) includes computing a sum of sound values from a region of the medium transport path after one of the rollers.

12. The method of claim 8 wherein (c) (iv) includes computing a sum of sound values from a region of the medium transport path before one of the rollers.

13. The method of claim 8 wherein (d) includes indicating a medium jam when the moving window sum is greater than a moving window sum threshold value.

14. The method of claim 8 wherein (d) includes indicating a medium jam when the high amplitude count is greater than a high amplitude count threshold value.

15. The method of claim 8 wherein (d) includes indicating a medium jam when the post roller sum is greater than a post roller sum threshold value.

16. The method of claim 8 wherein (d) includes indicating a medium jam when the pre roller sum is greater than a pre roller sum threshold value.

Assignments (12)