Device for removing interference signal with different characteristic and method for removing thereof

• US 20040223085A1
• Filed: 01/14/2004
• Published: 11/11/2004
• Est. Priority Date: 05/09/2003
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kwak, Jung-won
• Application Number:
  US10/756,464
• Publication Number:
  US 20040223085A1
• Time in Patent Office: Days
• US Class Current: 348/607
• CPC Class Codes: H04N 5/211 Ghost signal cancellation H04N23/81 takes precedence

Abstract

A device for removing an interference signal with a different characteristic included in input signals and an interference signal removing method are disclosed. The device for removing an interference signal comprises an IIR notch filter for generating a notch to remove the signal with a different characteristic included in the input signals, a frequency tracking unit for tracking a frequency in the frequency domain for the signal with a different characteristic included in the input signals to provide a position value of the notch, and a power ratio calculation unit for calculating a power ratio of the signal different from the input signals on the characteristic and providing a depth value of the notch set in correspondence with the calculated power ratio, wherein the IIR notch filter removes the signal with a different characteristic using the position value and the depth value. Accordingly, the signal with a different characteristic included in the input signals can be correctly removed.

Claims

1. A device for removing an interference signal, comprising:

an IIR notch filter configured to generate a notch to remove a signal with a different characteristic included in input signals;

a frequency tracking unit configured to track a frequency in the frequency domain for the signal with a different characteristic included in the input signals to provide a position value of the notch; and

a power ratio calculation unit configured to calculate a power ratio of the signal with a different characteristic included in the input signals and providing a depth value of the notch, which is set in correspondence with the calculated power ratio,

wherein the IIR notch filter generates the notch corresponding to the signal with a different characteristic using the position value and the depth value.

2. The device according to claim 1, wherein the frequency tracking unit uses an ALE (Adaptive Line Enhancer) algorithm.

3. The device according to claim 1, wherein the power ratio calculation unit provides the IIR notch filter with the depth value and width value of the notch, which are set in correspondence with the calculated power ratio.

4. The device according to claim 3, wherein at least one of the position value, the depth value and the width value is a preset value.

5. The device according to claim 1, wherein the transfer function, H(z), of the IIR notch filter is defined as follows:

6. A method for removing a signal with a different characteristic, comprising:

tracking a frequency in the frequency domain for a signal with a different characteristic included in input signals to acquire a position value of a notch;

calculating a power ratio of the signal with a different characteristic included in the input signals and acquiring a depth value of the notch which is set in correspondence with the power ratio; and

filtering the input signals by generating the notch corresponding to the signal with a different characteristic using the position value and the depth value to remove the signal with a different characteristic.

7. The method according to claim 6, wherein an ALE (Adaptive Line Enhancer) algorithm is used in the tracking operation.

8. The method according to claim 6, wherein the depth value and a width value of the notch which are set in correspondence with the calculated power ratio are acquired, and the signal with a different characteristic is removed using the position value, the depth value and the width value.

9. The method according to claim 8, wherein at least one of the position value, the depth value and the width value is a preset value.

10. The method according to claim 6, wherein the transfer function, H(z), in the filtering operation is defined as follows:

11. A device for removing an interference signal, comprising:

a first filtering unit comprising;

a first frequency tracking unit configured to track a frequency in the frequency domain for a first signal with a different characteristic included in input signals to provide a first position value,

a first power ratio calculation unit configured to calculate a first power ratio of the first signal with a different characteristic and providing a first depth value of the notch set in correspondence with the calculated first power ratio, and

a first IIR notch filter configured to remove the first signal with a different characteristic based on the first position value and the first depth value;

a second filtering unit comprising;

a second frequency tracking unit configured to track a frequency in the frequency domain for a second signal with a different characteristic included in the input signals to provide a second position value,

a second power ratio calculation unit configured to calculate a second power ratio of the second signal with a different characteristic and providing a second depth value set correspondingly to the calculated second power ratio, and

a second IIR notch filter configure to remove the second signal with a different characteristic based on the second position value and the second depth value; and

a third filtering unit comprising;

a third frequency tracking unit configured to track a frequency in the frequency domain for a third signal with a different characteristic included in the input signals to provide a third position value,

a third power ratio calculation unit configured to calculate a third power ratio of the third signal with a different characteristic and providing a third depth value set in correspondence with the calculated third power ratio, and

a third IIR notch filter configured to remove the third signal with a different characteristic based on the third position value and the third depth value.

12. The device according to claim 11, wherein each frequency tracking unit uses an ALE (Adaptive Line Enhancer) algorithm.

13. The device according to claim 11, wherein each power ratio calculation unit provides each IIR notch filter with the depth value and width value of the notch set in correspondence with the calculated power ratio.

14. The device according to claim 13, wherein at least one of each position value, depth value and width value is a preset value.

15. The device according to claim 11, wherein the transfer function, H(z), of each IIR notch filter is defined as follows:

16. A method for removing an interference signal, comprising:

removing a first signal with a different characteristic, using a first position value acquired by tracking a frequency in the frequency domain for the first signal with a different characteristic included in input signals and a first depth value of the notch set in correspondence with a first power ratio calculated for the first signal with a different characteristic; and

removing a second signal with a different characteristic, using a second position value acquired by tracking a frequency in the frequency domain for the second signal with a different characteristic included in the input signals and a second depth value of the notch set in correspondence with a second power ratio calculated for the second signal with a different characteristic.

17. The method according to claim 16, wherein each filtering step acquires each position value using an ALE (Adaptive Line Enhancer) algorithm.

18. The method according to claim 16, wherein each filtering step removes the respective signal with a different characteristic using the position value, the depth value, and the width value of the notch preset in correspondence with the power ratio calculated for the respective signal with a different characteristic.

19. The method according to claim 18, wherein the respective position values, depth values and width values are preset values.

20. The method according to claim 16, wherein the transfer function, H(z), of each filtering step is defined as follows:

21. A device for removing an interference signal, comprising:

a frequency tracking unit configured to track a frequency in a frequency domain for a signal with a different characteristic included in input signals to provide a first position value;

a power ratio calculation unit configured to calculate a power ratio of the first signal with a different characteristic and providing a first depth value set in correspondence with the calculated power ratio;

a first IIR notch filter configured to remove the first signal with a different characteristic based on the first position value and the first depth value; and

a second IIR notch filter configured to remove a second signal with a different characteristic included in the input signals based on a second position value and a second depth value,

wherein the frequency tracking unit provides the second IIR notch filter with the second position value obtained by adding a first predetermined value to the first position value, and the power ratio calculation unit provides the second IIR notch filter with the second depth value obtained by adding a second predetermined value to the first depth value.

22. The device according to claim 21, wherein the first predetermined value is a value corresponding to a frequency difference between the first signal with a different characteristic and the second signal with a different characteristic in the frequency domain, and the second predetermined value is a value corresponding to the power ratio of the first signal with a different characteristic and the second signal with a different characteristic.

23. The device according to claim 21, wherein the frequency tracking unit uses an ALE (Adaptive Line Enhancer) algorithm.

24. The device according to claim 21, wherein the power calculation unit provides the first IIR notch filter with the first depth value and the first width value set in correspondence with the calculated power ratio of the first signal with a different characteristic and provides the second IIR notch filter with the second depth value and the second width value obtained by respectively adding the second predetermined value to the first depth value and the first width value.

25. The device according to claim 21, wherein the transfer function, H(z), of each notch filter is defined as follows:

26. A method for removing an interference signal, comprising:

tracking a frequency in the frequency domain for a signal with a different characteristic included in input signals to acquire a first position value;

calculating a power ratio of the first signal with a different characteristic and acquiring a first depth value set in correspondence with the calculated power ratio;

removing the first signal with a different characteristic on the basis of the first position value and the first depth value; and

removing a second signal with a different characteristic included in the input signals using a second position value and a second depth value,

wherein the second position value is obtained by adding a first predetermined value to the first position value, and the second depth value is obtained by adding a second predetermined value to the first depth value.

27. The method according to claim 26, wherein the first predetermined value is a value corresponding to a frequency difference between the first signal with a different characteristic and the second signal with a different characteristic in the frequency domain, and the second predetermined value is a value corresponding to the power ratio of the first signal with a different characteristic and the second signal with a different characteristic.

28. The method according to claim 26, wherein the tracking operation uses an ALE (Adaptive Line Enhancer) algorithm.

29. The method according to claim 26, wherein the depth value acquisition step provides the first depth value and the first width value set in correspondence with the calculated power ratio of the first signal with a different characteristic, and provides the second depth value and the second width value respectively obtained by respectively adding the second predetermined value to the first depth value and the first width value to the second filtering step.

30. The method according to claim 26, wherein the transfer function, H(z), of each filtering step is defined as follows: