Vibration Compensation Based on Identification of Vibration Frequency

• US 20080262658A1
• Filed: 04/17/2007
• Published: 10/23/2008
• Est. Priority Date: 04/17/2007
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Ooi, KianKeong, Cao, ShuYu, Wu, YiLei, Liu, KeXiu, Ding, Mingzhong
• Granted Patent: US 7,596,795 B2
• Time in Patent Office: Days
• US Class Current: 700/280
• CPC Class Codes: G11B 19/042 due to external shock or vibration

Abstract

A shock detection circuit housed in an electronic device includes an output shock signal that is indicative of vibration amplitude. To compensate for vibrations that are experienced by the electronic device, the output shock signal is analyzed. The analysis of the output shock signal allows a vibration frequency of the output shock signal to be identified and used in vibration compensation.

Claims

1. A method comprising:

obtaining an output shock signal from a shock detection circuit, wherein the output shock signal is indicative of vibration amplitude;

analyzing the output shock signal by applying a sampling technique to the output shock signal; and

identifying a vibration frequency of the output shock signal based on the analyzed output shock signal, the identified vibration frequency configured for use in vibration compensation.

2. The method of claim 1, wherein the output shock signal obtained is a digital output shock signal.

3. The method of claim 2, wherein obtaining the digital output shock signal by applying the sampling technique to the output shock signal comprises:

comparing the output shock signal to a predetermined threshold value to obtain the digital output shock signal.

4. The method of claim 2, wherein analyzing the digital output shock signal by applying the sampling technique to the output shock signal comprises:

capturing a plurality of time values between each rising edge of the digital output signal.

5. The method of claim 2, wherein analyzing the digital output shock signal by applying the sampling technique to the digital output shock signal comprises:

filtering the plurality of time values of each rising edge of the digital output signal to eliminate select time values between each rising edge of the digital output signal that are due to high frequency noise.

6. The method of claim 1, wherein the output shock signal obtained is an analog output shock signal.

7. The method of claim 6, wherein analyzing the analog output shock signal by applying the sampling technique to the analog output shock signal comprises:

filtering the analog output shock signal with a low-pass filter.

8. The method of claim 7, wherein analyzing the analog output shock signal by applying the sampling technique to the analog output shock signal comprises:

sampling a filtered analog to digital converter (ADC) channel output of the filtered analog output shock signal.

9. The method of claim 8, wherein analyzing the analog output shock signal by applying the sampling technique to the analog output shock signal comprises:

detecting signal peaks of the filtered ADC channel output based on positive to negative gradient changes.

10. The method of claim 9, wherein analyzing the analog output shock signal by applying the sampling technique to the output shock signal comprises:

determining a time value between signal peaks.

11. A method comprising:

obtaining an output signal from a shock detection circuit, wherein the output signal is indicative of vibration amplitude;

identifying a vibration frequency of the vibration based on the output signal; and

compensating vibration in an electronic component using the identified vibration frequency.

12. The method of claim 11, wherein the output signal is a digital output signal and identifying the vibration frequency of the vibration signal from the shock detection circuit comprises:

capturing a plurality of time values between each rising edge of the digital output signal.

13. The method of claim 12, wherein identifying the vibration frequency of the vibration signal from the shock detection circuit comprises:

filtering the plurality of time values of each rising edge of the digital output signal to eliminate select time values between each rising edge of the digital output signal that are due to high frequency noise.

14. The method of claim 11, wherein identifying the vibration frequency of the vibration signal from the shock detection circuit comprises:

sampling a filtered analog to digital converter (ADC) channel output of a filtered analog output shock signal;

detecting signal peaks of the filtered ADC channel output based on positive to negative gradient changes; and

determining a time value between signal peaks.

15. The method of claim 11, wherein the vibration identified comprises one of a ring-tone vibration frequency and a vibrator alert vibration frequency.

17. The electronic component of claim 15, wherein the microcontroller is configured to:

capture a plurality of time values between each rising edge of the output shock signal; and

filter the plurality of time values of each rising edge of the output signal to eliminate select time values between each rising edge of the output signal that are due to high frequency noise.

18. The electronic component of claim 15, wherein the microcontroller is configured to:

detect signal peaks of a filtered output shock signal based on positive to negative gradient changes; and

determine a time value between signal peaks.

19. The electronic component of claim 18, wherein the microcontroller is further configured to:

filter the output shock signal with an analog to digital converter channel to obtain the filtered output shock signal.

20. The electronic component of claim 15, wherein the servo controller is configured to process the identified vibration frequency directly into a servo control loop.

16. An electronic component comprising:

a shock detection circuit configured to output an output signal, the output signal indicative of vibration amplitude;

a first controller configured to receive the output signal and to identify a vibration frequency of the vibration based on the output signal; and

a second controller configured to receive the identified vibration frequency of the vibration and to compensate the vibration.