System and method for sample rate adaption

• US 9,292,123 B2
• Filed: 02/15/2013
• Issued: 03/22/2016
• Est. Priority Date: 02/17/2012
• Status: Active Grant

• Current Assignee: Blackberry Limited
• Original Assignee: 2236008 Ontario Inc. (Blackberry Limited)
• Inventors: Savard, Patrick-Andre
• Primary Examiner(s): Moon, Seokyun
• Application Number:
  US13/768,095
• Publication Number:
  US 20130222302A1
• Time in Patent Office: 1,131 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally

Abstract

A system and method for sample rate adaption. The system and method provide for information derived from sampling at a first rate to be applied or processed at a second rate where the first and second rates differ in frequency and phase. The information is adapted from the first rate to the second rate. Then phase differences including phase introduced as by-product of adapting the frequencies are reduced by phase adaption.

Claims

1. A method for sample rate adaption comprising:

accumulating for each of a series of cycles at an output sample rate, a plurality of input samples sampled at an input sample rate that are received during a period of a screen refresh signal operated at a screen refresh rate, where the output sample rate is substantially the screen refresh rate and is less than the input sample rate, and where the series of cycles includes consecutive or non-consecutive cycles;

adapting the input sample rate to the output sample rate by replacing the input samples received during each cycle with a single representative sample; and

adapting the phase of a series of the single representative samples to the phase of the screen refresh signal by reducing phase noise in the series of the single representative samples.

2. The method for sample rate adaption of claim 1,

where the output sample rate is the screen refresh rate;

where the one or more input samples include touch panel samples; and

where the input sample rate is a touch panel sample rate.

3. The method for sample rate adaption of claim 2 where each of the input samples represents coordinates of a touch location.

4. The method for sample rate adaption of claim 1, where each of the inputs samples is a multi-dimensional sample.

5. The method for sample rate adaption of claim 1, where the single representative sample is a most recent sample of the input samples received during each cycle.

6. The method for sample rate adaption of claim 1, where the single representative sample is an average of the input samples received during each cycle.

7. The method for sample rate adaption of claim 1, where adapting the phase of a series of the single representative samples to the phase of the screen refresh signal operated at the screen refresh rate includes the use of a Kalman filter.

8. The method for sample rate adaption of claim 1, where adapting the phase of a series of the single representative samples to the phase of the screen refresh signal operated at the screen refresh rate includes the use of any of:

recursive estimation mechanisms, linear dynamic system models, and variants of a Kalman filter.

9. The method for sample rate adaption of claim 1, further comprising pre-filtering sensor noise before accumulating the one or more input samples.

10. A system for sample rate adaption, comprising:

an accumulator to accumulate for each of a series of cycles at a output sample rate, input samples sampled at an input sample rate that are received during a period of a screen refresh signal operated at a screen refresh rate, where the output sample rate is substantially the screen refresh rate and is less than the input sample rate, and where the series of cycles includes consecutive or non-consecutive cycles;

a frequency adaptor to adapt the input sample rate to the output sample rate by replacing the input samples received during each cycle with a single representative sample; and

a phase adapter to adapt the phase of a series of the single representative samples to the phase of the screen refresh signal by reducing phase noise in the series of the single representative samples.

11. The system for sample rate adaption of claim 10,

where the output sample rate is the screen refresh rate;

where the input samples include one or more touch panel samples; and

where the input sample rate is a touch panel sample rate.

12. The system for sample rate adaption of claim 11, where each of the input samples represents coordinates of a touch location.

13. The system for sample rate adaption of claim 10, where each of the inputs samples is a multi-dimensional sample.

14. The system for sample rate adaption of claim 10, where the single representative sample is a most recent sample of the input samples received during each cycle.

15. The system for sample rate adaption of claim 10, where the single representative sample is an average of the input samples received during each cycle.

16. The system for sample rate adaption of claim 10, where the phase adapter to adapt the phase of a series of the single representative samples to the phase of the screen refresh signal operated at the screen refresh rate includes a Kalman filter.

17. The system for sample rate adaption of claim 10, where the phase adapter to adapt the phase of a series of the single representative samples to the phase of the screen refresh signal operated at the screen refresh rate includes of any of:

recursive estimation mechanisms, linear dynamic system models, and variants of a Kalman filter.

18. The system for sample rate adaption of claim 10, further comprising a pre-filter to pre-filter sensor noise.