LATENCY MEASUREMENT

• US 20130197862A1
• Filed: 01/31/2012
• Published: 08/01/2013
• Est. Priority Date: 01/31/2012
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Uzelac, Aleksandar, Stevens, David A., Batchvarov, Andrey B., Shigemitsu, Takahiro, Lee, Changsin
• Granted Patent: US 8,914,254 B2
• Time in Patent Office: Days
• US Class Current: 702/186
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment

Abstract

Panning latency measurement techniques are described. In one or more implementations, a test apparatus includes one or more motors configured to move one or more contacts at least proximal to one or more sensors of a device to be detectable as a movement. The test apparatus also includes one or more modules implemented at least partially in hardware to measure latency of the device to recognize the movement of the one or more contacts.

Claims

1. A test apparatus comprising:

one or more motors configured to move one or more contacts at least proximal to one or more sensors of a device to be detectable as movement; and

one or more modules implemented at least partially in hardware to measure latency of the device to recognize the movement of the one or more contacts.

2. A test apparatus as described in claim 1, wherein the one or more modules are configured to measure the latency as hardware latency of the device in recognizing the movement.

3. A test apparatus as described in claim 1, wherein the one or more modules are configured to measure the latency as end-to-end latency of the device in recognizing the movement.

4. A test apparatus as described in claim 1, wherein the one or more motors are configured as a step motor.

5. A test apparatus as described in claim 4, wherein the step motor is configured to move the one or more contacts to form a circular path, at least a portion of which is detectable by the one or more sensors of the device.

6. A test apparatus as described in claim 1, wherein the one or more modules are configured to measure the latency of the device in recognizing the movement through use of constant angular velocity.

7. A test apparatus as described in claim 1, wherein the one or more sensors of the device are configured to detect the one or more contacts as at least proximal through configuration as a touch sensor, infrared sensor, optical imaging sensor, dispersive signal sensor, sensor in pixel, resistive sensor, or acoustic pulse recognition sensor.

8. A test apparatus as described in claim 1, wherein the one or more modules include an interruption module having a photo interrupter circuit configured to detect position of the one or more contacts, which is used at least in part to measure the latency.

9. A test apparatus as described in claim 8, wherein the interruption module is configured to detect when the one or more contacts passes a control point to determine an angle of rotation for the contact by the one or more motors.

10. A test apparatus as described in claim 1, further comprising a laser and a photo diode that is configured to detect when the one or more contacts passes between the laser and the photo diode, which is used at least in part to measure the latency.

11. A method comprising:

receiving data by a test apparatus that describes panning movement detected using touch functionality of a device; and

measuring latency, by the test apparatus, of the device to recognize the panning movement to initiate one or more operations of the device.

12. A method as described in claim 11, wherein the one or more operations cause a user interface output by the device to pan in a direction and magnitude that corresponds to the detected panning movement.

13. A method as described in claim 11, wherein the latency is hardware latency of the device.

14. A method as described in claim 11, wherein the panning movement detected by the touch functionality of the device is caused through movement of a contact at least proximal to the touch functionality of the device.

15. A method as described in claim 14, wherein the contact is moved by the test apparatus using a step motor.

16. A method as described in claim 11, wherein the measuring is performed at least in part through use of constant angular velocity.

17. A method as described in claim 11, further comprising receiving one or more signals from a photo interrupter circuit configured to detect the contact and the measuring uses the one or more signals to measure the latency.

18. A method as described in claim 11, further comprising receiving a signal from a photo diode that is configured to detect when the contact passes between a laser and the photo diode, which is to be used at least in part to measure the latency.

19. A test apparatus comprising:

a contact configured to be disposed proximal to a display device having touchscreen functionality;

a motor configured to move the contact in a circular path to be detectable by the touchscreen functionality of the device as a panning movement; and

one or more modules implemented at least partially in hardware to measure latency of the device to recognize the panning movement of the contact using constant angular velocity.

20. A test apparatus as described in claim 19, wherein the one or more modules include an interruption module having a photo interrupter circuit configured to detect the contact, which is used at least in part to measure the latency.