Generating haptic effects while minimizing cascading
A system that generates haptic effects using an actuator receives a haptic effect definition that defines a haptic effect. The system pre-processes the haptic effect definition by determining if the actuator is capable of playing the haptic effect. The system then post-processes the haptic effect definition by adjusting a force value based on an estimate or measurement of a state of the actuator during a playing of the haptic effect.
1. A computer-readable medium having instructions stored thereon that, when executed by a processor, cause the processor to generate haptic effects using an actuator, the generating comprising:
receiving a haptic effect definition that defines a haptic effect;
pre-processing the haptic effect definition comprising determining if the actuator is capable of playing the haptic effect, the determining comprising characterizing a rise time of the actuator and a fall time of the actuator; and
post-processing the haptic effect definition comprising adjusting a force value based on an estimate or measurement of a state of the actuator, wherein the adjusting occurs during a playing of the haptic effect.
2. The computer-readable medium of claim 1 , wherein the estimate of the state of the actuator is based on estimating where the actuator lies on a rise time curve or a fall time curve.
3. The computer-readable medium of claim 1 , wherein the haptic effect definition comprises a parameterized vibration definition that defines an envelope of the haptic effect.
4. The computer-readable medium of claim 3 , wherein the parameterized vibration definition comprises one or more parameters comprising at least one of duration, frequency or magnitude.
5. The computer-readable medium of claim 1 , wherein the actuator comprises an Eccentric Rotating Mass.
6. The computer-readable medium of claim 1 , wherein the pre-processing comprises scaling down the haptic effect.
7. The computer-readable medium of claim 1 , wherein the post-processing is executed each time before a force value is sent to a drive circuit for an actuator.
8. The computer-readable medium of claim 1 , wherein the post-processing occurs at pre-determined time intervals as the haptic effect is played.
9. The computer-readable medium of claim 8 , wherein the haptic effect is played by sending the haptic effect to the actuator.
10. A method of generating haptic effects using an actuator, the method comprising:
receiving a haptic effect definition that defines a haptic effect;
pre-processing the haptic effect definition comprising determining if the actuator is capable of playing the haptic effect, the determining comprising characterizing a rise time of the actuator and a fall time of the actuator; and
post-processing the haptic effect definition comprising adjusting a force value based on an estimate or measurement of a state of the actuator, wherein the adjusting occurs during a playing of the haptic effect.
11. The method of claim 10 , wherein the estimate of the state of the actuator is based on estimating where the actuator lies on a rise time curve or a fall time curve.
12. The method of claim 10 , wherein the haptic effect definition comprises a parameterized vibration definition that defines an envelope of the haptic effect.
13. The method of claim 12 , wherein the parameterized vibration definition comprises one or more parameters comprising at least one of duration, frequency or magnitude.
14. The method of claim 10 , wherein the actuator comprises an Eccentric Rotating Mass.
15. The method of claim 10 , wherein the pre-processing comprises scaling down the haptic effect.
16. The method of claim 10 , wherein the post-processing is executed each time before a force value is sent to a drive circuit for an actuator.
17. The method of claim 10 , wherein the post-processing occurs at pre-determined time intervals as the haptic effect is played.
18. The method of claim 17 , wherein the haptic effect is played by sending the haptic effect to the actuator.
19. A haptically enabled system comprising:
a controller that receives a haptic effect definition that defines a haptic effect;
a drive circuit coupled to the controller;
an actuator coupled to the drive circuit;
a pre-processor coupled to the drive circuit that pre-processes the haptic effect definition comprising determining if the actuator is capable of playing the haptic effect, the determining comprising characterizing a rise time of the actuator and a fall time of the actuator; and
a post-processor coupled to the drive circuit that post-processes the haptic effect definition comprising adjusting a force value based on an estimate or measurement of a state of the actuator, wherein the adjusting occurs during a playing of the haptic effect.
20. The system of claim 19 , wherein the estimate of the state of the actuator is based on estimating where the actuator lies on a rise time curve or a fall time curve.
21. The system of claim 19 , wherein the haptic effect definition comprises a parameterized vibration definition that defines an envelope of the haptic effect.
22. The system of claim 21 , wherein the parameterized vibration definition comprises one or more parameters comprising at least one of duration, frequency or magnitude.
23. The system of claim 19 , wherein the actuator comprises an Eccentric Rotating Mass.
24. The system of claim 19 , wherein the pre-processing comprises scaling down the haptic effect.
25. The system of claim 19 , wherein the post-processing is executed each time before a force value is sent to the drive circuit.
26. The system of claim 19 , wherein the post-processing occurs at pre-determined time intervals as the haptic effect is played.
27. The system of claim 26 , wherein the haptic effect is played by sending the haptic effect to the actuator.