06342880 is referenced by 96 patents and cites 7 patents.

A force feedback interface including a haptic accelerator that relieves the computational burden associated with force feedback generation from a force feedback processor. The force feedback processor is preferably a device microprocessor included in the interface device and separate from a controlling host computer for determining forces to be output. The haptic accelerator quickly determines velocity and/or acceleration information describing motion of a user manipulatable object from raw position data received from sensors of the interface device and representing the position of the user object. The velocity and/or acceleration data is used by the force feedback processor in the determination of forces to be output on the user object. The haptic accelerator can in some embodiments also quickly and reliably determine condition forces which depend on the motion of the user object, thus relieving additional computation burden from the force feedback processor and permitting the force feedback processor to focus on determining other types of forces and overseeing the operation of the force feedback interface device.

Title
Force feedback system including multiple force processors
Application Number
9/414294
Publication Number
6342880 (B2)
Application Date
October 6, 1999
Publication Date
January 29, 2002
Inventor
Mike D Levin
Sunnyvale
CA, US
Bruce M Schena
Menlo Park
CA, US
Christopher J Hasser
Newark
CA, US
Louis B Rosenberg
Pleasanton
CA, US
Agent
James R Riegel
US
Assignee
Immersion Corporation
CA, US
IPC
G09G 5/08
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