초록 ▼

A communication subscriber which, as a passive subscriber of a communication system, does not have its own transmission authorization but listens to all the communication processes and can receive only those data items which are also intended for it, which can be identified without doubt from destin

A communication subscriber which, as a passive subscriber of a communication system, does not have its own transmission authorization but listens to all the communication processes and can receive only those data items which are also intended for it, which can be identified without doubt from destination identifier allocated to the data items, is given the capability, according to the invention, also to receive in addition those data items whose destination identifier and source identifier match an entry in a filter table provided in the communication subscriber which has been given the capability according to the invention.

대표청구항 ▼

A communication subscriber which, as a passive subscriber of a communication system, does not have its own transmission authorization but listens to all the communication processes and can receive only those data items which are also intended for it, which can be identified without doubt from destin

A communication subscriber which, as a passive subscriber of a communication system, does not have its own transmission authorization but listens to all the communication processes and can receive only those data items which are also intended for it, which can be identified without doubt from destination identifier allocated to the data items, is given the capability, according to the invention, also to receive in addition those data items whose destination identifier and source identifier match an entry in a filter table provided in the communication subscriber which has been given the capability according to the invention. single point. 22. The system of claim 20 wherein the generator comprises three orthogonally disposed magnetic dipoles. 23. The system of claim 1 wherein the electromagnetic unit further includes a third member communicating with the first and second members by electromagnetic radiation and fixable relative to the operating environment. 24. A system for monitoring a position of a medical instrument with respect to a patient's body, comprising: a medical instrument; a reference mount attachable to the patient's body in a repeatable fashion for movement with the patient's body; and an electromagnetic unit for association with the reference mount and the medical instrument for monitoring movement of the medical instrument relative to the reference mount, the electromagnetic unit including a first member attachable to the patient's body and a second member attachable to the medical instrument, the first and second members communicating by electromagnetic radiation that is not blocked by the body. 25. The system of claim 24 wherein the first member is attachable to the patient's body by the reference mount. 26. The system of claim 24 wherein the electromagnetic unit is configured to permit easy surgical access. 27. The system of claim 24 wherein the reference mount comprises a headset. 28. The system of claim 27 wherein the headset is configured for attachment to the patient's head at at least three points of contact. 29. The system of claim 27 wherein the headset is configured for use during scanning and surgery to provide registration with a computer image during surgery. 30. The system of claim 27 further comprising markers coupled to the headset for providing reference points on computer images of the head. 31. The system of claim 27 wherein the headset comprises a frame including a nose mount, and first and second ear mounts. 32. The system of claim 24 wherein the reference mount is configured for use during scanning and surgery to provide registration with a computer image during surgery. 33. The system of claim 24 wherein the medical instrument comprises an aspirator. 34. The system of claim 33 wherein the aspirator defines an instrument mount for receiving the second member. 35. The system of claim 24 wherein the medical instrument comprises a flexible medical instrument. 36. The system of claim 35 wherein the second member is mounted at a distal region of the medical instrument. 37. The system of claim 24 further comprising a position detection unit for producing position data responsive to an output signal from the second member. 38. The system of claim 37 further comprising an image storage unit including image data representing a plurality of images of the patient's body. 39. The system of claim 38 further comprising a registration unit for relating the position data and the image data to select an image of the patient's body. 40. The system of claim 39 further comprising a display for displaying the image of the patient's body. 41. The system of claim 24 wherein the first member comprises an electromagnetic generator, and the second member comprises an electromagnetic receiver. 42. The system of claim 41 wherein the generator produces a field that emanates from substantially a single point. 43. The system of claim 41 wherein the generator comprises three orthogonally disposed magnetic dipoles. 44. The system of claim 24 wherein the electromagnetic unit further includes a third member communicating with the first and second members by electromagnetic radiation and fixable relative to the operating environment. 45. A system for monitoring a position of a medical instrument with respect to a patient's body, comprising: a medical instrument; a reference mount attachable to the patient's body for movement with the patient's body; and an electromagnetic unit for association with the reference mount and the medical instrument for monitoring movement of the medical instrument relative to the reference mount, the ele