Method and device for varying interpolation factors
AssigneeRenco Encoders, Inc.
InventorsRobert Setbacken, Mark Mazgaj
Life of this patent
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Abstract
A method and device for varying interpolation factor of at least one position-dependent, periodic signal in a position measurement system. The method and device allows switching between one of a specified number of different interpolation factors at a switching time point at which the interpolated measurement signal has an identical signal form for every possible interpolation factor.
Claims33
A method for varying an interpolation factor of at least one position-dependent, periodic signal in a position measurement system, the method comprising the steps of:
- transmitting an activation signal from an input interface to a processing unit wherein the activation signal initiates a change of the active interpolation factor to a new interpolation factor;
- transmitting a control signal from the processing unit to an evaluation unit wherein the control signal indicates that the active interpolation factor will be changed;
- and
- switching between the active interpolation factor and the new interpolation factor at a switching time point t.sub.u at which an interpolated measurement signal has an identical signal form for every possible interpolation factor.
A device for varying the interpolation factor of a least one position-dependent periodic signal which is supplied by a signal creation unit of a position measurement system, wherein the signal is further processed in a processing unit, and is routed to a downstream evaluation unit, the device comprising:
- at least one input interface, which is connected to the processing unit through one or several connection lines and through which an activation signal can be transmitted in the direction of the processing unit wherein the activation signal initiates a change of the active interpolation factor to a new interpolation factor;
- and
- at least one connection between the evaluation unit and the processing unit through which at least one control signal can be transmitted in the direction of the evaluation unit, which indicates that the actual interpolation factor will be changed.
A method for varying an interpolation factor of at least one position-dependent, periodic signal in a position measurement system, the method comprising the steps of:
- transmitting an activation signal from an input interface to a processing unit wherein the activation signal initiates a change of the active interpolation factor to a new interpolation factor;
- transmitting a control signal from the processing unit to an evaluation unit wherein the control signal indicates that the active interpolation factor will be changed;
- and
- switching between the active interpolation factor and the new interpolation factor at a switching time point t.sub.u at which an interpolated measurement signal has an identical signal form for every possible interpolation factor, wherein the periodic interpolated signal has a rising signal edge at switching time point t.sub.u.
A method for varying an interpolation factor of at least one position-dependent, periodic signal in a position measurement system, the method comprising the steps of:
- transmitting an activation signal from an input interface to a processing unit wherein the activation signal initiates a change of the active interpolation factor to a new interpolation factor;
- transmitting a control signal from the processing unit to an evaluation unit wherein the control signal indicates that the active interpolation factor will be changed;
- and
- switching between the active interpolation factor and the new interpolation factor at a switching time point t.sub.u at which an interpolated measurement signal has an identical signal form for every possible interpolation factor, defining a stabilization interval of defined duration t.sub.H before and after the switching time point t.sub.u of every signal period, during which no change is possible in the interpolation factor.
A method for varying an interpolation factor of at least one position-dependent, periodic signal in a position measurement system, the method comprising the steps of:
- transmitting an activation signal from an input interface to a processing unit wherein the activation signal initiates a change of the active interpolation factor to a new interpolation factor;
- transmitting a control signal from the processing unit to an evaluation unit wherein the control signal indicates that the active interpolation factor will be changed;
- and
- switching between the active interpolation factor and the new interpolation factor at a switching time point t.sub.u at which an interpolated measurement signal has an identical signal form for every possible interpolation factor, defining a stabilization interval of defined duration before and after the switching point t.sub.u of every signal period during which no change is possible in the interpolation factor wherein the stabilization interval is equal to a phase angle 90.degree. of the period signal and is centered around a switching time point t.sub.u which is selected by a rising edge of the interpolated signal wherein it is possible to switch between the specified number of interpolation factors.
A method for varying an interpolation factor of at least one position-dependent, periodic signal in a position measurement system, the method comprising the steps of:
- transmitting an activation signal from an input interface to a processing unit wherein the activation signal initiates a change of the active interpolation factor to a new interpolation factor;
- transmitting a control signal from the processing unit to an evaluation unit wherein the control signal indicates that the active interpolation factor will be changed;
- and
- switching between the active interpolation factor and the new interpolation factor at a switching time point t.sub.u at which an interpolated measurement signal has an identical signal form for every possible interpolation factor, wherein switching between various interpolation factors is initiated by at least one activation signal from a user.
A method for varying an interpolation factor of at least one position-dependent, periodic signal in a position measurement system, the method comprising the steps of:
- transmitting an activation signal from an input interface to a processing unit wherein the activation signal initiates a change of the active interpolation factor to a new interpolation factor;
- transmitting a control signal from the processing unit to an evaluation unit wherein the control signal indicates that the active interpolation factor will be changed;
- switching between the active interpolation factor and the new interpolation factor at a switching time point t.sub.u at which an interpolated measurement signal has an identical signal form for every possible interpolation factor, in which the step of switching between the active interpolation factor and the new interpolation factor at a switching time point t.sub.u comprises the steps of:
- providing a stabilization interval which is limited in time in every signal period and is centered around the possible switching time point t.sub.u ;
- initiating a change of the active interpolation factor to anew interpolation factor by an activation signal;
- activating a switching interval signal H simultaneously with the activation signal;
- using the new interpolation factor from the next possible switching time point t.sub.u ;
- and
- deactivating the switching interval signal after a switching has taken place to the new interpolation factor.
A device for varying the interpolation factor of at least one position-dependent periodic signal which is supplied by a signal creation unit of a position measurement system, wherein the signal is further processed in a processing unit, and is routed to a downstream evaluation unit, the device comprising:
- at least one input interface, which is connected to the processing unit through one or several connection lines and through which an activation signal can be transmitted in the direction of the processing unit wherein the activation signal initiates a change of the active interpolation factor to a new interpolation factor;
- and
- at least one connection between the evaluation unit and the processing unit through which at least one control signal can be transmitted in the direction of the evaluation unit, which indicates that the actual interpolation factor will be changed, wherein the at least one control signal is a switching interval signal that indicates a time span t.sub.H between the initiation of a switch and a switching time point t.sub.u.
Dependencies are inferred from the claim text.