Signal statistics determination
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorWieslaw Jerzy Szajnowski
Life of this patent
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Abstract
A signal can be analysed to determine statistical characteristics indicative of, for example, the predictability or time reversibility of the signal. The signal is examined to locate events corresponding to the crossing of predetermined levels with predetermined slopes. Multiple versions of the signal are combined, the versions being shifted with respect to each other by amounts corresponding to the spacings of the detected events. The shape of the resulting representation provides statistical information regarding the signal.
Claims23
Apparatus for analysing statistical characteristics of an input signal, the apparatus comprising:
- a signal input for receiving the signal;
- an event detecting unit operatively coupled to the input for detecting events at which the signal level crosses a predetermined level with a predetermined slope;
- a combining unit for combining multiple versions of the signal, the versions comprising overlapping parts of said signal and being shifted with respect to each other by amounts corresponding to the spacing of said events, to form a representation of the signal;
- and
- a measuring unit for measuring a parameter dependent upon the shape of said representation and indicative of a statistical characteristic of said signal.
An integrated circuit including an apparatus for analysing statistical characteristics of an input signal, the apparatus comprising:
- a signal input for receiving the signal;
- an event detecting unit operatively coupled to the input for detecting events at which the signal level crosses a predetermined level with a predetermined slope;
- a combining unit for combining multiple versions of the signal, the versions being shifted with respect to each other by amounts corresponding to the spacing of said events, to form a representation of the signal;
- and
- a measuring unit for measuring a parameter dependent upon the shape of said representation and indicative of a statistical characteristic of said signal,
- wherein the integrated circuit further comprises:
- a first input terminal for receiving said input signal,
- a second input terminal for receiving a threshold signal representing said predetermined level, and
- at least one output terminal for providing an output signal forming said representation.
A method of analysing an input signal, the method comprising
- detecting events at which the signal level crosses a predetermined level with a predetermined slope,
- forming a representation of a combination of multiple versions of the signal, the versions comprising overlapping parts of said signal and being shifted with respect to each other by amounts corresponding to the spacing of the events, and
- measuring a parameter dependent upon the shape of the representation.
An apparatus for analysing statistical characteristics of an input signal, the apparatus comprising:
- a signal input for receiving the signal;
- an event detecting unit operatively coupled to the input for detecting events at which the signal level crosses a predetermined level with a predetermined slope;
- a combining unit for combining multiple versions of the signal, the versions being shifted with respect to each other by amounts corresponding to the spacing of said events, to form a representation of the signal;
- and
- a measuring unit for measuring a parameter dependent upon the shape of said representation and indicative of a statistical characteristic of said signal,
- wherein the multiple versions of the signal are time-shifted copies of the input signal,
- wherein
- the event detecting unit is operable to detect first and second types of events, and
- the multiple versions of the signal include a first and second subset, such that
- each of the first subset of multiple versions of the signal is time-shifted according to a time instance when one of the first type of events occur, and
- each of the second subset of multiple versions of the signal is time-shifted according to a time instance when one of the second type of events occurs, and
- wherein the combining unit is operable to
- average together trajectories of the first subset of multiple versions of the signal to form a first crosslation function;
- and
- average together trajectories of the second subset of multiple versions of the signal to form a second crosslation function.
Apparatus for analysing statistical characteristics of an input signal, the apparatus comprising:
- a signal input for receiving the signal;
- an event detecting unit operatively coupled to the input for detecting both first events at which the signal level crosses a predetermined level with a positive slope and second events at which the signal level crosses said predetermined level with a negative slope;
- a combining unit for combining multiple versions of the signal, the versions being shifted with respect to each other by amounts corresponding to the spacings between said first events and the spacings between said second events, to form at least one representation of the signal;
- and
- a measuring unit for measuring a parameter dependent upon the shape of said at least one representation and indicative of a statistical characteristic of said signal.
A method of analysing an input signal, the method comprising:
- detecting first events at which the signal level crosses a predetermined level with a positive slope and second events at which the signal level crosses said predetermined level with a negative slope;
- forming at least one representation of the signal by combining multiple versions of the signal, the versions being shifted with respect to each other by amounts corresponding to the spacings between said first events and the spacings between said second events;
- and
- measuring a parameter dependent upon the shape of said at least one representation.
Dependencies are inferred from the claim text.