1. A data storage device that conducts at least one of audio recording and video recording, the data storage device comprising:
a trigger signal transmitter that transmits a given trigger signal to an external device;
a storage controller that applies control to conduct the at least one of audio recording and video recording; and
a marking unit that marks stored data acquired by the at least one of audio recording and video recording at a time of transmitting the trigger signal.
2. The data storage device according to claim 1, wherein the trigger signal instructs the external device to mark stored data acquired by the external device conducting at least one of audio recording and video recording.
3. The data storage device according to claim 1,
wherein the storage controller applies control to continually conduct the at least one of audio recording and video recording, and
wherein the trigger signal transmitter transmits the trigger signal to the external device periodically or non-periodically in a case of continually conducting the at least one of audio recording and video recording.
4. The data storage device according to claim 1, further comprising:
an instruction unit by which a user arbitrarily issues instructions to acquire stored data by the at least one of audio recording and video recording,
wherein the storage controller applies control to conduct the at least one of audio recording and video recording in response to instructions from the instruction unit, and
wherein the trigger signal transmitter transmits the trigger signal when the instruction unit is operated.
5. The data storage device according to claim 4, wherein the instruction unit is one of a shutter button and an audio record button.
6. The data storage device according to claim 1, wherein the data storage device is a wearable device capable of being worn on a user.
7. The data storage device according to claim 6, wherein the external device is one of external equipment disposed near the user, and a wearable device being worn on another user.
8. The data storage device according to claim 1, wherein the data storage device is external equipment disposed near a user indoors or outdoors.
9. The data storage device according to claim 8, wherein the external device is one of other external equipment disposed near the user, and a wearable device capable of being worn on the user.
10. The data storage device according to claim 1, further comprising:
a detector that detects a specific command,
wherein the storage controller applies control to conduct the at least one of audio recording and video recording in response to the specific command detected by the detector, and
wherein the trigger signal transmitter transmits the trigger signal to the external device in a case where the detector detects the specific command.
11. The data storage device according to claim 10, wherein the detector detects the specific command based on stored data acquired by at least one of audio recording and video recording.
12. The data storage device according to claim 10, wherein the specific command is one of a command instructing audio recording or video recording, and a command indicating an emergency.
13. The data storage device according to claim 10, wherein the detector furthermore generates additional information for conducting at least one of audio recording and video recording.
14. The data storage device according to claim 13, wherein the additional information is information indicating a direction of data acquisition by the at least one of audio recording and video recording in response to the specific command.
15. The data storage device according to claim 1, wherein the marking unit marks with time information.
16. The data storage device according to claim 1, further comprising:
a data generator that generates output data based on first stored data acquired by the data storage device conducting at least one of audio recording and video recording, and second stored data which is marked in a manner that the marking corresponds to a marking of the first stored data and which is acquired by the external device conducting at least one of audio recording and video recording; and
a playback unit that plays back output data generated by the data generator.
17. A storage medium having a program stored thereon, the program causing a computer to function as:
a trigger signal transmitter that transmits a given trigger signal to an external device;
a storage controller that applies control to conduct at least one of audio recording and video recording; and
a marking unit that marks stored data acquired by the at least one of audio recording and video recording at a time of transmitting the trigger signal.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of evaluating a disc brake rotor formed as a solid of revolution about an axis having a pair of opposed spaced apart generally parallel brake friction surfaces to determine the departure of the opposed friction surfaces from spaced apart plane parallel surfaces normal to the axis, comprising:
placing a pair of sensing probes each closely adjacent a respective friction surface in opposing alignment with one another;
rotating the disc brake rotor about the axis;
providing analog measures of the instantaneous distances from probe reference points to the friction surfaces adjacent the respective probes;
repetitively sampling the instantaneous distance measures and converting the sample values to digital form
spline-based interpolating between successive distance samples to obtain a representation of equiangular spaced sample values; and
displaying the representation of the sample values.
2. The method of claim 1, wherein the step of displaying includes computing the difference between contemporaneous sample values to determine rotor thickness and displaying the result.
3. The method of claim 1, wherein the representation is numerical.
4. The method of claim 1, wherein the representation is graphical.
5. The method of claim 1, further including the steps of:
placing an additional pair of sensing probes each closely adjacent a respective friction surface in opposing alignment with one another and spaced radially inwardly from the prior placed pair;
providing analog measures of the instantaneous distances from additional probe reference points to the friction surfaces adjacent the respective additional probes;
repetitively sampling the instantaneous distance measures provided by the additional probes and converting the additional sample values to digital form; and
displaying a representation of both the sample values and additional sample values.
6. The method of claim 1, wherein the step of repetitively sampling is performed over a plurality of complete rotor revolutions to minimize the effect of rotor speed variations during a single revolution.
7. The method of claim 1 wherein the step of displaying includes performing a harmonic analysis on the sample digital forms and displaying potential harmonics in terms of undulations per revolution.
8. The method of claim 1, further including the step of providing an analog measure of the instantaneous angular rotor position, repetitively sampling the instantaneous angular position measure, correlating the angular rotor position and distance measures, and displaying a representation of the angular rotor position sample values with the corresponding distance sample values.
9. The method of claim 8, wherein the time interval between successive distance samples is constant.
10. The method of claim 9, further including the step of interpolating between successive distance samples to obtain and display a representation of equiangularly spaced sample values.
11. A method of converting a first set of chronologically equally spaced samples of dimensions taken from a rotating disc brake rotor into a second set of equiangularly spaced samples of disc brake rotor dimensions, comprising:
causing the rotor to rotate about a rotor axis a plurality of times;
identifying at least one angular reference location on the rotor;
measuring time from an initial identification of the angular reference location;
measuring variations in axial location of points on an annular surface portion of the rotor;
recording the relationship between the measured variations and the measured time;
computing the relationship between measured time and angular location relative to the angular reference, said computing includes performing a spline-based interpolation between neighboring recorded annular reference values;
inferring the relationship between measured variations and angular location relative to the angular reference; and
displaying the relationship between measured variations and angular location relative to the angular reference.
12. The method of claim 11, further including identifying additional angular reference locations equiangularly spaced about the rotor.
13. The method of claim 11, including the additional steps of:
measuring variations in axial location of points on a second annular surface portion of the rotor;
recording the relationship between the last mentioned measured variations and the measured time;
inferring the relationship between the last mentioned measured variations and angular location relative to the angular reference;
filtering the measured variations with a spline-based filter; and
displaying the relationship between the last mentioned measured variations and angular location relative to the angular reference.
14. The method of claim 11, including the additional steps of:
measuring variations in axial location of points on a second annular surface portion of the rotor;
recording the relationship between the last mentioned measured variations and the measured time;
inferring the relationship between the last mentioned measured variations and angular location relative to the angular reference;
filtering the measured variations with a robust spline-based filter; and
displaying the relationship between the last mentioned measured variations and angular location relative to the angular reference.
15. The method of claim 14, wherein the annular surface and second annular surface are generally coplanar and radially separated from one another.
16. The method of claim 14, wherein the annular surface and second annular surface are located on opposite rotor sides at the same radial distance from the rotor axis and including the additional step of computing rotor thickness variations as a function of angular location.
17. A method of monitoring deviations of a disc brake rotor from a theoretical surface of revolution, comprising:
causing the rotor to rotate about a rotor axis;
identifying at least one angular reference location on the rotor;
measuring variations in axial location of points on a first annular surface portion on a first side of the rotor and a second annular surface portion on a second side of the rotor opposite said first side, said first and second annular surface portions being located at a same radial distance from the rotor axis;
computing rotor thickness variations as a function of angular location;
converting the measured variations to digital forms;
performing a spline-based interpolation on the digital forms;
recording the converted and interpolated measured variations as a function of angular location relative to the first angular reference; and
displaying the converted and interpolated measured variations as a function of angular location relative to the first angular reference.
18. The method of claim 17, including the additional steps of:
measuring variations in axial location of points on said second annular surface portion of the rotor;
recording the last mentioned measured variations as a function of angular location relative to the first angular reference; and
displaying the last mentioned measured variations as a function of angular location relative to the first angular reference.
19. The method of claim 17 wherein the first annular surface and second annular surface are generally coplanar and radially separated from one another.
20. The method of claim 17, wherein the step of measuring variations is repeated over a plurality of rotor revolutions to effectively eliminate any effects of speed variation within a single revolution.
21. The method of claim 17, wherein the step of displaying includes performing a harmonic analysis on the sample digital forms and displaying harmonics in terms of undulations per revolution.
22. The method of claim 17, wherein the step of recording the measured variations as a function of angular location relative to the angular reference includes:
identifying at least one angular reference location on the rotor;
measuring time from an initial identification of the first angular reference location;
recording the relationship between the measured variations and the measured time;
computing the relationship between measured time and angular location relative to the first angular reference; and
inferring the relationship between measured variations and angular location relative to the first angular reference.