Method of and system for mobile surveillance and event recording
A data-encoding system includes a source of unencoded data, and a first encoder interoperably coupled to the source, wherein the first encoder is adapted to receive the unencoded data, encode the unencoded data, and output encoded data at a first data rate. The data encoding system further includes a second encoder interoperably coupled to the source, wherein the second encoder is adapted to receive the unencoded data, encode the unencoded data, and output encoded data at a second data rate in which the second data rate exceeds the first data rate. This Abstract is provided to comply with rules requiring an Abstract that allows a searcher or other reader to quickly ascertain subject matter of the technical disclosure. This Abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).
1. A method of archiving data, the method comprising:
receiving data;
storing the data on a first data storage medium;
determining that a record trigger is active;
responsive to the record trigger, selecting a portion of the data for storage on a second data storage medium;
determining if at least one environmental factor exceeds a tolerable limit of the second data storage medium;
responsive to a determination that the at least one environmental factor does not exceed the tolerable limit of the second data storage medium, storing the selected portion of the data on the second data storage medium; and
responsive to a determination that the at least one environmental factor exceeds the tolerable limit of the second data storage medium:
delaying storing the selected portion of the data on the second data storage medium for a period of time;
determining, after the period of time, that the at least one environmental factor does not exceed the tolerable limit of the second data storage medium; and
responsive to the determining that the at least one environmental factor does not exceed the tolerable limit of the second data storage medium, storing the selected portion of the data on the second data storage medium.
2. The method of claim 1 , wherein the at least one environmental factor comprises at least one of temperature, physical shock, and vibration.
3. The method of claim 1 , wherein the determining if at least one environmental factor exceeds the tolerable limit of the second data storage medium comprises:
measuring the at least one environmental factor; and
determining if the at least one environmental factor is less than a predetermined threshold.
4. The method of claim 1 , wherein the step of storing the selected portion of the data on the second data storage medium further comprises:
writing the selected portion of the data on the second data storage medium;
monitoring at least one accelerometer during the storing of the selected portion of the data;
determining if an output value of the at least one accelerometer exceeds a predetermined accelerometer threshold; and
responsive to a determination that the output value of the at least one accelerometer exceeds the predetermined accelerometer threshold, rewriting the selected portion of the data on the second data storage medium.
5. The method of claim 4 , further comprising: responsive to a determination that the output value of the at least one accelerometer does not exceed the predetermined accelerometer threshold, returning to the selecting step.
6. The method of claim 1 , wherein the step of storing the selected portion of the data on the second data storage medium further comprises:
writing the selected portion of the data on the second data storage medium;
calculating a first checksum corresponding to the selected portion of the data;
reading the selected written portion of the data from the second data storage medium;
calculating a second checksum corresponding the selected written portion of the data read from the second data storage medium;
determining if the first checksum matches the second checksum; and
responsive to a determination that the first checksum does no match the second checksum, rewriting the selected portion of the data on the second data storage medium.
7. The method of claim 6 , further comprising: responsive to a determination that the first checksum matches the second checksum, returning to the selecting step.
8. The method of claim 1 , wherein the data comprises encoded data.
9. The method of claim 8 , wherein the encoded data comprises at least one of video data, audio data, and metadata.
10. The method of claim 1 , wherein the first data storage medium comprises a non-removable storage medium.
11. The method of claim 1 , wherein the second data storage medium comprises a removable storage medium.
12. A computer system for archiving data, the computer system comprising:
a processor; and
a memory including software instructions adapted to enable the computer system to perform the steps of:
receiving data;
storing the data on a first data storage medium;
determining that a record trigger is active;
responsive to the record trigger, selecting a portion of the data for storage on a second data storage medium;
determining if at least one environmental factor exceeds a tolerable limit of the second data storage medium;
responsive to a determination that the at least one environmental factor does not exceed the tolerable limit of the second data storage medium, storing the selected portion of the data on the second data storage medium; and
responsive to a determination that the at least one environmental factor exceeds the tolerable limit of the second data storage medium:
delaying storing the selected portion of the data on the second data storage medium for a period of time;
determining, after the period of time, that the at least one environmental factor does not exceed the tolerable limit of the second data storage medium; and
responsive to the determining that the at least one environmental factor does not exceed the tolerable limit of the second data storage medium, storing the selected portion of the data on the second data storage medium.
13. The computer system of claim 12 , wherein the at least one environmental factor comprises at least one of temperature, physical shock, and vibration.
14. The computer system of claim 12 , wherein the determining if at least one environmental factor exceeds the tolerable limit of the second data storage medium comprises:
measuring the at least one environmental factor; and
determining if the at least one environmental factor is less than a predetermined threshold.
15. The computer system of claim 12 , wherein the step of storing the selected portion of the data on the second data storage medium further comprises:
writing the selected portion of the data on the second data storage medium;
monitoring at least one accelerometer during the storing of the selected portion of the data;
determining if an output value of the at least one accelerometer exceeds a predetermined accelerometer threshold; and
responsive to a determination that the output value of the at least one accelerometer exceeds the predetermined accelerometer threshold, rewriting the selected portion of the data on the second data storage medium.
16. The computer system of claim 15 , further comprising software instructions adapted to enable the computer system to perform the step of, responsive to a determination that the output value of the at least one accelerometer does not exceed the predetermined accelerometer threshold, returning to the selecting step.
17. The computer system of claim 12 , wherein the step of storing the selected portion of the data on the second data storage medium further comprises:
writing the selected portion of the data on the second data storage medium; calculating a first checksum corresponding to the selected portion of the data;
reading the selected written portion of the data from the second data storage medium; calculating a second checksum corresponding the selected written portion of the data read from the second data storage medium;
determining if the first checksum matches the second checksum; and
responsive to a determination that the first checksum does no match the second checksum, rewriting the selected portion of the data on the second data storage medium.
18. The computer system of claim 17 , further comprising software instructions adapted to enable the computer system to perform the step of, responsive to a determination that the first checksum matches the second checksum, returning to the selecting step.
19. The computer system of claim 12 , wherein the data comprises encoded data.
20. The computer system of claim 19 , wherein the encoded data comprises at least one of video data, audio data, and metadata.
21. The computer system of claim 12 , wherein the first data storage medium comprises a non-removable storage medium.
22. The computer system of claim 12 , wherein the second data storage medium comprises a removable storage medium.