Method and apparatus for recording sensor data

• US 5,646,994 A
• Filed: 03/04/1996
• Issued: 07/08/1997
• Est. Priority Date: 04/19/1994
• Status: Expired due to Term

• Current Assignee: Safety Vision Limited Liability Company
• Original Assignee: Prime Facie Incorporated
• Inventors: Hill, Brian R.
• Primary Examiner(s): CANGIALOSI, SALVATORE A
• Application Number:
  US08/606,493
• Time in Patent Office: 491 Days
• Field of Search: 380/9, 380/25, 380/30, 380/49, 348/144, 348/148
• US Class Current: 380/200
• CPC Class Codes: G01P 1/16 for erasable recording, e.g. magnetic recording
• CPC Class Codes: G07C 5/085 using electronic data carriers
• CPC Class Codes: G07C 5/0858 wherein the data carrier is removable
• CPC Class Codes: G07C 5/0891 Video recorder in combination with video camera
• CPC Class Codes: G11B 20/00007 Time or data compression or expansion audio compression based on psychoacoustics G10L19/00; data processing for reproducing audio data at different playback speeds G10L21/04; video compression H04N19/00; data compression per se H03M7/30
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: H04L 2209/30 Compression, e.g. Merkle-Damgard construction
• CPC Class Codes: H04L 2209/805 Lightweight hardware, e.g. radio-frequency identification [RFID] or sensor
• CPC Class Codes: H04L 2209/84 Vehicles
• CPC Class Codes: H04L 9/00 Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
• CPC Class Codes: H04N 19/00 Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
• CPC Class Codes: H04N 5/781 on disks or drums
• CPC Class Codes: H04N 5/782 on tape
• CPC Class Codes: H04N 5/907 using static stores, e.g. storage tubes or semiconductor memories H04N5/91 takes precedence
• CPC Class Codes: H04N 7/18 Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
• CPC Class Codes: H04N 9/8042 involving data reduction
• CPC Class Codes: H04N 9/8205 involving the multiplexing of an additional signal and the colour video signal
• CPC Class Codes: H04N 9/8227 the additional signal being at least another television signal

Abstract

A method and apparatus for recording sensor data. The analog and digital signals containing the sensor data are accompanied by a concurrent analog video signal. The analog signals are converted to digital form and highly redundant signals are compressed according to conventional compression techniques. The resulting compressed and uncompressed signals are encrypted and stored on a removable hard disk. The data stored on the removable hard disk can later be played back to reconstruct the original signals while assuring that the played back signals are correct reconstructions of the original signals.

Claims

1. A method for retrieving sensor data originally produced by one or more sensors, the sensor data being encrypted with a video signal to produce a recorded signal that protects the sensor data and being contained in signals from one or more sensors, the method comprising the steps of:

a) playing back the recorded signal to produce a played-back signal;

b) decrypting the played-back signal to produce a video signals and one or more sensor signals containing data originally produced by one or more sensors;

c) determining whether any of the one or more sensor signals are digital signals; and

d) processing the one or more sensor signals to produce the sensor data.

2. The method of claim 1, wherein at least one of the sensor signals is a digital signal that has been encrypted with a digital encryption procedure.

3. The method of claim 2, wherein the digital encryption procedure is a public key encryption procedure.

4. The method of claim 3, wherein step d) includes decompressing any digital sensor signals.

5. The method of claim 4, wherein the video signal is modulated with a carrier signal and with an encrypted sensor signal.

6. A method for recording sensor data with a video signal to protect the sensor data, the sensor data being contained in signals from one or more sensors, the method comprising the steps of:

a) determining which of the signals from the one or more sensors are analog sensor signals and which of the signals from the one or more sensors are digital sensor signals;

b) converting the data in the analog sensor signals to one or more first digital signals;

c) encrypting the digital sensor signals and the one or more first digital signals to produce second digital signals;

d) converting the second digital signals to first analog signals; and

e) recording the video signal and the first analog signals on a recording medium.

7. The method of claim 6, wherein step c) comprises:

c1) encrypting the digital sensor signals in accordance with a digital encryption procedure.

8. The method of claim 7, wherein step c1) includes encrypting the digital signals in accordance with a public key encryption procedure.

9. The method of claim 7, wherein step d) comprises:

d1) compressing the second digital signals in accordance with a digital compression procedure.

10. The method of claim 7, wherein step e) includes mixing the video signal and the first analog signal.

11. The method of claim 7, wherein step e) includes modulating a carrier signal with the video signal and with the first analog signal.

12. A method for retrieving sensor data originally produced by one or more sensors, the sensor data being encrypted with a video signal to produce a recorded signal that protects the sensor data and being contained in signals from one or more sensors, at least one of the sensors producing an analog signal, the method comprising the steps of:

a) playing back the recorded signals to produce a played-back signal;

b) decrypting the played-back signal to produce a video signals and one or more sensor signals containing data originally produced by one or more sensors;

c) determining whether any of the one or more sensor signals are digital signals; and

d) processing the one or more sensor signals to produce the sensor data, including converting the one or more sensor signals to produce a corresponding analog signal.

13. The method of claim 12, wherein at least one of the sensor signals is a digital signal that has been encrypted with a digital encryption procedure, and step d) including decrypting the digital signal according to the digital encryption procedure.

14. The method of claim 13, wherein the digital encryption procedure is a public key encryption procedure.

15. The method of claim 14, wherein step d) includes decompressing any digital sensor signals.

16. The method of claim 15, wherein the video signal is modulated with a carrier signal and with an encrypted sensor signal.

17. Apparatus for retrieving sensor data originally produced by one or more sensors, the sensor data being encrypted with a video signal to produce a recorded signal that protects the sensor data and being contained in signals from one or more sensors, the method comprising the steps of:

a play-back circuit to play back the recorded signal to produce a played-back signal;

a decryption circuit to decrypt the played-back signal to produce a video signal and one or more sensor signals containing data originally produced by one or more sensors; and

a signal processing circuit to process the one or more sensor signals to produce the sensor data.

18. The apparatus of claim 17, wherein at least one of the sensor signals is a digital signal that has been encrypted with a digital encryption procedure.

19. The apparatus of claim 17, wherein the digital encryption procedure is a public key encryption procedure.

20. The method of claim 17, wherein the sensor signals and the video signal are mixed.

21. The method of claim 20, wherein the video signal is modulated with a carrier signal and with an encrypted sensor signals.

22. Apparatus for retrieving sensor data originally produced by one or more sensors, the sensor data being encrypted with a video signal to produce a recorded signal that protects the sensor data and being contained in signals from one or more sensors, the apparatus comprising:

a play-back circuit to play back the recorded signal to produce a played-back signal;

a decryption circuit to decrypt the played-back signal to produce a video signals and one or more sensor signals containing data originally produced by one or more sensors;

a logic circuit to determine whether any of the one or more sensor signals are digital signals; and

a signal processing circuit to process the one or more sensor signals to produce the sensor data.

23. The apparatus of claim 22, wherein at least one of the sensor signals is a digital signal that has been encrypted with a digital encryption procedure.

24. The apparatus of claim 23, wherein the digital encryption procedure is a public key encryption procedure.

25. The method of claim 23, wherein the signals processing circuit includes a decompression circuit to decompress any digital sensor signals.

26. The apparatus of claim 25, wherein the video signal is modulated with a carrier signal and with an encrypted sensor signal.

27. Apparatus for retrieving sensor data originally produced by one or more sensors, the sensor data being encrypted with a video signal to produce a recorded signal that protects the sensor data and being contained in signals from one or more sensors, at least one of the sensors producing an analog signal, the apparatus comprising:

a play-back circuit to play back the recorded signal to produce a played-back signal;

a decryption circuit to decrypt the played-back signal to produce a video signal and one or more sensor signals containing data originally produced by one or more sensors;

a logic circuit to determine whether any of the on sensor signals are digital signals; and

a signal processing circuit to process the one or more sensor signals to produce the sensor data, including converting the one or more sensor signals to produce a corresponding analog signal.

28. The apparatus of claim 27, wherein at least one of the sensor signals is a digital signal that has been encrypted with a digital encryption procedure, and the signal processing circuit includes a decryption circuit to decrypt the digital signal accordion to the digital encryption procedure.

29. The apparatus of claim 28, wherein the digital encryption procedure is a public key encryption procedure.

30. The apparatus of claim 29, wherein the decryption circuit decompresses any digital sensor signals.

31. The apparatus of claim 30, wherein the video signal is modulated with a carrier signal and with an encrypted sensor signal.