Surveillance system for transmitting images via a radio transmitter

• US 5,406,324 A
• Filed: 10/30/1992
• Issued: 04/11/1995
• Est. Priority Date: 10/30/1992
• Status: Expired due to Fees

• Current Assignee: Alexander Roth
• Original Assignee: Alexander Roth
• Inventors: Roth, Alexander
• Primary Examiner(s): Britton, Howard W.
• Application Number:
  US07/969,101
• Time in Patent Office: 893 Days
• Field of Search: 358/108, 358/469, 379/53, 348/24, 348/22, 348/143, 348/148
• US Class Current: 348/22
• CPC Class Codes: H04N 7/185 from a mobile camera, e.g. for remote control

Abstract

An image transmission surveillance system using a radio having a remote transmitter and a base receiver provides a camera for converting visual images into an electrical signal. The electrical signal is converted by an audio module into an audio signal for transmission by the radio. A computer connected with the base receiver converts audio signals received from the audio module into image data. This data is stored in a data storage device of the computer for later review on a monitor or similar image viewing device. The audio signal can be converted into audible sound for receipt by the radio microphone.

Claims

1. An image transmission surveillance system using a radio having a remote transmitter and a base receiver comprising:

a camera for converting visual images into an electrical signal;

an audio module for converting the electrical signal into a baseband audio signal for receipt by a microphone input of the radio, wherein the baseband audio signal comprises a digital representation of the image comprising a series of discrete tones, each tone having a wavelength corresponding to a discrete digital value for transmission as an RF audio signal;

a computer interconnected with the base receiver for converting the RF audio signals received from the audio module by the base receiver into image data; and

a data storage device for storing the image data.

2. A surveillance system as set forth in claim 1 further including

a microphone having an output;

an electrical connection having a first end and a second end, the first end connected to the audio module; and

a tap for permitting audio signals to be received by the radio, the tap having a first input, a second input and an output, wherein

the output of the microphone is attached to the first input of the tap, the second end of the electrical connection is attached to the second input of the tap, and the output of the tap is attached to the radio.

3. A surveillance system as set forth in claim 1 wherein the image data includes a computer file.

4. A surveillance system as set forth in claim 3 wherein the computer file includes a file name, a date stamp and a time of day stamp generated by the computer.

5. A surveillance system as set forth in claim 1 further including a waveform squaring circuit interconnected between the base receiver and the computer for converting the baseband audio signals into a square wave signal having defined edges.

6. A surveillance system as set forth in claim 5 wherein the computer includes a waveform measurement means and means for determining image pixel intensity from measured waveforms.

7. A surveillance system as set forth in claim 6 wherein the computer includes image data file storage memory for storing images in the form of pixel data.

8. A surveillance system as set forth in claim 1, further including a visual image, the visual image having a digital representation comprising a plurality of pixels, each pixel having one of a plurality of pixel intensity values.

9. A surveillance system as set forth in claim 8, wherein the electrical signal further comprises

a series of voltage levels, each voltage level having at least one of a first voltage level and a second voltage level for a predetermined time interval.

10. A surveillance system as set forth in claim 9, wherein

each pixel intensity value corresponds to a predetermined sequence of the series of voltage levels.

11. A surveillance system as set forth in claim 8, wherein the audio signal comprises

a series of waveforms, each waveform having at least one of a first waveform having a first length and a second waveform having a second length for a predetermined time interval.

12. A surveillance system as set forth in claim 11, wherein

each pixel intensity value corresponds to a predetermined sequence of the series of waveforms.

13. A surveillance system as set forth in claim 1 wherein the camera comprises a CCD solid state camera.

14. A surveillance system as set forth in claim 13 wherein the camera further includes an illumination source for illuminating a subject to be viewed by the camera.

15. A surveillance system as set forth in claim 13 further comprising a waveform generator interconnected between the camera and the audio module for transforming image data from the camera into the baseband audio signal for transmission by the audio module.

16. A surveillance system as set forth in claim 15 wherein the audio module includes an audio coupler constructed and arranged to generate the baseband audio signal from the audio signal and to transmit the airborne audio signal to a hand-held microphone.

17. A surveillance system as set forth in claim 13 wherein the camera further includes a means for generating a unique identification signal representative of the camera and the computer includes means for identifying the identification signal and storing the identification signal with image data derived from the signal.

18. A surveillance system as set forth in claim 17 further comprising means for storing image data based upon the identification signal so that image data relating to specific cameras can be accessed.

19. A surveillance system as set forth in claim 17 wherein the computer further comprises means for storing a time of receipt of the RF audio signal so that each image stored thereby includes a time of receipt data value.

20. An image transmission surveillance system using a radio having a remote transmitter and a base receiver comprising:

a camera for converting visual images into an electrical signal, wherein the camera comprises a CCD solid state camera, and wherein the camera further includes a frame grabber and digital memory for acquiring an image viewed by the camera;

an audio module for converting the electrical signal into a baseband audio signal for receipt by a microphone of the radio wherein the baseband audio signal comprises a digital representation of the image comprising a series of discrete tones, each tone having a wavelength corresponding to a discrete digital value for transmission as an RF audio signal;

a computer interconnected with the base receiver for converting the RF audio signals received from the audio module by the base receiver into image data; and

a data storage device for storing the image data.

21. A method for transmitting images from a remote location having a transmitter to a base station having a receiver comprising the steps of:

storing data of a viewed image in digital form;

converting stored data into a baseband audio signal for receipt by a microphone input of the radio, wherein the baseband audio signal comprises a digital representation of the image comprising a series of discrete tones, each tone having a wavelength corresponding to a discrete digital value;

transmitting the baseband audio signal via the transmitter to the base station as an RF audio signal;

converting the baseband audio signal received by the base station into digital data representative of the image; and

storing the digital data for subsequent review.

22. A method as set forth in claim 21 further comprising the steps of

recognizing receipt of the RF audio signal at the base station and

automatically deactivating a loudspeaker of the base station free of operator control thereof, in response to the step of recognizing.

23. A method as set forth in claim 21 further comprising the step of

keying, by an operator, a microphone of the transmitter and locating the microphone adjacent a speaker, the speaker outputting the baseband audio signal, thereby entering the baseband audio signal into the transmitter for subsequent transmission to the base station.

24. A method as set forth in claim 21 further comprising the step of

identifying an image of at least one subject from the stored digital data.

25. A method as set forth in claim 21 wherein the step of transmitting includes generating an audible audio signal from the audio signal and transferring the audible audio signal to the transmitter through a microphone.

26. A method as set forth in claim 25 further comprising illustrating the viewed image during the step of storing.

27. A method as set forth in claim 25 wherein the step of converting includes forming a square wave of the audio signal having edges and measuring distances between predetermined edges of the square wave.

28. A method as set forth in claim 27 wherein the step of converting further comprises deriving digital values from the distances of the edges and associating the digital values with image pixel values.

29. An image transmission surveillance system using a radio, having a remote transmitter, and a base receiver comprising:

a camera for converting visual images into a first electrical signal;

an audio module including a speaker for converting the first electrical signal into a baseband audio signal wherein the baseband audio signal comprises a digital representation of the image comprising a series of discrete tones, each tone having a wavelength corresponding to a discrete digital value for transmission as an RF audio signal;

the radio having a microphone for receiving the baseband audio signal and the remote transmitter for transmitting a radio signal representative of the baseband audio signal to the base receiver;

the base receiver receiving the radio signal and converting the radio signal into a second electrical signal;

a computer interconnected with the base receiver for converting the second electrical signal into image data; and

a data storage device for storing the image data.

30. A surveillance system as set forth in claim 29 wherein the baseband audio signal comprises a series of discrete tones, each tone having a wavelength corresponding to a predetermined digital value.

31. A surveillance system as set forth in claim 30 wherein the predetermined digital value corresponds to one of a predetermined number of pixel intensities in the image.