GB2258114A - Video monitoring system - Google Patents

Video monitoring system Download PDF

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Publication number
GB2258114A
GB2258114A GB9116202A GB9116202A GB2258114A GB 2258114 A GB2258114 A GB 2258114A GB 9116202 A GB9116202 A GB 9116202A GB 9116202 A GB9116202 A GB 9116202A GB 2258114 A GB2258114 A GB 2258114A
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GB
Grant status
Application
Patent type
Prior art keywords
data
system according
transmitted
transmission system
video
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9116202A
Other versions
GB2258114B (en )
GB9116202D0 (en )
Inventor
Rachel Mary Turner
Simon Francesco Fiera
Original Assignee
Rachel Mary Turner
Simon Francesco Fiera
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/18Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength
    • G08B13/189Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19654Details concerning communication with a camera
    • G08B13/1966Wireless systems, other than telephone systems, used to communicate with a camera
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/18Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength
    • G08B13/189Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19665Details related to the storage of video surveillance data
    • G08B13/19667Details realated to data compression, encryption or encoding, e.g. resolution modes for reducing data volume to lower transmission bandwidth or memory requirements
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/18Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength
    • G08B13/189Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19678User interface
    • G08B13/19684Portable terminal, e.g. mobile phone, used for viewing video remotely
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network, synchronizing decoder's clock; Client middleware
    • H04N21/438Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4382Demodulation or channel decoding, e.g. QPSK demodulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/04Systems for the transmission of one television signal, i.e. both picture and sound, by a single carrier
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/18Closed circuit television systems, i.e. systems in which the signal is not broadcast
    • H04N7/183Closed circuit television systems, i.e. systems in which the signal is not broadcast for receiving images from a single remote source

Abstract

A data transmission system 15 transmits video and audio data to a remote monitor (32, Fig 2) using a frequency modulated transmitter 18. The system may include a data compressor 12 for compressing data so as to transmit it more efficiently. The monitor (32, Fig 2) may be hand held, typically an LCD type, and may include an inverse compressor (30, Fig 2). In a preferred embodiment the invention is used as a remote baby monitor, the monitor being placed proximal to the baby's cot and the LCD monitor being carried by the baby's parent <IMAGE>

Description

APPARATUS FOR TRANSMITTING DATA This invention relates to an apparatus for transmitting data, and more specifically it relates to an apparatus for transmitting video and audio data.

Existing video and audio data transmission systems, such as those used in transmitting television signals, require large bandwidths in order to accommodate the very large amount of information to be transmitted in each video frame. Techniques exist which enable such information to be transmitted as efficiently as possible within any given bandwidth. In addition, data compression techniques employ data transform techniques to reduce the amount of data, so that certain types of data are not transmitted. This reduces the required bandwidth. Inevitably use of such data compression techniques leads to some loss of information. However, it is felt that sufficient data is still transmitted to enable a viewer, for example, to appreciate a picture of reasonable quality.

One possible data compression technique involves a so called discrete cosine transform (DCT).

The inventora have realised that certain disadvantages exist when a hard wire system is implemented between two locations. One such disadvantage has been that the cable between the two locations may have been difficult to. lay and such a system is relatively permanent. If it is desired to move either a camera at the "viewing end" or a monitor at the "display end", it has been necessary to lay a new connection wire between the camera and monitor.

According to one aspect of the present invention there is provided a video data transmission system which comprises means to select a portion of video data, a means for modulating a carrier signal with the data and a radio transmitter, arranged to transmit the modulated video data.

Preferably means is provided which compresses the data prior to modulation of the carrier signal.

According to another aspect of the present invention there is provided a video data receiver comprising: an antenna, a demodulator, a filter arranged to filter a received signal, and a data recovery unit arranged to provide a data stream, to a video driver such that in use a signal is provided to drive a video display.

Preferably the transmitter and receiver have a data compressor and an inverse compressor respectively.

Preferably audio signals are transmitted in synchronism with the video signals. The audio signals are preferably transmitted using sub-carrier modulation.

According to a further aspect of the present invention a remote monitoring system comprises: an image detector, an encoder for converting a detected image, a transmitter for sending said encoded image to a receiver; the receiver having means to decode the data and to drive a display unit, characterised in that the data is transmitted by frequency modulation.

Preferably audio data is encoded and transmitted with the image data.

Because of the cable free nature of the system it is particularly useful to use of the transmitter and receiver system as a baby monitor. A CCD camera could be placed in close proximity to a cot or bed and aimed at a baby. A receiver unit incorporating a display device, preferably an LCD, could be carried around the house or garden.

Another application of the system could be as a surveillance device for use on large sites such as sports stadia, industrial plants, hospitals or factories. Because a relatively lightweight viewing apparatus may be carried, a night watchman may be able to view one of several different shots of areas from different cameras simply by tuning to a different channel. In this application an Infra Red illumination and detection system may be required. Another possible application could be as a porch entrance monitor.

It is possible to arrange a data transmission and reception system to have a slow update of an image. In this case, a data compressor may not be required.

However, it is felt that with data compression an image may be obtained having good resolution characteristics which may be updated more frequently. The frequency of updating depends on the efficiency of a coding algorithm and the efficiency of the transmission, tuning and filtering system, and also the chosen resolution of the image transducer.

A further way of enhancing image quality would be to use two or more sub-carriers and to split the data accordingly so as to transmit portions of data in parallel. Such a system would probably be more expensive and may require fine filter apparatus to avoid interference, however situations may be invisaged which would warrant such extra expense.

An embodiment of the invention will now be described, by way of an example only, and with reference to the Figures in which: Figure 1 shows a block diagram of an image and audio detector, coder and transmitter; and Figure 2 shows a block diagram of a receiver and demodulator audio output system and video decoding and output system.

Referring to the Figures, an image is received at the video camera 10. A charge coupled device, CCD, based image transducer converts the image into a series of signals, the data is channelled from the camera 10 to an interface unit 11. This data is preferablycompressed by a data compressor unit 12, however a low-cost system could be envisaged omitting this stage. It is of course possible to incorporate a data compressor 12 into all image sensing devices and then to switch the data compressor into circuit when upgrading a system.

Alternatively the arrangement in the dotted box 15 may be purchased and used to upgrade an existing video camera.

The system will now be described with reference to the data compressor 12 and transmission of the compressed data signal. A sub-carrier modulator 13 modulates an input signal with the compressed data signal and mixes it at mixer 14 with an amplified audio signal received from microphone 16. The audio and video signals are then transmitted by a low power FM transmitter 18. The range of the FM transmitter is typically 20 to 50 metres for domestic use but may be upgraded for television surveillance in certain circumstances.

The modulated signal is received at antenna 21 and demodulated by demodulator 22.

The signal is then split into audio and video signals. The audio signal passes through a decoder 23 and an amplifier 24 to a loud speaker 25. The image signal is filtered at bandpass filter 26 and synchronously demodulated in the circuit 27. Sub-carrier recovery occurs within the circuit 27. The signal is then further filtered by a lowpass filter 28 and in 29 data recovery takes place. The recovered data is then filtered using an inverse algorithm for example an inverse Discrete Cosine Transform algorithm by device 30. The data then passes to a driver 31. The driver 31 is arranged to drive a conventional cathode ray tube or an LCD display 32. Preferably an LCD display is driven, as this is more compact.

It will be appreciated that variation to the above embodiment may be made, without departing from the scope of the invention. For example by transmitting an amplitude modulated signal instead of a frequency modulated signal or a mixture of the two similar results may be achieved. In addition in-filling techniques may be used so as to permit a gradual build up of a video image instead of a conventional raster scan. Colour image transmission may be possible. Furthermore variation may be made to the type of video display device and image sensor.

Claims (15)

1. A remote monitoring system comprising: an image detector, an encoder for compressing a detected image; a transmitter for sending said compressed image to a receiver; the receiver having means to decode the data and to drive a display unit, characterised in that the data is transmitted by frequency modulation.
2. A system according to claim 1 wherein audio data is encoded and transmitted with the image data.
3. A system according to claim 1 or 2 for use as a baby monitor.
4. A system according to claims 1 or 2 for use as a security system.
5. A data transmission system comprises means to select a portion of video data, means for modulating a carrier signal with the data and a radio transmitter, arranged to transmit the modulated carrier signal.
6. A data transmission system according to claim 5 wherein means is provided for compressing the data prior to modulation of the carrier signal.
7. A data transmission system according to claims 5 or 6, wherein audio signals are transmitted in synchronism with video signals.
8. A data transmitter according to claims 5 or 6 wherein a data compressor is provided within the transmitter.
9. A data transmission system according to claims 5 or 6 wherein audio signals are transmitted in synchronism with video signals.
10. A data transmission system according to any of claims 5 to 9 wherein the video signals are transmitted using sub-carrier modulation.
11. A data receiver comprising: an antenna, a demodulator, a filter arranged to filter a received signal; and a data recovery unit arranged to provide a data stream, to a video driver such that in use the signal is provided to drive a video display.
12. A data receiving system according to claim 11 wherein an inverse compressor is provided within the receiver.
13. A remote monitoring system according to any of claims 1 to 4 wherein the monitoring system comprises a CCD camera.
14. A data transmission system according to any of claims 5 to 10 wherein the monitoring system comprisses a CCD camera.
15. A data transmission system substantially as herein described with reference to the figures.
GB9116202A 1991-07-26 1991-07-26 A remote baby monitoring system Expired - Fee Related GB2258114B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9116202A GB2258114B (en) 1991-07-26 1991-07-26 A remote baby monitoring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9116202A GB2258114B (en) 1991-07-26 1991-07-26 A remote baby monitoring system

Publications (3)

Publication Number Publication Date
GB9116202D0 GB9116202D0 (en) 1991-09-11
GB2258114A true true GB2258114A (en) 1993-01-27
GB2258114B GB2258114B (en) 1995-05-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB9116202A Expired - Fee Related GB2258114B (en) 1991-07-26 1991-07-26 A remote baby monitoring system

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GB (1) GB2258114B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2288300A (en) * 1994-04-05 1995-10-11 Christopher Robert Turner Video surveillance system using spread spectrum radio communication
GB2288511A (en) * 1994-04-15 1995-10-18 David Harris Diagnostic method and apparatus
GB2359952A (en) * 2000-03-02 2001-09-05 Michael Benedict Bergamasco Security camera
NL1014735C2 (en) * 2000-03-23 2001-09-25 Lbl Trading Cv Alarm Method and apparatus.
GB2393343A (en) * 2002-08-28 2004-03-24 Oladiran Lawoye Wireless video network
GB2427318A (en) * 2005-06-13 2006-12-20 Hendrickson John Mobile security system
CN102404552A (en) * 2010-09-19 2012-04-04 曾斌 Monitoring system for operating room

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688029A (en) * 1968-09-23 1972-08-29 Otto E Bartoe Jr Cableless acoustically linked underwater television system
GB1602168A (en) * 1977-04-01 1981-11-11 Schraaf Abe V D System for the transmission of slow-scan television images
US4518994A (en) * 1982-12-20 1985-05-21 Rca Corporation Communication system compandor
US4682225A (en) * 1985-09-13 1987-07-21 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Method and apparatus for telemetry adaptive bandwidth compression
GB2186148A (en) * 1986-02-03 1987-08-05 Sayzen Ltd An aircraft surveillance system
GB2201563A (en) * 1987-02-23 1988-09-01 Sayzen Ltd A surveillance system
EP0281427A2 (en) * 1987-03-05 1988-09-07 Curtis M. Brubaker Radio controlled toy
US4855822A (en) * 1988-01-26 1989-08-08 Honeywell, Inc. Human engineered remote driving system
GB2222338A (en) * 1988-08-27 1990-02-28 Plessey Co Plc Remote operated vehicle control

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2064189A (en) * 1979-11-09 1981-06-10 Ascotts Ltd Surveillance System

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688029A (en) * 1968-09-23 1972-08-29 Otto E Bartoe Jr Cableless acoustically linked underwater television system
GB1602168A (en) * 1977-04-01 1981-11-11 Schraaf Abe V D System for the transmission of slow-scan television images
US4518994A (en) * 1982-12-20 1985-05-21 Rca Corporation Communication system compandor
US4682225A (en) * 1985-09-13 1987-07-21 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Method and apparatus for telemetry adaptive bandwidth compression
GB2186148A (en) * 1986-02-03 1987-08-05 Sayzen Ltd An aircraft surveillance system
GB2201563A (en) * 1987-02-23 1988-09-01 Sayzen Ltd A surveillance system
EP0281427A2 (en) * 1987-03-05 1988-09-07 Curtis M. Brubaker Radio controlled toy
US4855822A (en) * 1988-01-26 1989-08-08 Honeywell, Inc. Human engineered remote driving system
GB2222338A (en) * 1988-08-27 1990-02-28 Plessey Co Plc Remote operated vehicle control

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2288300A (en) * 1994-04-05 1995-10-11 Christopher Robert Turner Video surveillance system using spread spectrum radio communication
GB2288511A (en) * 1994-04-15 1995-10-18 David Harris Diagnostic method and apparatus
GB2359952A (en) * 2000-03-02 2001-09-05 Michael Benedict Bergamasco Security camera
NL1014735C2 (en) * 2000-03-23 2001-09-25 Lbl Trading Cv Alarm Method and apparatus.
WO2001073714A1 (en) * 2000-03-23 2001-10-04 Lbl Trading Cv Alarm method and device
US7054415B2 (en) 2000-03-23 2006-05-30 Marchfun International N.V. Alarm method and device
GB2393343A (en) * 2002-08-28 2004-03-24 Oladiran Lawoye Wireless video network
GB2427318A (en) * 2005-06-13 2006-12-20 Hendrickson John Mobile security system
CN102404552A (en) * 2010-09-19 2012-04-04 曾斌 Monitoring system for operating room

Also Published As

Publication number Publication date Type
GB2258114B (en) 1995-05-17 grant
GB9116202D0 (en) 1991-09-11 grant

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20030726