EP0483140A1 - Integriertes langsames abtastungs- und alarmsystem. - Google Patents
Integriertes langsames abtastungs- und alarmsystem.Info
- Publication number
- EP0483140A1 EP0483140A1 EP89912440A EP89912440A EP0483140A1 EP 0483140 A1 EP0483140 A1 EP 0483140A1 EP 89912440 A EP89912440 A EP 89912440A EP 89912440 A EP89912440 A EP 89912440A EP 0483140 A1 EP0483140 A1 EP 0483140A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slow scan
- event
- alarm
- alarm system
- integral
- 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
Links
- 238000004891 communication Methods 0.000 claims description 19
- 230000006854 communication Effects 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 7
- 230000006870 function Effects 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims 2
- 238000013500 data storage Methods 0.000 claims 1
- 230000000977 initiatory effect Effects 0.000 claims 1
- 238000012546 transfer Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 230000001413 cellular effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005055 memory storage Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000003750 conditioning effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- NSMXQKNUPPXBRG-SECBINFHSA-N (R)-lisofylline Chemical compound O=C1N(CCCC[C@H](O)C)C(=O)N(C)C2=C1N(C)C=N2 NSMXQKNUPPXBRG-SECBINFHSA-N 0.000 description 1
- 101150087426 Gnal gene Proteins 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- QHGVXILFMXYDRS-UHFFFAOYSA-N pyraclofos Chemical compound C1=C(OP(=O)(OCC)SCCC)C=NN1C1=CC=C(Cl)C=C1 QHGVXILFMXYDRS-UHFFFAOYSA-N 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/189—Actuation 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
- G08B13/194—Actuation 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
Definitions
- the present invention relates to a system integrating the func ⁇ tions of remote alarm communication, video picture storage and slow scan picture transmission.
- Remote alarm communicators were developped to enable the moni ⁇ toring of alarm detection devices using widely available, low cost, low bandwidth communication channels. Systems have been developped that provide adequate monitoring of alarm situations but do not give an accurate timed record of the sequence of events at the protected premisis. In addition when it has been required in the past to implement a remote alarm facility in ⁇ corporating a slow scan capability it has been necessary to utilise separate equipments for the two functions or use a slow scan system with limited alarm capability. Further, develop ⁇ ments of slow scan systems have traditionally concentrated on achieving improvements in picture quality and transmission times rather than ensuring useful picture content and ease of operation.
- Such slow scan systems are described in GB-A-1567660 or GB-A-2201563.
- the object or the present invention is to provide a remote alarm facility incorporating an integral slow scan function thereby giving improved corrolation between alarm events and the associated picture.
- a further object is to improve and extend the remote alarm reporting to cover numerous other events associated with the remote system.
- a further object is to provide accurate chronological record of the events at the remote site and to provide this without the need for an absolute time reference at each remote site.
- a further object is to provide a system that can cope with a wide variety of users needs through the use of a flexible and easily accessible configuration structure.
- a further object is to provide a system that can be used in mobile applications without the need for a wired connection.
- Event and picture information is stored in a transmitter unit along with an associated time reference. As dictated by system configuration, the stored information can be either ignored if the events are defined as insignificant, or communicated if an event is defined as significant. Particular types of events, known as alarm events, can, as dictated by configuration, be made to cause the storage of one or more pictures in a digital memory.
- the picture source is selected with an integral video switch. Once a significant event has been encountered a pre ⁇ configured telephone number is dialled.
- the telephone connection can be made by normal wired means or for mobile applications via radio or other non-wired technique (eg. Cellnet (Cellular Network) or radio telephone).
- a receiver unit on answering the call, requests the transfer of the event data from the transmitter unit via the telephone connection now established.
- the time reference is also transferred and both this and the associated event displayed to a system operator via a standard video monitor. If the receiver detects that pictures have been stored at the transmitter this is signalled to the operator. Pictures are transferred on request over the same communication channel as used for event information. Once transferred both event and picture information is stored at the receiver unit. User specific configuration data is held in electrically eraseable none volatile memory. Configuration changes can be made using the same communication channel as used for event information.
- integrated slow scan alarm apparatus comprising two individual units, one dedicated to the function of event and slow scan storage and transmission and the other to the function of event and slow reception and display.
- the transmission unit will include a means for video input switching allowing the selection of one of a number of video sources.
- the unit may also include a method of video signal digitisation control such that the video signal range is matched to that of the memory storage means.
- the unit may also include a video sync detection means to inform the micropro ⁇ cessor controlling means of the condition of the selected video source.
- the unit may also include a means for allowing the microprocessor controlling means to request the storage of a frame of video information in the memory storage means .
- the unit will provide a mode of operation allowing the signals presented on the alarm input means to cause the storage of a frame of video information.
- the unit may also include a queueing means such that alarms or other events detected by the unit are stored in chronological order.
- the unit may also include a timing means such that the relative time of the alarms or events stored by the queueing means are stored alongside the associated alarm or event.
- the receiver unit will provide a method of user con ⁇ trol allowing selection of various displays of event and slow scan information sent from the transmitter unit via the low bandwidth channel.
- the unit may also include a serial communi- cation interface providing listed output of all stored events at the transmitter unit. Additionally the unit may provide an interface to a P.C. to enable the local and remote upload and download of transmitter and receiver configuration details.
- fig. 1 is a schematic block diagram of a transmitter unit fig. 2 is a schematic block diagram of a receiver unit and fig. 3 is a schematic block diagram of a mobile application of the system.
- the system essentially consists of two matching equipments, a transmitter unit capable of accepting alarm and video informa ⁇ tion and sending this via a dial up telephone connection to a receiver unit for subsequent display and logging.
- the receiver unit can have up to twenty asso- ciated transmitter units, only one of which may be connected at a time.
- a microprocessor control and coor ⁇ dination subsystem (1) handles all the decision, monitoring and communication aspects of the unit.
- Alarms are interfaced via the conditioning and protection circuit (2) to the alarm multi ⁇ plexer (3).
- Alarm scanning is performed under the control of the microprocessor (1) whereby each alarm is selected in turn and monitored using the alarm window comparator (4).
- the status of each alarm is stored and also displayed if dictated by con ⁇ figuration details.
- a separate alarm conditioning and protec ⁇ tion circuit (5) and window comparator (6) is used for the special alarm "Tamper", whenever an intruder tries to destroy the system, its alarm sensors or wiring.
- the event caused by an alarm si ⁇ gnal can be made to cause one or more picture captures from one or more video sources v.
- the video source selection switch (7) places the required video signal onto signal line (8) allowing sync separator (9) to provide synchronising pulses to pixel clock (10) and raster address counters (11). The binary address count provided by these counters changes every four pixels thus providing a count at one quarter of the fast scan rate.
- the video signal (8) is also fed to video peak detectors (12). Under the control of the active area signal (13) the peak detectors pick out the blackest and whitest parts of the picture but only for those parts of the picture that are to be digitised.
- the vol ⁇ tage output (14) from the peak white detector is then used to define the upper limit of digitisation level (corresponding to maximum digital code).
- the voltage output from the peak black detector is used to define the lower limit of digi ⁇ tisation level (corresponding to minimum digital code).
- the A/D convertor (16) uses the voltages from the peak detectors and provides a 6 bit output for each pixel. In order to inter ⁇ face with the video memory array at a slow enough cycle rate the digitised pixels are fed through the video shift register (17) so that the video memory storage rate is one quarter of the pixel sampling rate. Pixels are written into the video me- ory (18) under the control of the capture request logic (19).
- the capture logic waits for the start of the next video field and then begins to issue write pulses to the memory (18) until the field is com ⁇ plete. Since the video memory can hold up to four pictures the identification of the store to be written is provided by the write store select signal (20). So that it is possible to determine exactly what area of the picture is being digitised the active area signal (13) is fed to the active area insertion circuit (21). This causes the digitised area to be shown on a monitor (M) in circuit (21). This causes the digitised area to be shown on the monitor in higher intensity and higher contrast than its surroundings.
- the microprocessor will begin an auto calling sequence to a predefined telephone number via the telephone line interface (22).
- data is transferred via the F.S.K. generator (23) and F.S.K. demodulator (24).
- Dial tone detector (25) and Carrier detector (26) provide normal tele ⁇ phone line and modem supervision. Data is transmitted at all times except when a slow scan picture is requested by the re- DCver.
- a low amplitude signal is sent from the F.S.K. generator (23) to the telephone line interface (22).
- the telephone line interface (22) is so ar ⁇ ranged that it's impedance partially matches that of the F.S.K. modulator when exchange battery is present and completely mis ⁇ matches it when exchange battery is absent. This leads to a change in the amplitude of the reflected signal such that a low amplitude reflection occurs when partially matched and a high amplitude when not matched.
- This signal is in turn either detec ⁇ ted or not by the carrier detector (26). The signal from the carrier detector then gives a direct indication of the presence or absence of exchange battery voltage.
- the microprocessor When slow scan mode is entered the microprocessor begins to read pixel data from the video memory array (18). This is achieved by the processor providing the address of the required pixel to the address selection multiplex (27). This address contains the store select identity in addition to the pixel address within the store. Once the address is set up the processor activates the pixel request logic (28) which waits for the next read access period and produces the required memory access signals to read the pixel and clock it into the pixel output latch (29). Pixels read in this way are passed through a buffer in the microprocessor to equalise timing and thence to the F.M. modulator (23). All timing and synchronisa ⁇ tion signals are provided by the processor.
- the phase of the transmitted F.M. carrier is synchronised to the leading edge of each slow scan line sync pulse. Since every line sync pulse has the same duration the phase of the F.M. carrier in relation to the trailing edge of the sync pulse will be the same irrespective of the data content of the previous line. Variation in timing for each line of slow scan caused by the high modulation index used is thus virtually eliminated.
- an interlaced scheme is adopted. On the first slow scan field only the even memory rows are accessed. At the end of this field a second scan is started but this time the odd rows are accessed. To stop the picture at the receiver being interlaced with a previous picture the receiver writes both the odd and even rows on the first interlaced field.
- Configuration information is maintained at the transmitter unit in an electrically eraseable PROM memory (1).
- Data is thus non volatile but easily modified by suitable commands to the opera- ting software. These commands are generated by a special pro ⁇ gramming software running on a standard P.C.
- the P.C. can be connected directly to the transmitter unit or remotely via the data channel set up with a receiver unit. Remote configuration provides all the facilities of local configuration.
- a microprocessor control and coordination sub ⁇ system (30) handles all the display, Man Machine Interface and communication aspects of the unit.
- the telephone line interface (31) responds to an incoming call by passing the ringing vol- tage cadence to the microprocessor for assimilation. If all conditions are right then the microprocessor waits for a gap in the ring cadence and then answers the call by activating the line holding loop in the telephone line interface (31). After going on line the receiver attempts to establish data communi- cation with the calling transmitter. Serial data sent from the microprocessor is modulated for transmission by the F.S.K. mo ⁇ dulator (32). The signals thus generated are low pass filtered by filter (33) and passed to the telephone line interface (31) and thence to line.
- F.S.K. signals received from the remote transmitter are passed via band pass filter (34) to remove un ⁇ wanted out of band noise and then to the F.S.K. demodulator (35).
- the demodulated serial data is then passed to the micro ⁇ processor for error checking.
- the carrier detect circuit (36) provides for the determination of the presence of both data and slow scan carrier tones.
- a similar scheme is adopted for the detection of exchange battery voltage as used in the transmit ⁇ ter unit except that the dial tone detector is employed.
- the dial tone detector (37) is used to confirm the presence of telephone dial tone before routing digits are sent to line when a call is initiated from the receiver. Outgoing calls are made when it is required to check a transmitter unit's operation in the absence of an alarm situation. When slow scan pictures are transferred from the transmitter unit the F.M.
- the analogue slow scan signal is then passed to the analogue to digital converter (51) which produces a 7 bit output. Even though the transmitter unit only provides a 6 bit signal (equivalent to 64 gray shades) the extra gray scale resolution provided by the receiver's 7 bits (equivalent to 128 gray shades) provides for improved picture quality due to the analogue nature of the transmission scheme adopted.
- the analogue slow scan signal is also fed to the sync separation circuit (52) where an accurate timing reference is obtained.
- the Man Machine Interface on the receiver unit is provided via a dedicated keypad with integral indicators (38) for user prompting and command entry.
- the monitor (39) pro ⁇ vides for both a textual display (for information such as chro- nological event lists) and a picture display with associated textual identification at top and bottom.
- the keypad and asso ⁇ ciated indicators (38) are driven directly from the micropro ⁇ cessor (30).
- the monitor display (39) is handled as follows: Under the control of the microprocessor (30) the display con- troller (40) provides the required signals to access the pic ⁇ ture and text memory (41). This memory is made up of standard video DRAM (VRAM) and is thus, by nature, dual ported.
- VRAM video DRAM
- each screen pixel has one byte (i.e. 8 bits) associated with it. Seven of the serial outputs (bits) of the memory are passed to the digital to analogue con ⁇ verter (42) to provide 128 gray shades when a picture is dis ⁇ played. The other one serial output(bit) bypasses the conver ⁇ ter and both this and the converted signal are fed to the pic- ture or text selection switch (43). This switch is operated at suitable moments in the raster display by the display control ⁇ ler (40) which is in turn overseen by the microprocessor to provide full text or mixed text and picture displays. The basic timing reference for the display is provided by the pixel clock (44). This reference is fed to the display controller (40) and T.V.
- sync generator (45) The sync generator provides the sepa ⁇ rate line and field synchronisation signals for use by the dis ⁇ play controller (40) in formatting the screen.
- a mixed sync signal is also produced by the T.V. sync generator (45) which is fed to the sync insertion circuit (46).
- the syncs are added to the video signal fed from the picture or text switch (43) thus providing a standard composite output signal.
- Two serial channels are provided for connecting external data equipment.
- One channel the printer interface (47), provides for the connection of a standard serial printer thus allowing the hard copy logging of all event communication with the transmit ⁇ ter unit.
- the receiver prompts the operator by an audible buzzer, a flashing indicator on the front panel (38) and the display of an identification message on the monitor (39).
- the buzzer and flashing indicator are cancelled and the display changed to show a chronicological list of transmitter unit events.
- Each event has displayed with it an absolute time of occurance.
- the time shown for each event is not provided directly by the transmitter unit but is calculated by the receiver from a relative time sent by the transmitter unit along with each event.
- the time reference for the events in any one communication call is the first sig ⁇ nificant event of the call (i.e. the event that initiated the call). All subsequent events are timed in relation to this first event.
- the receiver When communication is established between the transmitter and receiver units the receiver must determine the absolute time that relates to the time of the first or reference event. This is achieved by having the transmitter unit send its current relative time reference as soon as communication is achieved. By substracting this relative time from its current absolute time (by means of a watch T e.g. provided in the Receiver Unit) the receiver determines the absolute time for the reference event. All subsequent absolute event times are the obtained by simply adding the relative time sent with the event to the absolute reference event time.
- a full screen low definition picture can be transmitted in 8 seconds.
- a full screen high definition picture can be transmitted in 32 seconds. If three or four pictures have been stored at the transmitter unit then a quad picture of 3 or 4 low definition pictures can be transmit- ted in 32 seconds.
- Once transmitted the operator has the option to re-transmit the same picture in the same or different format. The same format may be chosen if telephone line noise has cor ⁇ rupted some important detail of the picture. An alternative format may be chosen if, for instance, a picture was originally transmitted in low definition and it is thought that more picture detail would be useful.
- the receiver In addition to the event related picture capture and transmis ⁇ sion the receiver also provides for continuous monitoring from any one or all four transmitter video sources. By pressing the relevant slow scan key the receiver instructs the associated transmitter unit to first capture and then send pictures in any one of the three formats. Re-transmission is again provided as described for event related pictures.
- the receiver unit also provides remote control and tellback of the relays at the associated transmitter.
- the fault log main ⁇ tained by the transmitter unit can be read on request as an aid to system fault location.
- the transmitter (fig. 1, 53 fig. 3) and/or receiver units (fig. 2, 54 fig. 3) are used in conjunction with a non-wired low bandwidth connection such as Cellnet (Cellular Network) or radio telephone 56.
- a non-wired low bandwidth connection such as Cellnet (Cellular Network) or radio telephone 56.
- the dialled digits from either transmitter 53 or receiver 54 can be inhibited allowing a direct or presetected communication path to be used.
- Radio transceivers 55 for wireless communication can be integrated into associated transmitter 53 or receiver 54 if required.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Alarm Systems (AREA)
- Burglar Alarm Systems (AREA)
- Closed-Circuit Television Systems (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP89307232 | 1989-07-17 | ||
EP89307232 | 1989-07-17 | ||
PCT/EP1989/001294 WO1991001539A1 (en) | 1989-07-17 | 1989-10-30 | Integrated slow scan and alarm system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0483140A1 true EP0483140A1 (de) | 1992-05-06 |
EP0483140B1 EP0483140B1 (de) | 1995-02-08 |
Family
ID=8202737
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89912440A Expired - Lifetime EP0483140B1 (de) | 1989-07-17 | 1989-10-30 | Integriertes langsames abtastungs- und alarmsystem |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0483140B1 (de) |
AT (1) | ATE118286T1 (de) |
AU (1) | AU4513189A (de) |
DE (1) | DE68921079T2 (de) |
WO (1) | WO1991001539A1 (de) |
Families Citing this family (2)
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 |
JP4612906B2 (ja) | 2003-09-12 | 2011-01-12 | キヤノン株式会社 | シーケンスを送信する方法、装置、及びコンピュータ・プログラム |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1567660A (en) * | 1977-01-07 | 1980-05-21 | Robot Research Inc | System for storing videoo information occurring at slow and fast scan rates |
AU520219B2 (en) * | 1978-08-25 | 1982-01-21 | Commercial Data Processing Ltd. | Video security alarm system |
EP0028933A3 (de) * | 1979-11-09 | 1981-06-03 | Ascotts Ltd. | Überwachungssystem |
FR2593309B1 (fr) * | 1986-01-23 | 1990-02-16 | Gestion Inf Nle Et | Dispositif et procede de surveillance a distance de sites comportant des moyens de detection d'evenements anormaux, des moyens d'ecoute phoniques et des moyens d'observation video |
EP0290548B1 (de) * | 1986-11-25 | 1994-05-04 | ZONE TECHNOLOGY PTY. Limited | Digitales bilderfassungssystem |
-
1989
- 1989-10-30 AU AU45131/89A patent/AU4513189A/en not_active Abandoned
- 1989-10-30 DE DE68921079T patent/DE68921079T2/de not_active Expired - Fee Related
- 1989-10-30 AT AT89912440T patent/ATE118286T1/de not_active IP Right Cessation
- 1989-10-30 EP EP89912440A patent/EP0483140B1/de not_active Expired - Lifetime
- 1989-10-30 WO PCT/EP1989/001294 patent/WO1991001539A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9101539A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1991001539A1 (en) | 1991-02-07 |
EP0483140B1 (de) | 1995-02-08 |
DE68921079T2 (de) | 1995-08-10 |
AU4513189A (en) | 1991-02-22 |
DE68921079D1 (de) | 1995-03-23 |
ATE118286T1 (de) | 1995-02-15 |
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