EP1586194A1 - Procede d'enregistrement fiable de donnees video/audio par l'intermediaire d'un reseau numerique - Google Patents

Procede d'enregistrement fiable de donnees video/audio par l'intermediaire d'un reseau numerique

Info

Publication number
EP1586194A1
EP1586194A1 EP04701303A EP04701303A EP1586194A1 EP 1586194 A1 EP1586194 A1 EP 1586194A1 EP 04701303 A EP04701303 A EP 04701303A EP 04701303 A EP04701303 A EP 04701303A EP 1586194 A1 EP1586194 A1 EP 1586194A1
Authority
EP
European Patent Office
Prior art keywords
data
recording
recording device
digital network
transmission
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.)
Ceased
Application number
EP04701303A
Other languages
German (de)
English (en)
Inventor
Michael Gilge
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1586194A1 publication Critical patent/EP1586194A1/fr
Ceased legal-status Critical Current

Links

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
    • G08B13/196—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 using television cameras
    • G08B13/19654—Details concerning communication with a camera
    • G08B13/19656—Network used to communicate with a camera, e.g. WAN, LAN, Internet
    • 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
    • G08B13/196—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 using television cameras
    • G08B13/19665—Details related to the storage of video surveillance data
    • G08B13/19669—Event triggers storage or change of storage policy
    • 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
    • G08B13/196—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 using television cameras
    • G08B13/19665—Details related to the storage of video surveillance data
    • G08B13/19671—Addition of non-video data, i.e. metadata, to video stream
    • G08B13/19673—Addition of time stamp, i.e. time metadata, to video stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
    • H04N19/89—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H04N5/77—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H04N5/77—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera
    • H04N5/772—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera the recording apparatus and the television camera being placed in the same enclosure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/781—Television signal recording using magnetic recording on disks or drums

Definitions

  • the invention relates to a recording method for data that was or is generated in chronological order from a data source and is transmitted to at least one recording device for storage via a digital network.
  • An example of data that is generated at a data source in chronological order is video / audio data.
  • a recording device which comprises, for example, a camera or a microphone, generates a data stream which contains corresponding image information or sound information, the chronological order of the data being of essential importance.
  • Such recording methods are also known in connection with video data under the name NVR (networked video recording).
  • NVR networked video recording
  • the recording device feeds data streams of digital video and / or audio data into the digital network and the recording device, which is, for example, a computer with a sufficiently large storage capacity, records the data.
  • the recording takes place in particular for archiving and / or evaluation. Since the digital network is pre-existent and exists, in particular, independently of the recording device and the recording device, video surveillance systems, for example, can be formed in a simple manner.
  • the object of the invention is to create a recording method of the type mentioned at the outset by means of which the data can be recorded reliably.
  • this object is achieved in the recording method mentioned at the outset in that the data are stored at the data source before transmission on the digital network in such a way that the at least one recording device can be provided with data after a malfunction on the digital network which is available during the The duration of the disturbance was intended for transmission.
  • video data and audio data that they occur in the form of a data stream, since the data are generated in chronological order. If there is now a fault in the data transmission on the digital network, then the data recorded during the fault duration is missing on the recording device, so that there are data gaps there. Since the invention also provides for the data to be recorded at the data source, the data supplied during the period of the fault can be transmitted to the recording device after the data transmission has been interrupted in order to fill up the data gap there.
  • the solution according to the invention thus enables complete data recording to be implemented on the recording device, in which data losses are avoided.
  • Fault-tolerant network-based data recording can be achieved by the method according to the invention, ie error-free recording is ensured on the recording device even in the case of longer-lasting network problems, so that a complete gap-free data stream is stored on the recording device even in the case of network problems in the past.
  • a flexible, fault-tolerant system is provided.
  • the data generated in chronological order are video data and / or audio data.
  • the video / audio data are generated by at least one recording device which comprises a camera and / or a microphone.
  • a video server and / or audio server can also be provided, which converts analog image data or analog audio data into digital image data or digital audio data, which can then be transmitted accordingly on the digital network.
  • the said recording device, which the recording device directly is then assigned to the data memory, which temporarily stores data prior to transmission to the digital network for buffering, in order to be able to fill gaps in the data at the recording device which is to receive the data from the recording device in the event of transmission disturbances.
  • data is recorded and assigned to a data transmitter for data buffer storage.
  • the data transmitter can be, for example, a digital camera which provides digital video data or a video server which is connected downstream of an analog camera and converts the analog video data into digital data.
  • the data recording allows data to be buffered before being passed on to the digital network, in order to avoid data loss in the event of data transmission disruption on the digital network.
  • the recording of the data at the data source takes place independently of the recording of the data at the recording device, in order to be secured against data loss in the event of data transmission disturbances, which are caused, for example, by network inactivity or network overload.
  • data is recorded on a data receiver, namely the recording device.
  • the data is permanently recorded, in particular for archiving and evaluation.
  • test signals are sent via the digital network in order to be able to detect interference with data transmission on the digital network.
  • This can then both transmitter (for example the recording device) as well as the receiver of the actual data such as video data (the recording device) detect a fault and thereby recognize whether there are data gaps (on the recording device) or whether data corresponding to a data gap must be transmitted to the recording device.
  • the recording device can recognize whether data can be transmitted without interference.
  • a log book can then be created in which the status changes and in particular the times of status changes are registered. This in turn enables the data to be determined which arose during the disruption of the data transmission on the digital network. Furthermore, the data gaps can be recognized on the recording device.
  • a transmission of data recorded at the data source is initiated via the digital network if freedom from interference is detected after a disturbance in the data transmission.
  • the data recorded during the disruption of the data transmission can then be transmitted to the recording device in order to be able to fill a data gap there, so that the recording device in turn contains the complete data can archive and in turn the complete data is available for evaluation.
  • data recorded in accordance with the duration of the disturbance are then transmitted via the digital network to the at least one recording device, and in particular are automatically transmitted in order to be able to fill data gaps present on the recording device.
  • a repair of a data gap at the at least one recording device during the disturbance of the data transmission is carried out automatically by transferring the data recorded at the data source during the disturbance period to the at least one recording device.
  • At least one recording device requests data from the data source and in particular automatically requests it.
  • the recording device thus controls the "repair" of its data.
  • the recording device detects the fault and ensures that the missing data is transmitted to it.
  • the fault is then determined by the recording device by evaluating test signals sent via the digital network.
  • provision can also be made for one of the multiple recording devices of the data source to transmit and in particular automatically transmit data when a data transmission disturbance is detected.
  • the at least one recording device controls the repair of the data gaps on the recording device.
  • the recording device therefore has a corresponding intelligence.
  • Such a control can, for example, be integrated in a camera and / or a video server of the recording device. This solution is advantageous if a plurality of recording devices such as cameras are arranged decentrally, since the recording device can then provide the data recorded by it directly to the recording device.
  • the malfunction is then determined by one of the several recording devices of the data source, that is to say the recording device evaluates test signals sent via the digital network to determine whether there are or have been malfunctions that require the data to be repaired and in particular to fill in a data gap on the Requires recording device.
  • the recording device or recording devices send current data and stored data to the at least one recording device after detection of a fault. So two different types of data are sent, namely repair data and current data. These data records can be differentiated, for example, using time stamps. It is then ensured that a data gap in the past is filled at the same time and that no current data gap arises, that is to say the regular recording continues.
  • a data memory is provided for data recording of a data source.
  • the storage capacity for the data recording at the data source is preferably selected as a function of a transmission rate for the data and a predetermined expected maximum fault duration. In this way, for example, volatile memories or non-volatile memories such as hard disk drives can be set, their storage capacity and thus also their size and energy consumption being adaptable and in particular not having to be oversized.
  • the storage capacity is chosen so large that new data can be recorded from the data source during the data transmission of data from the data recording of a data source to the digital network.
  • the storage capacity is determined by multiplying the transmission rate by the expected maximum fault duration, adding a safety margin and doubling this capacity. The same amount of data can then be written into the data memory that is released to the recording device after a maximum fault duration of the digital network.
  • the reading out of data from the data memory on the recording device for the transmission of the data on the digital network is coupled with the writing in of new data into the data memory, with the data being written being more up-to-date than the data being read out.
  • the data recorded at the data source are only deleted when the data received from the at least one recording device has been checked for integrity.
  • Repair data are the data that have arisen on the digital network during a malfunction and are provided to the recording device to fill in (temporal) data gaps after the malfunction has ended.
  • the adjustability of the transmission rate enables an optimized adaptation to the actual conditions.
  • the transmission rate for repair data is greater than the transmission rate for current data.
  • This transmission rate for the repair data can be fixed or set, for example, by a user. It can be achieved in that data gaps are filled up quickly.
  • the transmission rate for repair data is lower than the transmission rate for current data.
  • Current data are the data that arise in "normal operation”. If the transmission rate for repair data is chosen to be lower than the transmission rate for current data, the load on the transmission channels and in particular on the digital network can be minimized. This can be useful, for example, if a large amount of repair data has arisen and a transfer of the repair data could interfere with the transfer of the current data.
  • the repair data to be transmitted are then in this queue; for example, the data can be ordered in order of importance according to their time stamps in the queue and important data can then be transmitted with priority.
  • the transmission rate for repair data can be chosen depending on the length of the queue. For example, the transmission rate can be selected to be lower if the queue is long in order to minimize the interference with normal data traffic due to the transmission of repair data.
  • the invention further relates to a recording device for video / audio data, which comprises an interface to a digital network for the transmission of data via the digital network.
  • the invention is based on the object of providing a recording device by means of which data can be securely transmitted on the digital network.
  • This object is achieved according to the invention in that a data memory is provided, via which data can be recorded before being forwarded to the digital network, in order to be able to provide data on the digital network after a transmission malfunction, which data was generated during the duration of the fault.
  • This recording device according to the invention is provided in particular for carrying out the recording method according to the invention and has the advantages described there.
  • a detection device is provided, by means of which test signals can be emitted to the digital network and can be detected via the disturbances in the data transmission.
  • the data transmission device can detect disruptions in the data transmission, that is to say the recording device has such an intelligence that it can itself determine a failure of the digital network.
  • the recording device itself to send repair data to fill in data gaps without being requested by the recording device.
  • the recording device itself can ensure a complete data record on the recording device in the area of responsibility of the recording device. This is particularly advantageous if a plurality of receiving devices are provided decentrally.
  • a registration device is provided, by means of which status changes with regard to disturbances in the data transmission can be registered. It is also advantageous if a control device is provided, by means of which data from the data memory, which have arisen during a data transmission disturbance on the digital network, can be transmitted to the digital network. The control device then ensures that the corresponding data is read out and transmitted on the digital network so that a data gap can be filled in on a recording device.
  • the recording device comprises a camera and / or a microphone.
  • the camera can be a digital camera.
  • An analog camera can also be provided, which is connected to a video server which converts the analog data into digital data. The same applies accordingly to a microphone.
  • the transmission rate for repair data can be set.
  • the setting can basically be made on the recording device and / or on the recording device which is connected to the recording device via the digital network.
  • the adjustability of the transmission rate for repair data enables flexible adaptation to the actual conditions.
  • the transmission rate can be selected to be small if a large amount of repair data is to be transmitted. This minimizes the influence on the data transmission of current data with a predetermined bandwidth of the data transmission.
  • a large transmission rate can also be set, for example, in order to be able to fill up data gaps quickly.
  • the invention further relates to a recording device for video / audio data, comprising:
  • a data memory for recording the data.
  • a detection device by means of which test signals can be emitted to the digital network and / or test signals can be received from the digital network in order to be able to detect interference in the data transmission from a recording device.
  • This recording device has the advantages already described in connection with the method according to the invention and the recording device according to the invention.
  • the recording method according to the invention can be carried out with this recording device.
  • the invention also relates to a recording system for video / audio data, this recording system comprising at least one recording device according to the invention and at least one recording device according to the invention.
  • this recording system comprising at least one recording device according to the invention and at least one recording device according to the invention.
  • Figure 1 is a schematic representation of an NVR video / audio system
  • Figures 2a, 2b is a schematic representation of the data recording in the event of network transmission failures
  • Figures 3a to 3d schematically show the data transmission after termination of a malfunction in the network transmission
  • Figure 4 is a schematic representation of components of an embodiment of a recording device according to the invention.
  • Figure 5 is a schematic representation of components of an embodiment of a recording device according to the invention.
  • Figure 6 is a schematic representation of an embodiment of a memory management according to the invention.
  • FIG. 7 shows a schematic illustration of a further exemplary embodiment of an NVR system
  • FIG. 8 schematically shows the memory content on a recording device in the NVR system according to FIG. 7.
  • a recording system for video / audio data based on the NVR principle (NVR - networked video recording), which is shown in FIG. 1 and is designated there as a whole by 10, comprises one or more recording devices 12, 14 which provide video / audio data. These video data and / or audio data are generated in chronological order and provided as digital data or converted into digital data and transmitted on a digital network 16 to a recording device 18 (network video recorder), which in particular the data supplied by the recording devices 12, 14 permanently recorded so that it can be archived and evaluated, for example.
  • the recording device 18 serves as a recording server.
  • the recording devices 12, 14 include cameras and / or microphones. It can be provided that a recording device (in FIG. 1 the recording device 12) has a digital camera 20 and / or a digital microphone; digital video data and / or audio data are then provided directly.
  • analog recording devices such as an analog camera 22 and / or an analog microphone are provided.
  • a video server 24 as an AD converter in order to be able to provide the corresponding digital data which can be transmitted on the digital network 16.
  • the digital network 16 is, in particular, a pre-existing network that is independent of the system 10.
  • the recording devices 12, 14 and the recording device 18 then have corresponding communication interfaces 25 (FIG. 4) and 29 (FIG. 5) with which they can each be coupled to the digital network 16 in order to be able to transfer data to the digital network 16, ie To be able to transmit data via the digital network 16 and to be able to receive data from the digital network 16.
  • the digital network 16 can be a public network, such as the Internet, an ISDN network, a GSM network or a UMTS network. However, it can also be a proprietary network, which is formed, for example, via leased lines. An example of such a network is a company-owned intranet.
  • the digital network 16 can be a local area network (LAN - local area network) or a non-local area network (WAN - wide area network).
  • the data is transmitted on the digital network 16 according to a specific protocol, such as TCP / IP.
  • video data and audio data there is a temporal data sequence, that is to say a data stream, the chronological sequence being of decisive importance for the evaluation and archiving.
  • the data are (inherently) provided with a time stamp which characterizes their chronological classification.
  • the data recorded in chronological order by the recording devices 12, 14 must also be recorded in this order on the recording device 18 in order to enable evaluation.
  • the problem with NVR systems 10 is that interference in data transmission on the digital network 16 can lead to gaps in the recording of the recording device 18.
  • the video data supplied, for example, by the digital camera 20 of the recording device 12 and / or the video server 24 of the recording device 14 . and / or audio data are also recorded at the data source in order to be able to provide data on the digital network 16 after a disturbance in the data transmission, which was generated by the digital camera 20 or the analog camera 22 during the duration of the disturbance:
  • each recording device 12, 14 is assigned a respective data memory 26, 28, by means of which the video data and / or audio data can be recorded at the data source before the data transmission, independently of the recording on the recording device 18.
  • the data memories 26, 28 can be volatile or non-volatile memories. However, non-volatile memories such as hard disk memories are preferred. Such data memories 26, 28 can be integrated in the housing, for example of the digital camera 20 or the video server 24, or can be arranged separately. However, they are each part of the associated receiving device 12 or 14.
  • the recording device 18 also has one or more data storage devices 30, such as hard disk drives, the storage capacity of the recording device 18 being substantially greater than the storage capacity of the data storage devices 26 and 28 at the data source.
  • the data recording on the recording devices 12, 14, ie on the data source takes place independently of the data recording on the recording device 18, ie the data receiver of the data transmitted by the recording devices 12, 14 via the digital network 16.
  • the recording devices such as the recording device 12, each comprise a control device 32, which can be implemented as a hardware solution or software solution, which controls the data recording on the data memory 26, i. H. controls in particular the writing and reading of data, these data being supplied by the digital camera 20.
  • a control device 32 which can be implemented as a hardware solution or software solution, which controls the data recording on the data memory 26, i. H. controls in particular the writing and reading of data, these data being supplied by the digital camera 20.
  • the control device 32 is coupled to the interface 25 in order to be able to send corresponding data to the digital network 16 and to be able to receive signals from the digital network 16.
  • a detection device 34 is provided, which is coupled to the interface 25, via which test signals (life check signals) can be sent to the digital network 16 and corresponding test signals can be received from the digital network.
  • test signals which are sent, for example, at fixed time intervals, serve to be able to detect interference in the data transmission on the digital network 16.
  • Such disturbances are caused, for example, by network components such as switches, routers or the like having failed, components being connected incorrectly or not to the digital network 16, or the data transmission rate on the digital network 16 being inadequate due to high network traffic.
  • the recording device 12 exchanges these test signals with the recording device 18, which also has a detection device 36 which is connected to the interface 29 there. By exchanging test signals between the recording device 12 (and possibly further recording devices 14 etc.) and the recording device 18, data transmission faults on the digital network 16 can be detected and registered both by the recording device 12 and by the recording device 18.
  • a registration device 38 is provided on the recording device 12 and a registration device 40 on the recording device 18.
  • These registration devices 38, 40 keep a logbook with regard to data transmission faults on the digital network 16, in particular with regard to the times of status changes in the faults. The time of a fault and the duration of such a fault are thus registered.
  • the recording device 12 can then generate information as to which video data and / or audio data (corresponding to a specific period of time) have not or not successfully been transferred to the recording device 18, ie which part of the data stream has not been transferred, and the recording device 18 can generate the corresponding information when there is a data gap in the recording due to faulty data transmission.
  • the registration devices 38 and 40 are synchronized with one another via the test signals, so that the registration devices 38 and 40 contain the same information regarding the time and duration of data transmission faults on the digital network 16.
  • the registration device 38 is connected to the control device 32 in order to be able to control a data transmission on the basis of the stored status information regarding data transmission malfunctions.
  • the registration device 40 is connected to a control device 42 of the recording device 18, this control device 42 controlling in particular the recording by the data memory or data 30.
  • the control device 42 of the recording device 18 is also connected to an evaluation device 44, via which the recorded data can be evaluated.
  • the method according to the invention works as follows:
  • the data are stored on the data source, such as the recording device 12, independently of the recording device 18, ie this data recording on the data source takes place upstream of the digital network 16 and is therefore independent of any data transmission problems on the digital network 16.
  • the storage capacity of the data memory 26 is thereby chosen such that video data and / or audio data are recorded at the data source for a predetermined period of time at a specific data transmission rate to the digital network 16 and on the digital network 16.
  • the predefined time period is adapted to the maximum expected time period of the data transmission disturbance. If, for example, the data transmission for the video / audio data stream is 1 Mbit per s and a maximum fault time of 8 hours is expected, the storage capacity of the data memory 26 is at least 4 GB if a security surcharge is also taken into account. This storage capacity should preferably be doubled in order to make it possible to write in data (to protect against data loss in the event of a possible network fault) while reading buffered data from the data memory 26.
  • FIGS. 2a and 2b schematically show the recording process during a data transmission fault 46 on the digital network 16.
  • the recording device 18 does not receive any recorded data, so that there is a data gap 48 in the recording of the data memory 30.
  • the fault 46 is shown as an example and is intended to symbolize every possible source of interference in the data transmission.
  • the disturbance can also lie, for example, in the area of the coupling of the data memory 26 or, for example, in the network 16.
  • the detection devices 34, 36 of the recording device 12 and the recording device 18 recognize the fault 46 by exchanging the test signals and the corresponding status information is stored in the registration devices 38, 40, so that the data gap 48 can be arranged in terms of time both on the recording device 12 and on the recording device 18, that is to say the time start of the data gap 48 and the time end of the data gap 48 (and thus also the time length of the data gap 48) are known.
  • An interference-free transmission on the digital network 16 is recognized by the exchange of the test signals by the test devices 34, 36. This state is indicated below the fault state 46 in FIG. 3a.
  • the data gap 48 is contained in the data record of the recording device 18, while the missing data are present in the data record at the data source, i. H. are contained in the data memory 26 (FIG. 3b).
  • the corresponding data 50 are now read out from the data memory 26 by the control device 32 on the basis of the entry in the registration device 38 and transmitted on the digital network 16.
  • the control device 42 of the recording device 18 places this data in the memory area of the data memory 30 which corresponds to the data gap 48 (FIG. 3c). This completes the data recording on the recording device 18, i. H. Complete data are available here without gaps and thus a complete data stream is also recorded there. This is indicated in Figure 3d.
  • the recording device 18 detects interference in the data transmission on the digital network 16 and initiates further steps on the basis of detected interference and in particular requests data from the recording device 12.
  • This data request is indicated schematically in FIG. 1 by arrow 54; the recording device 18 sends corresponding signals via the digital network 16 specifically to a recording device such as the recording device 12 or to all recording devices 12, 14 in order to cause them to send the data missing from the recording device 18.
  • the recording device 18 as the recording server therefore initiates the necessary steps itself after obtaining a transmission disturbance in order to obtain the missing data.
  • the receiving device 12 is “intelligent” and can itself detect faults in the digital network 16. After the detection of such a fault 16, the recording device 12 then initiates the necessary steps in order to provide the recording device 18 with the missing data.
  • This independent provision of data is indicated in FIG. 1 by the arrows 56 for the receiving device 12 and 58 for the receiving device 14.
  • the recording device 12 (or the recording device 14) then simultaneously sends current data for recording to the recording device 18 and stored data for filling a data gap on the recording device 18. Two types of data are therefore sent, namely current data and repair data.
  • the data packets can be distinguished, for example, by means of appropriate markings such as time stamps.
  • a solution in which the recording device or the recording devices determine faults and then independently provide repair data to the recording device 18 is particularly useful if, for example, a plurality of cameras 20, 22 are present.
  • the data provided by a recording device 12 have an inherent time stamp in particular.
  • the recording device 18 can, in particular via its control device 42, use the repair data in the correct place on the basis of the time stamp.
  • the capacity of the data memory 26 on the receiving device 12 or of the data memory 28 on the receiving device 14 is usually limited for reasons of space alone.
  • the video / audio data recording method according to the invention makes it possible to increase the storage capacity at the data source by forming a virtual data memory. This is shown schematically in FIG. 6 with the aid of the receiving device 14:
  • the data memory 28 of the recording device 14 has a certain capacity 52.
  • the data memory or memories 30 of the recording device 18 have a much higher capacity. It is now provided according to the invention that the data memory 28 and the data memory 30 are connected. This is described by way of example using a connection via the digital network 16.
  • the reading out of data from the data memory 28 for the transmission of this data on the digital network 16 can be logically coupled to the writing of new data into the data memory 28.
  • This coupling provides the video server 24 (or in the case of the recording device 12 of the digital camera 20) with a virtual data memory, the capacity of which is greater than the physical capacity of the data memory 28 (or 26).
  • a data memory with "infinite" capacity is thereby assigned to the recording device 12 or 14, wherein at least this virtual data memory has a capacity that is very much higher than the capacity of the data memory 28 of the recording device 14.
  • this data is copied, i. H. the same data record is present in the data storage 28 and on the other hand it is transmitted on the digital network 16 and then stored in the data storage 30. After successful recording of this data by the recording device 18 and checking that the data are intact, the transmitted data can then be deleted from the data memory 28.
  • the data is written into the data memory 28 continuously on the basis of the delivery of new data, for example by the analog camera.
  • the reading process of the data from the data memory 28 This data can also be transmitted continuously to the recording device 18 on the digital network 16 and in particular at the same speed as the writing of the data.
  • the data are read out from the data memory 28 at time intervals in the form of data packets and are then transmitted on the digital network 16.
  • This reading process is particularly controlled in that a certain capacity threshold is reached, such as a capacity threshold at or below 50% of the total capacity of the data memory 28.
  • the reading process ie the copying process then takes place at a speed which is greater than the write speed in the data memory 28.
  • This process of copying the data from the data memory 28 for transmission on the digital network 16 is controlled by the control device 32.
  • the control device 32 is in contact with the control device 42 of the recording device 18 in order to receive a release after receipt of transmitted data by the recording device 18 if the data received by the recording device 18 are intact. After such a release, the copied data can then be deleted from the data memory 26.
  • the inventive method for recording video / audio data allows the storage capacity of the recording device 14 (and any other recording devices 12) to be greatly increased. This can ensure that the data memory 28 at the data source does not reach its capacity limits.
  • the process of copying data between the data memory 28 of the recording device 14 and the data memory 30 of the recording device 18 takes place invisibly or transparently for the recording device 14; only a smaller part of the data is actually physically stored in the data memory 28 of the recording device 14. A larger part of the data is stored in the data memory 30, although the data contained in the data memory 30 can also be read out via the recording device 14. If a user wants to read out data on the recording device 14, he cannot differentiate whether the data originate directly from the data memory 28, i. H. are physically present there, or have been swapped out to data memory 30 and must first be retrieved from there.
  • the data storage device 30 or the recording device 18 is a central recording unit with respect to the recording devices 12 and 14, which can be used jointly by a plurality of independent recording devices in order to increase the storage capacity - virtually virtually - at the individual recording devices by the formation of a virtual data storage device , It was described above that the data memory 30 is arranged on a recording device 18 which is connected to the recording devices 12 and 14 via the digital network 16. However, it can also be provided that the connection is not made via a digital network, but rather, for example, via direct wiring.
  • the solution according to the invention can also intercept a disturbance in the data transmission on the digital network 16 during the data copying onto the digital network 16.
  • a recording device 60 which for example comprises a video server, has a plurality of recording devices 62a, 62b, 62c, 62d etc.
  • the recording devices are, in particular, cameras.
  • These recording devices 62a, 62b, 62c, 62d monitor different areas, and there may be different requirements with regard to the recording duration. These requirements can be based on practical considerations or also based on legal regulations. For example, there are regulations that the data for emergency exits must be kept for 90 days at certain locations. Different recording durations can therefore be provided for differently observed areas (corresponding to the different recording devices and in particular cameras 62a, 62b, 62c, 62d).
  • a data memory 64 of the recording device 60 has a certain recording capacity, such as 24 hours (indicated in FIG. 8 by the upper part of the figure).
  • a recording device 66 with a data memory 68 which has a considerably larger capacity than the data memory 64, serves as a recording server for the data provided by the recording device 60 via the digital network 16. Via this data memory 68, a virtual data memory as described above is formed for the recording device 60, by means of which the capacity limitations of the data memory 64 can be canceled.
  • the data memory 68 has reserved memory areas 70a, 70b, 70c, these memory areas corresponding to the corresponding recording durations assigned.
  • the storage area 70a is assigned to the recording device 62a, the storage area 70b to the recording device 62b and the storage area 70c to the recording device 62c with the corresponding recording times.
  • the data of the recording device 62d need not be transferred to the recording device 66, since in the numerical example given above the data memory 64 has a sufficiently large recording capacity, that is to say that data of the required length of time are always stored in the data memory 64.
  • Data originating from the recording device 62c are transferred to the recording device 66 and stored there in the storage area 70b with the required recording duration (24 hours retrospectively from the current time). The same applies to the storage of the data which originate from the recording devices 62 and 62b.
  • the storage period that is to be assigned to a recording device 62a, 62b etc. can be set and can be set independently of the specific storage space in the data memory 68.
  • the transfer rate for repair data which is provided to the recording device 18 or 66 is greater than the transfer rate for current data.
  • Current data are those data which are transmitted to the recording device 18 or 66 without disturbing the digital network 16. This ensures that data gaps on the recording device 18 or 66 are quickly filled.
  • the transmission rate for repair data it is also possible for the transmission rate for repair data to be lower than the transmission rate for current data. This makes it possible to ensure, in particular with a predetermined bandwidth, that the influence on the transmission of current data is minimized by the additional transmission of repair data. For example, are a large amount of Repair data accumulated, then it is advantageous if a lower transmission rate for repair data to the recording device 18 or 66 is selected.
  • the transmission rate for repair data can be set.
  • the setting can be made at the data source or the recording device 18 or 66 (if this requires repair data). A flexible adaptation to the actual circumstances can be achieved in this way.
  • repair data It is also possible to queue up repair data to be transferred in a staggered manner. For example, the transmission rate for repair data can then be selected depending on the length of the queue. As an alternative or in addition, it is also possible to classify the repair data according to their priority, which is determined, for example, by the corresponding time stamps, in the queue and then to ensure the transmission to the recording device 18 or 66.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Library & Information Science (AREA)
  • Television Signal Processing For Recording (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

L'invention vise à mettre au point un procédé d'enregistrement de données qui ont été ou vont être produites en séquence temporelle au niveau d'une source de données et qui sont transmises par l'intermédiaire d'un réseau numérique à au moins un dispositif d'enregistrement, en vue d'une mémorisation. Ledit procédé d'enregistrement doit permettre d'enregistrer les données de manière fiable. A cet effet, il est prévu de mémoriser les données avant transmission sur le réseau numérique à la source de données, de manière qu'après un dérangement sur le réseau numérique, des données, prévues pour être transmises pendant la durée du dérangement, soient mises à disposition du dispositif d'enregistrement (au moins au nombre de un).
EP04701303A 2003-01-10 2004-01-10 Procede d'enregistrement fiable de donnees video/audio par l'intermediaire d'un reseau numerique Ceased EP1586194A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2003101457 DE10301457A1 (de) 2003-01-10 2003-01-10 Aufzeichnungsverfahren für Video-/Audiodaten
DE10301457 2003-01-10
PCT/EP2004/000114 WO2004064387A1 (fr) 2003-01-10 2004-01-10 Procede d'enregistrement fiable de donnees video/audio par l'intermediaire d'un reseau numerique

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EP1586194A1 true EP1586194A1 (fr) 2005-10-19

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EP (1) EP1586194A1 (fr)
CN (1) CN1736095B (fr)
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JP2008154143A (ja) * 2006-12-20 2008-07-03 Sony Corp 受信データ記録システム、受信機、受信機の制御方法、レコーダ、データ記録方法およびプログラム
DE102011003392A1 (de) 2011-01-31 2012-08-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Videoaufnahmesystem und Verfahren zur Videoaufnahme
DE202014009033U1 (de) 2014-11-11 2014-12-08 Imm Holding Gmbh Einrichtung zur Aufnahme, Übertragung und Wiedergabe von Audio- und Videodaten

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DE10301457A1 (de) 2004-07-29
CN1736095A (zh) 2006-02-15
WO2004064387A1 (fr) 2004-07-29

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