EP2592770A1 - Device for a non-intrusive detection of a recording operational mode status of a video cassette recorder - Google Patents

Device for a non-intrusive detection of a recording operational mode status of a video cassette recorder Download PDF

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Publication number
EP2592770A1
EP2592770A1 EP11468005.1A EP11468005A EP2592770A1 EP 2592770 A1 EP2592770 A1 EP 2592770A1 EP 11468005 A EP11468005 A EP 11468005A EP 2592770 A1 EP2592770 A1 EP 2592770A1
Authority
EP
European Patent Office
Prior art keywords
frequency
video cassette
low
cassette recorder
recorder
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.)
Withdrawn
Application number
EP11468005.1A
Other languages
German (de)
English (en)
French (fr)
Inventor
Marko Pervinsek
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.)
Nielsen Lab doo
Original Assignee
Agb Lab doo
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 Agb Lab doo filed Critical Agb Lab doo
Publication of EP2592770A1 publication Critical patent/EP2592770A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/29—Arrangements for monitoring broadcast services or broadcast-related services
    • H04H60/32—Arrangements for monitoring conditions of receiving stations, e.g. malfunction or breakdown of receiving stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/27—Arrangements for recording or accumulating broadcast information or broadcast-related information

Definitions

  • the invention relates to a device for a non-intrusive detection of a recording operational mode status of a video cassette recorder whereat the device comprises an inductive sensor sensing a magnetic field radiated by an erase head in the recording operational mode status of said video cassette recorder.
  • the proposed device is layed out as part of a telemetric system for monitoring television rating in households.
  • Said device as part of a telemetric system for monitoring television rating in households makes it possible to detect the recording operational mode status of a video cassette recorder, i. e. of a recorder recording video images on a magnetic tape.
  • the erase head In order to erase the magnetic tape the erase head generates an alternating magnetic field, which is also detected in the vicinity of the erase head as a strong magnetic signal with a frequency ranging from 30 kHz to 100 kHz, said frequency varying in video cassette recorders produced by various manufacturers. All video cassette recorders are provided with a plastic back-panel, which does not shield off the magnetic field.
  • Said device detects whether the video cassette recorder is in the recording operational mode status by determining whether a strong alternating magnetic field is present in the vicinity of its erase head. Said detection is carried out in a non-intrusive way since there is no need for said device to intrude into the video cassette recorder; the device does not need to be connected to the video cassette recorder.
  • a device for detecting an operational mode status of a video cassette recorder is known ( US 5.165.069 ).
  • a sensor of said device detects a magnetic signal radiated by a recorder erase head when erasing the magnetic tape.
  • a sensor probe tuned to a frequency of 70 kHz is placed in the vicinity of the video cassette recorder.
  • An amplified and digitized detected signal is processed in a microprocessor.
  • the device is adapted to the video cassette recorder of a specific type. A person installing such devices must therefore be supplied with various sensor probes for the work in the field, as he comes across video cassette recorders of various manufacturers.
  • the technical problem of the invention is to propose such device for a non-intrusive detection of a recording operational mode status of a video cassette recorder that prior to digitalization an output signal of the proposed device will be within an intended low-frequency band, irrespective of the frequency spectrum of the magnetic field of an erase head within the video cassette recorder of an arbitrary type possessed by television viewers, and a sensor sensing said radiated magnetic field should be mounted in a simple way with respect to said erase head.
  • the device of the invention for a non-intrusive detection of a recording operational mode status of a video cassette recorder represents a rather inexpensive technical solution applicable to a video cassette recorder of any type possessed by television viewers.
  • the output signal favourably lies within a low-frequency band whereby sensitivity to environmental electromagnetic interferences is reduced.
  • a device sensor for sensing an alternating magnetic field is mounted onto an outer surface of a recorder back-panel quickly, aesthetically and in a simple way.
  • the device of the invention for a non-intrusive detection of a recording operational mode status of a video cassette recorder is a component of a meter device MD for telemetric monitoring of television rating.
  • An inductive sensor Co which senses an alternating magnetic field radiated by its erase head in operation, is connected to an amplifier A in a known way ( Fig. 1 ).
  • the inductive sensor is a coil Co.
  • the coil Co having an inductance of 3.5 mH is made as a flat coil with a diameter of 22 mm and a height of 1 mm with 700 turns. It is provided with a resistor having a resistance of 16 k ⁇ to reduce the influence of the parasitic capacitance of a connecting cable.
  • An output of said amplifier A is connected to a first input of a mixing circuit MC.
  • An output of a signal generator SG is connected to a second input of the mixing circuit MC. From the mixing circuit MC there exits a signal fdss, a frequency spectrum of which signal comprises a difference and a sum of the frequencies of the signals at the inputs of the mixing circuit MC.
  • Frequency fg of an output signal gs from the signal generator SG is adjusted in a way that the frequency df of the output signal fdss from the mixing circuit MC, which frequency equals a difference of the frequencies of the signals at the inputs of the mixing circuit MC, is within a low-frequency pass band of the low-pass filter LPF.
  • the output signal fdss is resistant to environmental electromagnetic interferences, as only a narrow frequency band around the frequency of the alternating magnetic field radiated by the erase head of the video cassette recorder is comprised each time.
  • a peak-frequency fp of said low frequency pass band of the low-pass filter LPF equals 1 kHz, whereas its upper and lower edge frequencies are 2 kHz and 0,39 kHz, respectively.
  • Frequency fg of the output signal gs from the signal generator SG is adjustable in steps of 0.414 kHz within a frequency range from 13 kHz to 119 kHz.
  • frequency fg of the output signal gs from the signal generator SG is adjusted in the relevant video cassette recorder in a way that said frequency df, which equals the difference of the frequencies of the signals at the inputs of the mixing circuit MC, of the signal fdss at the output of the mixing circuit MC equals 1 kHz.
  • the output of the mixing circuit MC is connected through a low-pass filter LPF to a circuit for further conditioning of the signal.
  • a filtered output signal dfos with a frequency within said low-frequency band is first digitized and then processed in said circuit of a larger meter device MD for telemetric monitoring of television rating.
  • the coil Co is mounted on the video cassette recorder by sticking onto an outer surface of a recorder back-panel close to said recorder erase head.
  • the back-panel of all known video cassette recorders is made of plastic.
  • the device for a non-intrusive detection of the recording operational mode status of the video cassette recorder is adjusted as follows.
  • the video cassette recorder is run in the recording operational mode.
  • the coil Co is placed close to the recorder erase head. Frequency fg of the output signal gs from the signal generator SG is varied in order to find out the highest response frequency. If the magnetic field generated by the erase head is rather weak, a cassette compartment lid is lifted and the coil Co is put close to the erase head in order to determine the frequency of the alternating magnetic field generated by the erase head.
  • the output signal cs of the coil Co is amplified that much that the amplified signal acs is appropriate for further conditioning. Finally, the coil Co is glued onto the outer surface of the back-panel of the video cassette recorder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
EP11468005.1A 2011-11-09 2011-11-10 Device for a non-intrusive detection of a recording operational mode status of a video cassette recorder Withdrawn EP2592770A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SI201100424A SI23944A (sl) 2011-11-09 2011-11-09 Priprava za nevdorno zaznavanje stanja snemalnega načina pri videokasetnem snemalniku

Publications (1)

Publication Number Publication Date
EP2592770A1 true EP2592770A1 (en) 2013-05-15

Family

ID=45443018

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11468005.1A Withdrawn EP2592770A1 (en) 2011-11-09 2011-11-10 Device for a non-intrusive detection of a recording operational mode status of a video cassette recorder

Country Status (2)

Country Link
EP (1) EP2592770A1 (sl)
SI (1) SI23944A (sl)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180111A (en) * 1985-09-03 1987-03-18 Video Res System for detecting recording data of video tape recorder
US5165069A (en) 1990-07-30 1992-11-17 A. C. Nielsen Company Method and system for non-invasively identifying the operational status of a VCR
WO1994010799A1 (en) * 1992-11-03 1994-05-11 The Arbitron Company Monitoring system for tv, cable and vcr

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180111A (en) * 1985-09-03 1987-03-18 Video Res System for detecting recording data of video tape recorder
US5165069A (en) 1990-07-30 1992-11-17 A. C. Nielsen Company Method and system for non-invasively identifying the operational status of a VCR
WO1994010799A1 (en) * 1992-11-03 1994-05-11 The Arbitron Company Monitoring system for tv, cable and vcr

Also Published As

Publication number Publication date
SI23944A (sl) 2013-05-31

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