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WO2000038360A1 - Systeme et methode de surveillance d'audience television utilisant un boitier de convertisseur de canaux - Google Patents

Systeme et methode de surveillance d'audience television utilisant un boitier de convertisseur de canaux Download PDF

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Publication number
WO2000038360A1
WO2000038360A1 PCT/US1999/028429 US9928429W WO0038360A1 WO 2000038360 A1 WO2000038360 A1 WO 2000038360A1 US 9928429 W US9928429 W US 9928429W WO 0038360 A1 WO0038360 A1 WO 0038360A1
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WO
WIPO (PCT)
Prior art keywords
optical interface
channel
interface device
tuned
segment
Prior art date
Application number
PCT/US1999/028429
Other languages
English (en)
Inventor
Lester L. Jarrell
Original Assignee
Adcom Information Services, Inc.
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 Adcom Information Services, Inc. filed Critical Adcom Information Services, Inc.
Publication of WO2000038360A1 publication Critical patent/WO2000038360A1/fr

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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

Definitions

  • the present invention relates to a device for monitoring usage of audiovisual equipment.
  • the present invention relates to a device for interfacing with set-top converter boxes in a non-invasive manner in order to determine a channel being watched by a television viewer.
  • Determining a number of viewers watching a particular television program is of great importance to television networks, stations, programmers and advertisers.
  • Information regarding the number of viewers is used to determine market share and the ratings of particularprograms. This information is additionally used to determine advertising rates, which in turn affects the revenue generated by the television networks and stations.
  • U S Patent No 4,642,685 discloses a television monitoring system having a channel detection unit, a people monitoring unit, a transmission unit, and a receiving unit
  • the channel detection unit detects ultra or very high frequency radiation emitted from a television tuner to determine if the channel being tuned is one of the channels which have been preset into the detection unit
  • the detection is performed by a pick-up probe that inductively couples the signal emitted from the local oscillator of the television receiver
  • the people monitor unit is a powered handset that includes buttons assigned to each of the individuals who will be viewing the television set
  • the viewer depresses his or her assigned button to indicate he or she has started to watch the television
  • the viewing data is stored and transmitted by the transmission unit over household wiring to the receiving unit
  • the receiving unit sends the collected information to a central computer via a telephone connection While this system speeds the data transmission process to the central computer as compared to mailing diaries
  • U S Patent No 4,907,079, to Tuner et al describes networked conventional audio and visual equipment that communicate via telephone lines with a remote central computer
  • the viewer provides channel selection commands or other programming commands to a microprocessor through an infrared remote control
  • a VCR tuner and TV tuner within the system provide audio and video signals for the conventional television monitor or television receiver
  • An AM and FM radio tuner may also be included, tunable by the microprocessor
  • the video and/or audio signals from each tuner, video tape player, and disc players are coupled to the input side of an audio switch and a video switch
  • the switches are microprocessor controlled so that the audio and video program - j - from any source may be coupled to any output or display device at the viewing location.
  • the system includes a motion detector to determine the presence of viewers and provides for communication with a remote computer to monitor use of each networked audiovisual unit. While this system provides for monitoring and logging of each networked audiovisual unit, the Tuner et al. system is designed to control a large home-entertainment system, rather than a small-scale solution to monitoring viewers' habits. In particular, the Turner et al. system is indicated to cost a few hundred dollars, and would fail to provide a solution to television networks and advertisers who are interested in obtaining accurate viewing statistics by deploying systems to a relatively large number of viewers.
  • 5,374,951 discloses a system for monitoring and recording data related to television program viewing habits that includes a plurality of remote program monitor units that automatically report such data to a central computer via a conventional telephone network.
  • the monitor unit reads a character string that is decoded from the demodulated television signal received by the unit.
  • the character string is compared to a string table stored within the unit to determine the content being viewed by the television watcher. If there is a match, an event code and a time are stored in the unit for reporting to the central computer.
  • the character string must be encoded into the received television signal, otherwise there will be no match with the string table stored in memory. Further, the string table must be kept current for the system to provide accurate results.
  • the personal data collection devices includes a detector for providing a station identifier identifying the particular broadcast signal being received by the receiver, a clock for providing a signal representing time, a memory for storing data, and a cellular telephone module for communicating with a central location.
  • the cellular telephone module periodically transmits stored data within the device to the central location.
  • the viewer may enter channel information directly into the device, or the device may include a detector for detecting a channel selection signal from a television remote control to change the station identifier stored in memory.
  • this system requires a personal data collection device for each individual watching a particular television set. Further, because the device is physically separate from the television set, the data collected may not be accurate as viewers may either fail to enter channel information or the device may not detect an infrared transmission from the television remote control.
  • U.S. Patent No. 5,495,282 discloses a tuning/monitoring module for monitoring use of a video equipment without the use of probes by injecting RF signals into a cable converter and a NCR in order to detect channels selected by the cable converter and the NCR.
  • the tuning/monitoring module can determine a selected channel being viewed by the viewers.
  • Channel identification signals are also injected into the NCR and cable converter for recording by the NCR on videotape.
  • the state of the "TV/NCR" switch of the NCR is determined by injecting a code signal into the VCR and determining whether that signal is present in an RF video signal output by the NCR.
  • the receiver also receives data contained in channel identification signals.
  • the receiver is selectively connectable to the NCR and the cable converter.
  • this system requires the use of the special tuning/monitoring module in place of a tuner provided with a television or VCR in order to provided the injected signal to determine the viewed channel.
  • Such a special tuning/monitoring module increases the expense associated with tracking viewers' habits.
  • an optical interface device for use in determining a currently tuned-to channel of a set-top converter box having an electronic display
  • the optical interface device includes a plurality of light receiving elements that are adapted to receive light emitted by the electronic display, and a controller that is connected to the light receiving elements and which receives signals from the light receiving elements indicative of whether the light receiving elements are receiving light from the electronic display
  • the controller scans the electronic display and receives the signals to generate information representative of the currently tuned-to tuned channel
  • the electronic display includes a plurality of seven-segment elements that are each adapted to display an alphanumeric character that includes the currently tuned-to channel of the set-top converter box, and the light receiving elements are arranged in a pattern that corresponds to segments of the seven- segment elements Each of the light receiving elements is arranged to receive light from one segment of each seven-segment display element
  • the controller scans each of the plurality of seven-segment elements at a predetermined frequency
  • the signals from the light receiving elements are input to predetermined pins of an input/output port of the controller in order to determine the alphanumeric character, and upon scanning each of the seven- segment elements of the electronic display, the controller determines the information representative of the currently tuned-to tuned channel
  • the information representative of the tuned channel includes an ASCII value representative of the currently tuned-to channel, and the controller outputs the ASCII value to a viewership meter connected to the optical interface via an electrical connection
  • the viewership meter includes an audio matching circuit that compares a first audio signal of a predetermined channel tuned by the viewership collection meter with a second audio signal output by a television to which the set- top converter is connected If the first audio signal and the second audio signal match, the viewership collection meter determines that the channel to which the set-top converter box is tuned is the predetermined channel
  • the light receiving elements comprise phototransistors and the electronic display includes seven-segment elements, the phototransistors are turned ON and OFF in response to receiving incident light from the seven-segment elements, and the signals comprise one of a logic high and a logic low state
  • the optical interface device is adapted to be mounted to the electronic display such that each of the phototransistors are arranged to receive light from one segment of each seven-segment display element
  • the seven-segment elements comprise LED display elements
  • the optical interface device is adapted to receive power and additional data via the second electrical connection
  • a system for determining viewership of channels tunable by a set-top converter box having an electronic display includes an optical interface device which receives light emitted from the electronic display and a viewership collection meter connected to the optical interface device, the viewership meter periodically storing a channel to which the set-top converter is tuned The channel to which the set-top converter is tuned is determined by the optical interface device and communicated to the viewership collection meter, and the viewership collection meter stores the channel and forwards it to a predetermined location at selected times
  • the viewership collection meter further includes an audio matching circuit that compares a first audio signal of a predetermined channel tuned by the viewership collection meter with a second audio signal output by a television to which the set-top converter is connected If the first audio signal and the second audio signal match, the viewership collection meter determines that the channel to which the set-top converter box is tuned is the predetermined channel
  • the optical interface device includes phototransistors and the electronic display includes seven-segment elements
  • the phototransistors are turned ON and OFF in response to incident light from the seven-segment elements, and the phototransistors output signals that comprise one of a logic high and a logic low state to indicate the presence or absence of incident light
  • the optical interface device is adapted to be mounted to the electronic display such that each of the phototransistors are arranged to receive light from one segment of each seven-segment display element
  • the seven-segment elements may comprise LED display elements
  • a method of determining a channel to which a set-top converter box is tuned using a optical interface includes receiving light for the electronic display at the optical interface, outputting signals from the optical interface representative of received light, determining a channel to which the set-top converter box is tuned by sampling the signals, generating a coded representation of the determined channel, and outputting the coded representation
  • the electronic display includes at least one seven-segment display element
  • the step of determining a channel to which the set-top converter box is tuned further includes (a) determining which segments of the seven-segment display element is illuminated, (b) determining a character being displayed by the seven- segment display element, and (c) repeating steps (a) and (b) for each seven-segment display element in the electronic display
  • the step of generating a coded representation of the determined channel includes generating an ASCII value of the channel to which the set-top converter box is tuned
  • the step of outputting the coded representation may comprise serially transmitting the ASCII value to a viewership meter
  • the method further includes storing, at the viewership meter, the ASCII value and forwarding the ASCII value at predetermined times to a central collection site
  • Figure 1 is an overview of the environment in which the television audience monitoring system of the present invention may be implemented
  • Figure 2 is a block diagram illustrating an optical interface device in accordance with the present invention coupled to a television set-top converter box
  • Figure 3 is a schematic diagram illustrating the optical interface device of the present invention in greater detail
  • FIG. 4 is a block diagram of an exemplary collection meter in accordance with an aspect of the present invention.
  • Figure 5 is an exemplary flow chart illustrating the steps and processes performed by a microcontroller provided with the optical interface device
  • the present invention provides a method and apparatus for detecting the currently tuned-to channel of a subscriber's set-top converter box hav gan electronic display that indicates the channel and status
  • the information related to the detected channel may then be forwarded to a data collection system within the subscriber's home or other location for eventual transmission to a central data collection and compilation site
  • Such information taken from a large sample size, may be used to measure network viewing and the interactive environment
  • each of the homes to be sampled may be supplied with a viewership meter (described below)
  • the viewership meter is preferably supplied by ADcom Information Services, Ine , Carlsbad, California, and is installed on each television in the sampled homes Such a meter is quickly and easily installed as compared to other known meters and provides a complete record of viewing in each participating household
  • the information may beused by advertisers and network programmers to accurately target audiences and determine ideal spot placement for advertisements
  • a first 75 ⁇ co-axial cable 14 electrically connects the transmission line 11 , at the wall plate 12, to a first connection on, e g , the rear panel of a set-top converter box 16
  • a second 75 ⁇ co-axial cable 14 connects between a second connection on the rear panel of the set-top converter 16 and to, e g , a 75 ⁇ connector in a television set 10
  • the set-top converter box 16 is used to selectively tune channels in accordance with a viewer selection
  • a single 75 ⁇ co-axial cable 14 may be used to provide signals directly to the television set 10
  • the television set includes an audio-out jack 10a
  • the set-top converter 16 is connected to a viewership collection meter 18 by wires or a cable 24 Alternatively, an electrical connector or the like may be used in place of wires or cabling 24 to connect the viewership meter 18 and the set-top converter 16
  • the viewership meter 18 is designed such that it may connect to any television 10 or set-
  • the exemplary optical interface device 22 includes a microcontroller U7, a connector J4, and a plurality of phototransistors Q3-Q23 which receive a biasing voltage from a voltage source VCC via a resistor network comprising resistors R2-R7
  • the microcontroller U7 is preferably an 8-bit microcontroller having a Reduced Instruction Set Computer (RISC) architecture and includes dedicated digital input lines, digital output lines, and an on-board programmable memory
  • the microcontroller U7 may also provide capabilities such as a real-time clock and a modem chip-set
  • the microcontroller U7 comprises aAT90S1200, manufactured by Atmel Corporation, San Jose, California Other similar microcontrollers may beused, as the present invention is not limited to the above-noted microcontroller
  • the microcontroller U7 receives voltages (via the input/output ports) over input lines 25 that are representative of the channel
  • the optical interface device 22 preferably comprises a printed circuit board, such that the phototransistors Q3-Q23 may be located in close proximity to respective segments of the seven-segment elements 23a-c when the optical interface device 22 is mounted to the display 16a
  • the phototransistors Q3-Q23 are arranged on the printed circuit board in a pattern that corresponds to the seven-segment elements 23a-c
  • the phototransistors Q3-Q23 are preferably positioned to maximize the viewing area of their respective segments and minimize the interference with each other
  • the printed circuit board defines cut-out regions such that the seven-segment elements 23a-c are visible to the television viewer when the optical interface device is mounted thereto
  • the printed circuit board may be fabricated from an optically clear material The operation of the optical interface device 22 will now be described When the segments of the seven-segment elements 23a-c of the display 16a are illuminated to indicate a channel to which the set-top converter box 16 is tuned, corresponding ones of the phototransis
  • each of the phototransistors Q3-Q23 is connected to a lead that is connected to one of microcontroller port I/O port pins PB5-PB7.
  • a voltage from voltage source VCC as dropped by resistors R2-R7, is presented to the collector of each of phototransistors Q3-Q23 and pins PDO, PD1, PD2, PD3, PD4, PD5 and PB1 of the microcontroller U7 via lines 25.
  • the voltage is utilized by the microcontroller U7 as a logic high value, as described below.
  • the controller U7 scans each of the seven-segment elements 23a-c at a predetermined frequency. This scanning is performed by pulling one of I/O port pins PB5- PB7 low to select the phototransistors that correspond to the seven-segment element 23 to be scanned.
  • a segment of a seven-segment element 23a-c is illuminated, its corresponding phototransistor on the optical interface device 22 will be turned ON.
  • the seven-segment element 23 a, 23b or 23c is selected to be scanned (i.e., by pulling I/O port pin PB7, PB6 or PB5 low, respectively), a current path from VCC to the pulled-low pin PB5, PB6 or PB7 is completed.
  • the voltage presented to its corresponding pin of the I/O port pins (e.g., pins PDO, PD1, PD2, PD3, PD4, PD5 or PB 1) is at a logic low level, whereas, if the phototransistor is not receiving light (i.e., turned OFF) the voltage at the I/O port pin is at the logic high level.
  • the microcontroller U7 can determine which segments are illuminated for a particular seven- segment display element 23a, 23b or 23 c, and, accordingly, can determine the particular number (or letter) being displayed by that seven-segment display element 23a, 23b or 23c.
  • the channel number displayed by the set-top converter box 16 may be determined. The determined channel number may then be converted to, e.g., an ASCII value or other format, and output to the viewership collection meter 18 for further processing
  • FIG. 4 is a block diagram of the exemplary components withm the collection meter 18
  • the collection meter 18 generates "snapshots" of selected channels on cable, satellite and standard air systems and compiles information related to the snapshots
  • the information may include the channel or channels viewed at a particular time or on a particular day
  • the complied information may be used to generate viewership ratings and other researchrelatedservicesformulti-channel subsc ⁇ bertelevision systems (e g , cable television and satellite television)
  • the collection meter 18 includes Audio interface devices 32, a communications module 26, a digital signal processor (DSP) controller 27, a flash memory 28 to store parameters and programming information for the DSP controller 27, a CODEC 30 to provide for compression and decompression of data (e g , audio or video information) in accordance with predetermined mathematical algorithms, a real time clock 30, and a power supply and voltage supervisor 31
  • the DSP controller 27 may be programmed to provide functionalities such as, tuning to cable channel frequencies, detection of the state of the television (e g , powered ON or OFF), detection of the channel being viewed, communication to the communications module 26, management of storage of snapshot information (e g , t ⁇ me stamp), reception and storage of information related to a telephone number of a central collection site and time for sending snapshot information to the central site, dial-up capability to contact the central site and to upload the snapshot information, and a capability to receive time and reset the onboard real time clock during the upload Additional features and functionalities may be provided as user requirements change by reprogramming the DSP controller 27
  • the dial-up capability is preferably programmed in firmware within the DSP controller 27 and is preferably not programmable by end-users (e g , viewers)
  • the communications module 27 which is connected to the customer's telephone line, is taken off-hook in accordance with the V 22 protocol at predetermined times and dual-tone multi-frequency (DTMF) signals are transmitted to call the central collection site
  • DTMF dual-tone multi-frequency
  • the telephone number of the central collection site is preferably coded into the firmware and may be changed by the central site during data communications Using the V 22 protocol, the communications module 27 transmits signals representative of the data collected by the collection meter 18 to the central site
  • the communications module 27 may comprise a MODEM
  • the power supply 31 regulates the voltage to the communications module 27 and the Audio interface devices 32
  • the power supply 31 receives, for example, 12V AC and may provide, ⁇ 5V and ⁇ 12N DC to the modules 27 and 32
  • the voltage supervisor portion monitors the +5N and +12N and resets the DSP controller 26 and the flash memory 28 if the supplied voltage drops below these values
  • the total power consumption is preferably less than 5 Watts
  • the audio interface devices 32 include an RF amplifier 33, a mixer 34, an FM demodulator 35, a low-pass filter 36, audio comparator 37, voltage controlled oscillator (NCO) 38, and a frequency synthesizer 39
  • the broad-band cable signal to the television set 10 enters through a coaxial cable 14 coupled to the Audio interface devices 32
  • the audio sub-carrier of a particular cable channel is coupled to the low pass filter 36 and the RF amplifier 33 by a low-loss coupler
  • the signal is converted to a predetermined frequency (e g , 3 25 MHz) by the mixer 34, the local oscillator 38 and the frequency synthesizer 39, which is controlled by the DSP controller 27
  • the predetermined frequency is demodulated by the FM demodulator 35 so the audio program for a tuned channel may be recovered
  • the audio signal from the television set 10 is obtained from an audio pick-up device (not shown) or from the audio jack 10a in the television set 10
  • the audio pick-up device is coupled to the television set
  • the recovered audio from the FM demodulator 35 is also fed into the audio comparator 37 and compared with the television audio signal. If the audio frequencies match, then a logic high signal is sent by the audio comparator 37 to the DSP controller 27. If there is not a match between the recovered audio from the FM demodulator 35 and the television audio, then the DSP controller 27 tunes the frequency synthesizer 39 to the next channel and continues until a match is found.
  • the collection meter 18 may be enclosed in an assembly (not shown) that includes internal-metalized plastic covers.
  • the Audio interface devices 32 may be mounted on the bottom cover and the communication module 27 mounted up-side-down on the top of the Audio interface devices 32.
  • the optical interface devices 22 may be mounted on the top cover.
  • the assembly may include the following interfaces: a 75 ⁇ cable in (54 MHz to 1 GHz, -16dBmN to +10 dBmN), a power adapter in (12 VAC, ⁇ 420mA), audio in (1 V guest, 100 Hz to 5kHz, >lk ⁇ impedance), a magnetic sensor in (5mV Pi consider 100 Hz to 5 kHz, lk ⁇ impedance), a POTS In/Out (RJ-11, meets FCC Part 68 requirements), and a power/mode indicator (green LED).
  • the collection meter 18 may include a microprocessor or microcontroller and associated circuitry to perform the various functions of the DSP controller 27.
  • additional or fewer communications interfaces may be provided (e.g., power line data communication, RF data communication, or digital telephony).
  • the set- top converter box 16 may be modified to include the components of the collection meter 18, such that a single set-top device performs the functions of both devices.
  • FIG. 5 is a exemplary flowchart of the sequence of operations performed by the microcontroller U7 in accordance with an aspect of the invention.
  • the variables, data space and serial ports are initialized.
  • the microcontroller I/O ports are initialized and set.
  • Port B and Port D In the Atmel AT90S 1200, two I/O ports are provided (Port B and Port D) having 8 and 7-bit widths, respectively As noted in step 102 and illustrated in Figure 3, bits 5-7 of Port B are set to scan the LED display 23, and bit lof Port B and bits 0-5 of Port D are set to receive the segment lines of the LED display 23 Bit 0 of Port B and bit 6 of Port D are set to output serial data to connector J4 Steps 100 and 102 are typically executed at power-up or during a reset operation
  • step 104 pm 7 of port B is pulled low such that segment data from character 1 (l e , the first LED display 23 a) may be received
  • step 106 the segment data for character 1 is captured and stored in memory in the microcontroller U7
  • step 108 pm 6 of port B is pulled low such that segment data from character 2 (I e , the second LED display 23b) may be received
  • step 110 the segment data for character 2 is captured and stored in memory in the microcontroller U7
  • step 1 12 pin 5 of port B is pulled low such that segment data from character 3 (l e , the third LED display 23 c) may be received
  • step 114 the segment data for character 3 is captured and stored in memory in the microcontroller U7
  • step 116 the channel information captured at steps 106, 110 and 114 is converted into ASCII and serially transmitted to the collection meter 18 at a predetermined data rate After the transmission is complete at step 118, the process returns to step 104
  • the present invention provides for a novel apparatus and method for capturing information related to the channel to which a set-top converter box is tuned and for converting the information into data having a format compatible with a viewership data collection meter

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

Cette invention a trait à un dispositif d'interfaçage optique et à la méthode correspondante, permettant de déterminer le canal sur lequel est réglé ponctuellement un boîtier pourvu d'un affichage électronique, indiquant le canal sur lequel il est réglé par l'intermédiaire d'éléments à sept segments. Ce dispositif d'interfaçage comprend plusieurs phototransistors, chacun étant couplé optiquement à des segments individuels des éléments à sept segments. Ce dispositif comprend également une unité de commande recevant des signaux provenant des phototransistors et produisant une information représentative du canal sur lequel le boîtier est réglé ponctuellement, laquelle information est destinée à être utilisée par des composants en aval. L'information représentative du canal sur lequel le boîtier est réglé ponctuellement peut être produite sous forme de valeur ASCII représentative dudit canal. L'interface optique peut faire partie d'un système de mesure de l'effectif-téléspectateurs lorsqu'elle est utilisée conjointement avec une unité de recensement d'effectif-téléspectateurs, pour la détermination des habitudes des téléspectateurs.
PCT/US1999/028429 1998-12-21 1999-12-01 Systeme et methode de surveillance d'audience television utilisant un boitier de convertisseur de canaux WO2000038360A1 (fr)

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US21764398A 1998-12-21 1998-12-21
US09/217,643 1998-12-21

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US7779435B2 (en) 2004-04-26 2010-08-17 The Nielsen Company (Us), Llc Methods and apparatus to export tuning data collected in a receiving device
US9015743B2 (en) 2004-08-09 2015-04-21 The Nielsen Company (Us), Llc Methods and apparatus to monitor audio/visual content from various sources
US9027043B2 (en) 2003-09-25 2015-05-05 The Nielsen Company (Us), Llc Methods and apparatus to detect an operating state of a display
US9294813B2 (en) 2008-10-31 2016-03-22 The Nielsen Company (Us), Llc Probabilistic methods and apparatus to determine the state of a media device
US9312973B2 (en) 2008-09-30 2016-04-12 The Nielsen Company (Us), Llc Methods and apparatus for determining whether a media presentation device is in an on state or an off state using fuzzy scores and signature matches
US9420334B2 (en) 2005-08-16 2016-08-16 The Nielsen Company (Us), Llc Display device on/off detection methods and apparatus
US9692535B2 (en) 2012-02-20 2017-06-27 The Nielsen Company (Us), Llc Methods and apparatus for automatic TV on/off detection
US9832496B2 (en) 2011-12-19 2017-11-28 The Nielsen Company (Us), Llc Methods and apparatus for crediting a media presentation device
US9924224B2 (en) 2015-04-03 2018-03-20 The Nielsen Company (Us), Llc Methods and apparatus to determine a state of a media presentation device

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EP0763950A1 (fr) * 1995-09-15 1997-03-19 Ted E. Hartson Sonde électrostatique pour détection du signal émis par un dispositif d'affichage à tube cathodique

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EP0127068A2 (fr) * 1983-05-25 1984-12-05 TeleMetric Internationale Gesellschaft für Fernsehzuschauerforschung Appareil pour la saisie de données concernant les habitudes des téléspectateurs pour l'allumage de téléviseurs
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