FR2555383A1 - Device for automatic monitoring of radio or television receivers for the purposes of audience statistics studies of various transmitter stations - Google Patents

Device for automatic monitoring of radio or television receivers for the purposes of audience statistics studies of various transmitter stations Download PDF

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Publication number
FR2555383A1
FR2555383A1 FR8318621A FR8318621A FR2555383A1 FR 2555383 A1 FR2555383 A1 FR 2555383A1 FR 8318621 A FR8318621 A FR 8318621A FR 8318621 A FR8318621 A FR 8318621A FR 2555383 A1 FR2555383 A1 FR 2555383A1
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Prior art keywords
receiver
device
sound
characterized
device according
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FR8318621A
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French (fr)
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BARRAULT CHRISTIAN
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BARRAULT CHRISTIAN
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Priority to FR8318621A priority Critical patent/FR2555383A1/en
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Application status is Withdrawn legal-status Critical

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H60/00Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/56Arrangements characterised by components specially adapted for monitoring, identification or recognition covered by groups H04H60/29-H04H60/54
    • H04H60/58Arrangements characterised by components specially adapted for monitoring, identification or recognition covered by groups H04H60/29-H04H60/54 of audio
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H60/00Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/38Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space
    • H04H60/40Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast time
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H60/00Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/38Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space
    • H04H60/41Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas
    • H04H60/44Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas for identifying broadcast stations

Abstract

The invention relates to a logic electronic arrangement intended to identify, by sound recognition, the radio or television station picked up by a receiver. It consists of a pick-up 1 and 2 for the sound emitted by the monitored receiver, a built-in receiver controlled by the device and serving as reference 3 and 4, a microprocessor with its associated logic 5 and 6 enabling a statistical comparison to be made of the two sources so as to determine their possible identity, a dating-clock 7 making it possible to date precisely the result of the test and a control for locking the receiver onto a preset transmitter 8 in order to initialise the process. The arrangement according to the invention is particularly intended for the automatic monitoring of radio or television receivers for the purposes of audience statistics studies. <IMAGE>

Description

La présente invention concerne un dispositif de surveillance automatique de récepteurs radio ou télévision à fin d'études statistiques d'audience des différentes stations émettrices The invention relates to an automatic monitoring system of radio or television receivers end of statistical studies of hearing different transmitting stations
Cette surveillance est actuellement effectuée par deux moyens différents - Un moyen manuel consistant en une étude des déclarations quotidiennes d'un certain nombre d'auditeurs , déclarations faites sur imprimés spéciaux recueillis par voie postale ou oralement à des enquêteurs les interrogeant par téléphone - Un moyen automatique consistant en un appareil branché en permanence directement à l'intérieur du poste récepteur à surveiller This monitoring is currently performed by two different means - A manual means consisting of a study of daily statements from a number of listeners statements made on special forms received by mail or orally to investigators interviewing by phone - a way Automatic consisting of a permanently connected unit directly inside the receiving station to monitor
Ces deux méthodes nécessitent soit un délai de réponse long et peu fiable soit une mise en place difficile et très onéreuse Both methods require either a long response time, unreliable or difficult setting and very expensive
Le montage selon l'invention permet d'obtenir un dispositif remédiant à ces inconvénients . The assembly according to the invention provides a device remedying these drawbacks. I1 permet en effet , comme le second moyen , un relevé immédiat de l'information cherchée mais il ne nécessite aucun montage préalable interne au poste surveillé donc aucune manipulation requérant l'intervention d'un spécialiste en électronique I1 makes it possible, as the second means, an immediate statement of the information sought but requires no prior internal mounting position so secure any applicant handling the intervention of an electronics specialist
Le montage selon l'invention reçoit le son diffusé par le récepteur à surveiller et le compare , selon des méthodes statistiques , au son d'une station connue reçue par un récepteur incorporé à l'appareil .Différents essais faits avec différentes stations de référence permettent de connaitre la station recule par le récepteur surveillé The assembly according to the invention receives the sound from the receiver to monitor and compare, using statistical methods, to the sound of a known station received by a receiver built into the device .Différents tests made with different reference stations allow to know the station back through the monitored receiver
La figure 1 représente un schéma synoptique du dispositif selon l'invention 1 shows a block diagram of the device according to the invention
La figure 2 représente un schéma détaillé des parties (2) et (4) du schéma général 2 shows a detailed diagram of the parts (2) and (4) of the general schema
La figure 3 représente un schéma détaillé de la partie (5) du schéma général Figure 3 shows a detailed diagram of the part (5) of the general scheme
La figure 4 représente une variante particulière des parties (1) et (2) du schéma général 4 shows a particular variant of the parts (1) and (2) the general outline
Le dispositif représenté à la figure 1 se compose de 3 parties principales The device shown in Figure 1 consists of 3 main parts
- Le captage (1) et la mise en forme 12) du son provenant du récepteur à surveiller - Capture (1) and 12 formatting) of the sound from the receiver to monitor
- Le pilotage (6) d'un récepteur (3) et la mise en forme (4) du son qui en provient - Control (6) a receiver (3) and the shaping (4) of the sound that comes from
- La comparaison (5) des deux émissions reçues par l'intermédiaire des 2 parties précédentes et l'identification de la station captée par le récepteur surveillé . - comparison (5) of the two programs received via the two preceding parts and identification of the station detected by the monitored receiver.

Deux fonctions supplémentaires sont adjointes : Two additional functions are adjoint:
- Une horloge (7) permettant de dater les identifications faites , donc de reconstituer la séquence d'écoute du récepteur surveillé - a clock (7) for dating identifications so listening to reconstruct the sequence of the monitored receiver
- Une commande d'auto étalonnage de l'appareil (8) permettant de compenser les différences de temps entre les parties (1) et (2) d'une part et (3) (4) (6) d'autre part dans la captation et l'acheminement du son - A self calibration of the device command (8) to compensate for time differences between the parts (1) and (2) on one hand and (3) (4) (6) on the other hand in uptake and delivery of its
La figure 2 montre le schéma typique du montage réalisé dans les parties (2) et (4) du schéma général qui doivent être identiques .I1 se compose d'un filtrage passe-bande 80 - 4000 Hz(10) et d'un convertisseur analogique numérique (11) Figure 2 shows the typical pattern of the montage in parts (2) and (4) of the general scheme which must be identical .I1 consists of a band-pass filtering 80-4000 Hz (10) and converter analog to digital (11)
Le son entre sous forme d'une variation de tension non périodique au point(9). The sound between the form of a non-periodic variation of voltage at the point (9). Le but de cette partie du montage est de fournir , à un instant donne , une valeur numérique représentant l'amplitude de la tension observée en(3). The aim of this part of the assembly is to provide, at a given instant, a digital value representing the amplitude of the voltage observed in (3).

Les 2 numérisations effectuées dans les parties (2) et (4) du schéma général doivent être simultanées . 2 scans performed in parts (2) and (4) the general scheme should be simultaneous. La commande de conversion (14) sera donc commune pour les 2 sousensembles . The conversion of control (14) will be common for the two subsets. La conversion étant déclenchée , la grandeur analogique (9) filtrée en (10) pour éviter les fréquences basses parasites et les fréquences d'écho supérieures à 4000 Hz va être échantillonnée puis numérisée en (11) . The conversion being triggered, the analog quantity (9) filtered (10) to prevent low frequency noise and the higher frequency echo to 4000 Hz will be sampled and digitized (11). Le temps d'échantillonnage de quelques nano-secondes , en regard de la fréquence maximale retenue pour l'étude (4000 Hz) nous garantit une transformation d'une tension (9) ponctuelle .La valeur numérique binaire (12) , observée lorsque le signal (13) annonce la fin de conversion représente donc pour chacun des ensembles (2) et (4) du schéma général la valeur numérisée de la tension provenant du son capté d'une part et du son du récepteur d'autre part The sampling time of a few nanoseconds, compared to the maximum frequency chosen for the study (4000 Hz) ensures we transform a voltage (9) .The point binary digital value (12) observed when the signal (13) ad the end of conversion is therefore for each of the sets (2) and (4) the general outline the digitized value of the voltage from the sound picked up on the one hand and the sound receiver on the other hand
La figure 3 explicite les phases logiques consécutives exécutées par le montage appelé (5) sur la figure 1 Figure 3 explains the consecutive logical steps performed by the called mount (5) in Figure 1
Cet ensemble se compose d'un dispositif de mise en mémoire séquentielle (18) piloté par un quartz (19) et d'un comparateur statistique (17) ainsi que de 2 mémoires (A) et (B). This set consists of a sequential memory device (18) controlled by a quartz (19) and a statistical comparison (17) as well as two memories (A) and (B).

Une fonction de mise en mémoire (18) , cadencée par un quartz (19) provoque par la commande (14) , à intervalles de temps égaux , correspondant à une fréquence au moins égale à 16000 Hz , une numérisation des signaux R et B dans les parties (2) et (4) de la figure 1 et stocke ces valeurs dans deux mémoires séquentielles (A) et (B) où chaque valeur observée correspondra à un instant donné .Un compteur est associé à cette fonction de mise en mémoire A storing function (18), clocked by a quartz (19) causes the control (14), at equal time intervals, corresponding to a frequency at least equal to 16000 Hz, a scan of the R and B signals in the parts (2) and (4) of Figure 1 and stores these values ​​in two sequential memories (a) and (B) wherein each observed value will correspond to a given instant .A counter is associated to this memory formatting function
Lorsque 1024 valeurs ont été stockées dans chacune des 2 mémoires (A) et (B) , la fonction comparateur statistique (17) est déclanchée When 1024 values ​​have been stored in each of the two memories (A) and (B), statistical comparison function (17) is triggered
Cette fonction lit séquentiellement , et en parallèle les 2 mémoires (A) et (B) . This function reads sequentially and in parallel in the two memories (A) and (B). Elle compare les deux séries afin de déterminer si elles peuvent être considérées comme semblables ou différentes .Cette comparaison est effectuée au moyen d'un algorithme de calcul constant utilisant la méthode statistique de corrélation It compares the two series to determine if they can be considered similar or different .This comparison is performed by a constant calculation algorithm using the correlation statistical method
Il faut remarquer que les 2 mémoires(A)et(a) peuvent être lues de façon parfaitement synchrone (les 2 premières valeurs ensembles , puis les deux suivantes , etc... Note that the 2 memories (A) and (a) can be read perfectly synchronously (the first 2 sets of values, and then the next two, etc ...

ou décalée (père valeur de A avec 2ème valeur de B , puis 2ème de A avec 3ème de B , etc... ) , le décalage étant fourni au comparateur statistique de façon externe dans une mémoire externe (20) initialisée lors de la phase d' étalonnage automatique de l'appareil . or offset (father A value with the second value B, then the second third of A with B, etc ...), the offset being provided to statistical comparison externally in an external memory (20) initialized in phase automatic calibration of the apparatus. Ce décalage peemetde tenir compte du déphasage des deux sons comparés , son surveillé et son de référence This shift peemetde consider the phase shift of the two compared sounds, and monitored its reference sound
Le comparateur statistique(17)sera obtenu en utilisant une The statistical comparison (17) will be obtained by using a
ROM associée à un microprocesseur ROM associated with a microprocessor
La commande d'auto étalonnage (8) consiste en un circuit complémentaire remplissant les fonctions suivantes The self calibration control (8) consists of a complementary circuit that fulfills the following functions
- calage du récepteur piloté sur une station définie à l'avance . - receiver timing controlled on a station set in advance. (Le récepteur surveillé aura été réglé auparavant sur cette même station) (The monitored receiver has been previously set on the same station)
- déclanchement de la fonction mise en mémoire (18) de la Figure 3 - triggering the storing function (18) of Figure 3
- déclanchement du comparateur statistique avec un décalage 0 puis avec différents décalages positifs ou négatifs pour trouver le meilleur résultat de comparaison - - triggering the statistical comparison with offset 0 and with different positive or negative offsets to find the best result of comparison -
- mise dans la mémoire (20) figure 3 de la valeur du décalage ayant fourni le meilleur résultat . - setting in the memory (20) 3 of the offset value that provided the best results. Ce circuit complémentaire peut-être réalisé en logique cablée ou au moyen d'une ROM associée à un microprocesseur This additional circuit may be realized by wired logic or by means of a ROM associated with microprocessor
Le son est capté par branchement direct sur la prise magnétophone du récepteur surveillé ou par un micro placé devant ce récepteur The sound is picked up by direct connection to the tape outlet of the monitored receiver or a microphone placed in front of the receiver
La figure 4 présente une variante des points (1) et (2) de la figure 1 . Figure 4 shows a variant of (1) and (2) of Figure 1. Elle se compose d'un émetteur récepteur ondes courtes (21) , d'un décodeur (22) , d'un convertisseur analogique numérique (23) , d'un filtre passebande 80Hz - 4000Hz (24) et d'une prise de son (25) consistant en un branchement ou un micro . It consists of a short wave transceiver (21), a decoder (22), a digital analog converter (23), a bandpass filter 80Hz - 4000Hz (24) and a sound pickup (25) consisting of a connection or a microphone. Dans cette variante , un élément supplémentaire (21) est utilisé I1 s'agit d'un émetteur récepteur ondes courtes . In this embodiment, an additional element (21) is used I1 is a transceiver waves. Un autre émetteur -récepteur identique est monté à la place des éléments (1) et (2) dans le schéma général . Another identical transceiver transmitter is mounted in place of the elements (1) and (2) in the general scheme. Ceci permet de déplacer le captage du son et sa numérisation assez loin du dispositif de comparaison . This moves the capture of its scanning and far enough from the comparison device. La commande de conversion (14) est transmise par l'émetteur accolé au dispositif de comparaison , précédée d'un code . The conversion control (14) is transmitted by the transmitter attached to the comparison device, preceded by a code. Le code est reconnu par le décodeur(22)qui laisse alors passer la commande pour le convertisseur analogique numérique (23) The code is recognized by the decoder (22) which then passes the command to the digital analog converter (23)
Le résultat de la conversion est transmis par l'émetteur (21) en mode séquentiel au récepteur accolé au dispositif central de comparaison The result of the conversion is transmitted by the transmitter (21) in sequential mode receiver attached to the central device of comparison
Ce dispositif de captage du son éloigné peut-être multiplié This distant sound capture device may be multiplied
Chaque dispositif a un décodeur reconnaissant un code différent . Each device has a decoder recognizing a different code. Ceci permet d'utiliser plusieurs dispositifs de captage avec un seul dispositif de comparaison This allows to use multiple collection devices with a single comparator device
Ce dispositif selon l'invention est plus particulièrement destiné à être utilisé pour des mesures d'audience des différents postes de radio et de télévision dans le foyer This device according to the invention is particularly intended to be used for audience measurement of various radio and television stations in the home

Claims (5)

    REVENDICATIONS 1 ) Dispositif pour effectuer la surveillance automatique de récepteurs radio ou télévision afin d'identifier les.stations ou fréquences reçues à un instant donné, caractérisé en ce qu'il comporte une partie de captation du son (1) émis par le récepteur, un récepteur incorporé (3) piloté par microprocesseur (6) et servant de référence, et un microprocesseur et sa logique spécifique permettant de comparer les sons reçus du récepteur surveillé (1) et du récepteur de référence (3), filtrés et numérisés en (2) et (4), selon la méthode statistique de corrélation (5). CLAIMS 1) Device for the automatic monitoring of radio or television receivers to identify les.stations or frequencies received at a given instant, characterized in that it comprises a sound pickup section (1) transmitted by the receiver, an embedded receiver (3) controlled by the microprocessor (6) and serving as a reference, and a microprocessor and its specific logic for comparing the sounds received from the monitored receiver (1) and the reference receiver (3), filtered and digitized ( 2) and (4), as the statistical correlation method (5).
  1. 20) Dispositif selon la revendication 1, caractérisé en ce qu'il comporte des organes permettant d'obtenir une numérisation simultanée des sons captés à partir du récepteur surveillé (1) et du récepteur de référence (3). 20) Device according to claim 1, characterized in that it comprises means allowing to obtain a simultaneous scan of sounds picked up from the monitored receiver (1) and the reference receiver (3).
  2. 30) Dispositif selon la revendication 1, caractérisé en ce qu'il est muni d'organes permettant de mesurer automatiquement l'écart de temps séparant, d'une part, un son capté à partir du récepteur surveillé (1) et d'autre par, un son capté à partir du récepteur de référence (3), et de stocker cet écart de temps dans une mémoire annexe (20) et d'organes utilisant cette mesure pour comparer deux sources sonores en tenant compte de leur non-simultanéité 30) Device according to claim 1, characterized in that it is provided with organs for automatically measuring the time difference between, on the one hand, a sound picked up from the monitored receiver (1) and other by a sound picked up from the reference receiver (3), and to store this difference in time in a schedule memory (20) and organs using this measurement for comparing two sound sources, taking account of their non-simultaneity
  3. 40) Dispositif selon la revendication 1, caractérisé en ce que le capteur de son et sa mise en forme numérique (1) et (2) sont indépendants du dispositif principal de surveillance (3, 4, 5, 6, 7, 8). 40) Device according to claim 1, characterized in that the sound sensor and digital formatting (1) and (2) are independent of the main monitoring device (3, 4, 5, 6, 7, 8).
    5 ) Dispositif selon la revendication 4, caractérisé en ce que les informations numériques obtenues sur un capteur séparé (23) sont transmises sur une fréquence fixe au dispositif principal de surveillance. 5) Device according to claim 4, characterized in that the digital information obtained from a separate sensor (23) are transmitted on a fixed frequency in the main monitoring device.
    6 ) Dispositif selon l'une quelconque des revendications 4 et 5, caractérisé en ce que le capteur de son et son dispositif de mise en forme numérique sont équipés d'un décodeur (22) permettant au capteur de son à son dispositif associé (23, 24, 25) de reconnaître s'il est destinataire ou non d'une commande issue du disposoitif central de surveillance et de n'exécuter cette commande que dans ce cas. 6) Device according to any one of claims 4 and 5, characterized in that the sensor and its digital shaping device are equipped with a decoder (22) allowing the sound sensor to its associated device (23 , 24, 25) to recognize if it is addressed or not an end command of the central monitoring and disposoitif not run this command in this case.
  4. 70) Dispositif selon l'une quelconque des -reven- dications 4, 5 et 6, caractérisé en ce que le dispositif central de surveillance possède un système de codage de commandes permettant de déclencher à distance un capteur de son et son dispositif de mise en forme numérique associé (23). 70) Device according to any one of -reven- dications 4, 5 and 6, characterized in that the central monitoring device has a control coding system to remotely trigger a sound sensor and formatting device associated digital form (23).
  5. 80) Dispositif selon la revendication 7, caractérisé en ce que le dispositif central de surveillance possède plusieurs mémoires (20) et plusieurs codes de commande de système de captage du son (23) et qu'il peut ainsi surveiller à tour de rôle plusieurs récepteurs télévision et/ou radio. 80) Device according to claim 7, characterized in that the central monitoring device has a plurality of memories (20) and a plurality of sound collection system control codes (23) and it can monitor multiple receivers in turn TV and / or radio.
FR8318621A 1983-11-23 1983-11-23 Device for automatic monitoring of radio or television receivers for the purposes of audience statistics studies of various transmitter stations Withdrawn FR2555383A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8318621A FR2555383A1 (en) 1983-11-23 1983-11-23 Device for automatic monitoring of radio or television receivers for the purposes of audience statistics studies of various transmitter stations

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR8318621A FR2555383A1 (en) 1983-11-23 1983-11-23 Device for automatic monitoring of radio or television receivers for the purposes of audience statistics studies of various transmitter stations
IT6816584A IT1180145B (en) 1983-11-23 1984-11-22 A device for monitoring in an automatic way radio or television receivers in order to identify stations or frequencies received by them particularly for the detection of statistical data of the public of the various issuers
IT5407084U IT8454070V0 (en) 1983-11-23 1984-11-22 A device for monitoring in an automatic way radio or television receivers in order to identify stations or frequencies received by them particularly for the detection of statistical data of the public of the various issuers

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FR2555383A1 true FR2555383A1 (en) 1985-05-24

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IT (2) IT1180145B (en)

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US4955070A (en) * 1988-06-29 1990-09-04 Viewfacts, Inc. Apparatus and method for automatically monitoring broadcast band listening habits
US5023929A (en) * 1988-09-15 1991-06-11 Npd Research, Inc. Audio frequency based market survey method
FR2676151A1 (en) * 1991-04-30 1992-11-06 Bertin & Cie Method and device for measuring the audience of radio broadcasting stations or of television networks
US5278988A (en) * 1991-06-14 1994-01-11 A. C. Nielsen Company Automated receiver monitoring method and apparatus
DE4238681A1 (en) * 1992-11-17 1994-05-26 Werum Karl Ludwig System for the registration of the handset behavior of radio and television broadcasts
FR2715016A1 (en) * 1994-01-10 1995-07-13 Charlet Sandrine Television and radio audience measurement method
FR2717025A1 (en) * 1994-03-01 1995-09-08 Euro Cp Sarl TV programme monitoring for advertising audience research
EP0687083A1 (en) * 1994-06-08 1995-12-13 Erwin Kayser-Threde GmbH Means and method for determining the use made of broadcast programmes
US5881360A (en) * 1995-10-11 1999-03-09 Adcom Information Services, Inc. Non-video path data collection device
NL1010024C2 (en) * 1998-09-08 2000-03-09 Interstructure Bv A system for recording viewing and / or listening habits.
WO2000038360A1 (en) * 1998-12-21 2000-06-29 Adcom Information Services, Inc. Television audience monitoring system and method detecting light emitted by a display of a cable converter box
EP1043853A2 (en) * 1998-05-12 2000-10-11 Nielsen Media Research, Inc. Audience measurement system for digital television
WO2000067155A2 (en) * 1999-04-30 2000-11-09 Xenote, Inc. Method and system for identifying data locations associated with real world observations
US6405370B1 (en) 1998-10-09 2002-06-11 Adcom Information Services, Inc. Television audience monitoring system and method employing tuner interface of set-top converter box
WO2002052759A2 (en) * 2000-12-27 2002-07-04 Nielsen Media Research, Inc. Apparatus and method for determining the programme to which a digital broadcast receiver is tuned
US6484316B1 (en) 1998-10-14 2002-11-19 Adcom Information Services, Inc. Television audience monitoring system and apparatus and method of aligning a magnetic pick-up device
US6567978B1 (en) 1998-10-09 2003-05-20 Adcom Information Services, Inc. Television audience monitoring system and method employing display of cable converter box
EP1458124A2 (en) * 1993-10-27 2004-09-15 Nielsen Media Research, Inc. Audience measurement system
US7774807B2 (en) 1997-01-22 2010-08-10 The Nielsen Company (Us), Llc Source detection apparatus and method for audience measurement
US8151291B2 (en) 2006-06-15 2012-04-03 The Nielsen Company (Us), Llc Methods and apparatus to meter content exposure using closed caption information
US8763022B2 (en) 2005-12-12 2014-06-24 Nielsen Company (Us), Llc Systems and methods to wirelessly meter audio/visual devices
US9015740B2 (en) 2005-12-12 2015-04-21 The Nielsen Company (Us), Llc Systems and methods to wirelessly meter audio/visual devices
US9055336B2 (en) 2006-03-31 2015-06-09 The Nielsen Company (Us), Llc Methods, systems and apparatus for multi-purpose metering
US9124769B2 (en) 2008-10-31 2015-09-01 The Nielsen Company (Us), Llc Methods and apparatus to verify presentation of media content

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