EP 0195639 A2 19860924 - Improvements relating to television audience research systems.
Title (en)
Improvements relating to television audience research systems.
Title (de)
Fernsehzuschauerzählsysteme.
Title (fr)
Systèmes de mesure d'audience de télévision.
Publication
Application
Priority
AU 978885 A 19850318
Abstract (en)
System and apparatus for television audience research in relation to use of V.C.R., live T.V. or cable T.V., including a signature generator associated with an encoder related to a series of programmes or channels available to the television audience, apparatus to substitute the signature frequency for the UHF or VHF signals received by a television receiver tuner or V.C.R. tuner and apparatus already present in the T.V. or V.C.R. to accept the signature frequency to the exclusion of all others and a decoder collecting output intelligence contained in the signature to establish whether the T.V. or V.C.R. is switched to a particular program representative of the signature. The encoder may be variable to provide a sweep of frequencies and signatures representative of all channels in the viewing area and multiple decoders may be used one for each receiver feeding into a multiplexer.
IPC 1-7
IPC 8 full level
H04H 9/00 (2006.01); H04H 20/31 (2008.01); H04H 60/43 (2008.01); H04N 17/00 (2006.01)
IPC 8 main group level
H04H 1/00 (2006.01)
CPC (source: EP)
H04H 20/31 (2013.01); H04H 60/43 (2013.01)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0195639 A2 19860924; JP S61269596 A 19861128; NO 860998 L 19860919
DOCDB simple family (application)
EP 86301944 A 19860317; JP 6047786 A 19860318; NO 860998 A 19860317