EntityQ1653619· pop 33· linked from 384 articlestest cardSign in to savesignal test used in television broadcastingConnectionsLED displayEntityproduction musicEntityUnited StatesCountryAustraliaCountryCanadaCountryUnited KingdomCountryChileCountryAustriaCountryMonacoCountryNorth KoreaCountrySoviet UnionConcepttelevisionEntityYouTubeConceptArtificial intelligenceConceptjazzEntityCzechoslovakiaEntityGerman Democratic RepublicEntityNetflixConceptX-rayEntityWest GermanyEntityCategoriesAccuracy disputes from August 2022Broadcast engineeringTest cards