Patent ID: 7712123
Filing Date: 2010-05-04
Classification: H04N

Abstract:
1. A broadcast synchronization type service providing method where a broadcasting station or a broadcast information storing server sends broadcast information including voice and video and performs a method comprising: superimposing a data signal on voice at a same rate as a video frame rate of the video by deleting specific frequency components of the voice in response to a low or a high signal of binary data from said data signal; and sending said broadcast information including said voice that includes said data signal, said data signal including a channel identifier uniquely assigned to a broadcast channel and an image frame identifier uniquely assigned to an image frame in video, said data signal does not include a voice frame identifier; in a receiving side, a viewer apparatus performs a method comprising, collecting broadcast voice output from a speaker of a broadcast receiving apparatus, that receives said broadcast information, by using a microphone, and converting said broadcast voice into an electrical signal; extracting said data signal superimposed on said electrical signal continuously one after another by detecting the deleted frequency components of said voice and reproducing said binary data of said data signal; extracting said channel identifier and said image frame identifier from said data signal; obtaining related information corresponding to said channel identifier and said image frame identifier via a network; sending the image frame identifier as a time-series continuous number by said broadcasting station or said broadcast information storing server; using the image frame identifier by the viewer apparatus as an image frame identifier of an image that is currently reproduced by the broadcast receiving apparatus, when said viewer apparatus continuously extracts said data signal superimposed on said voice from said voice output from said speaker of said broadcast receiving apparatus, if said data signal is correctly extracted from said voice so that said image frame identifier is recognized; and generating and using an image frame identifier by the viewer apparatus on the basis of a value of an image frame identifier that is most recently recognized, and on the basis of a difference between a time when said most recently recognized image frame identifier is recognized and a current time, if said data signal is not correctly extracted from said voice so that said image frame identifier is not recognized.