Abstract: Multiple signals received through different transmission mediums are synchronized within a set top box (STB) for subsequent mixing and presentation. For example, a video program transmitted via a cable network is synchronized with a secondary audio program, such as a radio program, received via the Internet. In another example, a video program transmitted via a cable network is synchronized with one or more programmed events, such as directives to display text or graphics or animation, play streaming media, direct a browser to a particular web page, and the like.

Abstract: According to one embodiment, in response to a user pressing an alternative audio button while watching a television broadcast, the user is provided with a list of secondary audio programs (e.g., radio programs received via the Internet) to replace the primary audio program associated with the broadcast. After a secondary audio program is selected, a synchronization component determines an extra transmission delay associated with the secondary audio program. A buffering component then buffers the video program for a period of time equal to the extra delay. A mixing component then mixes the synchronized video program with the secondary audio program, which are then presented to the user.