While radio stations have used both audible and inaudible cues--I don't think the major tv networks have ever.
I know that NBC could "trigger" a local video insert id at the beginning of a program segment (inserted by the local station from nbc equipment or equipment adapted to "read" the signal) but I don't think the system was ever used or designed to trigger local ad insertions. Either the ads are programmed in advance (if the station is automated) by pre-known times OR the operator watches for a specific promotional announcement that runs a specfic length. At one time -- CBS ids were 23 seconds--20 seconds of promo and 3 secs of cbs eye, ABC would use ids as short as 5 seconds but now all the lengths seem to vary but stick around about 20 seconds. On the cable networks--those ads are triggered by an inaudible signal -- years ago DTMF (I think that's what they were called) were used to start, indicate length of break and end for cable stations. On Sep 10, 10:48 pm, Ben Scripps <[email protected]> wrote: > Not anymore, at least as far as CBS is concerned. I believe they're > working on a replacement, but the old system was incompatible with the > fancy new digital teevee signal. > > And even when the system was still in use, not all stations used it. > > On Thu, Sep 10, 2009 at 9:44 PM, Bob in Jersey <[email protected]> wrote: > > > > > Don't networks still send inaudible cues to affiliates to tell them > > when a local break is coming up? > > > If so, they'd suspend sending them out while the speech was > > progressing. > > > -- > > BOB > > -- > -- > Ben Scripps > [email protected] --~--~---------~--~----~------------~-------~--~----~ TV or Not TV .... The Smartest (TV) People! You received this message because you are subscribed to the Google Groups "TV or Not TV" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/tvornottv?hl=en -~----------~----~----~----~------~----~------~--~---
