Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!usc!hacgate!goddard@aic.hrl.hac.com From: goddard@aic.hrl.hac.com Newsgroups: sci.electronics Subject: Re: automatic commercial deletion Keywords: commercials, compressors, VCRs, film editting Message-ID: <5171@hacgate.UUCP> Date: 22 Sep 89 22:49:14 GMT References: <6428@ingr.com> <11213@fluke.COM> <137@raider.MFEE.TN.US> Sender: news@hacgate.UUCP Reply-To: goddard@aic.hrl.hac.com Distribution: usa Organization: Hughes Aircraft Co., El Segundo, CA Lines: 28 In article <137@raider.MFEE.TN.US> crc@raider.MFEE.TN.US (Charles Cain) writes: >But all of this is for naught if a station decides to block a network promo >or commercial with their own. In that case, their is no way that I can think >of that a 'commercial killer' could pick it up, unless it looked for a timing >shift from one signal to the other, or looked for compressed audio, which >commercials are HIGHLY compressed to create the effect of louder and hence >get your attention. This last method would probably be the best way to have >something know it was receiving a commercial and do a backspace edit to last >black and pause the recorder. Is this technique something one could hope to use online, i.e. as I watch the TV, when a commercial break begins (or soon thereafter), have the TV automatically muted? How does one detect compressed audio? What is compressed audio? Sorry if these questions are really naive. Nigel Goddard e x t r a l i n e s