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Junior Varsity
Digital guru needed
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<blockquote data-quote="John Roberts" data-source="post: 84094" data-attributes="member: 126"><p>Re: Digital guru needed</p><p></p><p>Back in the early '70s I worked as a technician for a company developing time-compression or pitch shift for pre-recorded material, predominantly targeting talking books for blind market. Since you can comprehend pre-recorded speech at 2x or more if pitch corrected. Of course there were licensees working on small amounts of time compression with pitch correction for squeezing an extra commercial or three into a late night movie. </p><p></p><p>As the opposite of ignorance being bliss, I am now cursed with knowing how to recognize the sound of old movies being time squeezed. Hint- it is most audible on orchestral background music. where the perturbations caused by splicing between samples to discard the now too much data, causes a burbling sound (technical term) with a period in the half second to 2 second repeat rate. Since they seem to already play 2 hour movies in 3 hours of TV time this wouldn't seem necessary. Another place this is apparent is in old serial TV shows produced for tight 30 min or 60 min slots, while some satellite channels don't even pretend and put 30 min shows in 40 min slots, or even play several in a row (like MASH) with different length slots for each. </p><p></p><p>This discussion reminded about all this, and now I'm freshly sensitive to this again. I'm a little surprised that they aren''t using newer different technology, not there are any completely transparent ways to seamlessly discard X% of the data without hearing something. Actually this is not very audible on speech due to percussive nature and short pitch periods (singing with longer held notes is harder). It's mostly on the orchestral passages holding chords for several seconds where you can really hear it burbling away. </p><p></p><p>Thanks Dick... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>JR</p></blockquote><p></p>
[QUOTE="John Roberts, post: 84094, member: 126"] Re: Digital guru needed Back in the early '70s I worked as a technician for a company developing time-compression or pitch shift for pre-recorded material, predominantly targeting talking books for blind market. Since you can comprehend pre-recorded speech at 2x or more if pitch corrected. Of course there were licensees working on small amounts of time compression with pitch correction for squeezing an extra commercial or three into a late night movie. As the opposite of ignorance being bliss, I am now cursed with knowing how to recognize the sound of old movies being time squeezed. Hint- it is most audible on orchestral background music. where the perturbations caused by splicing between samples to discard the now too much data, causes a burbling sound (technical term) with a period in the half second to 2 second repeat rate. Since they seem to already play 2 hour movies in 3 hours of TV time this wouldn't seem necessary. Another place this is apparent is in old serial TV shows produced for tight 30 min or 60 min slots, while some satellite channels don't even pretend and put 30 min shows in 40 min slots, or even play several in a row (like MASH) with different length slots for each. This discussion reminded about all this, and now I'm freshly sensitive to this again. I'm a little surprised that they aren''t using newer different technology, not there are any completely transparent ways to seamlessly discard X% of the data without hearing something. Actually this is not very audible on speech due to percussive nature and short pitch periods (singing with longer held notes is harder). It's mostly on the orchestral passages holding chords for several seconds where you can really hear it burbling away. Thanks Dick... :-) JR [/QUOTE]
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