lollerskates Posted January 29, 2005 Report Share Posted January 29, 2005 How come if you record something in long play (on vhs), then play it in a short play player, the sound is at normal speedshouldnt it be at double speed?i've never understood this. ever Quote Link to comment Share on other sites More sharing options...
Guest MarkJDelaney Posted January 29, 2005 Report Share Posted January 29, 2005 If you record something in long play, quality is less than if it was recorded in slow play.SP recordings run past the head drum (tape reader) at 1.31 inches per second. In LP it's 0.66 inches per second. So you can see where the quality deteriorates. (rough figures, probably varies between VCRs)As for a SP VCR playing an LP recording, well that doesn't matter. The recording's already been made, audio + video is stretched out across the tape. An SP VCR can read both types of recordings but can't RECORD in LP. It just plays whatever type of tape you put inside to be read.An example to explain it a little more:Say you have two of same videos on your computer. One is 300MB with a high frame-rate, and the other one is 70MB with a low frame rate. They will both play when you open the file to read it, but one will retain much better quality. Quote Link to comment Share on other sites More sharing options...
Guest haigyman Posted January 29, 2005 Report Share Posted January 29, 2005 yes but that doesn't answer his question at allunless you're saying he's wrong about the sound not being double speed, i can't be bothered to check if it is or isn't Quote Link to comment Share on other sites More sharing options...
Tav Posted January 29, 2005 Report Share Posted January 29, 2005 I can record something on long play on one video then when I paly it back on a SP only machine it plays double the speed...well could with our older machine. Quote Link to comment Share on other sites More sharing options...
threeornothing Posted January 29, 2005 Report Share Posted January 29, 2005 This is a joke yeah.....if that was the case , say you had a 10 minute video cassette, and recorded a 20 minute program on long play, your short play video would have played the 20 minutes of video in 10 minutes, and would then be playing the remaining 10 minutes of audio after the tape had reached the end!!!! Quote Link to comment Share on other sites More sharing options...
Guest MarkJDelaney Posted January 30, 2005 Report Share Posted January 30, 2005 No, audio and video are recorded together. Across across an LP VHS tape. When played back on a VCR, it doesn't matter. The VCR will play back simply what is there... regardless of its original recording speed/quality. Quote Link to comment Share on other sites More sharing options...
Sue Denim.. Posted January 30, 2005 Report Share Posted January 30, 2005 How come if you record something in long play (on vhs)' date=' then play it in a short play player, the sound is at normal speedshouldnt it be at double speed?i've never understood this. ever[/quote']Yes it should, however, there are 'control tracks' on the tape itself which dictate the speed of the drum (which scans the information on the tape.) Even if your VCR is ancient, the control tracks still change the speed of the drum. This is constantly changing even on regular play due to tapes stretching or getting tighter whilst being played. Also, the slower the recording (Long Play) the closer the recorded bands of information are which degrade the quality. Note, the recorded bands of information are not linear like the control bands which sort of means that the control band must be pretty damned accurate on long play as the recorded bands are so close. That really is as simple as I can make it. Quote Link to comment Share on other sites More sharing options...
lollerskates Posted January 30, 2005 Author Report Share Posted January 30, 2005 i see .. Quote Link to comment Share on other sites More sharing options...
threeornothing Posted January 30, 2005 Report Share Posted January 30, 2005 I don't think anyone is actually getting the main question being asked here... they're saying the audio remains at the correct pitch, although the video plays twice as fast. Thats bullshit, how could you hear 20 minutes of audio in 10 minutes.....UNLESS IT WAS PLAYING AT TWICE THE SPEED!!!!I think lollerskates taped a Joe Pasquali show and can't really tell the difference.... Quote Link to comment Share on other sites More sharing options...
Sue Denim.. Posted January 30, 2005 Report Share Posted January 30, 2005 I don't think anyone is actually getting the main question being asked here... they're saying the audio remains at the correct pitch' date=' although the video plays twice as fast. Thats bullshit, how could you hear 20 minutes of audio in 10 minutes.....UNLESS IT WAS PLAYING AT TWICE THE SPEED!!!![/quote']No, you don't understand. You are listening to the recording that has been compressed together more than before. It WILL play at the correct pitch. The control drum changes speed to accommodate the difference in tape playing speed. Quote Link to comment Share on other sites More sharing options...
Guest MarkJDelaney Posted January 30, 2005 Report Share Posted January 30, 2005 Keilan 303, read all these posts from the thread a few times. If you still don't get it, then well... good luck with that. Quote Link to comment Share on other sites More sharing options...
Guest haigyman Posted January 30, 2005 Report Share Posted January 30, 2005 No' date=' you don't understand. You are listening to the recording that has been compressed together more than before. It WILL play at the correct pitch. The control drum changes speed to accommodate the difference in tape playing speed.[/quote']on my video recorder, which is sp only, the sound on an lp recording isn't at the correct pitch, it is speeded up just like the picture Quote Link to comment Share on other sites More sharing options...
Guest MarkJDelaney Posted January 30, 2005 Report Share Posted January 30, 2005 on my video recorder' date=' which is sp only, the sound on an lp recording isn't at the correct pitch, it is speeded up just like the picture[/quote']Like Tav said, his older machine used to do that. My guess is that as technology has moved on, VCRs developed variable drum head speeds capable of reading SP and LP tapes. Quote Link to comment Share on other sites More sharing options...
threeornothing Posted January 30, 2005 Report Share Posted January 30, 2005 I think everyone is trying to be too technical for their own good.....Suppose you made a 1 minute of a recording of a metronome playing at 120bpm. You would have recorded 120 beats.Now if that recording had been made on LP then played on an SP video, you may well hear all 120 beats, however the speed will be 240bpm.Funnily enough, 120bpm does not equal 240bpm, hence THE AUDIO WILL NOT BE PLAYING AT THE SAME SPEED AS IT WAS RECORDED!!!!!If you were able to hear all 120 beats at 120bpm in 30 seconds......I need to know how you are able to stop time..... Quote Link to comment Share on other sites More sharing options...
David Posted January 30, 2005 Report Share Posted January 30, 2005 all i know is that with the old vcr i had at home, if you tried playing a lp tape in it, both the audio and video would be speeded up (so the audio was at a higher pitch)David Quote Link to comment Share on other sites More sharing options...
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