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Laserdisc: How It Works (1980)



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Short | Documentary





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1.33 : 1
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Being one of the few posting who has actually seen this...
1 September 2002 | by (United States) – See all my reviews

This programme is on the other side of a demonstration LaserDisc for the VP-1000 produced by Pioneer. The other side of this demo disc also has "LaserDisc: What it is."

Although the production is dated, Mr. Wizard clearly and accurately explains how the LaserVision system works, or at least with the CAV (Constant Angular Velocity) aspect of it. He also explains why LaserDisc has better picture with no wearout factor in comparison to Betamax and VHS with typically high accuracy in his explanations.

He explains quite clearly what the laser does in the player and on the disc, and that explanation still applies to disc players using reflective laser optics used today, including DVD.

He also explains how the laser can keep track on the disc, even if it has a certain degree of damage or warpage, and/or variations in quality. And, yes, that explanation still applies to all reflective laser optical readers, including DVD players.

As for laser light holding information, his explanation is simple, easy to understand, and dead-on accurate; it even still applies to laser optical disc technologies used today.

As an example to this, DVD discs hold more information than CD discs, despite being the same size, because the wavelengths of the laser lights used to read the discs are different. Since DVD uses a shorter wavelength light than CD, which also means higher frequency light, the pit density of a DVD disc is allowed to be higher, which means that more information can be stored in the same amount of physical space. This means that, since DVDs use shorter wavelength light, more information can be trasmitted with it, allowing the use of a higher pit density to take advantage of this.

"The shorter the wavelength, the more information the light can carry," so says Mr. Wizard on this excellent demonstration supplement.

This programme is part of a dual sided disc containing two different programmes advertising for the Pioneer VP-1000 LaserDisc player. Limited copies were made and were not available for public sale as they were intended for use as showroom demonstration material. Rarest copies were made in USA by DiscoVision Associates, but higher quality copies were made in Japan by Pioneer.

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