Date   : Thu, 04 Nov 2010 07:23:07 -0500
From   : jules.richardson99@... (Jules Richardson)
Subject: Acorn's US patent

Rick Murray wrote:
> Though as I am reading this, I have a mental hiccup on:
> 
>     The rate at which data can be read from a CD-ROM is limited to about
>     150,000 bytes per second which allows about 6000 bytes for each
>     frame at a frame rate of 25 frames per second. This is reduced to
>     about 500 bytes per frame when provision is made recording sound to
>     accompany the moving images and to allow for access latency in the
>     storage device. Compressing an image of an acceptable quality to
>     5000 bytes per frame requires the use of sophisticated compression
>     and decompression algorithms which in turn place high demands upon
>     the processing capacity of the computer system.
> 
> Did you spot it too? When you add in sound to the CD-ROM data speed, it 
> leaves you a paltry five HUNDRED bytes per frame.

Typo I think - shouldn't that be "This is reduced by about 500 bytes per 
frame..." (which would be somewhere around 12.5KHz mono sample rate - not 
taking latency into account - and probably not unrealistic for the time)?

cheers

Jules