An idea from the 1950s is reintroduced, reevaluated, and improved to produce a digital system of high quality with a bit rate of only about 250 kbits/second. Where channel widths or bandwidth considerations are such to prevent the use of higher quality 16-bit pem systems, the new approach can be used giving a quality significantly superior to today's broadcast standards, at a greatly reduced cost to pem, and possessing a fundamentally more robust cost to pem, and possessing a fundamentally more robust resistance to many types of errors than pem.
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