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From: gjphw@iham1.UUCP
Newsgroups: net.audio
Subject: Re: CD Reflections
Message-ID: <289@iham1.UUCP>
Date: Mon, 21-Jan-85 19:30:09 EST
Article-I.D.: iham1.289
Posted: Mon Jan 21 19:30:09 1985
Date-Received: Wed, 23-Jan-85 04:45:12 EST
Organization: AT&T Bell Labs, Naperville, IL
Lines: 28



   So, okay, what bandwidth can we accept to provide good transient
 response and imaging?  Is it so difficult to design and build chips
 that can avoid introducing coloring into the audio range, given that
 most amplifiers only attempt to be linear for continuous sine waves
 between 20 and 20k Hz?  What bandwidth would be acceptable for
 recording - 20 to 45k, 1 to 50k?  Why not have designed a recording
 process that would have performed all the sampling and filtering magic
 far above the audio band, rather than allowing Carver an opening for
 his image enhancer?

   Also, what was so difficult about logarithmic encoding?  This would
 have yielded a uniform distortion due to quantization with signal
 strength rather than the *greater at low levels, less at high levels*
 that is obtained with the current linear encoding.

   I have no answers but only questions, yet I suspect the marketing
 department rather than the engineering department.  These issues are
 probably discussed in the relevant trade journals, but I do not read
 them.

-- 

                                    Patrick Wyant
                                    AT&T Bell Laboratories (Naperville, IL)
                                    *!iham1!gjphw