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<blockquote data-quote="Art Welter" data-source="post: 216921" data-attributes="member: 52"><p>Carl,</p><p></p><p>That is generally not true. The Dolby B&C pre-emphasis boosts<em> low-level</em> high frequency signal, but as level increases, boosts less.</p><p>Signal recorded above -10 are hardly affected by Dolby B.</p><p>Playing back an encoded tape without using Dolby results in more high frequency level and more tape hiss, but bass signal, generally recorded at higher level than high frequency, is largely unaffected.</p><p>Without the de-emphasis effect of the Dolby decoder, the sound will be perceived as brighter as low recording level high frequencies are emphasized, while low frequency signal dynamics remain the same.</p><p>[ATTACH=full]209620[/ATTACH]</p><p>Digital codecs have been designed to duplicate the dynamic response of the analog Dolby B&C encoder/decoder:</p><p><a href="http://www.anaxwaves.com/DDiCodec/" target="_blank">http://www.anaxwaves.com › DDiCodec</a></p><h3><a href="http://www.anaxwaves.com/DDiCodec/" target="_blank">DDi Codec (software Dolby-C and Dolby-B compander)</a></h3></blockquote><p></p>
[QUOTE="Art Welter, post: 216921, member: 52"] Carl, That is generally not true. The Dolby B&C pre-emphasis boosts[I] low-level[/I] high frequency signal, but as level increases, boosts less. Signal recorded above -10 are hardly affected by Dolby B. Playing back an encoded tape without using Dolby results in more high frequency level and more tape hiss, but bass signal, generally recorded at higher level than high frequency, is largely unaffected. Without the de-emphasis effect of the Dolby decoder, the sound will be perceived as brighter as low recording level high frequencies are emphasized, while low frequency signal dynamics remain the same. [ATTACH type="full" alt="Screen Shot 2022-08-13 at 1.53.06 PM.png"]209620[/ATTACH] Digital codecs have been designed to duplicate the dynamic response of the analog Dolby B&C encoder/decoder: [URL='http://www.anaxwaves.com/DDiCodec/']http://www.anaxwaves.com › DDiCodec[/URL] [HEADING=2][URL='http://www.anaxwaves.com/DDiCodec/']DDi Codec (software Dolby-C and Dolby-B compander)[/URL][/HEADING] [/QUOTE]
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