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DSP Filters and slopes?
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<blockquote data-quote="John Roberts" data-source="post: 27184" data-attributes="member: 126"><p>Re: DSP Filters and slopes?</p><p></p><p>I recall back in the '70s when I worked at a company doing pitch shifting for restoring the pitch of speeded up talking book tape recordings. One approach investigated by the engineers at bell labs was effectively to capture and re-synthesize the speech at the altered pitch ratio (simply scale the pitch of the frequency components). A good idea on paper perhaps, but not practical, especially 40+ years ago. So even the most sophisticated pitch shifters are variants on sampling and stretching or shrinking those samples to a desired pitch (with gaps or discarded redundant data depending on the direction of pitch shift). </p><p></p><p>So a similar concept of capture and re-synthesis of the music could arbitrarily delete some single offending frequency component, but the computing power to do this would be serious, and that synthesizer would have to be very very good... So I will never say it couldn't be done, but not practical in my limited understanding of modern technology. </p><p></p><p>JR</p></blockquote><p></p>
[QUOTE="John Roberts, post: 27184, member: 126"] Re: DSP Filters and slopes? I recall back in the '70s when I worked at a company doing pitch shifting for restoring the pitch of speeded up talking book tape recordings. One approach investigated by the engineers at bell labs was effectively to capture and re-synthesize the speech at the altered pitch ratio (simply scale the pitch of the frequency components). A good idea on paper perhaps, but not practical, especially 40+ years ago. So even the most sophisticated pitch shifters are variants on sampling and stretching or shrinking those samples to a desired pitch (with gaps or discarded redundant data depending on the direction of pitch shift). So a similar concept of capture and re-synthesis of the music could arbitrarily delete some single offending frequency component, but the computing power to do this would be serious, and that synthesizer would have to be very very good... So I will never say it couldn't be done, but not practical in my limited understanding of modern technology. JR [/QUOTE]
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