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Junior Varsity
Digital Boards - Sound Quality
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<blockquote data-quote="John Roberts" data-source="post: 34977" data-attributes="member: 126"><p>Re: Digital Boards - Sound Quality</p><p></p><p>I make a point of not arguing about what other people say they hear, and generally if someone claims a "massive" improvement, that suggests that something measurable happened. </p><p></p><p>There has been a lot of investigation into this phenomenon and I am not aware of a smoking gun, identified in bench testing, while subjective anecdotal claims persist. </p><p></p><p>Yes, jitter or clock uncertainty would reveal as a low level noise/distortion, so THD or linearity would be the obvious bench test. The subjective claims suggest that some very fine (small) time resolution uncertainties impact stereo sound field localization. Our brain often uses first arrival to localize so hypothetically, competing arrival times in a stereo sound field could alter perception, but jitter occurs to the clock so impacts the digital data on a per bit basis**. Per word would get some average jitter applied, and per cycle of a waveform or per transient, would average this out further over the multiplicity of samples it takes to capture a single transient event. </p><p></p><p>I try to be open minded about such things but the evidence for this being a "massive" phenomenon is not well supported. I am not even aware of successful blind testing, while such a success may reveal more about the shortcomings of a particular hardware platform than a general digital audio phenomenon. </p><p></p><p>This has been batted around in the press for years, if there was some there there, this would be well characterized by now and manufacturers would have stepped up. </p><p></p><p>...but the customer is always right so do what makes you happy. I remain skeptical and unconvinced.</p><p></p><p>JR</p><p></p><p>** this is actually a little more complex than that with actual modern A/D and D/A conversion technology (oversampling etc). Logically it seems this (jitter) would matter most at both conversions.</p></blockquote><p></p>
[QUOTE="John Roberts, post: 34977, member: 126"] Re: Digital Boards - Sound Quality I make a point of not arguing about what other people say they hear, and generally if someone claims a "massive" improvement, that suggests that something measurable happened. There has been a lot of investigation into this phenomenon and I am not aware of a smoking gun, identified in bench testing, while subjective anecdotal claims persist. Yes, jitter or clock uncertainty would reveal as a low level noise/distortion, so THD or linearity would be the obvious bench test. The subjective claims suggest that some very fine (small) time resolution uncertainties impact stereo sound field localization. Our brain often uses first arrival to localize so hypothetically, competing arrival times in a stereo sound field could alter perception, but jitter occurs to the clock so impacts the digital data on a per bit basis**. Per word would get some average jitter applied, and per cycle of a waveform or per transient, would average this out further over the multiplicity of samples it takes to capture a single transient event. I try to be open minded about such things but the evidence for this being a "massive" phenomenon is not well supported. I am not even aware of successful blind testing, while such a success may reveal more about the shortcomings of a particular hardware platform than a general digital audio phenomenon. This has been batted around in the press for years, if there was some there there, this would be well characterized by now and manufacturers would have stepped up. ...but the customer is always right so do what makes you happy. I remain skeptical and unconvinced. JR ** this is actually a little more complex than that with actual modern A/D and D/A conversion technology (oversampling etc). Logically it seems this (jitter) would matter most at both conversions. [/QUOTE]
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