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<blockquote data-quote="drew gandy" data-source="post: 107907" data-attributes="member: 880">Re: HyperboLine ™ new Player in the Old GameIt is my understanding (and I could be wrong about this) that the telephone bandwidth was determined long before any digital stuff got put into use and was the result of speech intelligibility research.&nbsp; I think that 8khz sampling was chosen to support the already established spectrum.&nbsp; btw, your 4.5db attenuation appears to me to be a better case example.&nbsp; For instance, at 85 deg F temp and 20% humidity the absorption is almost 13db. I&#039;m not sure how often it gets that dry at 85 but even at 50% humidity at 85 deg it&#039;s over 10db of attenuation. The calculator that Art linked to in the first post is pretty cool and shows that the air absorption is a pretty strong variable.&nbsp; It seems to make sense to tilt the response towards the top end for outdoor and long throw applications as compared to the telephone receiver where the sound travels mere millimeters.</blockquote>

[QUOTE="drew gandy, post: 107907, member: 880"] Re: HyperboLine ™ new Player in the Old Game It is my understanding (and I could be wrong about this) that the telephone bandwidth was determined long before any digital stuff got put into use and was the result of speech intelligibility research. [I]I think[/I] that 8khz sampling was chosen to support the already established spectrum. btw, your 4.5db attenuation appears to me to be a better case example. For instance, at 85 deg F temp and 20% humidity the absorption is almost 13db. I'm not sure how often it gets that dry at 85 but even at 50% humidity at 85 deg it's over 10db of attenuation. The calculator that Art linked to in the first post is pretty cool and shows that the air absorption is a pretty strong variable. It seems to make sense to tilt the response towards the top end for outdoor and long throw applications as compared to the telephone receiver where the sound travels mere millimeters. [/QUOTE]

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