But it was pretty neat to watch the VU meters “peg” when cranking up the power amplifiers on our stereo systems.
Jim From: Ralph McDiarmid <[email protected]> Sent: Sunday, November 10, 2024 1:45 PM To: [email protected] Subject: [EXTERNAL] Re: [PSES] Emissions Class A vs Class B This message is from an EXTERNAL EMAIL system. Use caution and think before opening attachments, clicking links, or responding. Another sidebar. The VU meter (or its approximation) was also included in some HiFi equipment. Its accuracy may have been a question mark in many brands, similar to the S-meter in amateur radio equipment. Its inclusion in consumer equipment was more decorative than it was useful. Ralph From: Brent DeWitt <[email protected]<mailto:[email protected]>> Sent: November 10, 2024 5:55 AM To: [email protected]<mailto:[email protected]> Subject: Re: [PSES] Emissions Class A vs Class B Again, I speak from urban legend: My understanding is that the Quasi-Peak detector was based on the "VU meter", common to audio recording, The idea was to approximate the the perceived loudness to the human ear. For those haven't seen one, the VU meter is also a fast attack, slow release device and still used/emulated in recording studios. Brent DeWitt, AB1LF 🙂 On 11/10/2024 8:43 AM, Jim Bacher, WB8VSU wrote: One of the issues that pushed the FCC forward was significant interference with police and fire communications during emergency events in Los Vegas. The interterence was due to the the new computer driven gaming machines. That in the late 1970s. I was told Quasi Peak is used, due to video noise. Consumers would not mind a couple of white dots on their TVs, but a whole screen of white dots would be an issue. Jim Bacher, WB8VSU [email protected]<mailto:[email protected]> or [email protected]<mailto:[email protected]> JBRC Consulting LLC ________________________________ This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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