{"id":13840,"date":"2024-05-29T20:52:20","date_gmt":"2024-05-29T18:52:20","guid":{"rendered":"https:\/\/www.bramjacobse.nl\/wordpress\/?p=13840"},"modified":"2024-08-18T21:54:58","modified_gmt":"2024-08-18T19:54:58","slug":"29-08-1978-confidential-compact-disc-system","status":"publish","type":"post","link":"https:\/\/www.bramjacobse.nl\/wordpress\/?p=13840","title":{"rendered":"29-08-1978 – Confidential : Compact Disc System"},"content":{"rendered":"

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Na gekomen reactie<\/p>\n

” In de confidenti\u00eble beschrijving uit 1978 van het systeem staat een tekening van het loopwerk met de radiale actuator met een afgeveerd contragewicht. De actuator bleef gebalanceerd. Idee was dat dan minder energie nodig was bij hoge frequenties om de lichtspot te bewegen, de veer koppelt immers het contragewicht, dat achterste deel, af bij hoge frequenties, en de versterking van de radiale motor was dan bij de lichtspot 2 maal groter. Heel plausibel, maar toch niet zo’n best idee. Parasitaire resonanties in de radiale regelsysteem, vooral veroorzaakt door de veertjes van de focus-actuator, waren dan bij hoge frequenties ook twee keer zo prominent aanwezig, waardoor de versterking in het radiale systeem bij lage frequenties lager moest zijn om het systeem stabiel te houden. Zo werd de reductie van de spoor-volgfout kleiner.”<\/strong><\/em><\/p>\n

“The confidential description of the system from 1978 contains a drawing of the running gear with the radial actuator with a sprung counterweight. The actuator remained balanced. The idea was that less energy was needed at high frequencies to move the light spot, because the spring disconnects the counterweight, that rear part, at high frequencies, and the gain of the radial motor was then twice as large at the light spot. Very plausible, but still not such a good idea. Parasitic resonances in the radial control system, mainly caused by the springs of the focus actuator, were then also twice as prominent at high frequencies, which meant that the gain in the radial system had to be lower at low frequencies to keep the system stable. In this way, the reduction of the tracking error was smaller.”<\/strong><\/em><\/p>\n

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Source : Internet archive<\/p>\n","protected":false},"excerpt":{"rendered":"

                            Na gekomen reactie ” In de confidenti\u00eble beschrijving uit 1978 van het systeem staat een tekening van het loopwerk met...<\/p>\n","protected":false},"author":1,"featured_media":13846,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[121],"tags":[],"class_list":["post-13840","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-philips"],"yoast_head":"\n29-08-1978 - Confidential : Compact Disc System - Bram Jacobse<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bramjacobse.nl\/wordpress\/?p=13840\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"29-08-1978 - Confidential : Compact Disc System - Bram Jacobse\" \/>\n<meta property=\"og:description\" content=\"                            Na gekomen reactie ” In de confidenti\u00eble beschrijving uit 1978 van het systeem staat een tekening van het loopwerk met...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.bramjacobse.nl\/wordpress\/?p=13840\" \/>\n<meta property=\"og:site_name\" content=\"Bram Jacobse\" \/>\n<meta property=\"article:published_time\" content=\"2024-05-29T18:52:20+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-08-18T19:54:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.bramjacobse.nl\/wordpress\/wp-content\/uploads\/2024\/05\/Confidential-Compact-Disc-System.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1674\" \/>\n\t<meta property=\"og:image:height\" content=\"864\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Bram\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Bram\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/?p=13840#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/?p=13840\"},\"author\":{\"name\":\"Bram\",\"@id\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/#\\\/schema\\\/person\\\/046607e546e3a7190b34f7793abbe6fe\"},\"headline\":\"29-08-1978 – Confidential : Compact Disc System\",\"datePublished\":\"2024-05-29T18:52:20+00:00\",\"dateModified\":\"2024-08-18T19:54:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/?p=13840\"},\"wordCount\":295,\"publisher\":{\"@id\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/#\\\/schema\\\/person\\\/046607e546e3a7190b34f7793abbe6fe\"},\"image\":{\"@id\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/?p=13840#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/wp-content\\\/uploads\\\/2024\\\/05\\\/Confidential-Compact-Disc-System.jpg\",\"articleSection\":[\"Philips\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/?p=13840\",\"url\":\"https:\\\/\\\/www.bramjacobse.nl\\\/wordpress\\\/?p=13840\",\"name\":\"29-08-1978 - 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