{"id":2683,"date":"2019-10-10T07:53:33","date_gmt":"2019-10-10T07:53:33","guid":{"rendered":"http:\/\/protodev.ee\/?page_id=2683"},"modified":"2024-06-24T12:57:07","modified_gmt":"2024-06-24T12:57:07","slug":"sound-catcher","status":"publish","type":"page","link":"https:\/\/www.prototehas.ee\/en\/sound-catcher\/","title":{"rendered":"SOUND CATCHER"},"content":{"rendered":"[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.16&#8243; background_color=&#8221;#fff0d9&#8243; background_enable_image=&#8221;off&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row admin_label=&#8221;Main heading&#8221; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_heading title=&#8221;SOUND CATCHER&#8221; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;c9a4dd29-8345-43ea-bd4d-e73ae35e5717&#8243; global_colors_info=&#8221;{}&#8221;][\/et_pb_heading][et_pb_text _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;e179c0c4-c115-407d-a110-ebe813713cd6&#8243; custom_padding=&#8221;|90px||90px|false|false&#8221; custom_padding_tablet=&#8221;|20px||20px|false|false&#8221; custom_padding_phone=&#8221;|0px||0px|false|false&#8221; custom_padding_last_edited=&#8221;on|tablet&#8221; hover_enabled=&#8221;0&#8243; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]<p style=\"text-align: center;\"><strong>Use a satellite dish to discuss secret matters with a friend.<\/strong><\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; use_custom_gutter=&#8221;on&#8221; gutter_width=&#8221;1&#8243; make_equal=&#8221;on&#8221; admin_label=&#8221;Card Image Right&#8221; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#FFFFFF&#8221; custom_margin=&#8221;25px||25px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; border_radii=&#8221;on|20px|20px|20px|20px&#8221; global_colors_info=&#8221;{}&#8221; custom_css_main_element_last_edited=&#8221;on|tablet&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|30px||30px|false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;e179c0c4-c115-407d-a110-ebe813713cd6&#8243; custom_margin=&#8221;|0px|||false|false&#8221; custom_padding=&#8221;60px||30px|0px|false|false&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;]Even the ancient Greeks new  it was possible to focus light into a narrow beam using a parabolic mirror. Applying the same operating principle to frequencies, the physicist Heinrich Rudolf Hertz built the world\u2019s first parabolic antenna in 1888. Using two such antennae, Hertz was able to prove the existence of radio waves. Hertz\u2019s invention was a breakthrough in the history of communication.\n\nYou can see how sound waves are focused using large parabolic dishes when you and your friend stand on either side. The bowl-shaped device enables you to have a conversation without seeing each other and without anyone else hearing.[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_image src=&#8221;https:\/\/www.prototehas.ee\/wp-content\/uploads\/2024\/05\/pildid_veebi_519x519px45.png&#8221; alt=&#8221;R\u00e4\u00e4gi salajutte helide p\u00fc\u00fcdja abil&#8221; title_text=&#8221;Helide p\u00fc\u00fcdja&#8221; show_bottom_space=&#8221;off&#8221; module_class=&#8221;pa-full-height-image-column&#8221; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; height=&#8221;100%&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;1_2,1_2&#8243; use_custom_gutter=&#8221;on&#8221; gutter_width=&#8221;2&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; width=&#8221;95%&#8221; custom_margin=&#8221;||||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_blurb title=&#8221;Type of invention&#8221; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;481f6fb3-e1ad-4711-b65b-226135c026c0&#8243; global_colors_info=&#8221;{}&#8221;]<p>Hands on<\/p>[\/et_pb_blurb][et_pb_blurb title=&#8221;Difficulty level&#8221; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;481f6fb3-e1ad-4711-b65b-226135c026c0&#8243; custom_margin=&#8221;||||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<p>Easy<\/p>[\/et_pb_blurb][\/et_pb_column][et_pb_column type=&#8221;1_2&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_blurb title=&#8221;DuraTION&#8221; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;481f6fb3-e1ad-4711-b65b-226135c026c0&#8243; custom_margin=&#8221;||||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<p>1 min<\/p>[\/et_pb_blurb][et_pb_blurb title=&#8221;Score calculation&#8221; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;481f6fb3-e1ad-4711-b65b-226135c026c0&#8243; custom_margin=&#8221;30px||25px||false|false&#8221; global_colors_info=&#8221;{}&#8221;]<p>No<\/p>[\/et_pb_blurb][\/et_pb_column][\/et_pb_row][\/et_pb_section]<span class=\"et_bloom_bottom_trigger\"><\/span>","protected":false},"excerpt":{"rendered":"<p>Use a satellite dish to discuss secret matters with a friend.Even the ancient Greeks new it was possible to focus light into a narrow beam using a parabolic mirror. Applying the same operating principle to frequencies, the physicist Heinrich Rudolf Hertz built the world\u2019s first parabolic antenna in 1888. Using two such antennae, Hertz was [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","inline_featured_image":false,"footnotes":""},"class_list":["post-2683","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SOUND CATCHER - Elamuskeskus - PROTO avastustehas<\/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.prototehas.ee\/en\/sound-catcher\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SOUND CATCHER - Elamuskeskus - PROTO avastustehas\" \/>\n<meta property=\"og:description\" content=\"Use a satellite dish to discuss secret matters with a friend.Even the ancient Greeks new it was possible to focus light into a narrow beam using a parabolic mirror. 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