{"id":930,"date":"2025-09-05T12:29:07","date_gmt":"2025-09-05T03:29:07","guid":{"rendered":"https:\/\/acoustic-measurement.com\/?post_type=technology&#038;p=930"},"modified":"2025-08-26T12:37:03","modified_gmt":"2025-08-26T03:37:03","slug":"mapping-the-directionality-of-acoustic-devices","status":"publish","type":"technology","link":"https:\/\/acoustic-measurement.com\/en\/technology\/mapping-the-directionality-of-acoustic-devices\/","title":{"rendered":"Mapping the Directionality of Acoustic Devices \u2014 Directivity Measurement with HBK Microphones, Turntable, and AEB \u2014"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction: What Is \u201cDirectivity\u201d in a Speaker?<\/h2>\n\n\n\n<p>Not all sounds radiate evenly in all directions.<br>Speakers, buzzers, microphones, and ultrasonic emitters often exhibit <strong>direction-dependent output levels<\/strong>, especially at mid to high frequencies.<\/p>\n\n\n\n<p>Understanding their <strong>acoustic directivity<\/strong> is crucial for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Optimizing orientation<\/strong> in real-world installations (e.g. automotive, public address)<\/li>\n\n\n\n<li><strong>Reducing unwanted noise exposure<\/strong> to neighboring systems<\/li>\n\n\n\n<li><strong>Enhancing clarity and intelligibility<\/strong> in directional communication devices<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Measurement Challenges: Precision and Acoustic Control Required<\/h2>\n\n\n\n<p>Evaluating directivity demands:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A <strong>reflection-free space<\/strong> to avoid environmental bias<\/li>\n\n\n\n<li><strong>Controlled rotation<\/strong> of the DUT (Device Under Test) or microphone<\/li>\n\n\n\n<li><strong>Fine angular resolution<\/strong> across relevant frequency ranges<\/li>\n<\/ul>\n\n\n\n<p>Combining a compact <strong>Anechoic Box (AEB)<\/strong> with an <strong>automated turntable and HBK microphones<\/strong> provides a practical and accurate solution.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Example Setup: AEB \u00d7 Turntable \u00d7 HBK Measurement Chain<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"tableSmall\"><thead><tr><th>Component<\/th><th>Function<\/th><\/tr><\/thead><tbody><tr><th>Acoustic Environment<\/th><td>AEB: Compact anechoic box isolating free-field acoustic behavior<\/td><\/tr><tr><th>Rotating Platform<\/th><td>Electric turntable with programmable angle steps and speed<\/td><\/tr><tr><th>Microphone System<\/th><td>HBK Free-Field Mic + LAN-XI module<\/td><\/tr><tr><th>Software<\/th><td>BK Connect: Real-time polar plotting and frequency-band analysis<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Types of Analysis and Output<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Polar plots (SPL vs angle)<\/strong> by frequency band<\/li>\n\n\n\n<li>Beamwidth and directivity index calculations<\/li>\n\n\n\n<li>Comparison of patterns across different designs or production batches<\/li>\n\n\n\n<li>Asymmetry or lobing detection<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Ideal Test Targets<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Directional speakers, wearable speakers, soundbars<\/li>\n\n\n\n<li>Voice guidance devices and alerting units<\/li>\n\n\n\n<li>Ultrasonic transducers and beamforming elements<\/li>\n\n\n\n<li>Microphones and communication headsets with pickup pattern tuning<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><strong>Why AEB + HBK Is a Winning Combination<\/strong><\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>AEB<\/strong> eliminates internal reflections for true free-field testing<\/li>\n\n\n\n<li><strong>HBK microphones<\/strong> ensure calibrated, broadband response<\/li>\n\n\n\n<li><strong>BK Connect<\/strong> synchronizes rotation angles with real-time acoustic capture<\/li>\n\n\n\n<li>Compact, repeatable, and scalable setup for lab or QA use<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><strong>Customization &amp; Consultation<\/strong><\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>AEB design tailored to DUT size and accessibility<\/li>\n\n\n\n<li>Turntable selection based on angular resolution and load capacity<\/li>\n\n\n\n<li>DUT fixture design and microphone positioning tools<\/li>\n\n\n\n<li>Support for test standard compliance or custom reporting<\/li>\n<\/ul>\n\n\n\n<p>\u25b6 <strong>[<a href=\"https:\/\/acoustic-measurement.com\/en\/contact\/\"><strong><strong>Contact Moritani for Directivity Testing Solutions<\/strong><\/strong><\/a>]<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction: What Is \u201cDirectivity\u201d in a Speaker? Not all sounds radiate evenly in all directions.Speakers, buzzers, microphones, and ultrasonic emitters often exhibit direction-dependent output levels, especially at mid to high frequencies. Understanding their acoustic directivity is crucial for: Measurement Challenges: Precision and Acoustic Control Required Evaluating directivity demands: Combining a compact Anechoic Box (AEB) with [&hellip;]<\/p>\n","protected":false},"featured_media":0,"parent":0,"template":"","solution_cat":[4],"class_list":["post-930","technology","type-technology","status-publish","hentry","solution_cat-tax_aeb","en-US"],"acf":[],"_links":{"self":[{"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/technology\/930","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/technology"}],"about":[{"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/types\/technology"}],"wp:attachment":[{"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/media?parent=930"}],"wp:term":[{"taxonomy":"solution_cat","embeddable":true,"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/solution_cat?post=930"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}