{"id":8131,"date":"2019-11-21T17:28:15","date_gmt":"2019-11-21T16:28:15","guid":{"rendered":"https:\/\/demdlx704as001.ad.harman.com\/?p=8131&preview=true&preview_id=8131"},"modified":"2019-11-21T17:29:23","modified_gmt":"2019-11-21T16:29:23","slug":"vnc-ala-reference-project-signal-flow-and-operation-2","status":"publish","type":"post","link":"https:\/\/audioworx.transfunnel.co\/old\/?p=8131","title":{"rendered":"General Operation of ALA"},"content":{"rendered":"
<\/div>\n

The ALA section of the project attempts to automatically regulate the subjective loudness level of the input to a tuned, consistent level using a single gain stage and several input variables. Real-time gain regulation is calculated by the AlaControl <\/span>and CompanderALA<\/span> objects and gain is applied using the ALAgain<\/span> object. It considers these input variables:<\/p>\n

Input signal perceptual level<\/p>\n

Current speed<\/p>\n

Current entertainment volume setting<\/p>\n

Tuned LUT’s which condition the control input signals<\/p>\n

Current signal-to-noise in the cabin as computed by the NoiseEst<\/span> object<\/p>\n

 <\/p>\n

The ALA section of the project operates in the following way:<\/p>\n

The Merger<\/span> object passes a combined (mono) signal to the CompanderALA<\/span> object<\/p>\n

The signal is band-passed first by the BiquadsPreFilter<\/span> object<\/p>\n

The CompanderALA<\/span> object computes a final gain value to send to the ALAgain<\/span> object, based on current signal level plus input from the AlaControl<\/span> object<\/p>\n

The NoiseEst<\/span> object generates a measure of signal-to-noise ratio using a cabin microphone signal compared with current entertainment audio<\/p>\n

The AlaControl<\/span> object receives control signals from the LUT’s and NoiseEst<\/span> and regulates the CompanderALA<\/span> object accordingly<\/p>\n

The ALAgain<\/span> object applies the final gain value to the input signal<\/p>\n

The CompanderLevel<\/span> object is a level monitor which allows the user to monitor the ALA gain<\/p>\n","protected":false},"excerpt":{"rendered":"

The ALA section of the project attempts to automatically regulate the subjective loudness level of the input to a tuned, consistent level using a single gain stage and several input variables. Real-time gain regulation is calculated by the AlaControl and CompanderALA objects and gain is applied using the ALAgain object. It considers these input variables: […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","footnotes":"","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"off","ocean_gallery_id":[]},"categories":[3,7,88,12,5],"tags":[189],"coauthors":[165],"_links":{"self":[{"href":"https:\/\/audioworx.transfunnel.co\/old\/index.php?rest_route=\/wp\/v2\/posts\/8131"}],"collection":[{"href":"https:\/\/audioworx.transfunnel.co\/old\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/audioworx.transfunnel.co\/old\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/audioworx.transfunnel.co\/old\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/audioworx.transfunnel.co\/old\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8131"}],"version-history":[{"count":1,"href":"https:\/\/audioworx.transfunnel.co\/old\/index.php?rest_route=\/wp\/v2\/posts\/8131\/revisions"}],"predecessor-version":[{"id":8132,"href":"https:\/\/audioworx.transfunnel.co\/old\/index.php?rest_route=\/wp\/v2\/posts\/8131\/revisions\/8132"}],"wp:attachment":[{"href":"https:\/\/audioworx.transfunnel.co\/old\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8131"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/audioworx.transfunnel.co\/old\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8131"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/audioworx.transfunnel.co\/old\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8131"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/audioworx.transfunnel.co\/old\/index.php?rest_route=%2Fwp%2Fv2%2Fcoauthors&post=8131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}