{"id":1229,"date":"2025-12-07T08:52:53","date_gmt":"2025-12-07T06:52:53","guid":{"rendered":"https:\/\/lz2jr.com\/blog\/?p=1229"},"modified":"2025-12-14T21:50:11","modified_gmt":"2025-12-14T19:50:11","slug":"v6-dsp-audio-filter-board","status":"publish","type":"post","link":"https:\/\/lz2jr.com\/blog\/index.php\/v6-dsp-audio-filter-board\/","title":{"rendered":"V6 DSP audio filter board"},"content":{"rendered":"\n<p>Audio filter (AF) option is a small board located on IF\/AF board. Here are some of the new AF (audio filter) option features:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Digital signal processing (DSP) architecture based on ADI Sigma studio chip.<\/li><li>12 low pass and 7 high pass high order (6th order) filters automatically selected by the software . Audio filter bandwidth follows current IF bandwidth and pitch on CW.  If narrow filter Jones &#8211; 4 pole is engaged and in line firmware adjusts LPF and HPF frequencies accordingly.(BW position B01 &#8211; B10 and OFF)<\/li><li>APF &#8211; audio peak filter feature. This is high Q parametric filter resonating at pitch frequency (\u00b130Hz). It boosts up received signal with three adjustable levels &#8211; 8db 10db and 12db. Can be switched off and on. APF makes faint signals popping up well on the noise level.<\/li><li>NR noise reduction function based on ADI noise removal digital algorithm. Adjustable level of action.<\/li><li>NOTCH\/AUTONOTCH  function &#8211; works according to the bandwidth in use. AUTONOTCH works only for BW&lt;1200Hz. Manual NOTCH frequency is adjusted by rotating ENC.3 RIT\/XIT. AUTONOTCH feature is activated by long press of ENC.3 button.<\/li><li>CW TUNE \/ AUTOTUNE. This is useful CW aid function for ZERO beat or CW pitch match tuning. RIT\/XIT LED glows\/flickers in green when the pitch frequency locks. Short click on ENC.3 (RIT\/XIT) initiates auto tune procedure which takes a second to tune the frequency to received CW signal. Auto tune won&#8217;t work if the signal is more than \u00b1100Hz away from current VFO frequency. Weak signals  bellow -121dBm won&#8217;t trigger CW autotuner.<\/li><\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Audio filter (AF) option is a small board located on IF\/AF board. Here are some of the new AF (audio filter) option features: Digital signal processing (DSP) architecture based on ADI Sigma studio chip. 12 low pass and 7 high<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1229","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/1229","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=1229"}],"version-history":[{"count":4,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/1229\/revisions"}],"predecessor-version":[{"id":1234,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/1229\/revisions\/1234"}],"wp:attachment":[{"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=1229"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=1229"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=1229"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}