{"id":6783,"date":"2025-06-13T21:15:08","date_gmt":"2025-06-13T19:15:08","guid":{"rendered":"https:\/\/www.pschatzmann.ch\/home\/?p=6783"},"modified":"2025-06-16T05:01:06","modified_gmt":"2025-06-16T03:01:06","slug":"arduino-audio-tools-pinping-up-resampling","status":"publish","type":"post","link":"https:\/\/www.pschatzmann.ch\/home\/2025\/06\/13\/arduino-audio-tools-pinping-up-resampling\/","title":{"rendered":"Arduino Audio Tools: Pimping Up Resampling"},"content":{"rendered":"

The ResampleStream<\/a> class of the Arduino Audio Tools<\/a> project provides some flexible resampling functionality both on the input and the output side. To calculate the values it just uses a simple but efficient linear interpolation<\/strong>.<\/p>\n

I finally managed to provide an extended ResampleStreamT<\/a> resampling class that uses some alternative interpolation method implementations<\/a>:<\/p>\n\nHere is an overview with the advantages and disadvantages: <\/p>\n\n\n\n\n\n\n\n\n\n
Method<\/th>\nQuality<\/th>\nCPU Cost<\/th>\nArtifacts<\/th>\nInterpolates Sample Points<\/th>\n<\/tr>\n<\/thead>\n
Linear<\/td>\nLow<\/td>\nVery Low<\/td>\nHigh<\/td>\nYes<\/td>\n<\/tr>\n
B-Spline (Cubic)<\/td>\nModerate<\/td>\nMedium<\/td>\nLow<\/td>\nNo<\/td>\n<\/tr>\n
Lagrange (Order 3)<\/td>\nHigh (order-dependent)<\/td>\nHigh<\/td>\nModerate (oscillation)<\/td>\nYes<\/td>\n<\/tr>\n
Cubic Hermite<\/td>\nHigh<\/td>\nMedium<\/td>\nLow<\/td>\nYes<\/td>\n<\/tr>\n
Parabolic (Quadratic)<\/td>\nModerate<\/td>\nLow<\/td>\nModerate<\/td>\nYes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n

Further information can be found in the Resampling Wiki<\/a>!<\/p>\n","protected":false},"excerpt":{"rendered":"

The ResampleStream class of the Arduino Audio Tools project provides some flexible resampling functionality both on the input and the output side. To calculate the values it just uses a simple but efficient linear interpolation. I finally managed to provide an extended ResampleStreamT resampling class that uses some alternative interpolation […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[20,22],"tags":[],"class_list":["post-6783","post","type-post","status-publish","format-standard","hentry","category-arduino","category-machine-sound"],"yoast_head":"\nArduino Audio Tools: Pimping Up Resampling - Phil Schatzmann<\/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.pschatzmann.ch\/home\/2025\/06\/13\/arduino-audio-tools-pinping-up-resampling\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Arduino Audio Tools: Pimping Up Resampling - Phil Schatzmann\" \/>\n<meta property=\"og:description\" content=\"The ResampleStream class of the Arduino Audio Tools project provides some flexible resampling functionality both on the input and the output side. 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