{"id":4157,"date":"2021-04-30T07:05:11","date_gmt":"2021-04-30T07:05:11","guid":{"rendered":"http:\/\/procedural-audio.com\/blog\/?p=4157"},"modified":"2022-01-06T09:45:44","modified_gmt":"2022-01-06T09:45:44","slug":"creative-use-of-doppler","status":"publish","type":"post","link":"http:\/\/procedural-audio.com\/blog\/2021\/04\/30\/creative-use-of-doppler\/","title":{"rendered":"Creative use of Doppler"},"content":{"rendered":"
\n\"KevinDoran\"\n<\/div>\n
\n\"ShintaroTakemoto\"\n<\/div>\n

\nIf you have ever experienced a car rushing by you, you will already have a good idea of what Doppler is. If you are unfamiliar with the word, Doppler refers to the perceived pitch change as an object rushes by a listener. The sound will appear to pitch up as it gets near and pitch down as it drifts away.\n<\/p>\n

\nThe Doppler<\/b> module of GameSynth’s patching environment allows us to mimic this effect by setting the sound source\u2019s distance and velocity. This effect is quite unique in that it is a one-shot effect, and it can be reset via its trigger input. Once the effect has pitched and faded out, it won\u2019t automatically start by itself.\n<\/p>\n

Simple Doppler<\/h2>\n

\nThe simplest use-case for this effect is the most obvious – creating a car driving by. Since we have designed a highly-customizable engine sound in a different blog, we have used that as our source thanks to the Patch Player<\/strong> module. Next, we use Doppler<\/b> to quickly create our pitch shift effect. To sell the effect further, we have created Gain<\/b> and Panner<\/b> effects modulated via a couple of Envelopes. By matching all our effects together, the final patch is light-weight but very convincing!<\/p>\n


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Magical Marble Machine<\/h2>\n

\nIn a previous blog<\/a>, we showcased a procedural debris generator that synthesized up some satisfying gravelly textures. We revisited that patch, swapped out the Impact<\/b> module for some Bullet Casings<\/b>, and added a Doppler<\/b> effect to the chain. Since certain cartridge<\/i> types produce pitched tonal clattering, the pitch shifting is distinct and characterful. <\/p>\n

\nAlthough the Doppler<\/b> in this patch isn\u2019t explicitly used to mimic motion, it is still a neat effect for creative sound design purposes.<\/p>\n


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Water Surf<\/h2>\n

\nIn this patch, we use Doppler<\/b> to imply motion, but not of a fast object rushing by. Instead, we can use it to create the froth of a wave\u2019s surf.<\/p>\n

\nThe Hail<\/b> and Fracture<\/b> sources give the sound its distinct textural character, and the Goo<\/b> and Granular Noise<\/b> sources give the sound its frothiness. The Hail<\/b> is first Ring Modulated by a Random signal shape<\/i> (aka noise) to help soften it. All of the sources are then mixed and Doppler-shifted to give it that distinct pitch sweep effect. By keeping all the generators on infinite Duration, we can use the Clock<\/b> to retrigger the effect for a rhythmic pattern that matches a tidal ebb and flow.\n<\/p>\n

\nSaturator<\/b> and Chorus<\/b> modules help to bring out the high end and thicken the overall sound. Since the Doppler<\/b> shifting can lead to excessive bass, using a Biquad<\/b> around 40Hz prevents too sub-frequency build-up. Then a touch of EQ<\/b> is used to accentuate the high-end even more for the perfect mix.\n<\/p>\n


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Anime swish<\/h2>\n

\nIn our previous blog<\/a>, we recreated a typical Japanese anime swish sound by drawing its movements in the Sketch Pad<\/strong> module.<\/p>\n

Below is another implementation of this sound effect, which after creating the initial metallic timbre with Gear <\/strong>and Clang <\/strong>generators sent through Spectral Delays<\/strong>, uses a Doppler <\/strong>module to add movement to the sound.<\/p>\n

The sound is then made low-fi with a Saturator <\/strong>and a Degrader<\/strong>, before going through a Delay <\/strong>and an EQ (5 bands)<\/strong>.<\/p>\n


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\n\"download-patches\"
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\n\"GameSynth\"
\n<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

If you have ever experienced a car rushing by you, you will already have a good idea of what Doppler is. If you are<\/p>\n","protected":false},"author":1,"featured_media":4170,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[6,15,12],"tags":[],"_links":{"self":[{"href":"http:\/\/procedural-audio.com\/blog\/wp-json\/wp\/v2\/posts\/4157"}],"collection":[{"href":"http:\/\/procedural-audio.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/procedural-audio.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/procedural-audio.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/procedural-audio.com\/blog\/wp-json\/wp\/v2\/comments?post=4157"}],"version-history":[{"count":18,"href":"http:\/\/procedural-audio.com\/blog\/wp-json\/wp\/v2\/posts\/4157\/revisions"}],"predecessor-version":[{"id":4899,"href":"http:\/\/procedural-audio.com\/blog\/wp-json\/wp\/v2\/posts\/4157\/revisions\/4899"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/procedural-audio.com\/blog\/wp-json\/wp\/v2\/media\/4170"}],"wp:attachment":[{"href":"http:\/\/procedural-audio.com\/blog\/wp-json\/wp\/v2\/media?parent=4157"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/procedural-audio.com\/blog\/wp-json\/wp\/v2\/categories?post=4157"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/procedural-audio.com\/blog\/wp-json\/wp\/v2\/tags?post=4157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}