{"id":23105088,"url":"https://github.com/shamazmazum/cl-wavelets","last_synced_at":"2026-03-20T00:36:56.997Z","repository":{"id":37456945,"uuid":"231539628","full_name":"shamazmazum/cl-wavelets","owner":"shamazmazum","description":"Wavelet transform library","archived":false,"fork":false,"pushed_at":"2022-06-23T05:31:35.000Z","size":722,"stargazers_count":2,"open_issues_count":1,"forks_count":0,"subscribers_count":3,"default_branch":"master","last_synced_at":"2025-02-09T10:11:18.369Z","etag":null,"topics":["dwt","pwt","wavelet-transform"],"latest_commit_sha":null,"homepage":null,"language":"Common Lisp","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"bsd-2-clause","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/shamazmazum.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null}},"created_at":"2020-01-03T07:51:52.000Z","updated_at":"2022-02-20T16:18:35.000Z","dependencies_parsed_at":"2022-08-19T19:40:44.026Z","dependency_job_id":null,"html_url":"https://github.com/shamazmazum/cl-wavelets","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/shamazmazum%2Fcl-wavelets","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/shamazmazum%2Fcl-wavelets/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/shamazmazum%2Fcl-wavelets/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/shamazmazum%2Fcl-wavelets/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/shamazmazum","download_url":"https://codeload.github.com/shamazmazum/cl-wavelets/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":247086024,"owners_count":20881160,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["dwt","pwt","wavelet-transform"],"created_at":"2024-12-17T00:37:49.102Z","updated_at":"2026-01-16T04:59:20.032Z","avatar_url":"https://github.com/shamazmazum.png","language":"Common Lisp","funding_links":[],"categories":[],"sub_categories":[],"readme":"cl-wavelets\n===========\n[![Build Status](https://api.cirrus-ci.com/github/shamazmazum/cl-wavelets.svg)](https://cirrus-ci.com/github/shamazmazum/cl-wavelets)\n![CI](https://github.com/shamazmazum/cl-wavelets/workflows/CI/badge.svg)\n\n**cl-wavelets** is a library with a set of algorithms related to\nvarious kinds of wavelet transform. Currently they all work with\narrays of type `(simple-array (signed-byte 32) (*))` (i.e. they are\n1D). This makes this library suitable for audio processing and\ncompression. For more info visit the project page\n[here](http://shamazmazum.github.io/cl-wavelets).\n\nCurrently supported algorithms:\n* DWT\n* Frequency analysis using PWT.\n* Best-basis PWT.\n\nCurrently supported wavelets:\n* Haar wavelet\n* CDF (2,2) wavelet\n* CDF (3,1) wavelet\n* CDF (4,2) wavelet\n\n### Usage\n\nIn examples:\n~~~~\n(wavelets:dwt (make-array 8\n                          :element-type     '(signed-byte 32)\n                          :initial-contents '(0 1 2 3 4 5 7 8))\n              :wavelet        :cdf-2-2\n              :boundary-style :mirror)\n#(2 4 0 3 0 0 0 1)\n\n(wavelets:dwt-inverse *\n                      :wavelet        :cdf-2-2\n                      :boundary-style :mirror)\n#(0 1 2 3 4 5 7 8)\n~~~~\n\nGenerally, there are two kinds of functions: with `!` at the end and without\n`!`. Whose with `!` are in-place functions, in other words they modify their\nfirst argument. Whose without `!` do not modify their first argument.\n\nFor more info, generate a documentation with **codex** like so:\n`codex:document :cl-wavelets :skip-unsocumented t`.\n\n### Examples package\n\nYou can load `cl-wavelets/examples` system which contains packages to\ndemonstrate some components of this library. For example, you can\nbuild a spectrogram of an uncompressed WAV file making use of\n`wavelets:frequency-domain` function. To build a spectrogram, try this:\n~~~~\n(wavelets-spectrogram:spectrogram \"/path/to/audio.wav\"\n                                  \"/path/to/spectrogram.jpg\")\n~~~~\nThis will produce `spectrogram.jpg` image with the spectrogram. Note,\nthat the time axis is the vertical one, with the time going\nup-down. This is a spectrogram rotated by 90 degrees clockwise,\nactually. Also, the quality of the spectrogram will be much worse\ncompared to the qualily of a spectrogram obtained via FFT. This is\nbecause the filters used in the process are far from ideal.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fshamazmazum%2Fcl-wavelets","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fshamazmazum%2Fcl-wavelets","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fshamazmazum%2Fcl-wavelets/lists"}