{"id":26776756,"url":"https://github.com/annaobara/buchla-259-wavefolder","last_synced_at":"2026-03-04T22:01:54.546Z","repository":{"id":281866724,"uuid":"946680543","full_name":"annaobara/Buchla-259-Wavefolder","owner":"annaobara","description":"MATLAB implementation of the Buchla 259 wavefolder with anti-aliasing techniques using polyBLAMP","archived":false,"fork":false,"pushed_at":"2025-03-27T16:31:21.000Z","size":566,"stargazers_count":0,"open_issues_count":0,"forks_count":0,"subscribers_count":1,"default_branch":"main","last_synced_at":"2025-03-27T17:32:07.788Z","etag":null,"topics":["anti-aliasing","audio-dsp","buchla","matlab","polyblamp","signal-processing","synthesis","wavefolder"],"latest_commit_sha":null,"homepage":"","language":"MATLAB","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/annaobara.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,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2025-03-11T14:11:09.000Z","updated_at":"2025-03-27T16:31:25.000Z","dependencies_parsed_at":"2025-03-18T19:30:29.382Z","dependency_job_id":null,"html_url":"https://github.com/annaobara/Buchla-259-Wavefolder","commit_stats":null,"previous_names":["annaobara/buchla-259-wavefolder"],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/annaobara%2FBuchla-259-Wavefolder","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/annaobara%2FBuchla-259-Wavefolder/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/annaobara%2FBuchla-259-Wavefolder/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/annaobara%2FBuchla-259-Wavefolder/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/annaobara","download_url":"https://codeload.github.com/annaobara/Buchla-259-Wavefolder/tar.gz/refs/heads/main","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":246137336,"owners_count":20729343,"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":["anti-aliasing","audio-dsp","buchla","matlab","polyblamp","signal-processing","synthesis","wavefolder"],"created_at":"2025-03-29T04:23:56.350Z","updated_at":"2026-03-04T22:01:54.539Z","avatar_url":"https://github.com/annaobara.png","language":"MATLAB","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Virtual Buchla 259 Wavefolder - Digital Modeling and DSP Implementation  \n\nThis project digitally models the **Buchla 259 Wavefolder**, a nonlinear waveshaping circuit used in **West Coast synthesis**. The implementation focuses on **real-time DSP processing** while mitigating aliasing artifacts using the **polyBLAMP (band-limited ramp) technique**.  \n\nThis work is based on **virtual analog modeling** principles and was developed in **MATLAB**.  \n\n---\n\n## Project Overview  \n\nThe **Buchla 259 Wavefolder** is an essential component of West Coast synthesis, known for its **nonlinear wavefolding** that introduces rich harmonic content. This project aims to:  \n\n- **Digitally model** the Buchla 259 circuit while preserving its timbral characteristics  \n- **Analyze the spectral response** and minimize aliasing artifacts  \n- **Implement polyBLAMP** as an efficient anti-aliasing technique  \n- **Evaluate the digital model** against theoretical benchmarks and analog simulations\n\n---\n\n## Features  \n- MATLAB-based real-time signal processing\n- Anti-aliasing using **polyBLAMP** (Polynomial Band-Limited Step)\n- Nonlinear folding via memoryless functions\n- Resistor-weighted voltage summation\n- Spectral validation via FFT and spectrograms\n- Designed for use in virtual modular synthesis and software synthesizers\n\n---\n\n## Techniques Used\n\n- Memoryless nonlinear shaping functions based on the methodology of **Esqueda et al. (DAFx-17)**\n- Resistor network emulation with precomputed scalar coefficients\n- Fractional delay analysis for sample-accurate alias suppression\n- Symmetrical inverse clipping\n- Global signal summation with dynamic scaling\n\n---\n\n## Installation\n1. **Clone the repository**:  \n   ```bash\n   git clone https://github.com/annaobara/Buchla-259-Wavefolder.git\n   cd Buchla-259-Wavefolder\n\n---\n\n## Repository Structure\n\n```\n📁 docs/             → Final project report (PDF)\n📁 src/              → MATLAB implementation files\n📁 images/           → Output figures (spectrograms, waveform plots)\n📁 tests/            → Example/test scripts\n📁 examples/         → Audio demos\n```\n\n---\n\n## Spectral Analysis\n\nThe model was tested with sinusoidal inputs. Results showed significantly reduced aliasing and preserved harmonic structures when compared to uncorrected models.\n\n\u003e ![Spectrogram](images/spectrogram.jpg)\n\n---\n\n## Requirements\n\n- MATLAB R2022b or later  \n- Signal Processing Toolbox  \n\n---\n\n## License\n\nLicensed under the MIT License. See [`LICENSE`](LICENSE) for details.\n\n---\n\n## Documentation\n\n[Read full project report](docs/DSP_2024_fall.pdf)\n\n---\n\n## Reference\n\nEsqueda, F., Pöntynen, H., Välimäki, V., \u0026 Parker, J. D. (2017). *Virtual Analog Buchla 259 Wavefolder*. In **Proceedings of the 20th International Conference on Digital Audio Effects (DAFx-17)**.\n\n---\n\nDeveloped by [Anna Obara](https://github.com/annaobara) • Aalborg University, 2025\n\n \n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fannaobara%2Fbuchla-259-wavefolder","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fannaobara%2Fbuchla-259-wavefolder","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fannaobara%2Fbuchla-259-wavefolder/lists"}