Macuna Speech Recognition: AI Transcription for an Endangered Tukanoan Language

Macuna (also known as Máhkuna) is a Tukanoan language spoken in the border region between Colombia and Brazil, primarily along the Apaporis and Uaupés rivers. With only about 2,000 speakers, it is considered endangered. The language features a complex tonal system, nasal harmony, and a rich oral tradition of myths and rituals that have been passed down for generations.

Why Accurate Speech-to-Text Matters for Macuna

For a language with such a small speaker population, every recorded word holds cultural and scientific value. Linguists, anthropologists, and community leaders are increasingly turning to speech-to-text technology to transcribe interviews, chants, and everyday conversations. Accurate transcription enables:

• Preservation of vanishing knowledge for future generations
• Creation of educational materials in Macuna
• Subtitle generation for documentaries and community videos
• Linguistic research on tone and grammar
• Accessibility for hearing-impaired community members

Challenges in Macuna Transcription

Macuna presents several unique challenges for automatic speech recognition:

• Tonal distinctions: Words like báh (father) vs. bah (a plant) are differentiated only by pitch. The ASR model must capture tone to avoid ambiguity.
• Nasalization: Nasal vowels (ã, ẽ, ĩ, õ, ũ, ɨ̃) are common and must be represented correctly in text.
• Limited training data: With fewer than 2,000 speakers, very little transcribed audio exists. Speechyou uses transfer learning and data augmentation to build a robust model from scarce samples.
• Code-switching: Many Macuna speakers also use Spanish or Portuguese, especially for modern concepts. The system must handle mixed-language utterances.

How Speechyou Handles Macuna

Speechyou's Macuna model is trained on a curated dataset of field recordings from the Vaupés region, with tone marks verified by native speakers. The output uses the standard Latin-based orthography with diacritics, and post-editing is supported via the browser editor or API. Users can also add custom vocabulary for clan names, ceremonial terms, or local place names.

Use Cases in Practice

• Oral history preservation: A community project in the Mirití-Paraná area records elders' life stories and uses Speechyou to generate text for bilingual booklets.
• Educational subtitling: Schools in the Bacati municipality create Macuna-subtitled videos for children learning to read in their native language.
• Linguistic fieldwork: PhD students transcribe field recordings in 50% of the time compared to manual methods.
• Health communications: Health workers translate prenatal care messages into Macuna and use speech-to-text to record patient responses.

The Future of Macuna Language Technology

As more Macuna speakers use digital devices, the demand for language technology will grow. Speechyou is committed to supporting Macuna with ongoing model updates and community feedback integration. The Unlimited transcription included in the Solo plan makes it accessible to non-profits and individual researchers. Together, we can help keep the Macuna language alive in the digital age.

To start transcribing Macuna audio, upload your file or record directly on the Speechyou dashboard. Your text can be exported as plain text, SRT, or VTT subtitles in seconds.