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Junco v0.1

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+ Junco v0.1 (flockspeech/junco)
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+ Copyright 2026 Flock Speech
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+
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+ Licensed under the Apache License, Version 2.0 (see LICENSE). This covers the Junco acoustic model weights
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+ (onnx/encoder.onnx, onnx/decoder-int8.onnx) and the model configuration (onnx/junco.json).
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+
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+ Third-party components:
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+
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+ - Vocos vocoder (onnx/vocoder.onnx): converted from charactr/vocos-mel-24khz,
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+ Copyright (c) 2023 Charactr Inc., MIT License (see onnx/LICENSE-vocos).
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+ - Training data: LJ Speech Dataset (Keith Ito and Linda Johnson), public domain.
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+
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+ Not included, required at run time to turn text into phonemes:
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+
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+ - espeak-ng (GPL-3.0) and phonemizer (GPL-3.0). The flockspeech pip package installs them as separate
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+ dependencies.
README.md ADDED
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+ ---
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+ license: apache-2.0
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+ language:
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+ - en
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+ library_name: onnx
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+ pipeline_tag: text-to-speech
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+ tags:
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+ - text-to-speech
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+ - tts
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+ - speech-synthesis
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+ - neural-tts
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+ - offline-tts
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+ - on-device
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+ - edge-ai
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+ - edge
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+ - offline
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+ - cpu
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+ - onnx
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+ - onnxruntime
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+ - lightweight
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+ - small-model
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+ - vocos
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+ - english
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+ - raspberry-pi
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+ - flockspeech
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+ - accessibility
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+ - screen-reader
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+ - voice-assistant
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+ - narration
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+ datasets:
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+ - keithito/lj_speech
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+ ---
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+
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+ # Junco v0.1: tiny offline text-to-speech (TTS) for CPU
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+
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+ **A small, natural English text-to-speech model that runs offline on any CPU. 44 MB, no GPU, no cloud.**
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+
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+ Junco is an 11.4M-parameter text-to-speech model from [Flock Speech](https://huggingface.co/flockspeech). It turns
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+ English text into natural 24 kHz speech on an ordinary CPU, faster than real time. It has no GPU, network or PyTorch
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+ dependency, and the full model is a 44 MB download.
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+
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+ Junco is the clear, neutral **reading voice** of the Flock Speech family: a good fit for voice assistants, screen
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+ readers, notifications, narration and other on-device or edge AI speech output. Install it with
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+ `pip install flockspeech`.
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+
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+ | Flock Speech voices | Style | Model card |
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+ |---|---|---|
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+ | **Junco** | clear, neutral reading voice | this page |
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+ | **Goldfinch** | conversational voice that laughs and breathes on cue with `[laugh]` tags | [flockspeech/goldfinch](https://huggingface.co/flockspeech/goldfinch) |
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+
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+ | | |
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+ |---|---|
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+ | **Developed by** | Flock Speech |
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+ | **Model type** | Neural text-to-speech: compact acoustic model + Vocos vocoder |
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+ | **Language** | English (US) |
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+ | **Voices** | 1 (female, read-aloud style) |
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+ | **Output** | 24 kHz mono audio |
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+ | **Parameters** | 11.4M acoustic model + 13.5M vocoder |
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+ | **Download** | 44 MB (ONNX; int8 decoder, fp16 encoder and vocoder) |
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+ | **Runtime** | ONNX Runtime on CPU (Linux, macOS, Windows; x86-64 and ARM64) |
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+ | **License** | Apache-2.0 (vocoder weights MIT) |
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+ | **Version** | v0.1, November 2026 |
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+
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+ ## Samples
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+
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+ All samples were made with the files in this repository at default settings (8 steps, seed 0), with no editing.
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+
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+ | Use | Text | Audio |
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+ |---|---|---|
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+ | Greeting | *Hello! I'm Junco, a tiny voice that runs entirely on your own device.* | <audio controls src="https://huggingface.co/flockspeech/junco/resolve/main/samples/greeting.wav"></audio> |
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+ | Assistant | *Your next meeting starts in fifteen minutes. Would you like me to read the agenda?* | <audio controls src="https://huggingface.co/flockspeech/junco/resolve/main/samples/assistant.wav"></audio> |
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+ | Narration | *The old lighthouse keeper climbed the spiral stairs one last time, and watched the ships come home through the fog.* | <audio controls src="https://huggingface.co/flockspeech/junco/resolve/main/samples/story.wav"></audio> |
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+ | News | *Researchers announced on Tuesday that the new battery can be charged in under ten minutes, and lasts twice as long.* | <audio controls src="https://huggingface.co/flockspeech/junco/resolve/main/samples/news.wav"></audio> |
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+
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+ ## Quick start
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+
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+ The [`flockspeech`](https://pypi.org/project/flockspeech/) Python package bundles these weights, so nothing is downloaded
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+ at run time.
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+
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+ ```sh
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+ pip install flockspeech
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+ flockspeech "Hello! I'm Junco." -o hello.wav --play
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+ ```
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+
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+ ```python
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+ from flockspeech import Junco
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+
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+ tts = Junco() # loads in under a second
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+ audio = tts("Hello there.") # float32 numpy array, 24 kHz mono
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+ tts.save("Hello there.", "hello.wav")
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+
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+ # Low latency: audio is produced sentence by sentence
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+ for chunk in tts.stream(long_text):
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+ play(chunk)
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+ ```
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+
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+ To use the files in this repository directly:
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+
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+ ```python
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+ from huggingface_hub import snapshot_download
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+ from flockspeech import Junco
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+
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+ path = snapshot_download("flockspeech/junco", allow_patterns=["onnx/*"])
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+ tts = Junco(model_dir=f"{path}/onnx")
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+ ```
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+
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+ ### Options
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+
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+ | Parameter | Default | Effect |
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+ |---|---|---|
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+ | `speed` | 1.0 | Speaking rate; 1.2 is 20% faster |
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+ | `steps` | 8 | Generation steps; 4 is about 1.5× faster with slightly lower quality |
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+ | `seed` | 0 | Fixes the small random variation in delivery, so output is reproducible |
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+ | `threads` | up to 4 | CPU threads for ONNX Runtime |
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+
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+ ## Intended use
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+
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+ **Suitable for:**
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+ - Voice output on devices and in apps that must work offline or keep text private: assistants, accessibility and
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+ screen-reading tools, kiosks, robotics, games and embedded products.
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+ - CPU-only servers where cost or latency matters.
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+ - Prototyping and research on small TTS models.
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+
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+ **Out of scope:**
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+ - Languages other than English, or speaker voices other than the one provided. Junco has no voice cloning.
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+ - Expressive, emotional or conversational styles. The voice reads in a neutral, read-aloud style.
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+ - Impersonating a real person, or producing audio meant to deceive listeners about who is speaking or whether the
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+ speech is synthetic.
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+
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+ ## Limitations
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+
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+ - **No text normalisation.** Write numbers, currency, dates and abbreviations in words: "five dollars", not "$5";
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+ "Doctor", not "Dr.". Raw digits and symbols are read by espeak-ng's rules, which may not be what you want.
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+ - **Pronunciation comes from espeak-ng.** Rare names, brands and some homographs, such as *read* and *lead*, can be
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+ mispronounced.
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+ - **One voice, one accent.** The model learned from a single US English speaker.
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+ - **Long-form audio.** Text is synthesised sentence by sentence. Prosody does not carry across sentences.
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+ - **Bright high frequencies.** About 14% of Junco's energy lies above 4 kHz, against 2% for real recordings. On some
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+ playback systems this may sound slightly bright or hissy.
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+
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+ ## Risks and responsible use
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+
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+ Synthetic speech can be misused for deception. Junco produces a single fixed voice and cannot clone speakers, which
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+ limits impersonation risk. We still ask that you:
145
+ - tell listeners when speech is synthetic, where that matters;
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+ - not use the model for fraud, harassment or deceptive impersonation;
147
+ - review output before you use it in safety-critical or high-stakes settings.
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+
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+ ## Model details
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+
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+ ### How it works
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+
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+ Text is converted to phonemes with espeak-ng, a compact neural acoustic model turns the phonemes into a mel
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+ spectrogram, and the [Vocos](https://huggingface.co/charactr/vocos-mel-24khz) vocoder (MIT) turns that into 24 kHz
155
+ audio. All three run in ONNX Runtime on the CPU.
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+
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+ ### Files
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+
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+ | File | Contents | Size |
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+ |---|---|---:|
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+ | `onnx/encoder.onnx` | Acoustic model, part 1 (fp16 weights) | 7.2 MB |
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+ | `onnx/decoder-int8.onnx` | Acoustic model, part 2 (int8) | 9.9 MB |
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+ | `onnx/vocoder.onnx` | Vocos vocoder (fp16 weights) | 27.1 MB |
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+ | `onnx/junco.json` | Mel normalisation statistics and default inference settings | <1 kB |
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+ | `samples/` | The audio samples above | |
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+
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+ ### Training
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+
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+ | | |
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+ |---|---|
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+ | **Data** | [LJ Speech](https://keithito.com/LJ-Speech-Dataset/): 13,100 clips, about 24 hours, one speaker, public domain |
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+ | **Compute** | 3 hours on one NVIDIA T4 GPU, from scratch |
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+
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+ **Environmental impact.** The final training run used about 3 GPU-hours on one NVIDIA T4 (70 W TDP), or about
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+ 0.2 kWh. Architecture experiments before it used more.
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+
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+ ## FAQ
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+
179
+ **Does Junco need a GPU or an internet connection?**
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+ No. It runs on an ordinary CPU with ONNX Runtime. Once installed, speech is generated fully offline and your text
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+ never leaves the machine.
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+
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+ **How big is it?**
184
+ 44.2 MB in total: a 17.1 MB acoustic model plus the 27.1 MB Vocos vocoder. Junco and Goldfinch share the vocoder, so
185
+ both voices together take 61.3 MB.
186
+
187
+ **Can it run on a Raspberry Pi or other ARM boards?**
188
+ It runs on 64-bit ARM Linux wherever `onnxruntime` and `espeakng-loader` publish wheels, including 64-bit Raspberry
189
+ Pi OS.
190
+
191
+ **Can I stream audio for low latency?**
192
+ Yes. `tts.stream(text)` yields audio sentence by sentence, so playback can start before the whole text is done.
193
+
194
+ **Can I use it without Python?**
195
+ The ONNX files run in any ONNX Runtime binding. The text front end (espeak-ng phonemes) and the small loop around the
196
+ three models live in the [`flockspeech`](https://github.com/flockspeech/flockspeech) package, which you can port.
197
+
198
+ **Does it support voice cloning or other languages?**
199
+ No. Junco is one English (US) voice. For a casual, conversational voice, use
200
+ [Goldfinch](https://huggingface.co/flockspeech/goldfinch).
201
+
202
+ **Can I use it commercially?**
203
+ Yes. The weights are Apache-2.0 and the vocoder is MIT. The phonemiser (espeak-ng, phonemizer) is GPL-3.0 and is
204
+ installed separately; see the License section below.
205
+
206
+ ## License
207
+
208
+ - **Junco weights and configuration:** [Apache License 2.0](LICENSE). Commercial use, modification and redistribution
209
+ are allowed.
210
+ - **Vocos vocoder weights** (`onnx/vocoder.onnx`): MIT, © 2023 Charactr Inc. See `onnx/LICENSE-vocos`.
211
+ - **Training data:** LJ Speech, public domain.
212
+
213
+ **Run-time dependency.** Text-to-phoneme conversion uses espeak-ng and phonemizer. Both are GPL-3.0 and are **not**
214
+ included in this repository. The `flockspeech` package installs them as separate dependencies. If you plan to ship
215
+ Junco inside a closed-source product, review their licence terms, or replace the phonemiser with one under a licence
216
+ that suits you. See [NOTICE](NOTICE).
217
+
218
+ ## Citation
219
+
220
+ ```bibtex
221
+ @misc{flockspeech2026junco,
222
+ title = {Junco: a small text-to-speech model for on-device use},
223
+ author = {{Flock Speech}},
224
+ year = {2026},
225
+ howpublished = {\url{https://huggingface.co/flockspeech/junco}},
226
+ note = {Version 0.1}
227
+ }
228
+ ```
229
+
230
+ ## Links
231
+
232
+ - Python package: [pypi.org/project/flockspeech](https://pypi.org/project/flockspeech/)
233
+ - Source code: [github.com/flockspeech/flockspeech](https://github.com/flockspeech/flockspeech)
234
+ - Conversational voice: [flockspeech/goldfinch](https://huggingface.co/flockspeech/goldfinch)
235
+
236
+ ## Acknowledgements
237
+
238
+ We thank the authors of LJ Speech and of the Vocos vocoder.
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+ "language": "en-US",
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+ "sample_rate": 24000,
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+ MIT License
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+
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+ Copyright (c) 2023 Charactr Inc.
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+
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+ Permission is hereby granted, free of charge, to any person obtaining a copy
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+ of this software and associated documentation files (the "Software"), to deal
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+ in the Software without restriction, including without limitation the rights
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+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+ copies of the Software, and to permit persons to whom the Software is
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+ furnished to do so, subject to the following conditions:
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+
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+ The above copyright notice and this permission notice shall be included in all
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+ copies or substantial portions of the Software.
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+
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+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21
+ SOFTWARE.
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