metadata
license: apache-2.0
tags:
- qhexrt
- melotts
- tts
- hexagon
- npu
- qnn
language:
- en
pipeline_tag: text-to-speech
MeloTTS-EN — QHexRT NPU bundle (Hexagon v79)
Precompiled MeloTTS English text-to-speech for the QHexRT runtime on Qualcomm Hexagon v79
(Snapdragon 8 Elite / SM8750, e.g. Galaxy S25). The 3 acoustic graphs (encoder → flow → decoder) are
Qualcomm AI Hub qnn_context_binary graphs; the g2p frontend + duration alignment + vocoder windowing
are QHexRT's own host pipeline. Device-validated: text → 44.1 kHz mono audio.
Measured on S25/v79: ~1.0 s to synthesize 4.56 s of speech (≈4.5× real-time).
Contents (v79/)
| file | what |
|---|---|
melotts-en.json |
QHexRT manifest (TTS family, tts_synthesize plan) |
melo_encoder.bin |
text/phoneme encoder (→ durations + priors) |
melo_flow.bin |
flow (normalizing-flow latent) |
melo_decoder.bin |
vocoder/decoder (→ waveform) |
melo_tokens.txt |
phoneme token table (g2p) |
melo_lexicon.txt |
open pronunciation lexicon (g2p) |
Run (QHexRT CLI)
huggingface-cli download runanywhere/melotts_en_HNPU --local-dir melotts_en_HNPU
# QNN libs come from the QAIRT SDK (lib/aarch64-android) + the v79 HTP skel; push them next to qhx_say.
adb push melotts_en_HNPU/v79 /data/local/tmp/wq/melotts
adb shell "cd /data/local/tmp/wq && LD_LIBRARY_PATH=. ADSP_LIBRARY_PATH=. \
./qhx_say melotts/melotts-en.json libQnnHtp.so libQnnSystem.so melotts 'Hello from Hexagon.' melotts/out.wav"
# -> melotts/out.wav (44.1 kHz mono)
Notes
- Arch: v79 only (context binaries are dsp-arch-pinned).
- No custom op-package needed — pure-native AI Hub graphs.
- v1: no BERT prosody (ja_bert=0). English only.
- Source: MeloTTS-EN, compiled via Qualcomm AI Hub for
qualcomm-snapdragon-8-elite-for-galaxy.