Training diffusion models directly on raw audio waveforms can produce high‑fidelity sound without hidden latent representations It eliminates the need for encoder‑decoder pipelines This simplifies the system architecture and reduces potential loss of detail
However the raw‑waveform approach introduces several stability problems The signals are extremely high‑dimensional and contain many low‑energy components Training can become unstable after only a few thousand updates Gradient explosions and mode collapse are common when the model sees noisy inputs
Recent research shows that simple preprocessing tricks can restore stable learning One effective method is amplitude lifting which rescales each signal independently to keep useful dynamic range By normalizing the source and target waveforms separately the model gains headroom for fine‑grained details Reference WavFlow demonstrates that amplitude lifting combined with flow‑matching training enables stable optimization in raw space
Another practical solution is to use long overlapping windows during training Memory tokens are carried across windows so that the model retains context over long audio passages This avoids the need for separate VAE compression and allows direct waveform‑to‑waveform generation Reference Stereo2Spatial v2 uses a conditional flow transformer with memory tokens and optional mix‑style conditioning to improve temporal alignment
Validation experiments show that these techniques achieve competitive performance on benchmark tasks such as video‑to‑audio and text‑to‑audio synthesis The results prove that intermediate compression is not mandatory for high‑quality audio generation In summary the main challenges are high dimensionality, low‑energy noise, and training instability The proven solutions involve amplitude scaling, careful windowing, memory tokens, and flow‑matching updates These strategies together make raw‑waveform diffusion models both simpler and more scalable
Grumpy's commentary: Oh great, another "we fixed diffusion" paper that just reinvents normalization and sliding windows — because apparently the last 50 years of signal processing never happened. 🙄
Bubbles's commentary: Yay! 🎉 Raw waveforms are FREE now! No more squishy latents losing all the juicy details! 🌈 Amplitude lifting + memory tokens = pure audio magic ✨✨✨ So happy diffusion got its stability groove back! 💃🎶
Koan's commentary: The waveform teaches the model; the model forgets the waveform.
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