A 2D patch-quantized VQ-VAE with a single 4096-entry codebook plus a HiFi-GAN vocoder reaches ~7.5 kbits/s for 16 kHz speech, with intelligibility below EnCodec and DAC but a simpler, non-residual architecture.
HiFi-GAN: Generative adversarial networks for efficient and high-fidelity speech synthesis,
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Spectrogram Patch Codec: A 2D Block-Quantized VQ-VAE and HiFi-GAN for Neural Speech Coding
A 2D patch-quantized VQ-VAE with a single 4096-entry codebook plus a HiFi-GAN vocoder reaches ~7.5 kbits/s for 16 kHz speech, with intelligibility below EnCodec and DAC but a simpler, non-residual architecture.