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Neural Audio Codecs: Bridging the Gap Between Language Models and Audio Processing

By

karimf

7mo ago· 31 min readenInsight

Summary

This article explores the technical challenge of integrating audio directly into large language models (LLMs) using neural audio codecs. It explains that current voice interfaces for LLMs typically work by transcribing speech to text, generating text responses, and converting back to speech via text-to-speech systems. The author argues this approach lacks true audio understanding - models cannot detect emotional nuances like frustration, sarcasm, or emphasis in speech. The article proposes using neural audio codecs as an encoder-decoder framework to allow LLMs to process and generate audio continuations directly, enabling more natural and emotionally aware speech interactions.

Key quotes

· 4 pulled
As of October 2025, speech LLMs suck. Many LLMs have voice interfaces, but they usually work by transcribing your speech, generating the answer in text, and using text-to-speech to read the response out loud.
The model can't hear the frustration in your voice and respond with empathy, it can't emphasize important words in its answer, it cannot sense sarcasm.
The plan: sandwich a language model in an audio encoder/decoder pair (=neural audio codec), allowing it to predict audio continuations.
That's perfectly fine in many cases (see Unmute), but it's a wrapper, not real speech understanding.
Snippet from the RSS feed
Why modeling audio is harder than text, and how to make it feasible with neural audio codecs.

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