Apple Sound Analysis Lacks Cat Hiss Label, Misclassifies It as Snake

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Apple's built-in Sound Analysis framework includes labels for cat meows and purrs but has no class for cat hisses, creating a gap for iOS developers building pet-audio features. When a microphone picks up a real cat hiss, the classifier typically returns silence, a weak generic result, or incorrectly labels it as snake_hiss. Developers can verify this limitation at runtime by querying knownClassifications on SNClassifySoundRequest using the .version1 identifier. The public label set also omits related sounds such as cat_growl and cat_spit, meaning the gap extends beyond just hissing. Engineers who need hiss detection must consider training a custom Core ML model rather than relying on Apple's stock classifier.

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