Estimated keyword length refinement based on speech rate classification

An apparatus for processing one or more audio samples, comprising:

• one or more memories configured to store the one or more audio samples;
• and
• one or more processors coupled to the one or more memories, the one or more processors being configured to:
• detect, using a first keyword detection model, a spoken keyword within an audio sample of the one or more audio samples;
• determine estimated keyword indices corresponding to detection of the spoken keyword within the audio sample, the estimated keyword indices comprising an estimated keyword start index and an estimated keyword end index;
• determine, using a speech rate classification machine learning network, speech rate information corresponding to the audio sample;
• obtain an average spoken length value corresponding to the spoken keyword and the speech rate information;
• and
• generate refined keyword indices based on the estimated keyword indices and the average spoken length value, wherein the refined keyword indices include a refined keyword start index shifted to a time earlier than the estimated keyword start index.