Keyword Detection Apparatus Preventing False Triggers
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Solution Overview
Problem
Conventional voice-controlled apparatuses falsely detect keywords or phonemes similar to intended keywords, leading to unintended keyword detection.
Innovation Solution
A keyword detection apparatus comprising a keyword detection unit, a voice detection unit, a delay unit, and an in-sentence keyword excluding unit, which generates a delayed voice section detection result to differentiate between intended and unintended keyword utterances, preventing false detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If keyword detection is performed without voice section detection, then keyword detection speed is improved, but false detection rate increases
Solution Approach 1:
The voice detection unit performs preliminary detection of voice sections before the keyword detection unit processes the audio signal. By pre-identifying which time segments contain actual speech, the system can later focus keyword detection only on those segments, preventing false detections from non-voice audio while maintaining efficient processing speed.
Solution Approach 2:
The voice section detection result acts as an intermediary filter between the raw audio input and the keyword detection process. This intermediary component separates relevant voice-containing segments from irrelevant silent or noise segments, allowing the keyword detection unit to operate faster on reduced data without sacrificing accuracy.
2Measurement precision
If voice section detection is added to differentiate intended and unintended keyword utterances, then false detection accuracy is improved, but device complexity increases
Solution Approach 1:
The audio processing system is segmented into distinct functional modules: a voice detection unit that identifies voice sections, and a keyword detection unit that processes only those voice sections for keyword detection. This segmentation allows each unit to specialize in specific tasks, improving overall precision while keeping the architecture modular and manageable despite the increased complexity.
Data Source
Figure 1
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Figure 4A~4B
AI summary
An object is to prevent a keyword from being falsely detected from an utterance that is not intended for keyword detection. A keyword detection unit 11 generates a keyword detection result indicating a result of detecting an utterance of a predetermined keyword from an input voice. A voice detection unit 12 generates a voice section detection result indicating a result of detecting a voice section from the input voice. A delay unit 13 gives a delay that is at least longer than an utterance time of the keyword, to the voice section detection result. An in-sentence keyword excluding unit 14 updates the keyword detection result to a result indicating that the keyword has not been detected when the keyword detection results indicates that the keyword has been detected and the voice section detection result indicates that a voice section has been detected.