iSceneDetect ON Semiconductor's high end preconfigured product portfolio
●iSceneDetect is a new feature unique to ON Semiconductor’s high end preconfigured product portfolio. This feature allows hearing-aid operation using a single program memory that functions in any listening situation. When enabled. iSceneDetect continually analyzes the acoustic environment and automatically adjusts the selected algorithms without the need for user intervention.
●The iSceneDetect feature simplifies user controls while improving audibility, comfort and listening experience according to specific user preferences.
●This information note explains the principles of operation of iSceneDetect and describes how individual algorithmic features are controlled.
■PRINCIPLES OF OPERATION
●iSceneDetect uses sophisticated algorithms to analyze the microphone signals and classify the listening emironment. Four types of acoustic characteristics are used in the classification process:
◆Absolute sound levels
◆Signal envelope
◆Spectral content
◆Directional microphone information
●These characteristics are analysed and used together to determine the appropriate classification for a given acoustic en\-ironment. Six separate environments are supported by iSceneDetect: quiet, speech in quiet, noise, speech in noise, music and wind. Knowledge of the detected environment is used by iSceneDetect to adjust the settings of the other features for optimum audio performance. iSceneDetect currently controls the FBC. NR. \VDRC and the ADM features. The specific control provided for each feature is described in more detail below.
●iSceneDetect performs careful analysis of the acoustic signals prior to making a classification. This analysis requires a certain amount of elapsed time to ensure a robust classification. The recognition time required for each environment is different and is not user adjustable. In addition, significant variability in recognition time may be observed under different conditions. Table 1 pro\ides approximate guidelines for recognition times under nominal conditions. Actual recognition times will vary.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2021/8/6 |
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Rev. 3 |
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AND9025/D |
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346 KB |
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