首页>
外国专利>
Comparing differential ZC count to database to detect expected sound
Comparing differential ZC count to database to detect expected sound
展开▼
机译:将差异ZC计数与数据库进行比较以检测预期的声音
展开▼
页面导航
摘要
著录项
相似文献
摘要
A low power sound recognition sensor is configured to receive an analog signal that may contain a signature sound. Sparse sound parameter information is extracted from the analog signal and compared to a sound parameter reference stored locally with the sound recognition sensor to detect when the signature sound is received in the analog signal. A portion of the sparse sound parameter information is differential zero crossing (ZC) counts. Differential ZC rate may be determined by measuring a number of times the analog signal crosses a threshold value during each of a sequence of time frames to form a sequence of ZC counts and taking a difference between selected pairs of ZC counts to form a sequence of differential ZC counts.
展开▼