苹果传感器的进击

Core Insights - The article discusses the introduction of the heart rate sensor in AirPods Pro 3, highlighting its innovative features and the development process behind it [3][4][5]. Design and Features - AirPods Pro 3 retains the iconic design with redesigned ear tips made of silicone and foam, and a slightly elongated charging case [2]. - The new heart rate sensor allows tracking of 50 different workouts, either independently or in conjunction with the Apple Watch for more accurate readings [2][3]. Development Process - The heart rate sensor is based on a decade of research and development, leveraging knowledge gained from the Apple Watch [4]. - The sensor uses invisible infrared light to measure blood flow in the ear, differing from the green LED used in the Apple Watch [4][5]. Algorithm and Data Processing - The algorithms for heart rate tracking were adapted from the Apple Watch but optimized for the smaller form factor of AirPods [5]. - Extensive testing was conducted on thousands of participants to ensure the sensor works effectively across diverse ear shapes and skin tones [5][7]. Integration with Other Features - The heart rate sensor works in conjunction with accelerometers and gyroscopes to track various workout metrics, including steps, distance, and calories burned [7][8]. - Apple utilized over 50 million hours of workout data to refine the algorithms for AirPods Pro 3 [7]. Accuracy and Validation - Apple employed medical-grade equipment to validate calorie tracking accuracy, ensuring the algorithms are reliable [8]. - The integration of multiple data sources allows for improved accuracy in heart rate readings, comparing signals from both AirPods and Apple Watch [11]. Future Potential - The article suggests that AirPods Pro 3 could be seen as a hybrid device, combining features of high-end headphones and fitness trackers, with ongoing updates expected to enhance functionality [11].