Apple Inc.

Daniel J Culbert

Ehsan Maani

Stephen J Waydo

Ian R Shapiro

Robert V Welland

Robert T Aloe

Sankalita Saha

Aleksandar Pance

Craig C Leong

Sorin V Dusan

Ke-Chiang C Chu

Paul Puskarich

Nathan Alan Johanningsmeier

Todd K Whitehurst

Ronald Nadim Isaac

Niel David Warren

Ruchi Goel

Jim Lynn Tenneboe

A device for determining a heart rate of a user has a PPG sensor and an accelerometer to compensate for acceleration artifacts within the PPG signal. The device transforms time domain PPG and accelerometer signals into the frequency domain using a Fourier transformation and utilizes the Fourier coefficient magnitudes as indicative of the probability of candidate heart rate values. Candidate heart rate values are determined at sampling times over a time interval and a most probable heart rate path during the time interval is determined using a reward/penalty algorithm.

Heart rate path optimizer

A wearable device that attaches to a body part of a user via an attachment member operates in at least a connected and a disconnected state. One or more sensors located in the wearable device and/or the attachment member detect the user's body part when present. Such detection may only be performed when the attachment member is in a connected configuration and may be used to switch the wearable device between the connected and disconnected states. In this way, the wearable device operates in the connected state when worn by a user and in the disconnected state when not worn by the user.

Wearing dependent operation of wearable device

Algorithms for detecting whether a device is properly secured to a user's skin are described. The operation of a device, such as a wearable device, can be adjusted based on whether the device is properly secured to a user's skin (e.g., on-wrist) or not properly secured to the user's skin (e.g., off-wrist). For example, certain functions can be disabled for power-saving, security or other purposes if the device is off-wrist. In order to avoid falsely identifying the device as off-wrist or on-wrist, algorithms for detecting whether the device is on-wrist or off-wrist can calculate one or more variances based on signals measured by a light sensor and compare the one or more variances with one or more thresholds. Comparing the one or more variances to the one or more threshold can improve the accuracy of wrist-detection algorithms.

Wrist-detection algorithm

A light emitter and light sensor pair can be used to determine one or more characteristics of a user's vasculature. For example, a pulse oximeter employs a light emitter and a light sensor to measure the percentage of oxygenated blood in a subject. In examples of the present disclosure, light emitters and light sensors can be used to perform biometric identification of a user based on identifying characteristics of the user's vasculature. For example, light information can be obtained at one or more light sensors, and the information can be compared to stored information associated with a user identity. Based on the comparison, the user of the device can be identified as having the user identity.

User identification system based on plethysmography

The present embodiments provide a system that dynamically controls power consumption in a computing device. During operation, the system measures the performance of the computing device while executing a work-loop. Next, the system determines a derived completion time for the work-loop based on the measured performance. (For example, the derived completion time can be an expected completion time, a maximum completion time, or more generally a completion time distribution.) The system then determines a deadline-proximity for the work-loop based on a comparison between the derived completion time and a deadline for the work-loop. (For example, the deadline-proximity can be an expected deadline-proximity, a minimum deadline-proximity, or more generally a deadline-proximity distribution.) Finally, the system controls the power consumption of the computing device based on the determined deadline-proximity for the work-loop.

Dynamically controlling power based on work-loop performance

An electronic device having an enclosure including an upper panel and a bottom panel operably connected to the upper panel. A transducer is operably connected to the enclosure and the transducer is configured to mechanically vibrate the enclosure. The transducer includes an electromagnet, a magnet in communication with the electromagnet and a bracket substantially surrounding the electromagnet and the magnet, the bracket substantially secures the transducer to the bottom panel.

Electronic devices with improved audio

A structure and method for routing information desired by a particular entity within a pen-based computer system to that entity are provided. The desired information is contained in &ldquo;packages&rdquo; containing the desired information in one or more &ldquo;parts&rdquo; and also containing a package directory (located in front of the parts) that identifies the package and provides selected information about the package and its parts. The packages are received and processed by a package manager that maintains a registry of entities that desire specified types of information (parts) that might be found in an incoming package. When the package manager receives a package containing such information, it routes the part containing that information to a &ldquo;part handler&rdquo; associated with the entity requesting the information. The package manager then updates a package registry to reflect that the package has been successfully delivered.

Structure and protocol for routing information in a system

A system for extending the data capacity of a primary storage device in a computer which utilizes transparent data compression. The system utilizes a compressed memory even within the primary storage device along with a compression/decompression algorithm to extend the memory space. The system also includes a water line or limit within the primary storage device to ensure that memory space is always available.

Method and apparatus for transparently compressing data in a primary

An efficient speed trie search process which generates a sequence of pointers for each family of children in a trie, the sequences of pointers being organized in a predefined order according to a detected data type information of the input data stream. In response to the detected data type information, the trie search process selects a pointer sequence organization from one or more predefined organization sequences, such as an organization sequence from the most recently matched data in a family of nodes to the least recently matched data in that family of nodes, an organization in accordance to a predetermined frequency distribution of a predefined set of data symbol, or an adaptive frequency distribution sequence of a set of symbols detected in an input data stream. Such arrangement of pointers, in response to the detected input data type, reduces significantly the process time to search through a trie for matching data strings. In an another alternative embodiment, a lookup table is provided for the first level search, comprising searching the family consisting the children of the root of the trie.

Growing community of inventors

Los Gatos, CA, United States of America

Daniel J Culbert