摘要:
According to embodiments, a method and system for artifact detection in signals is disclosed. The artifacts may take the form of movement artifacts in physiological (e.g., pulse oximetry) signals. Artifacts in the wavelet space of the physiological signal may be removed, replaced, ignored, filtered, or otherwise modified by determining the energy within a predefined moving area of the wavelet scalogram, comparing the determined energy within the predefined moving area of the wavelet scalogram to a threshold value, and masking at least one area of artifact in the wavelet scalogram based, at least in part, on the comparison. From the enhanced signal, physiological parameters, for example, respiration, respiratory effort, pulse, and oxygen saturation, may be more reliably and accurately derived or computed.
摘要:
According to embodiments, methods and systems for determining effort is disclosed. Effort may relate to a measure of strength of at least one repetitive feature in a signal. Effort may also relate to physical effort or work of a process (e.g., respiratory effort) that may affect the signal (e.g., a PPG signal). Effort may be determined through feature analysis of a transformed signal that has been transformed via a continuous wavelet transform. For example, respiratory effort may be determined using a scalogram generated based at least in part on a wavelet transform of a physiological signal and analyzing features of the scalogram.
摘要:
The present disclosure relates to systems and methods for detecting features of a signal. According to embodiments, by transposing segments of a signal, such as segments representing pulses in a PPG signal, such that they are stacked next to each other, various characteristics about the signal may be discerned such as information about repetitive features of the signal. According to an embodiment, from a PPG signal respiration information may be determined about individual breaths, blood pressure changes may be determined, and information about other physiological parameters affecting the PPG signal may be determined.
摘要:
Embodiments may include systems and methods capable of processing an original signal by selecting and mirroring portions of the signal to create a new signal for further analysis. In an embodiment, the signal may be a photoplethysmograph (PPG) signal and the new signal may be further analyzed using continuous wavelet transforms. Any suitable number of reconstructed new signals may be created from the original signal and scalograms may be derived at least in part from the new signals. Ridges may be extracted from the scalograms of the new signals and secondary scalograms may be further derived from the ridges. A sum along amplitudes technique may be applied to a selected scalogram and may be plotted as a function of the scale of the scalogram. Desired information, such as respiration information within the original signal, may be identified from the plot.
摘要:
A monitoring system includes a portable alarm having a base unit with an electronic package. At least one sensor is associated with the electronics to transmit signals to the electronics in the event of a breach. The electronic package in turn signals a central monitoring station, as well as transmits a signal to an audible or visual alarm coupled with the base unit. Also, the base unit includes a device to selectively program the electronics to enable the user to utilize particular programs. A bracket, which retains and secures the base unit, may be secured to a surface to enable desirable positioning of the base unit within a structure.
摘要:
An asset monitoring and security system includes at least one asset assigned a unique identifier and operable wirelessly transmit an identification signal embodying the identifier. A data store maintains a list of the assets and privileges associated with the assets for authorized users of the assets. A control unit is adapted to receive identification signals from the assets and monitor positions of the assets within a defined area. The control unit communicates with the data store and is further operable to initiate an alarm event when privileges associated with a given asset for authorized users of the asset are exceeded. Each of the assets includes a lock-out mechanism that impedes use of the asset when the lock-out mechanism is activated. The control unit activates the lock-out mechanism of a given asset when the privileges associated with the asset for authorized users of the asset are exceeded.
摘要:
A system of cordless outdoor power tools includes a plurality of hand-held cordless outdoor power tools, with each outdoor power tool including a housing and a motor assembly with a motor. The system may include and at least one battery pack removably attachable to one or more of the outdoor power tools. The at least one battery pack, when attached to a given tool, provides a nominal output voltage of approximately 28 volts or greater to the motor of the tool. One or more of the outdoor power tools with attached battery pack has a power output to weight ratio of 70 watts per pound (W/lb) or greater.
摘要:
An illumination system including a light source, a light guide including an output surface, a first interference reflector positioned between the light source and the output surface of the light guide, and emissive material positioned between the first interference reflector and the output surface of the light guide is disclosed. The light source emits light having a first optical characteristic. The first interference reflector substantially transmits light having the first optical characteristic and substantially reflects light having a second optical characteristic. The emissive material emits light having the second optical characteristic when illuminated with light having the first optical characteristic.
摘要:
A hammer drill/driver with a motor having an output member, a planetary transmission, a clutch assembly and a clutch bypass. The planetary transmission, which includes a ring gear, receives rotary power from the output member and produces a rotary output. The clutch assembly has a clutch profile, which is coupled to the ring gear, and a first pin assembly having a first follower, a first pin member and a first spring that biases the first follower into contact with the clutch profile. The clutch bypass has a bypass profile, which is coupled to the ring gear, and second pin assembly having a second follower, a second pin member, a third spring, which biases the second follower away from the bypass profile, and a fourth spring, which biases the second follower away from the second pin member. A method for operation of a hammer drill/driver is also provided.
摘要:
An illumination system including a light source, a light guide including an output surface, emissive material positioned to receive light from the output surface of the light guide, and a first interference reflector positioned between the output surface of the light guide and the emissive material is disclosed. The light source emits light having a first optical characteristic. The emissive material emits light having a second optical characteristic when illuminated with light having the first optical characteristic. The first interference reflector substantially transmits light having the first optical characteristic and substantially reflects light having the second optical characteristic.