摘要:
This method for detecting the activity (A) of a physical system having a motion sensor comprises the following steps: extracting (100) a sequence (M) of measurements provided by the motion sensor; deducing (102) therefrom an observation sequence (O) calculated using the sequence of measurements (M); determining (104) the activity (A) of the physical system in the form of a sequence of states corresponding to the observation sequence, using a statistical model of components of the observation sequence in view of a plurality of possible predetermined states in which the physical system may be located. At least one component of the observation sequence (O) is calculated from a reference value ( À ) of a vector representative of a reference axis. Moreover, the method comprises the following calibration steps: calculating (106) a likelihood value of the observation sequence (O) in view of said statistical model; comparing (106) this likelihood value to a predetermined threshold; depending on this comparison, triggering an estimation (108) of a new reference value ( À ) of the vector representative of the reference axis.
摘要:
Dispositif d'évaluation de la SpO2 d'un être vivant, comportant un oxymètre (2) destiné à être fixé sur ledit être vivant, ledit oxymètre étant configuré pour produire au moins deux signaux photopléthysmographiques, dit signaux PPG, l'un dans le rouge et l'autre dans l'infrarouge et une unité de traitement (4) desdits signaux PPG, ladite unité de traitement (4) comportant des moyens pour vérifier la périodicité de chacun des signaux PPG, des moyens de détermination d'un indicateur de qualité des signaux PPG, des moyens d'estimation du ratio des ratios, et des moyens de calcul de la SpO2 à partir de la valeur estimée du ratio des ratios, lesdits moyens d'estimation tenant compte de la valeur de l'indicateur de qualité dans l'estimation du ratio des ratios.
摘要:
The invention relates to a system for observing a person's walking activity, including a device (DISP) which, for one footstep, can output: a first difference between the angular speeds of the tibia, corresponding to the difference between the moment at which the heel of the foot is placed and the moment at which the foot is laid flat; a second difference between the angular speeds of the tibia, corresponding to the difference between the moment at which the heel is placed and the moment at which the last toe of the foot is lifted; and an angular speed of the tibia, corresponding to the moment at which the foot is laid flat. The system includes a means (AN) for analyzing the signals generated by the device and capable of determining a gait type for the user as a function of time, using a hidden Markov model having N states that respectively correspond to N gait types.
摘要:
The invention relates to a method for the blind estimation of at least one parameter of an OFDM signal by maximising an objective function depending on said parameter. The objective function implements a calibrated model of the OFDM modulation and an adapted filtering corresponding to said model. The OFDM signal, which is base-band demodulated and sampled in an observation window, is subjected to the adapted filtering for calculating the objective function. It is also proposed to include in the calibrated model the time offset between the observation window and an OFDM symbol as well as the frequency offset between the carrier frequency of the OFDM signal and the base-band demodulation frequency.
摘要:
Dispositif d'évaluation de la SpO2 d'un être vivant, comportant un oxymètre (2) destiné à être fixé sur ledit être vivant, ledit oxymètre étant configuré pour produire au moins deux signaux photopléthysmographiques, dit signaux PPG, l'un dans le rouge et l'autre dans l'infrarouge et une unité de traitement (4) desdits signaux PPG, ladite unité de traitement (4) comportant des moyens pour vérifier la périodicité de chacun des signaux PPG, des moyens de détermination d'un indicateur de qualité des signaux PPG, des moyens d'estimation du ratio des ratios, et des moyens de calcul de la SpO2 à partir de la valeur estimée du ratio des ratios, lesdits moyens d'estimation tenant compte de la valeur de l'indicateur de qualité dans l'estimation du ratio des ratios.