Abstract: In one embodiment, a device obtains one or more packets of a traffic session in a network. The device determines, for a particular packet of the one or more packets that match a filter, a fingerprint for the particular packet. The device identifies a plurality of traffic sessions whose packets match the fingerprint, wherein each of the plurality of traffic sessions is associated with at least one process. The device updates a process with the traffic session by applying a classifier to the plurality of traffic sessions.

Abstract: In one embodiment, a device obtains telemetry data regarding an encrypted traffic session in a network. The telemetry data includes Transport Layer Security (TLS) features of the traffic session and auxiliary information indicative of a destination address of the traffic session, a destination port of the traffic session, or a server name associated with the traffic session. The device retrieves, using the obtained telemetry data, a plurality of candidate processes from a TLS fingerprint database that relates processes with telemetry data from encrypted traffic sessions initiated by those processes. The device uses a probabilistic model to assign probabilities to each of the plurality of candidate processes. The device identifies one of the plurality of candidate processes as having initiated the encrypted traffic session based on its assigned probability.

Abstract: In one embodiment, a device obtains telemetry data regarding an encrypted traffic session in a network. The telemetry data includes Transport Layer Security (TLS) features of the traffic session and auxiliary information indicative of a destination address of the traffic session, a destination port of the traffic session, or a server name associated with the traffic session. The device retrieves, using the obtained telemetry data, a plurality of candidate processes from a TLS fingerprint database that relates processes with telemetry data from encrypted traffic sessions initiated by those processes. The device uses a probabilistic model to assign probabilities to each of the plurality of candidate processes. The device identifies one of the plurality of candidate processes as having initiated the encrypted traffic session based on its assigned probability.

Abstract: An implantable medical device comprises at least two sensing channels for receiving sensed first and second location electrical signals originating from two different locations of a heart. A control unit is connected to the sensing channels and is adapted to process sensed electrical signals originating from first and second locations of the heart. The control unit incorporates an adaptive filter compensator adapted to generate an estimate signal for compensating a far-field contribution of the second location signal to the first location signal, thereby generating an output signal representing a near field signal originating from the first location. A gate is connected to the second location sensing channel and is adapted to enable the adaptive filter compensator only if a predetermined signal is sensed via the second location sensing channel.

Abstract: The invention relates to heart stimulators and implantable atrial pacemakers which utilize a rhythm based atrial capture threshold test wherein in a ventricle based DDI mode a predetermined number of ventricle started atrial and ventricular escape intervals are triggered with an overdrive rate about 20% higher than an intrinsic heart rate. The number of atrial sense events during atrial capture threshold test is counted. Too high of a number of atrial sense events indicates loss of capture due to too small of a pulse strength of the atrial stimulation pulses.

Abstract: An apparatus according to the invention for the classification of physiological events has a signal input for the input of a physiological signal representing or constituting a physiological event and a classification unit 1 for classifying the physiological signal on the basis of its signal shape.

Abstract: The invention relates to heart stimulators and implantable atrial pacemakers which utilize a rhythm based atrial capture threshold test wherein in a ventricle based DDI mode a predetermined number of ventricle started atrial and ventricular escape intervals are triggered with an overdrive rate about 20% higher than an intrinsic heart rate. The number of atrial sense events during atrial capture threshold test is counted. Too high of a number of atrial sense events indicates loss of capture due to too small of a pulse strength of the atrial stimulation pulses.

Abstract: An implantable medical device comprises at least two sensing channels for receiving sensed first and second location electrical signals originating from two different locations of a heart. A control unit is connected to the sensing channels and is adapted to process sensed electrical signals originating from first and second locations of the heart. The control unit incorporates an adaptive filter compensator adapted to generate an estimate signal for compensating a far-field contribution of the second location signal to the first location signal, thereby generating an output signal representing a near field signal originating from the first location. A gate is connected to the second location sensing channel and is adapted to enable the adaptive filter compensator only if a predetermined signal is sensed via the second location sensing channel.

Abstract: An apparatus according to the invention for the classification of physiological events has a signal input for the input of a physiological signal representing or constituting a physiological event and a classification unit 1 for classifying the physiological signal on the basis of its signal shape.

Abstract: An apparatus according to the invention for the classification of physiological events on the basis of physiological signals which represent or constitute the physiological events by means of a probabilistic neural network 5 includes a probabilistic neural network 5 which is adapted to receive a set of values representing the physiological signal and which contains a number of event classes which represent physiological events and which are respectively determined by a number of comparative values, which network is adapted on the basis of the comparison of the set of values with the comparative values to implement an association of the physiological signal represented by the set of values with one of the event classes, and an updating unit 10 connected to the probabilistic neural network 5 for updating the comparative values of an event class on the basis of the set of values of at least one physiological signal which has been associated with said event class in a preceding association operation.

Abstract: An apparatus for processing physiological signals, which includes a signal pick-up unit for picking up physiological measurement signals, in particular for picking up electrical signals of a heart, and first detection means which are connected to the signal pick-up unit and include signal processing means such as a filter and a first threshold value store and a comparison unit which is connected thereto and which is adapted to output a first marker signal if the amplitude of the measurement signal exceeds a threshold value stored in the first threshold value store, second detection means which are connected to the signal pick-up unit and include a second threshold value store and a second comparison unit which is connected thereto and which is adapted to output a second marker signal if the amplitude of the measurement signal exceeds a threshold value stored in the second threshold value store, and an evaluation unit which is connected to the first and second detection means for taking over a respective serie

Abstract: Apparatus for processing body signals, comprising at least one sensor (10, 12) for picking up in particular electrical signals from a living body, and means (16, 18) for preparing picked-up signals for further processing, and at least one first memory (22) for a picked-up measurement signal or signal portions, comprising at least one second memory (26) which contains a predeterminable comparison signal which is finite in respect of time, and signal comparison means (24) which are connected to the second memory (26) and the first memory (22) and which are adapted for sliding comparison of signal portions, which overlap in respect of time, of the measurement signal in the first memory (22) to the comparison signal stored in the second memory (26) and for output of a correlation coefficient representing the similarity of each compared signal portion of the measurement signal to the comparison signal.

Abstract: An apparatus for processing physiological signals, which includes a signal pick-up unit for picking up physiological measurement signals, in particular for picking up electrical signals of a heart, and first detection means which are connected to the signal pick-up unit and include signal processing means such as a filter and a first threshold value store and a comparison unit which is connected thereto and which is adapted to output a first marker signal if the amplitude of the measurement signal exceeds a threshold value stored in the first threshold value store, second detection means which are connected to the signal pick-up unit and include a second threshold value store and a second comparison unit which is connected thereto and which is adapted to output a second marker signal if the amplitude of the measurement signal exceeds a threshold value stored in the second threshold value store, and an evaluation unit which is connected to the first and second detection means for taking over a respective serie

Abstract: Apparatus for processing body signals, comprising at least one sensor (10, 12) for picking up in particular electrical signals from a living body, and means (16, 18) for preparing picked-up signals for further processing, and at least one first memory (22) for a picked-up measurement signal or signal portions, comprising at least one second memory (26) which contains a predeterminable comparison signal which is finite in respect of time, and signal comparison means (24) which are connected to the second memory (26) and the first memory (22) and which are adapted for sliding comparison of signal portions, which overlap in respect of time, of the measurement signal in the first memory (22) to the comparison signal stored in the second memory (26) and for output of a correlation coefficient representing the similarity of each compared signal portion of the measurement signal to the comparison signal.

Abstract: Apparatus for compensating component audio signals comprises amplifier means and a gain control circuit for selectively adjusting the gain of the amplifier means in response to data values received by the gain control circuit. The apparatus has power supply terminals for supplying operating current from an external power source to the amplifier and the gain control circuit. In addition, the apparatus comprises an electronic storage device for storing data values and applying those data values to the gain control circuit. The stored data values are maintained in the apparatus upon interruption of the supply of operating current to the power supply terminals. The apparatus has an input port for applying data values to the storage device, and does not have manually actuable controls for selectively adjusting the stored data values.

Abstract: Apparatus for equalizing a soundfield comprises an amplifier and a gain control circuit for selectively adjusting the gain of the amplifier as a function of frequency in response to data values received by the gain control circuit. The apparatus has power supply terminals for supplying operating current from an external power source to the amplifier and the gain control circuit. In addition, the apparatus comprises an electronic storage device for storing data values and applying those data values to the gain control circuit. The stored data values are maintained in the apparatus upon interruption of the supply of operating current to the power supply terminals. The apparatus has an input port for applying data values to the storage device, and does not have manually actuable controls for selectively adjusting the stored data values.

Abstract: A biological signal source amplifier having a rapid overload recovery capability and an output reference level translation feature. The amplifier responds to input signals of excessive amplitude by actively decreasing the response time of a reactive input coupling circuit when the input signal crosses predetermined dynamic limits. A differential amplifier is used in such a way as to produce an output referenced to a voltage level other than power supply ground. A level translation feature is provided for translating the output signal to the input of a subsequent circuit having a different reference level without introducing a dc offset or other associated amplitude distortion, or effects of capacitive coupling on low-frequency response.

Abstract: A circuit-energized voltage tester for determining whether or not the voltages on the tip and ring conductors of a telephone line are within their normal ranges is disclosed. The voltage tester is adapted for inclusion in a standard telephone repairman's handset and includes an energy storage circuit that becomes charged upon the application of handset test probes to tip and ring conductors if they are carrying a voltage greater than a predetermined level. Upon the closure of a switch, the energy thus stored energizes the remaining portion of the voltage tester. If suitable voltages are present on the tip and ring conductors, light emitting diodes forming a portion of a pair of optical isolators are controlled such that no measurement indication is provided. Specifically, the photo transistor portions of the optical isolators are alternately interrogated by a low frequency measurement control oscillator.