37results about How to "Accurate signal detection" patented technology

The present invention provides an OOB detection circuit capable of making accurate signal determination even in the case where a characteristic fluctuation occurs in an analog circuit, thereby preventing deterioration in the yield of a product. To an amplitude determining circuit, a characteristic adjustment register for changing setting of an amplitude threshold adjustment mechanism for distinguishing a burst and a squelch from each other provided for the amplitude determining circuit is coupled. The characteristic adjustment register is controlled by a self determination circuit. An output of the amplitude determination circuit is supplied to a time determining circuit and also to the self determination circuit. On the basis of the output of the amplitude determining circuit, the self determination circuit controls the characteristic adjustment register.

Signal detection circuitry for a serial interface oversamples the input—i.e., samples the input multiple times per clock cycle—so that the likelihood of missing a signal is reduced. Sampling may be done with a regenerative latch which has a large bandwidth and can latch a signal at high speed. The amplitude threshold for detection may be programmable, particularly in a programmable device. Thus, between the use of a regenerative latch which is likely to catch any signal that might be present, and the use of oversampling to avoid the problem of sampling at the wrong time, the likelihood of failing to detect a signal is greatly diminished. Logic, such as a state machine, may be used to determine whether the samples captured s do or do not represent a signal. That logic may be programmable, allowing a user to set various parameters for signal detection.

More accurate signal detection circuitry in serial interfaces, particularly on a programmable integrated circuit device, such as a PLD, includes a high-speed, high-resolution, high-bandwidth comparator, along with digital filtering, to reduce the effect of process, temperature or supply variations. The comparator is used to compare a direct input signal with a programmable reference voltage, and, in a preferred embodiment, can detect the signal level within 8 mV accuracy. The output of the comparator may then be digitally filtered. Preferably, both a high-pass digital filter and a low-pass analog filter may be used to eliminate glitches and low-frequency noise. Preferably, the digital filters are programmable to adjust the sensitivity to noise. The filtered output is then latched and output to indicate receipt or loss of signal. This signal detect circuitry can operate reliably at data rates as high as 7 Gbps.

Provided is a semiconductor laser drive circuit which is capable of preventing deterioration in an extinction ratio caused by a bias current so as to detect signals accurately and optimal for time-division telegraphy in a PON system or the like. The semiconductor laser drive circuit is equipped with a semiconductor laser, a bias current feed means which feeds a bias current to the semiconductor laser, and a modulating current feeding means which feeds a modulating current to the semiconductor laser on the basis of inputted modulating signals. The bias current is fed to the semiconductor laser at least during a period the modulating current is fed to the semiconductor laser, and stopped when the modulating current is stopped.

The invention discloses an anti-collision safety early warning system for an elevator landing door. The system comprises a mounting rack which is arranged on the front side of the landing door, the mounting rack is composed of a top rod, a left-side rod and a right-side rod, the top rod is provided with a landing door opening detection device used for detecting whether the elevator landing door isopened or not, and the opposite positions of the left-side rod and the right-side rod are provided with article existence and absence detection device used for detecting whether an article exist in front of the landing door or not; the system further comprises a control module and an alarm lamp, the landing door opening detection device, the article existence and absence detection device and thealarm lamp are connected with the control module correspondingly. According to the system, the signal is more accurate, the situation that a person easily triggers the system to cause false alarm whenthe person walks in a passageway can be avoided to the maximum degree, moreover, the influence caused by the temperature of a detected article and the temperature of the ambient environment is avoided, meanwhile, an active anti-collision intercepting device is installed, the impact risk is reduced to the largest extent through active intercepting, moreover, the system is completely independent and makes no contact with the control system of an elevator, so that no influence is caused to the elevator.

The disclosure relates to a system and a method for detecting pulses in received signals in a streaming manner. A threshold detection method is fused with a double-difference phase modulation detection method to provide a higher-performance method of pulse detection for any digital receiver. The first pulse detection technique uses a signal power threshold. When the square of the magnitude of a pulse crosses the signal power threshold, the beginning of a pulse is declared and pulse processing starts. The second pulse detection technique is model based and uses a windowed detector that crossesa phase difference threshold when the pulse has consistent second-order (in general d-th order) difference phase values within the window. The first technique has low latency and is independent of pulse width, but only operates well at SNR values greater than 15 dB. The second technique has higher latency and requires a minimum pulse width, but operates at lower (approximately 0 dB) SNR values.

The invention discloses an alternating current and direct current sensor comprising a magnetism collecting ring; a magnetic field detection module is connected to the circle of the magnetism collecting ring; the output end of the magnetism collecting ring is connected to the input end of the magnetic field detection module; the sensor further comprises a circuit module comprising an analog circuitand a digital circuit; the output end of the magnetic field detection module is connected to the input end of the analog circuit; the output end of the analog circuit is connected to the input end ofthe digital circuit; the magnetism collecting ring further comprises a first opening and closing part; and the magnetism collecting ring is opened or closed through the first opening and closing part. According to the alternating current and direct current sensor, electrified detection can be performed on power devices; the current change of the microampere level can be accurately detected; and universality to the power devices with alternating current and direct current is realized.

The invention provides a broadband vibration signal sensor and a signal processing device thereof. The broadband vibration signal sensor comprises: a base; a shell which is arranged on the base in a covering manner; a signal processing module which is arranged in the accommodating cavity or outside the accommodating cavity; a piezoelectric component which is arranged in the accommodating cavity and is stacked on the base; a piezoelectric element which is arranged in the accommodating cavity and is stacked on the piezoelectric component; and an elastic element which is arranged in the containing cavity and stacked on the piezoelectric element,whereinthe side, away from the piezoelectric element, of the elastic element is connected to the inner wall of the shell. According to the broadband vibration signal sensor provided by the invention, the piezoelectric element and the piezoelectric component are arranged, and the piezoelectric element is stacked on the piezoelectric component, so that low-frequency vibration signals and high-frequency vibration signals generated at the same position can be collected, errors caused by different mounting positions of the sensor during independent measurement are reduced, and the measurement result is more accurate.

The invention belongs to the technical field of intelligent garbage throwing, and discloses an intelligent garbage throwing control method, which comprises the steps that a login mode and a non-login mode of a garbage throwing user are set, and the user can select the login mode on a touch screen of an operation interface; in the non-login mode, an infrared sensor senses human body infrared signals within the range of a garbage throwing device, after successful sensing, a system starts the non-login mode, and a control system opens a throwing opening door for garbage throwing; in the login mode, the user enters the login mode through magnetic card swiping verification information, face recognition verification information, mobile phone number verification information or code scanning verification information, and after the information verification succeeds, the control system opens the throwing opening door for garbage throwing; and after the garbage is delivered by the user, a capacity limiting function is started, and a weighing sensor is used for weighing and detecting the garbage to obtain weighing data. According to the intelligent garbage throwing control method provided by the invention, the intelligence of garbage throwing can be improved, and the efficiency and accuracy of garbage throwing are improved.

A wheel speed sensor driving mechanism includes a motorcycle front wheel hub axle tube having chamfered driving blocks equiangularly spaced around an inner perimeter thereof, a follower unit concentrically mounted in the motorcycle front wheel hub axle tube and having chamfered ribs equiangularly arranged around the periphery of one end of the worm wheel and a mounting groove defined between each two adjacent ribs for receiving the chamfered driving blocks. Further, the number of the ribs of the follower unit is divisible by the number of the driving blocks of the motorcycle front wheel hub axle tube.