7 results about "Signal modulation" patented technology

The invention provides a power line carrier communication terminal device which comprises a power line carrier power adapter system used for allowing a strong-current power supply to be subjected to voltage reduction processing for outputting a low-voltage power supply, a signal modulation-demodulation system used for modulating/demodulating signals, and a signal transmission device used for transmitting low-voltage power supply and power line carrier signal, wherein the power output interface of the power line carrier power adapter system is connected with the power input interface of the signal modulation-demodulation system through the signal transmission device, so as to supply low-voltage direct current supply; and the power line carrier signal transmission interface of the power line carrier power adapter system is connected with the power line carrier signal transmission interface of the signal modulation-demodulation system through the signal transmission device, so as to realize the power line carrier signal communication. The device provided by the invention solves the electric safety problem, has an integrally reduced size and brings convenience for integration.

The present invention relates to a signal modulation loop for the multi-mode mobile communication. The adaptive up-conversion modulation loop is applied in the multi-mode mobile communication, and is used for signal integration for the communication system comprising the second generation communication system, the global system for mobile communication (GSM), and the third generation communication system, the wideband code division multiple access (WCDMA), so as to achieve the object of multi-mode communication by using a single modulation loop.

The invention is applied in the technical field of television, and provides a digital television signal processing chip system and the television. The system comprises a digital television signal modulation unit, a digital television signal decoding unit and an audio and video signal processing unit. The digital television signal processing chip system and the television receive a decoded audio and video signal by the audio and video signal processing unit from the digital television signal decoding unit, directly perform audio and video effect processing on the audio and video signal, and output the processed audio and video signal so as to solve the problem of relatively higher signal loss and relatively higher system cost caused by requirements on the D/A or A/D format conversion of the signal before the output of a digital television signal in the prior art, and further reduce the signal loss and system construction cost.

The invention provides a method and device for monitoring the motion state of seeds in a vibration seed tray of a seed metering device, which is mainly used for monitoring the motion state of seeds in the vibration seed tray during precision seeding and seedling raising of paddy rice and other granular grains with irregular shapes and small and medium sizes. The invention is characterized in that sensitive elements are arranged on the inner surface of the vibration seed tray of the seed metering apparatus in a multi-point manner and used for monitoring the impact signals of seeds in different areas of the seed tray; characteristic signals including seam thickness, dispersion degree and the like of seeds in a measuring area are obtained through a signal modulation circuit; and a secondary instrument collects parameters of the characteristic signals real-timely, performs multi-information fusion and calculates according to an established seed quantity monitoring model and an established seed dispersion state monitoring model so as to obtain the quantity, the distribution uniformity and the dispersion degree of seeds in the vibration seed tray. The method and device implements real-time monitoring of the motion state of seeds in the vibration seed tray of the seed metering apparatus and can provide a seed adding signal and a control signal of the vibration parameter of the seed tray.

The invention discloses an integrated ultra-small network wireless data transmission current meter. The current meter sensor is provided with a propeller, a light emitting source, a receiving photodiode, and a conducting optical fiber, and is characterized by further provided with a microcontroller, a signal conditioning circuit, and a wireless data transmission circuit. A photoelectric propeller-type flow velocity sensor emits a modulated light source. After being treated by filtering, demodulating, amplifying, and shaping, a received reflected signal forms a standard TTL signal connected tothe microcontroller. The wireless data transmission circuit is consisted of a wireless network communication control chip, a radio frequency chip, and a transmitting antenna. The software of the microcontroller is equipped with functions such as signal modulation, signal delay, regular count, data processing, power management, data transmission control, and anti-interference. According to the integrated ultra-small network wireless data transmission current meter, a flow velocity measuring device composed of a plurality of components is optimized into the integrated ultra-small network wireless data transmission current meter, and wireless flow velocity measuring is realized. A single current meter supports point-to-point wireless networking, and multiple current meters support star-type wireless networking, which can be uploaded to a local area network or the Internet to realize network management.

The invention relates to an electro-optical modulator and a system thereof. The electro-optical modulator comprises an optical signal input end, an optical signal output end, an optical signal modulation module and at least two electric signal input ends, wherein the optical signal modulation module comprises at least two modulation assemblies, the at least two modulation assemblies are connected between the optical signal input end and the optical signal output end in parallel, and each electric signal input end is correspondingly connected with one modulation assembly. In the embodiment of the invention, each modulation assembly can modulate optical signals, and a plurality of modulated optical signals can be converged together and output from the optical signal output end, so that a multi-order optical signal can be generated, and the transmission of the multi-order optical signal can be realized only by connecting an optical fiber at the optical signal output end in a butt-joint mode. Therefore, a plurality of silicon-based monolithic micro-ring modulators do not need to be used, a plurality of optical fibers do not need to be used for cooperation, and the cost can be saved.