Digital signal

About: Digital signal is a research topic. Over the lifetime, 44213 publications have been published within this topic receiving 345279 citations.

Picture display device

Abstract: PURPOSE:To extremely improve display quality by preventing the unevenness of luminance or a flicker from occurring, preventing the brightness of a display from being reduced and preventing such a failure that the natual hue of a picture which should be displayed on a screen is deteriorated from occurring based on the difference of the visual sense of a person with respect to respective colors CONSTITUTION:Respective chrominance signals from signal conductors 10R, 10G and 10B are inputted to A/D conversion devices 20R, 20G and 20B provided for every color and converted to a digital signal from an analog signal Besides, storage devices 31-39 respectively storing the chrominance signals by one field are connected to the conversion devices 20R, 20G and 20B The chrominance signals from the storage device group 30 are respectively inputted to a writing time modulation device 82 and a time base modulation device 40 The modulation device 82 is a circuit modulating the writing time of a signal for display on a picture element and the modulation device 40 is a circuit expanding or compressing the chrominance signal of every color from the storage device group 30 in the direction of a time base

Digital loop transceiver having a power up/down circuit

Abstract: In a digital telephone system, a digital private automatic branch exchange (PABX) has a plurality of digital line cards for coupling the PABX to respective digital subscriber sets via subscriber lines. In each digital line card, a digital loop transceiver operates in a master mode to couple the digital data bus of the PABX to the subscriber line via a subscriber line interface circuit in response to control signals provided by the PABX on the control bus thereof. In each digital subscriber set, a digital loop transceiver operates in a slave mode to couple the subscriber set to the subscriber line via a subscriber line interface circuit and to provide the several control signals required by the other components thereof. The digital loop transceivers may provide communication on each of two communication channels, with the digital data words of the first channel being treated the same as the digital data words of the second channel. In each digital loop transceiver, a power up/ power down circuit powers down all circuitry associated with each digital loop transceiver except for enough circuitry to detect an incoming data burst. Power up of each digital loop transceiver is accomplished via a power control portion which controls a data transmission controller in response to a detect signal and a power enable signal. A data control portion controls the transmission of bursted data to guarantee the avoidance of data collisions in a two-wire full duplex communication system.

Device operable with an excellent spectrum suppression

Abstract: In a device for use in processing a baseband input signal and a carrier signal into an envelope output signal, a processing unit (3) is supplied with the baseband input signal and the carrier signal and produces, as a produced signal, a modulated signal and a non-modulated signal one at a time in response to a burst control signal. A waveform generating unit (2) is supplied with the burst control signal and generates a control signal. An amplifying unit (4) is supplied with the produced signal and the control signal and amplifies the produced signal to make the envelope output signal represent an envelope of the produced signal and to produce the envelope output signal with an excellent spectrum suppression. Alternatively, the processing unit may be supplied with the control signal instead of the burst control signal.

Triboelectric Nanogenerator as a Self-Powered Communication Unit for Processing and Transmitting Information.

Abstract: In this paper, we demonstrate an application of a triboelectric nanogenerator (TENG) as a self-powered communication unit. An elaborately designed TENG is used to translate a series of environmental triggering signals into binary digital signals and drives an electronic-optical device to transmit binary digital data in real-time without an external power supply. The elaborately designed TENG is built in a membrane structure that can effectively drive the electronic-optical device in a bandwidth from 1.30 to 1.65 kHz. Two typical communication modes (amplitude-shift keying and frequency-shift keying) are realized through the resonant response of TENG to different frequencies, and two digital signals, i.e., "1001" and "0110", are successfully transmitted and received through this system, respectively. Hence, in this study, a simple but efficient method for directly transmitting ambient vibration to the receiver as a digital signal is established using an elaborately designed TENG and an optical communication technique. This type of the communication system, as well as the implementation method presented, exhibits great potential for applications in the smart city, smart home, password authentication, and so on.

Digital image sensor with on -chip programmable logic

Abstract: An image sensor, including a substrate having formed thereon by a CMOS process a digital sensor array having a plurality of digital pixel sensors which output analog signals corresponding to a desired image. The digital sensor array further includes supporting circuitry for converting the analog signals produced by the digital pixel sensors to digital signals corresponding to the desired image. Filter circuitry, for converting the digital signals to digital values representative of the light intensity impinging upon the plurality of digital pixel sensors, is also formed on the substrate using CMOS fabrication processes. Memory devices, including a data memory, a threshold memory, and a time index memory are formed on the substrate using CMOS fabrication techniques. A clock circuit is also formed on the substrate using CMOS fabrication processes. Programmable logic structures are formed on the substrate using CMOS fabrication processes. The programmable logic structure can be configured into a variety of circuitry or routing so as to facilitate customization or specialization of the image sensor.