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Digital signal

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


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Patent
Nanba Hiromi1, Mizutani Toru1
31 Jan 2002
TL;DR: A semiconductor integrated circuit comprises a digital-to-analog converter for converting a digital signal into an analogue signal to output an analogue current signal, and a current-tovoltage converter to convert the analog current signal into the voltage signal in which a factor variable in accordance with manufacturing process conditions and/or environmental conditions has been corrected as mentioned in this paper.
Abstract: A semiconductor integrated circuit comprises a digital-to-analogue converter for converting a digital signal into an analogue signal to output an analogue current signal, a current-to-voltage converter for converting the analogue current signal output by the digital-to-analogue converter, into an analogue voltage signal whose level has been controlled, and a filter for filtering the analogue voltage signal converted by the current-to-voltage converter. The current-to-voltage converter converts the current signal into the voltage signal in which a factor variable in accordance with manufacturing process conditions and/or environmental conditions has been corrected.

118 citations

Patent
09 Feb 1987
TL;DR: In this paper, a satellite communications system for transmitting medical related images from a mobile unit to a central headquarters and then sending back diagnostic analysis from the central headquarters to the mobile unit by having a high resolution camera and a video compressor for converting high resolution images into voltage analog signals, a modulator for converting the voltage analogue signals into a narrow band width and low frequency signal, a satellite system for transmission and receiving images and analyses, a demodulator, a video expander for converting voltage analog signal into a digital signal, buffer for buffering the digital signal.
Abstract: A satellite communications system for transmitting medical related images from a mobile unit to a central headquarters and then sending back diagnostic analysis from the central headquarters to the mobile unit by having a high resolution camera and a video compressor for converting high resolution images into voltage analog signals, a modulator for converting the voltage analog signals into a narrow band width and low frequency signal, a satellite system for transmitting and receiving images and analyses, a demodulator for converting the narrow band width and low frequency signal back into a voltage analog signal, a video expander for converting the voltage analog signal into a digital signal, a buffer for buffering the digital signal, a high resolution monitor for converting the buffered digital signal into a high resolution digitized image.

117 citations

Patent
25 Apr 1988
TL;DR: In this article, a null condition is defined when the received amplitude of the energy field is such that when added to the complementary signal a cancellation effect occurs; the null condition may be transient or continuous in nature depending on the mode of operation and the nature of the field disturbance.
Abstract: An energy field disturbance sensor comprises an energy field emission means such as a light emitting diode; the emitted field may contain a time-varying component An energy sensing device such as a photodiode receives the field energy to produce a sensing signal related to the intensity of the emitted field and any disturbance therein A second signal complementary to the sensed signal is added in a summing junction to the sensing signal to create a summation signal If the emitted energy field contains a time-varying component, a detection circuit is used to sample the summation signal to convert the summation signal to a proportional detection signal An analog to digital converter converts the detection signal to a digital form Digital processing circuitry modulates the amplitude of the complementary signal or the intensity of the energy field according to the desired mode of operation, and in accordance with the behavior of the digital detection signal and external control signals The circuitry is capable of creating a null condition in the detection signal when the received amplitude of the energy field is such that when added to the complementary signal a cancellation effect occurs; the null condition may be transient or continuous in nature depending on the mode of operation and the nature of the field disturbance

117 citations

Journal ArticleDOI
TL;DR: New quadrature mirror filter structures for the frequency domain analysis and synthesis of digital signals are introduced and a new scheme which reduces the computational complexity by about a factor of two over conventional QMF implementations is proposed.
Abstract: This paper introduces new quadrature mirror filter (QMF) structures for the frequency domain analysis and synthesis of digital signals. The conventional QMF technique is first extended to cover complex quadrature mirror filters (CQMF) in which a digital signal is split into N adjacent complex subbands where the real and imaginary parts are subsampled by 1/2N with respect to the original signal. The computational complexity of QMF banks is then analyzed and a new scheme which reduces the computational complexity by about a factor of two over conventional QMF implementations is proposed. Finally, the filter design tradeoffs are discussed and the microprogramed implementation of QMF banks is evaluated.

117 citations

Journal ArticleDOI
TL;DR: The proposed level shifter circuit can convert low- voltage digital input signals into high-voltage digital output signals and achieves low-power operation because it dissipates operating current only when the input signal changes.
Abstract: This paper presents a level shifter circuit capable of handling extremely low-voltage inputs. The circuit has a distinctive current generation scheme using a logic error correction circuit that works by detecting the input and output logic levels. The proposed level shifter circuit can convert low-voltage digital input signals into high-voltage digital output signals. The circuit achieves low-power operation because it dissipates operating current only when the input signal changes. Measurement results demonstrated that the circuit can convert a 0.23-V input signal into a 3-V output signal. The power dissipation was 58 nW for a 0.4-V 10-kHz input pulse.

117 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20239
202225
2021190
2020755
2019942
2018915