Results 1 - 10 of 501

Compressive sensing

by Richard Baraniuk - IEEE Signal Processing Mag , 2007
"... The Shannon/Nyquist sampling theorem tells us that in order to not lose information when uniformly sampling a signal we must sample at least two times faster than its bandwidth. In many applications, including digital image and video cameras, the Nyquist rate can be so high that we end up with too m ..."
Abstract - Cited by 696 (62 self) - Add to MetaCart
The Shannon/Nyquist sampling theorem tells us that in order to not lose information when uniformly sampling a signal we must sample at least two times faster than its bandwidth. In many applications, including digital image and video cameras, the Nyquist rate can be so high that we end up with too

Analog-to-digital converter survey and analysis

by Robert H. Walden - IEEE Journal on Selected Areas in Communications , 1999
"... Abstract—Analog-to-digital converters (ADC’s) are ubiquitous, critical components of software radio and other signal processing systems. This paper surveys the state-of-the-art of ADC’s, including experimental converters and commercially available parts. The distribution of resolution versus samplin ..."
Abstract - Cited by 263 (0 self) - Add to MetaCart
sampling frequency over the last six–eight years. Index Terms—Analog-to-digital converters, aperture jitter, comparator ambiguity, input-referred noise, signal-to-noise ratio, spurious-free dynamic range. I.

Asynchronous Transfer of Video

by Gunnar Karlsson , 1996
"... This paper gives an introduction to the issues involved in asynchronous video transfers. Brief overviews of video coding, rate control, multiplexing, as well as delay, error and loss control are given. Section 1. Background A collection of the world's telecommunication operators and their equip ..."
Abstract - Cited by 45 (3 self) - Add to MetaCart
This paper gives an introduction to the issues involved in asynchronous video transfers. Brief overviews of video coding, rate control, multiplexing, as well as delay, error and loss control are given. Section 1. Background A collection of the world's telecommunication operators

A Level-Crossing Flash Asynchronous Analog-to-Digital Converter

by Filipp Akopyan, Rajit Manohar, Alyssa B. Apsel
"... Distributed sensor networks, human body implants, and hand-held electronics have tight energy budgets that necessitate low power circuits. Most of these devices include an analog-to-digital converter (ADC) to process analog signals from the physical world. We describe a new topology for an asynchron ..."
Abstract - Cited by 14 (0 self) - Add to MetaCart
Distributed sensor networks, human body implants, and hand-held electronics have tight energy budgets that necessitate low power circuits. Most of these devices include an analog-to-digital converter (ADC) to process analog signals from the physical world. We describe a new topology

Sync Signal Processing for Asynchronously Sampled Video Signals

by R. Lares, A. Rothermel , 2000
"... Digital sync signal processing for asynchronously digitized video signals is presented. A simplified matched filter for sync extraction and a linear prediction method for sync pulse filtering improves image stability significantly in comparison with a conventional phase-locked-loop (PLL) approach. D ..."
Abstract - Add to MetaCart
Digital sync signal processing for asynchronously digitized video signals is presented. A simplified matched filter for sync extraction and a linear prediction method for sync pulse filtering improves image stability significantly in comparison with a conventional phase-locked-loop (PLL) approach

Converter

by Chao-yin Chen , 1993
"... approved: A delta-sigma digital-to-analog data converter is a signal conversion system that takes a digital signal as its input and produces an analog signal as its output. A digital signal is converted to an analog signal by increasing the digital clock rate to a value which is much higher than its ..."
Abstract - Add to MetaCart
approved: A delta-sigma digital-to-analog data converter is a signal conversion system that takes a digital signal as its input and produces an analog signal as its output. A digital signal is converted to an analog signal by increasing the digital clock rate to a value which is much higher than

R Digital Up and Down Converters for the

by Umts Base Stations , 2006
"... Wireless base station transceiver front-end signal processing often is performed using digital techniques. As bandwidths and IF digital-analog sampling frequencies increase, a large number of calculations are required for channelization, frequency tuning, and rate conversion. As new standards emerge ..."
Abstract - Add to MetaCart
Wireless base station transceiver front-end signal processing often is performed using digital techniques. As bandwidths and IF digital-analog sampling frequencies increase, a large number of calculations are required for channelization, frequency tuning, and rate conversion. As new standards

From theory to practice: Sub-Nyquist sampling of sparse wideband analog signals

by Moshe Mishali, Yonina C. Eldar - IEEE J. SEL. TOPICS SIGNAL PROCESS , 2010
"... Conventional sub-Nyquist sampling methods for analog signals exploit prior information about the spectral support. In this paper, we consider the challenging problem of blind sub-Nyquist sampling of multiband signals, whose unknown frequency support occupies only a small portion of a wide spectrum. ..."
Abstract - Cited by 153 (55 self) - Add to MetaCart
. Our primary design goals are efficient hardware implementation and low computational load on the supporting digital processing. We propose a system, named the modulated wideband converter, which first multiplies the analog signal by a bank of periodic waveforms. The product is then low-pass filtered

Digital-Assisted Asynchronous Compressive Sensing Front-End

by Jun Zhou, Student Member, Mario Ramirez, Samuel Palermo, Sebastian Hoyos
"... Abstract—Compressive sensing (CS) is a promising technique that enables sub-Nyquist sampling, while still guaranteeing the re-liable signal recovery. However, existing mixed-signal CS front-end implementation schemes often suffer from high power con-sumption and nonlinearity. This paper presents a d ..."
Abstract - Cited by 1 (1 self) - Add to MetaCart
Abstract—Compressive sensing (CS) is a promising technique that enables sub-Nyquist sampling, while still guaranteeing the re-liable signal recovery. However, existing mixed-signal CS front-end implementation schemes often suffer from high power con-sumption and nonlinearity. This paper presents a

DIGITAL DOWN CONVERTER IMPLEMENTATION OF ASIC USING IN IP

by B Suresh , P Krishnakumar
"... ABSTRACT Multirate systems are the systems that function at multiple sample periods. One example of such a system is a Digital Down Converter, used in digital communication receivers. Digital down conversion is a basic process of any digital communication receiver, where the bandwidth of the belove ..."
Abstract - Add to MetaCart
of the beloved channel centered at carrier frequency, is shifted down to baseband signal centered at zero frequency. Any digital communication receiver will have an Analog to Digital Converter, sampling and digitizing the selected channel at tens or hundreds of MHz, thus producing a very high data rate
Results 1 - 10 of 501