Showing papers in "Digital Signal Processing in 1991"

TL;DR: The system described here is capable of accurately verifying an individual’s claimed identity from a short sample of his or her speech, and a rationale was developed for determining the size of the test required to allow hypotheses regarding the system's true error rates to be tested with stated confidence levels.

TL;DR: This test exhibits the desirable property that its PFA is independent of the covariance matrix (level and structure) of the actual noise encountered; i.e., it is a CFAR (constant false alarm rate) test.

TL;DR: Fed-Std-1016 has been endorsed for use in the STU-III and is embedded in the proposed Land Mobile Radio standard that includes signaling and forward error correction to form an 8000 bps system that could have many far-reaching applications.

TL;DR: A new method based on the assumption that, for voiced speech, a perceptually accurate speech signal can be reconstructed from a description of the waveform of a single, representative pitch cycle per interval of 20-30 ms is presented, which retains the natural quality of coders which encode the entire waveform, but requires a bit rate close to that of the parametric coders.

TL;DR: During the late sixties and early seventies, there was a great deal of research activity related to digital orthogonal transforms and their use for image data compression, and the Karhunen-Loeve transform evolved as the optimal transform for comparison purposes and yet there was no efficient algorithm available to compute it.

TL;DR: The methods and motivation for VAA data collection and validation procedures, the current contents of thedatabase, and the results of exploratory research on a 1088-speaker subset of the database are described.

TL;DR: The performance of several objective methods is quite promising, and may justify their use in many cases where listener tests can be augmented or replaced completely, and standards defining these objective measures and their intended applications can be expected in the near future.

TL;DR: Signal subspace spectral estimation algorithms of the MUSIC type [l-3] are particularly effective for estimating the direction of arrival (DOA) of incoming plane wave signals arising from point emission sources in the far field of spatial phased arrays.

TL;DR: A new fast algorithm based on an orthogonal decomposition approach, which has significantly improved numerical behavior over the Cholesky approach is reported.

TL;DR: O Ongoing research has as an objective, performance evaluation of various strategies for recovery from windshear encountered during the approach-to-landing, including the benefit of forward looking sensors.

TL;DR: An improved “frequency-weighted” method of spectral estimation that has theoretical foundations relating it to asymptotic maximum likelihood and minimum information divergence procedures as well as the linear predictive procedures popular for speech analysis is described.

TL;DR: From the Δ−Σ A/D converters, which allow devices to be fabricated in an inexpensive CMOS process, to the complex digital signal processing used in power metering, signal processing plays a significant role in realizing these devices.

TL;DR: Experimental results show that this coder out performs than other coders such as Djohn, EZW, SPIHT, Novel algorithm etc exists in the literature in terms of coding efficiency and in computation.

TL;DR: When I left Europe several years ago and came to the United States to pursue a graduate degree, many of my friends and colleagues wondered why; I was simply looking for a change, for a good excuse to broaden my horizons in more ways than academic, and most of all for an environment with a large “derivative” one in which change forever keeps you on your toes.

TL;DR: An early realization that computer architecture (parallel computation) must be coupled to algorithm design (two-dimensional signal processing) is seen, and a focus on “classical” algorithmic approaches that combine at least two of the three computational axes is held.

TL;DR: This paper studies the problem of testing pipelined DSP hardware for test pattern generation (TPG) for pipelines is very different from the general test generation problem for sequential circuits.

TL;DR: The use of bitand digit-serial arrays in digital designs is attractive, because of the large savings in chip area that are possible with such designs as well as the comparative ease with which such designs can be conceived and fabricated.

TL;DR: This article will attempt to answer some of the veil of mystery from signal processor design and selection and raise some hackles, provoke controversy, and generate more questions than I answer and lead to a better understanding of signal processing systems.

TL;DR: Probably the first necessary step in adopting the frequency approach to numerical analysis is to realize that there are serious defects in the polynomial approach.

TL;DR: In this tutorial on preprocessing, insight is provided into the importance of preamplification for combating system noise and it is shown that it is the energy, not necessarily the power, in the signal that determines the performance of a processor algorithm.

TL;DR: An explosion in applications is seen, including the coding of still images for transmission over integrated services digital networks (ISDNs), the transmission of moving images of lesser quality for picture phones, and storage on compact discs of still and moving images (compact disc ROM and interactive compact discs).