International Conference on Acoustics, Speech, and Signal Processing

3-6 April 1990

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  • ICASSP 90. 1990 International Conference on Acoustics, Speech and Signal Processing (Cat. No.90CH2847-2)

    Publication Year: 1990
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    Freely Available from IEEE
  • A fast computational algorithm for the QR-like decomposition of the modified covariance method of linear prediction

    Publication Year: 1990
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (106 KB)

    Summary form only given. A fast QR algorithm for the batch modified covariance method of linear prediction that is the companion to the fast Cholesky algorithm has been developed. A Fortran program that performs the QR solution for the linear prediction parameters has also been developed. The numerical accuracies of the fast QR algorithm and fast Cholesky algorithm solutions for the least-squares ... View full abstract»

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  • CADiSP-a graphical compiler for the programming of DSP in a completely symbolic way

    Publication Year: 1990, Page(s):1077 - 1080 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The CADiSP system is discussed as an experimental software development environment for digital signal processing (DSP). The approach of using an interactive graphical editor for specifying systems by interconnecting black boxes hierarchically on different levels of abstraction and then automatically translating the block diagram into executable code is discussed. Basic building blocks for the most... View full abstract»

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  • Detection of a constant signal using the bi-covariance function

    Publication Year: 1990, Page(s):2515 - 2518 vol.5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The bispectrum cancels certain types of noise effects and detects certain types of nonlinear interactions. Two detectors based on the bicovariance, the Fourier inverse of the bispectrum, have been proposed for these reasons. The performance of these detectors is simulated and compared to the performance of the linear and the sign detectors for Gaussian noise, Gaussian noise corrupted by a sinusoid... View full abstract»

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  • Doppler frequency estimator performance analysis

    Publication Year: 1990, Page(s):2511 - 2514 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    A novel realistic model for Doppler signals is investigated. The intended application is the accurate estimation of a train's speed using an onboard Doppler radar. The signal is shown to be conveniently modeled by a sine wave amplitude modulated by an autoregressive process. The spectral properties of this model are derived and used to define a relevant frequency estimation algorithm based on conv... View full abstract»

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  • Code generation for the AT&T DSP32

    Publication Year: 1990, Page(s):1073 - 1076 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The use of compiler generation tool sets (CGTSs) targeting programmable digital signal processing (DSP) microprocessors (PDSPs) is examined. Such tool sets allow separate construction of all compiler components: language-dependent front ends, internal optimization phases, and machine-dependent back ends for target code generation, including post-generation machine code optimization. In order to co... View full abstract»

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  • VLSI design of multi-rate arrays for DSP algorithm

    Publication Year: 1990, Page(s):1049 - 1052 vol.2
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    Multirate arrays where the data transmission rate at different paths varies are introduced. Using a multirate clock, transparent data or data with small delays are propagated K times faster than the computed data, achieving a speedup of a factor of K as compared to systolic arrays. A new synthesis method for a class of nonuniform recurrence equations named DURE (directional unifo... View full abstract»

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  • Optimal detection and separation of chirp signals

    Publication Year: 1990, Page(s):2507 - 2510 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    The finite Zak transform is introduced into the problem of signal detection in a noisy environment. The main advantage of the Zak transform over the Wigner distribution approach is the linearity. Thus there are no cross terms in a multicomponent signal environment. The theory has been applied to separate chirp signals View full abstract»

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  • On application of two-dimensional AR modeling of Wigner distribution for efficient coding and effective filtering

    Publication Year: 1990, Page(s):2463 - 2466 vol.5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The use of two-dimensional AR (autoregressive) modeling of the Wigner distribution (WD) to perform efficient coding of WD images and effective filtering of troublesome cross WD components and white noise components is demonstrated. The AR models are obtained using two-dimensional autocorrelation fitting techniques that are based on nonsymmetric half plane or quarter plane model support. The two-di... View full abstract»

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  • KINFIDA: an object-oriented model-based digital filter design assistant

    Publication Year: 1990, Page(s):1069 - 1072
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    KINFIDA (knowledge-based intelligent filter design assistant), a hybrid knowledge-based system with a model-based reasoning architecture for digital filter design, is described. It extends the concept of an isolated digital signal processing CAD tool and provides a closed-loop design environment where the system expertise can grow incrementally with minimal effect on the controls and the reasoning... View full abstract»

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  • Time-frequency concentrated basis functions

    Publication Year: 1990, Page(s):2459 - 2462 vol.5
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The notion of concentration is discussed, and concentration with respect to an operator is defined. This is related to the idea of concentration based on second moments in time and frequency. A class of signals Bw(μ) concentrated with respect to an operator W is introduced. A best n-dimensional approximating subspace for this class is shown to be the space ... View full abstract»

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  • CELP coding for land mobile radio applications

    Publication Year: 1990, Page(s):465 - 468 vol.1
    Cited by:  Papers (10)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    The performance of the Proposed Federal Standard 1024 8000-b/s system for digital land mobile radio on a 12.5- or 6.25-kHz channel is described. The system contains the Proposed Federal Standard 1016 4800-b/s code excited linear predictive (CELP) voice coder developed by the US DOD and AT&T Bell Laboratories. The system is error protected with 2400 b/s and has 800 b/s for overhead signaling. T... View full abstract»

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  • On using the adaptive delay filter in sparse identification and extensions to sparse deconvolution and sinusoid detection

    Publication Year: 1990, Page(s):2503 - 2506 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The drawbacks of using the adaptive delay filter for plant identification are discussed. These drawbacks are due to regression and gain estimation errors and the filter's limitations under colored excitation hypotheses. After proposing simple solutions for both drawbacks, the authors show how the limitations can be solved by using different known techniques, such as dynamic programming or by apply... View full abstract»

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  • On the identification of a third-order Volterra nonlinear system using a frequency-domain block RLS adaptive algorithm

    Publication Year: 1990, Page(s):2407 - 2410 vol.5
    Cited by:  Papers (18)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    A frequency-domain block recursive least-square adaptive algorithm is presented for the identification of nonlinear systems which can be modeled by a third-order Volterra series. The identification algorithm is based on the application of the Volterra theory and adaptive signal-processing techniques. The approach does not assume any particular statistics of the input. Moreover, the adaptive algori... View full abstract»

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  • Affine smoothing of the Wigner-Ville distribution

    Publication Year: 1990, Page(s):2455 - 2458 vol.5
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    A formalism of signal energy representations depending on time and scale is presented. Precise links between time-frequency and time-scale energy distributions are provided. It is known that a full description of the former is given by Cohen's class, which can be described as a generalization of the spectrogram appropriately parameterized by a smoothing function acting on the Wigner-Ville distribu... View full abstract»

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  • Vector sum excited linear prediction (VSELP) speech coding at 8 kbps

    Publication Year: 1990, Page(s):461 - 464 vol.1
    Cited by:  Papers (127)  |  Patents (63)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    The vector sum excited linear prediction speech coder is presented. It utilizes a codebook with a structure that allows for a very efficient search procedure. Other advantages of the VSELP codebook structure are discussed, and a detailed description of an 8-kb/s VSELP coder is given. This coder was selected by the Telecommunications Industry Association (TIA) as the standard for use in North Ameri... View full abstract»

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  • Parameter estimation of superimposed signals by dynamic programming

    Publication Year: 1990, Page(s):2499 - 2502 vol.5
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The problem of fitting a model composed of a number of superimposed signals to noisy data using the maximum-likelihood criterion is considered. A local interaction model is established through the study of Cramer-Rao bound. For such models, the global extremum of the criterion is found efficiently by dynamic programming. An approximate version of the algorithm is developed to further reduce the co... View full abstract»

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  • The extraction of range and Doppler from fourth-order spectra

    Publication Year: 1990, Page(s):2403 - 2406 vol.5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    A method for extracting range and Doppler information from a Doppler-spread active sonar echo is proposed. The Doppler spreading is based on Van Trees' model, and the method is based on the fourth-order cumulant spectrum. Specifically, from the envelope of an amplitude modulated coded pulse train the spectrum and fourth-order cumulant spectrum are derived. It is demonstrated by analysis and simula... View full abstract»

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  • Vectorizing IIR filters

    Publication Year: 1990, Page(s):1045 - 1048 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    In the clustered look-ahead technique for pipelining a recursion, an Nth-order infinite impulse response (IIR) filter is transformed into an (N+M-1)th-order filter which can be implemented as a vector recursion, with M output values determined simultaneously. A difficulty with pipelining in this manner is that the transformed filter is not necessarily stable, fo... View full abstract»

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  • Adaptive subband coder design for HDTV signal transmission

    Publication Year: 1990, Page(s):2117 - 2120 vol.4
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    An adaptive subband coder design for high-quality high-definition television (HDTV) signal transmission through single or multistage coding is presented. In the coder, quadrature mirror filters (QMFs) decompose the input signal into four bands. An adaptive discrete cosine transform is adopted for horizontal-low and vertical-low signal coding. One-dimensional differential pulse-code modulation (DPC... View full abstract»

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  • A 2 ms-delay adaptive code excited linear predictive coder

    Publication Year: 1990, Page(s):457 - 460 vol.1
    Cited by:  Papers (3)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The technique proposed is based on a feedback adaptation of the LPC and LTP (long-term prediction) coefficients on a block basis, and on an adaptive linear code-book vector quantizer. The authors designed a 12 kb/s coding scheme with high quality, low delay, and low complexity. A 4 kb/s block protection can then be applied to ensure a robust operation at 16 kb/s. The authors give a detailed descri... View full abstract»

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  • Multiscale inverse filtering

    Publication Year: 1990, Page(s):2495 - 2498 vol.5
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The advantages of a time-scale analysis for the detection of transient signals are demonstrated. The transients discussed have a shape known to within a scale factor and may be partially overlapping. Only cases of high SNR (signal-to-noise ratio) are considered. After a short introduction to the wavelet transform, the links between detection and time-scale analysis are given. They are illustrated ... View full abstract»

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  • Systolic architectures for radar CFAR detectors

    Publication Year: 1990, Page(s):1025 - 1028 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    Radar constant false alarm rate (CFAR) detectors, which are adaptive threshold detectors used to compensate for unknown noise environments, are discussed. Although the signal processing theory for CFAR detection is advanced, applications lag because of the high throughput required in radar. This intensive computational requirement (a data rate of at least 20 MHz for most search radars) cannot be m... View full abstract»

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  • Implementation of a parallel Jacobi algorithm on multiple DSP96002 digital signal processors

    Publication Year: 1990, Page(s):957 - 960 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    A multiprocessor architecture is presented using a number of Motorola DSP96002 digital signal processors in parallel with no required glue logic. It is shown how this configuration can be used efficiently to implement a parallel Jacobi algorithm. Processor overhead is practically negligible because of the DSP96002 dual bus structure, its independent DMA channels, and its host interfaces. The examp... View full abstract»

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  • Instantaneous bandwidth for signals and spectrogram

    Publication Year: 1990, Page(s):2451 - 2454 vol.5
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    The concept of instantaneous bandwidth, which is an indication of the frequency spread at a given time, is developed. It is shown that the global bandwidth of a signal can naturally be broken up into an AM and an FM contribution and that the AM contribution comes from averaging the instantaneous bandwidth. The instantaneous bandwidth for the spectrogram is derived, and series expansions in terms o... View full abstract»

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