ICASSP '82. IEEE International Conference on Acoustics, Speech, and Signal Processing

3-5 May 1982

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  • [Front cover and table of contents]

    Publication Year: 1982, Page(s): 0
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    Freely Available from IEEE
  • CCITT Activity on signal processing for integrated services digital networks

    Publication Year: 1982, Page(s):5 - 10
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (135 KB)

    This paper gives a snapshot of the international activity on standards to be set for speech, sound and picture signals processing for application in the emerging Integrated Services Digital Networks (ISDN). The ISDN is a focal point for the ongoing activity of the CCITT (International Telegraph and Telephone Consultative Committee). ISDNs are conceived as networks which have evolved from the basic... View full abstract»

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  • Hierarchical processing of structural information in artificial intelligence

    Publication Year: 1982, Page(s):11 - 16
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (225 KB)

    Most problems in signal processing have structural aspects which are difficult to solve using general methods. Use of ad hoc methods is limited to cases where structural aspects are easy to re-solve. An approach for hierarchical processing is described whereby structural aspects are resolved simultaneously with the analysis of data values. An effective use of a hierarchical structure puts strong r... View full abstract»

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  • Human-machine interaction and digital signal processing

    Publication Year: 1982, Page(s):17 - 19
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (63 KB)

    Human-machine interaction is getting more attention as more people are confronted with computing systems. The relationship with digital signal processing is old, complex and rich. Ability to provide services based on merging different kinds of signals such as text, graphics, images and speech, is a challenge for digital signal processing specialists and computer scientists. Major improvement in hu... View full abstract»

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  • The design of optimal DFT algorithms using dynamic programming

    Publication Year: 1982, Page(s):20 - 23
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (82 KB)

    A broad class of efficient, discrete Fourier transform algorithms is developed by partitioning short DFT algorithms into factors. The factored short DFT's are combined into longer DFT's using a prime factor algorithm (PFA). By exploiting a property which allows some of the factors to commute, a large set of possible DFT algorithms is generated which contains both the prime factor algorithm and the... View full abstract»

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  • Two dimensional DFT using mixed time and frequency decimations

    Publication Year: 1982, Page(s):24 - 27
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (84 KB)

    The well-known decimation-in-time and decimation-infrequency FFT algorithms have recently been combined into a single and more efficient one, the Mixed Decimation FFT algorithm. On the other hand, an efficient way to perform a two dimensional DFT computation is to use decimation-in-time or decimation-infrequency in both dimensions simultaneously. In this paper the above two ideas are combined to g... View full abstract»

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  • Recursive calculation of Fourier transform of discrete signal

    Publication Year: 1982, Page(s):28 - 31
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (62 KB)

    Two algorithms for the calculation of Fourier transform of a discrete signal are derived from the known recursive method for polynomial evaluation. The first algorithm processes the elements of the discrete signal in a natural order of elements and the second one in the reverse order. Both algorithms are modified for operation with real numbers only. The relation of these algorithms to the well kn... View full abstract»

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  • Performance and computation ranking of fast unitary transforms in applications

    Publication Year: 1982, Page(s):32 - 35
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (81 KB)

    For several signal processing applications, the usefulness of Fast Unitary Transforms (FUT) is now well recognized [1-7]. For signal representation, filtering and encoding, it is well known that the Karhunen-Loeve (KL) Transform, based on signal statistics, is optimum in various senses, but the KL Transform is slow. Suboptimum FUT's allow a trade-off between performance and speed. In this paper, w... View full abstract»

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  • A polynomial transform approach to transmultiplexing

    Publication Year: 1982, Page(s):36 - 39
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (102 KB)

    In this paper, we introduce a new algorithm for the implementation of uniform digital bandpass filter banks. This technique first uses a conventional filter breakdown process to convert a set of fast bandpass filters into a set of slow bandpass filters of reduced length, plus an odd-time DFT. The slow bandpass filters are computed by DFTs, and it is shown that the combination of these DFTs with th... View full abstract»

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  • Fast algorithms for signal processing using finite field operations

    Publication Year: 1982, Page(s):40 - 43
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (84 KB)

    A signal processing system employing digital arithmetic can be made equivalent to a set of interconnected subsystems each using finite field operations to alleviate effects of round-off noise, particularly in recursive structures. The realization of the subsystems involves the multiplication of polynomials over a finite field. Cyclic convolutions may be represented as polynomial multiplications, i... View full abstract»

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  • On the computational complexity of bilinear forms evaluation over a body of quaternions

    Publication Year: 1982, Page(s):44 - 47
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (82 KB)

    In this article the problem of computing a set of bilinear forms is considered. Our goal is to find practical algorithms for a production of two 2 × 2 matrices over a real fields complex numbers, quaternions, evaluation of convolution which requires nearly twice as smaller productions as a known algorithms. View full abstract»

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  • On the accuracy of 2-D digital filter realizations using logarithmic number systems

    Publication Year: 1982, Page(s):48 - 51
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (103 KB)

    This paper deals with the approximation of 2-D digital filters implemented with logarithmic number systems. Such systems guarantee accuracy and speed, then they are attractive for real-time digital processing of images. The limits on the maximum useful word length are discussed, and an optimization procedure for the base of the logarithmic number system is proposed. The possibility of designing ef... View full abstract»

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  • Quantization error and limit cycles analysis in residue number system coded recursive filters

    Publication Year: 1982, Page(s):52 - 55
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (100 KB)

    The paper discusses the Residue Number System (RNS) implementation of second order recursive digital filter sections. The RNS offers the advantage of using integer based arithmetic operations and a simple hardware realization involving arrays of look up tables stored in high density ROMs, In residue number system scaling is necessary to keep the data within the limited dynamic range. The effects o... View full abstract»

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  • Analysis of errors in residue number system (RNS) based IIR digital filters

    Publication Year: 1982, Page(s):56 - 59
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (102 KB)

    The problem of analyzing errors in Residue Number System (RNS) based IIR Digital filters is considered in this paper. There are basically three types of errors in RNS based digital filters, They are coefficient quantization errors(1), scaling errors and data errors. In particular the problem of roundoff errors which plagues fixed point digital filters is absent in RNS digital filters because of th... View full abstract»

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  • Failure resistant digital filters based on residue number system product codes

    Publication Year: 1982, Page(s):60 - 63
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    Residue number system product codes are proposed for the design of self-checking digital filters. It is shown that product codes require redundancy that is similar to, but slightly less than that of systematic codes for simultaneous overflow detection and single error correction. The design of a product code error checker is presented, and compared to a systematic code error checker. Also, a new c... View full abstract»

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  • Quantization and truncation effects in the design of adaptive digital filters

    Publication Year: 1982, Page(s):64 - 68
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (129 KB)

    This paper presents an implementation of an adaptive digital filter. The hardware is outlined and the limitations of the design discussed. The effect of rounding on the filter characteristics is described. A method of improving filter performance, when using low adaptive gains, by means of the addition of a dither signal to the coefficient updates is described. Experimental results from the implem... View full abstract»

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  • Fixed-point error analysis of rectangular transform

    Publication Year: 1982, Page(s):69 - 72
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (157 KB)

    The fixed-point error analysis of long length RT's is presented assuming sign-magnitude or 1's complement arithmetic. The errors introduced by the input-addltion, multiplication and the output-addition stages are separately considered in each dimension and are suitably combined to give the average output noise variance. The various error components signifying the characteristics error parameters o... View full abstract»

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  • The application of dynamic programming to the optimal ordering of digital filter sections

    Publication Year: 1982, Page(s):73 - 76
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (108 KB)

    Dynamic Programming has been applied to a number of digital signal processing problems. In this paper we discuss its well known application to the problem of determining the optimum order of sections in a digital filter realization. We show that the method is quite insensitive to the specific details of the problem; it is applicable over a wide range of possible optimality criteria, various kinds ... View full abstract»

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  • Digital audio mixer: A VLSI approach

    Publication Year: 1982, Page(s):77 - 80
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (116 KB)

    Audio mixing panels have traditionally been implemented using analog circuits. The limitations of analog circuits, noise and flexibility, have been outweighed by the the power requirements and complexity of digital alternatives. The power consumption of digital processing circuits can be reduced by the use of VLSI circuits. The primary remaining limitation, circuit complexity, is minimized by usin... View full abstract»

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  • Some design issues in digital signal processing for digital-audio systems

    Publication Year: 1982, Page(s):81 - 84
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (97 KB)

    Considerations leading to the introduction of the concept of an integrated digital-audio system are presented. Emphasis is placed on its relation to different application areas of digital signal processing. In digital-audio systems some signal processing algorithms can be applied which are unique in the sense that they are related to the acoustic environment. The resulting large signal delays pose... View full abstract»

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  • The Lucasfilm audio signal processor

    Publication Year: 1982, Page(s):85 - 88
    Cited by:  Papers (1)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (129 KB)

    The requirements of audio processing for motion pictures present several special problems that both make digital processing of audio very desirable and relatively difficult. The difficulties can be summarized as follows: (1) Large amounts of numerical computation are required, on the order of 2 million integer multiply-adds per second per channel of audio, for some number of channels. (2) The exac... View full abstract»

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  • Signal processing for the analysis of musical sound

    Publication Year: 1982, Page(s):89 - 92
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (114 KB)

    The signal environment of musical sound is a complex one with significant underlying structure. Past attempts at machine understanding of musical sound have been fraught with problems. We have been taking a new approach to the problem - using advanced signal processing algorithms as "sources of knowledge" in an Expert System developed to understand the sound. The emphasis in this paper is on the s... View full abstract»

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  • A 2-channel, 16-bit digital sampling frequency converter for professional digital audio

    Publication Year: 1982, Page(s):93 - 96
    Cited by:  Papers (14)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (69 KB)

    A digital sampling frequency converter for arbitrary ratios of sampling frequencies is presented. It is based on a multistage interpolating filter, and on a novel time-domain control of the filter stages by signals derived from the sampling frequency clocks. Time-domain resolution of ±300 picoseconds is obtained, compatible with digital audio of 16-bit resolution. In addition to the filte... View full abstract»

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  • Digital parametric filters for studio mixing desk

    Publication Year: 1982, Page(s):97 - 100
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (84 KB)

    Design and implementation of real-time filters for digital audio require handling large words and multiplication rates over 200 000 operations/second. The present paper report on theoretical and practical work done at T. D. F. to realize a dedicated processor based on commercial slice processors and multipliers. Flexibility and power of this equipment make it a very efficient research tool since i... View full abstract»

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  • Sample-rate conversion by arbitrary ratios

    Publication Year: 1982, Page(s):101 - 104
    Cited by:  Papers (10)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (95 KB)

    The paper suggests and describes two methods for sample-rate conversion by arbitrary ratios, either between any two fixed or varying sampling frequencies. The first method is based on an impulse-invariant transform of an analog filter. A parallel form realization structure is presented, The second method combines regular IIR- or FIR-interpolators for integer or rational conversion ratios with low-... View full abstract»

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