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Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '78.

10-12 April 1978

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Displaying Results 1 - 25 of 210
  • [Front cover and table of contents]

    Publication Year: 1978, Page(s): 0
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    Freely Available from IEEE
  • Design considerations for feedback amplifiers

    Publication Year: 1978, Page(s):252 - 254
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (65 KB)

    Circuit design concepts for negative feedback amplifiers are discussed. Preferred circuit architecture for the minimization of transient and static distortions is presented. A discussion of the application of these concepts to audio power amplifiers and phonograph preamplifiers is given. View full abstract»

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  • Computer analysis of transient distortion and low transient distortion amplifier design

    Publication Year: 1978, Page(s):267 - 269
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (57 KB)

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  • An error formula for iterative prefiltering frequency estimates

    Publication Year: 1978, Page(s):369 - 371
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (59 KB)

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  • A phoneme recognition system based on human audition

    Publication Year: 1978, Page(s):557 - 560
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (169 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1978, Page(s): c4
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    Freely Available from IEEE
  • Maximum likelihood pitch estimation using state-variable techniques

    Publication Year: 1978, Page(s):12 - 14
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (60 KB)

    The problem of estimating the pitch period of a speech waveform contaminated by acoustically coupled background noise is formulated to include the properties of the spectral envelope by postulating a state-variable model for the speech generation process. Applying the maximum likelihood estimation technique, the optimum processor uses a Kalman filter preprocessor to flatten the spectrum. The resul... View full abstract»

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  • Evaluation of LPC/CVSD tandem connections

    Publication Year: 1978, Page(s):326 - 329
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    The purpose of this study was to assess the effects of LPC/CVSD tandem connections and to investigate ways of improving performance. In the case of the CVSD-to-LPC connection, the CVSD quantizing noise severely affects the estimate of LPC coefficients, thereby distorting the spectral representation. An averaging technique was shown to reduce the average spectral distance from the noiseless case; h... View full abstract»

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  • A technique for pole-zero modeling of complex-valued autocorrelations

    Publication Year: 1978, Page(s): 236
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (11 KB)

    Complex-valued time series occur in many applications [1],[2] and frequently it is necessary to obtain a rational model for its autocorrelation function. A computationally efficient, noniterative method for developing such models is presented in this paper. The autocorrelation data samples are processed by a set of complex measurement units (first order recursive filters) to generate a family of a... View full abstract»

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  • Design and applications of uniform digital bandpass filter banks

    Publication Year: 1978, Page(s):499 - 503
    Cited by:  Papers (8)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    A digital bandpass filter-bank for demodulating a wideband frequency multiplexed signal into a specified number of uniform narrow band channel outputs, and conversely for modulating a set of channel inputs into a composite frequency multiplexed signal, can be realized efficiently by the combination of a suitable transform processor and a weighting network. The design and implementation of these fi... View full abstract»

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  • Dealiasing of the spectra of sampled noise

    Publication Year: 1978, Page(s):655 - 658
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (72 KB)

    Noise power spectra gained through discrete Fourier transform of sampled noise show the effects of aliasing and filtering at all frequencies, whatever the sampling rate and the filter cut-off frequencies. A self consistent method for the necessary correction of the spectra is developped, given the filter response. It is first shown that, with RLC filters, the uncorrected spectrum of white noise an... View full abstract»

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  • Extraction of speaker-specific features from spoken code sentences

    Publication Year: 1978, Page(s):279 - 282
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (78 KB)

    In the speaker-verification task speakers are assumed to be cooperative and are therefore willing to pronounce a pre-arranged code sentence. This paper deals with the extraction of speaker-specific features from a time-normalized parametric description of the code sentence. A new mml (minimum-maximum-locating) method for time-normalization is presented together with an overview of techniques used ... View full abstract»

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  • Forward-adaptive delta modulator without explicit transmission of step size

    Publication Year: 1978, Page(s):316 - 319
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (83 KB)

    The paper deals with an investigation that was carried out to determine whether a forward-adaptive delta modulator without explicit step- -size transmission could he applied successfully to the digital encoding of speech signals at low sampling rates. It was hypothesized that the quality of reproduced speech for the forward- -adaptive delta coder without explicit step-size transmission would be be... View full abstract»

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  • An at-sea system for the prediction of underwater sound propagation

    Publication Year: 1978, Page(s):245 - 247
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (58 KB)

    The WPA system was developed to aid in formulating and monitoring at-sea, underwater, acoustical measurement programs. The prototype system, constructed using a general-purpose digital computer, measures oceanographic data for use in an acoustic propagation model to predict sound propagation conditions in near-realtime at the test site. These acoustic predictions can then be used to selectively co... View full abstract»

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  • Epoch extraction from linear prediction residual

    Publication Year: 1978, Page(s):8 - 11
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (75 KB)

    An interpretation of linear prediction (LP) residual is presented by considering the effect of following factors: shape of glottal pulse, phase angles of formants at the instant of excitation, inaccurate estimation of formants and bandwidths, zeroes in vocal tract system transfer function. Effect of improper phase cancellation on the accuracy of estimated epoch position is also discussed. A method... View full abstract»

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  • Impulse response testing of acoustic spaces

    Publication Year: 1978, Page(s):820 - 823
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    The use of high energy spark discharges to measure the impulse response of rooms will be discussed. Special emphasis will be placed on reverberation measurements, but other measurements will be included. Equipment designed at Rensselaer to simplify and speed this process will be described. This equipment is extremely compact and easily transported enabling field measurements by one person. The met... View full abstract»

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  • Real-time signal processing for unbiased system identification

    Publication Year: 1978, Page(s):105 - 108
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (63 KB)

    A new procedure for unbiased estimation of system parameters is presented in which no knowledge of the statistics of the input or of the output measurement error is required. The procedure is applicable to linear, discrete-time systems and is based on the impulse response formulation. The algorthim is sequential and computationally practical for on-line application. View full abstract»

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  • Analysis and representation of composite signals by cepstral inverse filtering

    Publication Year: 1978, Page(s):214 - 217
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (83 KB)

    This paper describes a new technique for constructing representations of signals belonging to a class that includes arterial blood pressure waves and voiced speech. Called cepstral inverse filtering, it optimizes the pole and zero locations of a discrete-time system that models the signal production process. These locations are chosen so that the cepstrum of the model impulse response is a least-s... View full abstract»

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  • An optimal filter design for variable sampling rates

    Publication Year: 1978, Page(s):512 - 515
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (94 KB)

    Digital filters in future speech communications terminals should be alterable to allow for various services, bandwidths, customer loads, and digital line rates. A filter structure which maintains a constant frequency response as the sampling rate is varied is considered for such an application. The filter structure requires several times the number of design parameters than in the cascade canonic ... View full abstract»

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  • Speech generation through waveform synthesis

    Publication Year: 1978, Page(s):179 - 182
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (88 KB)

    This paper presents a time domain technique for the generation of speech which offers significant advantages over current formant synthesis and linear predictive coder (LPC) techniques. A set of basis functions in conjunction with a time-compression (and expansion) operation is shown to span the parameter space of the vocal tract model. The relationship between these basis functions and the forman... View full abstract»

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  • Linear detection filtering for the context of a least-squares estimator for signal processing applications

    Publication Year: 1978, Page(s):651 - 654
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (84 KB)

    A generalized optimal linear detection filter is derived as a certain type of least-squares estimator. With the classical matched filter as one specific case, several new fundamental detection filters are derived and compared. All derivations are carried out in the frequency domain. A graphical example is presented as an illustrated comparison of the responses of the various detection filters in b... View full abstract»

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  • 32 Kbps CCITT Compatible split band coding scheme

    Publication Year: 1978, Page(s):320 - 325
    Cited by:  Papers (16)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    This paper deals with the application of the SVCS (Split band Voice Coding Scheme) concept to the coding of a PCM channel at half the rate of the presently used 64 kbps CCITT standard. This 32 kbps coder is shown to meet the specifications as recommended by the CCITT for a PCM channel operating at 64 kbps (8kHz sampling, 8 bits/sample A-Law). In addition, channel performances have been evaluated w... View full abstract»

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  • Linear prediction and maximum entropy spectral analysis of finite bandwidth signals in noise

    Publication Year: 1978, Page(s):188 - 191
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (90 KB)

    The optimal minimum-mean-square-error discrete filters are obtained for finite bandwidth signals in noise represented by a rational pole-zero model in the spectral domain. An analytical technique called the method of undetermined coefficients is used to solve the Wiener equation for the optimal prediction coefficients. These coefficients are then used to examine (a) the frequency response of the W... View full abstract»

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  • An optimal adaptation logic for delta modulation

    Publication Year: 1978, Page(s):312 - 315
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    A new adaptive delta modulator has been introduced in this paper which essentially adapta its step size with the help of two time invariant adaptation parameters. The scheme works with the knowledge of the current channel symbol and requires no storage of previous channel symbols. Limitations of previous adaptation logics have been discussed and it has been show how the present scheme is capable t... View full abstract»

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  • Study of an adaptive lattice structure for linear prediction analysis of speech

    Publication Year: 1978, Page(s):27 - 30
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (76 KB)

    Recently a lattice structure for adaptive linear prediction using the least mean square gradient approach was proposed. This paper investigates the application of this method to speech signals, and presents a number of implementations of the Adaptive Lattice Linear Prediction (ALLP) algorithm. These implementations allow flexible tradeoffs to be made between the computational requirements and the ... View full abstract»

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