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Applications of Signal Processing to Audio and Acoustics, 1999 IEEE Workshop on

20-20 Oct. 1999

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  • Proceedings of the 1999 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics. WASPAA'99 (Cat. No.99TH8452)

    Publication Year: 1999
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    Freely Available from IEEE
  • Author index

    Publication Year: 1999, Page(s): 0_14
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    Freely Available from IEEE
  • An investigation of the impact of torsion waves and friction characteristics on the playability of virtual bowed strings

    Publication Year: 1999, Page(s):87 - 90
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    “Playability” is measured for variations in a bowed string simulation model. The variations studied are (1) the effect of torsion waves, and (2) the effect of the choice of friction model. It is found that (1) elimination of torsion wave simulation does not degrade playability, and (2) the more recently developed “plastic” bowed-string friction model, in which the frictiona... View full abstract»

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  • Digital sound synthesis based on transfer function models

    Publication Year: 1999, Page(s):83 - 86
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    Various methods for sound synthesis based on physical models have been presented. They start from a continuous model for the vibrating body, given by partial differential equations (PDEs), and employ proper discretization in time and space. Examples are waveguide models or finite difference models. A different approach is presented here. It is based on a multidimensional transfer function model de... View full abstract»

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  • Joint estimation of vocal tract filter and glottal source waveform via convex optimization

    Publication Year: 1999, Page(s):79 - 82
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    For singing synthesis applications, it is essential to generate natural voiced sound, since singing is nearly 95% voiced. In this paper, the linearly separable source-filter model is assumed for voiced sound. A convex optimization method is then applied to estimate the vocal tract filter and glottal source waveform jointly. The merits of using convex optimization methods are computational efficien... View full abstract»

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  • Optimization of multirate crossover filters

    Publication Year: 1999, Page(s):63 - 66
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    A digital crossover filter design procedure is developed based on multirate complementary filters. The crossover optimization procedure includes the determination of the optimal multirate filter structure and the overall optimization of the cascaded linear phase multirate FIR filter system. The filter structure can be optimized for several cost criteria e.g. for minimal run-time memory or computat... View full abstract»

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  • Application of the phase vocoder to pitch-preserving synchronization of an audio stream to an external clock

    Publication Year: 1999, Page(s):75 - 78
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    The phase vocoder is usually presented as a high-quality solution for time-scale modification of signals, Its main advantages versus the cheaper time-domain techniques include the high-quality of the output for a wide range of types of input signals (speech, music, noise), and the possibility to perform very large factor modifications (e.g., four-fold time-stretching or more). In this paper, we pr... View full abstract»

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  • An alternative implementation of the superdirective beamformer

    Publication Year: 1999, Page(s):7 - 10
    Cited by:  Papers (13)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    We introduce a new implementation of superdirective beamformers. The new structure has the advantage of reduced computational complexity. This advantage is due to a GSC-like (generalized sidelobe canceller) scheme. Unlike the conventional GSC, the filters in the sidelobe cancelling path are fixed and can be computed in advance by using the Wiener solution. The new structure yields exactly the same... View full abstract»

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  • Bayesian restoration of quantised audio signals using a sinusoidal model with autoregressive residuals

    Publication Year: 1999, Page(s):159 - 162
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    In digital audio systems, the amplitude of the signal is quantised with finite resolution. This is a nonlinear process which introduces distortion. We develop a Bayesian, model-based approach to reducing quantisation distortion when moving an audio signal to a higher resolution medium. The signal is modelled as a sum of sinusoids and an autoregressive (AR) process of unknown order. Estimation is p... View full abstract»

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  • Uniform spreading of amplitude panned virtual sources

    Publication Year: 1999, Page(s):187 - 190
    Cited by:  Papers (10)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The perceived spatial spread of amplitude panned virtual sources is dependent on the number of loudspeakers that are used to produce them. When pair-wise or triplet-wise panning is applied, the number of active loudspeakers varies as a function of the panning direction. This may cause unwanted changes in spatial spread and coloration of a virtual source if it is moved in the sound stage. In this p... View full abstract»

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  • On the optimality of subband adaptive filters

    Publication Year: 1999, Page(s):59 - 62
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    In this paper, we derive a polyphase analysis to determine the optimum filters in a subband adaptive filter (SAF) system. The structure of this optimum solution deviates from the standard SAF approach and presents its best possible solution only as an approximation. Besides this new insight into SAF error sources, the discussed analysis allows to calculate the optimum subband responses and the sta... View full abstract»

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  • Noise reduction in audio signals based on the perceptual coding approach

    Publication Year: 1999, Page(s):147 - 150
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    A new concept for the reduction of noise affecting audio signals transmitted in telecommunication channels is proposed. This concept is exploiting some features of the human auditory system. A strong subjective effect of noise suppression in noisy audio can be obtained by uplifting the masking thresholds above the estimated level of the noisy components or by reducing this level in such a way that... View full abstract»

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  • Studies of a wideband stereophonic acoustic echo canceler

    Publication Year: 1999, Page(s):207 - 210
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    In this paper a wideband stereophonic acoustic echo canceler is presented. The fundamental difficulty of stereophonic acoustic echo cancellation (SAEC) is described and an echo canceler based on a fast recursive least squares algorithm in a subband structure is proposed. This structure have been used in a real-time implementation, on which experiments have been performed. In the paper, simulation ... View full abstract»

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  • Considering non-stationarity for blind signal separation

    Publication Year: 1999, Page(s):111 - 114
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    We investigate the exploitation of non-stationarity for signal separation. A second-order decorrelation method is used to separate synthetic independent autoregressive signals that are made up of stationary blocks that have been convolutively mixed. We compare results obtained by not taking into account the non-stationarity with those that do. Under certain conditions, exploiting non-stationarity ... View full abstract»

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  • Immersion and content-a framework for audio research

    Publication Year: 1999, Page(s):71 - 74
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    Audio technology is rapidly expanding to various directions. In addition to recording, transmission, storage, and reproduction of sounds it supports practically unlimited modification and generation of sounds and their properties. It is possible to create ever more immersive virtual soundscapes. Audio-related information is also considered not only as signals or data anymore: sound can be analyzed... View full abstract»

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  • Interpolating head related transfer functions in the median plane

    Publication Year: 1999, Page(s):167 - 170
    Cited by:  Papers (14)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    This paper describes the interpolation of head related transfer functions (HRTFs) for all direction in the median plane. The interpolation of HRTFs enables us to reduce the number of measurements for new user's HRTFs, and also reduce the data of HRTFs in auditory virtual systems. In this paper, a simple linear interpolation method and the spline interpolation method are evaluated and advantages of... View full abstract»

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  • Toward physically-informed parametric synthesis of sound effects

    Publication Year: 1999, Page(s):1 - 5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    This paper presents motivations and methods for expressive parametric synthesis of real-world sounds. Prior research on musical instrument modeling is used and extended to sound-producing objects which are not specifically designed as musical instruments. Human/object interactions (gestures) and physical sound production mechanisms form the bases for determining suitable synthesis models for vario... View full abstract»

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  • Analysis of ill-conditioning of multi-channel deconvolution problems

    Publication Year: 1999, Page(s):155 - 158
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    Deconvolution of single- and multichannel systems is often an ill-conditioned problem whose exact solution boosts certain frequency bands excessively. Frequency-dependent regularisation can used to prevent this by attenuating sharp peaks in the magnitude response of the optimal filters. A z-domain analysis demonstrates that frequency-dependent regularisation works by pushing the poles of an ideal ... View full abstract»

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  • Reduced-rank modeling of head-related impulse responses using subset selection

    Publication Year: 1999, Page(s):175 - 178
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    This paper describes the subset selection method of modeling head-related impulse responses. The subset method is mathematical technique for choosing a set of basis functions directly from the data set that is being modeled. The subset method is compared to principal component analysis and the virtual speaker method View full abstract»

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  • Measurement and modeling techniques for directional sound radiation from the mouth

    Publication Year: 1999, Page(s):183 - 186
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    In this paper, modeling and measuring the directivity characteristics of human speakers are investigated. Using modern digital audio signal processing techniques, it is possible to simulate human speakers interactively in a virtual acoustical environment. This raises the question of finding appropriate data for the directional radiation characteristics of the mouth and the human head. In this pape... View full abstract»

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  • Frequency warping in the design and implementation of fixed-point audio equalizers

    Publication Year: 1999, Page(s):55 - 58
    Cited by:  Papers (5)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    This paper discusses the use of frequency warping for designing and implementing a class of discrete-time filters. This technique is particularly useful for audio filters because specifications are often given on a logarithmic frequency scale. It is shown that frequency warping allows a class of recursive filters to be designed using standard FIR techniques, and naturally leads to a structure for ... View full abstract»

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  • Structured encoding of the singing voice using prior knowledge of the musical score

    Publication Year: 1999, Page(s):47 - 50
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The human voice is the most difficult musical instrument to simulate convincingly. Yet a great deal of progress has been made in voice coding, the parameterization and re-synthesis of a source signal according to an assumed voice model. Source-filter models of the human voice, particularly linear predictive coding (LPC), are the basis of most low bit rate (speech) coding techniques in use today. T... View full abstract»

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  • A systematic hybrid analog/digital audio coder

    Publication Year: 1999, Page(s):35 - 38
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    This paper describes a signal coding solution for a hybrid channel that is the composition of two channels: a noisy analog channel through which a signal source is sent unprocessed and a secondary rate-constrained digital channel. The source is processed prior to transmission through the digital channel. Signal coding solutions for this hybrid channel are clearly applicable to the in-band on-chann... View full abstract»

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  • SVD-based optimal filtering with applications to noise reduction in speech signals

    Publication Year: 1999, Page(s):143 - 146
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    A class of SVD-based signal enhancement procedures is described, which amount to a specific optimal filtering technique for the case where the so-called `desired response' signal cannot be observed. It is shown that this optimal filter can be written as a function of the generalized singular vectors and singular values of a so-called speech and noise data matrix. A number of simple symmetry proper... View full abstract»

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  • Grid-based beamformer design for room-environment microphone arrays

    Publication Year: 1999, Page(s):23 - 26
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    A new method is presented for speech acquisition in a room-environment using a microphone array. The technique involves dividing the room into several regions (called grids), and classifying each grid according to the acoustic source located within it. Based on this classification, array weights are found to pass signals from the chosen source grid while minimizing the response to so-called interf... View full abstract»

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