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Proceedings of IEEE Workshop on Applications of Signal Processing to Audio and Acoustics

17-20 Oct. 1993

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Displaying Results 1 - 25 of 44
  • Proceedings of IEEE Workshop on Applications of Signal Processing to Audio and Acoustics

    Publication Year: 1993
    Request permission for commercial reuse | PDF file iconPDF (43 KB)
    Freely Available from IEEE
  • Constraint based audio interpolators

    Publication Year: 1993, Page(s):161 - 164
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    In audio digital signal processing, interpolators are used for a variety of functions, including sample rate conversion. Linear interpolation is commonly used, but has serious signal quality problems for signals with significant high frequency content. Higher order interpolators based on sine functions or other conventional lowpass filter design techniques offer somewhat better performance, but ar... View full abstract»

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  • Generalized overlap-add sinusoidal modeling applied to quasi-harmonic tone synthesis

    Publication Year: 1993, Page(s):165 - 168
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    Analysis-by-synthesis/overlap-add (ABS/OLA) sinusoidal modeling has been successfully demonstrated as an accurate, flexible, and computationally tractable representation for the purposes of speech modification and harmonic tone synthesis; however, the model formulation used to synthesize these signals does not take full advantage of the structure of quasi-harmonic music signals. This paper describ... View full abstract»

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  • Real-time generation of interactive virtual auditory environments

    Publication Year: 1993, Page(s):106 - 109
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    Virtual auditory environments refer to a procedure in which auditory environments are created by means of a computer model (Lehnert & Blauert 1991). These artificial environments are perceived as being natural and they create the impression of being present in another physical space. The sense of tele-presence can greatly be improved by making these environments interactive, that is, the subje... View full abstract»

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  • HNM: a simple, efficient harmonic+noise model for speech

    Publication Year: 1993, Page(s):169 - 172
    Cited by:  Papers (11)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    HNM, a new analysis/modification/synthesis model based on a harmonic+noise representation of the speech signal is presented. The HNM model has several specificities: (1) HNM assumes the speech signal to be composed of a deterministic part and of a stochastic part, (2) the deterministic part is assumed to contain only harmonically related sinusoids with linearly varying complex amplitudes, and (3) ... View full abstract»

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  • Analog/digital hybrid VLSI signal processing using single BIT modulators

    Publication Year: 1993, Page(s):136 - 139
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    A hybrid analog/digital technique for efficient VLSI implementation of signal processing systems is presented. Single bit delta sigma modulators are used to modulate analog inputs into a form which can be considered simultaneously analog and digital, and directly manipulated as such. A cross-correlator is proposed, demonstrating the compactness of VLSI signal processing systems using this approach View full abstract»

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  • Computation of modulation spectra for the speech transmission index using real speech

    Publication Year: 1993, Page(s):110 - 113
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    While it has been suggested that the speech transmission index (STI) for on environment may be calculated using speech rather than test signals, computational artifacts distort the speech analyses whereas they have minimal impact on analyses with test signals. This report documents some of the difficulties encountered when using speech as the probe stimulus and proposes modifications in STI comput... View full abstract»

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  • A simplified source/filter model for percussive sounds

    Publication Year: 1993, Page(s):173 - 176
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    This paper deals with source-filter models of percussive instruments. A `multi-channel excitation/filter model' is presented in which a single excitation is used to generate several sounds, for example six piano tones belonging to the same octave. Techniques for estimating the model parameters are presented and applied to the sound of a real piano. Our experiments demonstrate that it is possible t... View full abstract»

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  • Current and future standardization of high-quality digital audio coding in MPEG

    Publication Year: 1993, Page(s):43 - 46
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    Since 1988 ISO/IEC JTCI/SC29 WG11 (MPEG) is working on the standardization of video and audio signals. The Audio subgroup of MPEG is working on bit rate reduction systems for high quality digital audio. Since the first phase of this standardization effort has been finished, MPEG/Audio is extending its work to multichannel audio coding systems as well as to medium quality coding at lower sampling f... View full abstract»

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  • Dithered quantizers with and without feedback

    Publication Year: 1993, Page(s):140 - 143
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    It is shown that quantizing systems without feedback respond to the use of particular spectrally-shaped dither signals quite differently from those with feedback paths. For each type of system, conditions are given which ensure that the quantization error will be wide-sense stationary with no input dependence and with a predictable power spectral density function View full abstract»

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  • Developments in transaural stereo

    Publication Year: 1993, Page(s):114 - 117
    Cited by:  Papers (27)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    Transaural stereo achieves precision 3-D imaging by compensating for spectral distortions in the loudspeaker-to-car signal paths. The heart of transaural stereo, signal processing for crosstalk cancellation, is herein generalized to accommodate any number of loudspeakers and listeners in any layout. Transaural equations are written and then solved using standard algebraic methods. Worked-out examp... View full abstract»

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  • Superdirective arrays for hearing aids

    Publication Year: 1993, Page(s):73 - 76
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    Microphone arrays are the most effective of the techniques that have been proposed for improving speech intelligibility in noise for the hearing impaired. Superdirective arrays are attractive since optimal performance can be obtained for a stationary random noise field. A constrained superdirective array suitable for hearing-aid applications is discussed in the paper View full abstract»

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  • Weaver SSB subband acoustic echo canceller [videoconferencing application]

    Publication Year: 1993, Page(s):8 - 11
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    A Weaver SSB subband structure is used to implement an acoustic echo canceller. The structure has 29 bands of 250 Hz width, covering the audio range from 0 to 7 kHz. The Weaver structure lowers each band pass region to baseband, allows for oversampling to eliminate aliasing components, and is computationally efficient. The subsampled components are purely real, as compared to the complex component... View full abstract»

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  • The restoration of pitch variation defects in gramophone recordings

    Publication Year: 1993, Page(s):148 - 151
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A new algorithm is presented for the identification and restoration of time-varying pitch defects in audio signals. The problem is commonly encountered as `wow' in gramophone disc and magnetic tape recordings where motor speed variations or eccentricity in the recording process are significant. The algorithm operates in two stages, the first of which trades tonal components in musical signals to g... View full abstract»

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  • Objective measures based on neural networks for hearing loss compensation techniques

    Publication Year: 1993, Page(s):93 - 96
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    An objective measures system has been developed to predict the results of subject-based tests for sensorineural hearing loss compensation techniques. Parameters related to the loudness level of the compensated speech signal are extracted from its frequency spectrum. These parameters are then used to train a neural network based phoneme classifier. Good prediction results have been achieved for two... View full abstract»

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  • A time-frequency neutral network layered model for hearing perception

    Publication Year: 1993, Page(s):123 - 126
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    This paper introduces a layered neural network model for hearing perception. It is based on five important perceptual properties of hearing. The neural network model processes a joint-domain representation of the input signal to yield the desired perceptual properties. The focus is on the first two layers of the model, the transformation layer and two feature extraction layers View full abstract»

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  • Adaptive predictive coding with transform domain quantization using block size adaptation and high-resolution spectral modeling

    Publication Year: 1993, Page(s):31 - 34
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The adaptive predictive coding with transform domain quantization (APC-TQ) technique was proposed by Bhaskar (1991) for the compression of audio signals. Since then, significant developments have taken place leading to a reduction in the coding rate. While enhancing the audio quality. These developments include (i) the use of block size adaptation to exploit the variations in the stationarity of t... View full abstract»

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  • Robust real-time constrained hearing aid arrays

    Publication Year: 1993, Page(s):81 - 84
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The paper addresses the implementation of a real-time, robust, adaptive spatial filter used as a preprocessor for a monaural hearing aid. The goal of the ongoing study is the development of a processor that provides the user spatial selectivity and an attenuation of undesired interfering sources, while robustly controlling the response to a desired source. A four microphone, real-time, robust proc... View full abstract»

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  • The 2-D digital waveguide mesh

    Publication Year: 1993, Page(s):177 - 180
    Cited by:  Papers (47)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    An extremely efficient method for modeling wave propagation in a membrane is provided by the multidimensional extension of the digital waveguide. The 2-D digital waveguide mesh is constructed out of bi-directional delay units and scattering junctions. We show that it coincides with the standard finite difference scheme in the lossless case. Wave propagation in the mesh is compared with wave propag... View full abstract»

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  • Noise reduction using an adaptive microphone array in a car-a speech recognition evaluation

    Publication Year: 1993, Page(s):16 - 18
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    This paper describes an evaluation of an adaptive microphone array with respect to speech recognition performance in a car. The microphone array is compared to two conventional microphones of different types. The speech recognition device is aimed to be a part of a man/machine-interface between the driver and car information services View full abstract»

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  • Aspects of current standardization activities for high-quality, low-rate multi-channel audio coding

    Publication Year: 1993, Page(s):47 - 50
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    This paper analyzes directions in the current standardization activities for multi-channel audio, briefly reviews the composite coding schemes AC-3 and ISO 11172-3 compatible systems, and discusses requirements, features, and time-tables for the audio systems in the ISO/Moving pictures Expert Group (MPEG) phase 2 and the United States high definition television (HDTV) standardization processes View full abstract»

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  • Hierarchic models of hearing for sound separation and reconstruction

    Publication Year: 1993, Page(s):157 - 160
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    In building a machine to detect and segregate individual components in sound mixtures, the best example to copy is the human auditory system. Several models of auditory organization implement various rules of psychoacoustic grouping. We propose in addition to model auditory inference as exhibited in the well-known `phonemic restoration illusion' of Warren (1970). A hierarchy of abstracted features... View full abstract»

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  • Perceptual consequences of interpolating head-related transfer functions during spatial synthesis

    Publication Year: 1993, Page(s):102 - 105
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    In implementing a spatial auditory display, many engineering compromises must be made to achieve a practical system. One such compromise involves devising methods for interpolating between the head-related transfer functions (HRTFs) used to synthesize spatial stimuli in order to achieve smooth motion trajectories and locations at finer resolutions than the empirical data. The perceptual consequenc... View full abstract»

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  • Autocorrelation method for high-quality time/pitch-scaling

    Publication Year: 1993, Page(s):131 - 134
    Cited by:  Papers (8)  |  Patents (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    A new method is described for high-quality time or pitch modifications of audio signals. The method is a simple but efficient improvement of the splice method. Thanks to its simplicity, the algorithm can be implemented to run in real-time on standard microprocessors. Informal listening tests have demonstrated the method's capability to modify high-quality audio signals without introducing audible ... View full abstract»

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  • Improving joint stereo audio coding by adaptive inter-channel prediction

    Publication Year: 1993, Page(s):39 - 42
    Cited by:  Papers (8)  |  Patents (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A method for exploiting inter-channel redundancies of stereophonic or multichannel audio signals is presented. In contrast to known stereo redundancy reduction techniques used in joint stereo audio coding. Where only the statistical dependencies between two concurrent samples of the left and right channel signals are considered, the adaptive inter-channel prediction also takes into account possibl... View full abstract»

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