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IEEE Transactions on Audio and Electroacoustics

Issue 3 • Date September 1970

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Displaying Results 1 - 19 of 19
  • [Front cover and table of contents]

    Publication Year: 1970, Page(s): 0
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    Freely Available from IEEE
  • Editorial

    Publication Year: 1970, Page(s): 233
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    Freely Available from IEEE
  • "Soft limiting" in audio power amplification

    Publication Year: 1970, Page(s): 313
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (97 KB)

    A method of instantaneous automatic compression of large signals, called "soft limiting", generates much less harmonic distortion than uncontrolled clipping. If the audible effect of finite-power output (clipping) is prevented, the effect should be the illusion of greater power reserve while reducing manufacturing costs. View full abstract»

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  • Correction to "On the derivation of fast Fourier transform"

    Publication Year: 1970, Page(s):319 - 320
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (146 KB)

    First Page of the Article
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  • Correction to "Estimation of the coherence spectrum and its confidence interval using the fast Fourier transform"

    Publication Year: 1970, Page(s): 320
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (58 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1970, Page(s): c4
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    Freely Available from IEEE
  • Optical and numerical reconstruction of images from sound-wave holograms

    Publication Year: 1970, Page(s):258 - 267
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1368 KB)

    Sound-wave holograms are constructed with sound waves of 10 kHz to 20 kHz by two holographic techniques; the coherent background and the electronic reference methods. The acoustical fields, which are scanned by a microphone and displayed by a lamp, are recorded on films as sound-wave holograms. In the process of reconstructing images from sound-wave holograms, optical and numerical reconstructions... View full abstract»

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  • The standardization of monaural phase

    Publication Year: 1970, Page(s):288 - 299
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1560 KB)

    This paper redefines and examines the problem of monaural phase distortion in audio systems. Both technical and psychoacoustical aspects of the problem are considered. The redefinition of phase distortion is based upon adopting the acoustical signal at the input of the system as the standard reference. The sources of phase distortion in audio systems are examined with reference to this standard. A... View full abstract»

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  • Spectral estimation for transient waveforms

    Publication Year: 1970, Page(s):248 - 257
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1176 KB)

    For steady-state waveform analysis, the classical (possibly smoothed) periodogram of the sampled waveform gives one an adequate spectral representation. For transient waveforms of unknown duration in noise, however, the periodogram generally fails in that it is tied to a fixed time interval. As an alternative, a digital computer program which will do time-varying spectral estimation has been devel... View full abstract»

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  • Filters for formant synthesizers

    Publication Year: 1970, Page(s):300 - 303
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    A formant circuit for a speech synthesizer with analog and digital command systems ensuring very good stability and signal-to-noise ratio is described. View full abstract»

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  • Equal loudness contour circuit using an operational amplifier

    Publication Year: 1970, Page(s):313 - 315
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Without contour compensation, music sources appear to have lower bass and treble response at lower volume levels. This occurs because our ears are less sensitive to the extreme frequencies at low-sound levels (Fletcher-Munson effect). This correspondence describes a circuit that compensates for this effect and is compatible with today's integrated circuit amplifier designs. View full abstract»

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  • The digital computation of discrete spectra using the fast Fourier transform

    Publication Year: 1970, Page(s):271 - 287
    Cited by:  Papers (17)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1320 KB)

    This paper is devoted to a discussion of discrete spectrum analysis which is important in applicational areas such as sonar and replica correlation. The discrete Fourier transform is shown to arise naturally as a consequence of finite impulsive sampling and the fast Fourier transform is introduced as the most efficient means of computing the discrete Fourier transform. These are described in terms... View full abstract»

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  • More about the structure of speech signal and the principles of its analysis

    Publication Year: 1970, Page(s):316 - 317
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The speech signal is examined as part of a specific speech communication system. The results of such examination yield the following principles of this analysis. 1) The speech signal must be simultaneously and separately processed for each type of modulation. 2) The different forms of information must be extracted from the result of each detection process, and then combined. View full abstract»

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  • Quantizer levels for speech differential PCM systems

    Publication Year: 1970, Page(s):315 - 316
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A 3-bit differential pulse-code modulation (PCM) system designed for speech was simulated on a computer to determine the quantizer levels which minimize the quantizing noise. View full abstract»

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  • Word recognition by means of orthogonal functions

    Publication Year: 1970, Page(s):304 - 312
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    This paper describes experiments in which word recognition is based on comparing the projections of input words on an orthogonal basis with those of a stored library of words. An initial orthogonal basis is determined from the generalized spectrum of short time segments selected from a vocabulary of ten words. The initial basis is optimized by minimizing the complementary error energy. By projecti... View full abstract»

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  • Calculation of vocal tract length

    Publication Year: 1970, Page(s):268 - 270
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    There are many different vocal tract shapes which could produce the same speech signal. One of the parameters of the vocal tract which is not directly available from the speech signal is the length of the tract. A hypothesis is proposed for determining the vocal tract length from a specification of the impedance seen at the lips. Vowel data of Fant [3] are used to test the hypothesis. There is ver... View full abstract»

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  • Perception of slope-overload distortion in delta-modulated speech signals

    Publication Year: 1970, Page(s):240 - 247
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    An experiment was performed in which controlled amounts of slope-overload distortion were produced in specified sections of a test sentence. Preliminary trials showed that the commonly used measure "percent of time of slope overload" is not a good indicator of perceptual distortion in delta-modulated speech signals. A more appropriate parameter for specifying slope-overload distortion is the rms s... View full abstract»

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  • Transient distortion in transistorized audio power amplifiers

    Publication Year: 1970, Page(s):234 - 239
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    This paper discusses a new kind of distortion mechanism found in transistorized audio power amplifiers. It is shown that this distortion arises from the multistage feedback loop found in most high-quality amplifiers, provided that the open-loop transient response of the power amplifier is slower than the transient response of the preamplifier. The results of the analysis are verified by measuremen... View full abstract»

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  • Synthesis of multibandpass numerical filters

    Publication Year: 1970, Page(s):317 - 319
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The problem of low-pass to multibandpass transformation of numerical filters is considered. Properties of frequency transformations are studied and, based on these, a general design procedure is outlined which may be used for obtaining filters with any number of passbands. The procedure is illustrated by means of a ten passband example. A canonic form for realizing bandpass filters is also discuss... View full abstract»

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Aims & Scope

This Transactions ceased production in 1973. The current retitled publication is IEEE Transactions on Signal Processing.

Full Aims & Scope