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Audio, IRE Transactions on

Issue 6 • Date November-December 1958

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Displaying Results 1 - 9 of 9
  • [Front cover and tabel of contents]

    Page(s): 0
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  • Announcements

    Page(s): 117 - 120
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  • Chapter news

    Page(s): 117
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  • Minutes of the fall administrative committee meeting

    Page(s): 117
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  • An improved method for the measurement of nonlinear audio distortion

    Page(s): 121 - 130
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    The three most common methods of measuring non-linear distortion in audio equipment are the harmonic method in which harmonics of a single sinusoidal input signal are measured; the SMPTE, or modulation, method in which the modulation of a high audio frequency by a low frequency is measured; and the CCIF, or difference frequency, method in which the beat note between two closely spaced frequencies is measured. These methods are discussed with particular reference to the behavior which may be expected in applications where the equipment under test includes pre-emphasis or de-emphasis networks, or where the distortion is symmetrical. It is shown that in a number of cases a more satisfactory method for use at the higher audio frequencies would be the measurement of the third-order component, rather than the second, produced in the CCIF method. A modification of the CCIF method using a sharp-cutoff low-pass filter is described which is capable of measuring both second- and third-order components, it is then shown that an instrument for this new method and the standard SMPTE method have many elements in common and that one instrument could be devised to make both forms of tests. The discussion is illustrated with the results of measurements made on a simulated distortion generator and on actual samples of audio equipment. View full abstract»

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  • Modulation noise in two-channel disk recordings

    Page(s): 130 - 131
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    Part of a modulation-noise problem encountered in two-channel stereo disk recording is shown to have its source not in the recording channel but in the geometry of the record-playback system. A relation is given to show the order of magnitude of this effect and some of the possible means of improvement are indicated. View full abstract»

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  • Electromagnetic efficiency of heads in magnetic recording

    Page(s): 131 - 132
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    A simple method is described for obtaining a figure of merit for response of magnetic recorder due to core losses and electrical characteristics. View full abstract»

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  • Contributors and back cover

    Page(s): c4
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Aims & Scope

This Transactions ceased production in 1962. The current retitled publication is IEEE Transactions on Signal Processing.

Full Aims & Scope