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Audio, IRE Transactions on

Issue 6 • Date November-December 1960

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Displaying Results 1 - 12 of 12
  • [Front cover and tabel of contents]

    Publication Year: 1960 , Page(s): 0
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    Freely Available from IEEE
  • The editor's corner

    Publication Year: 1960 , Page(s): 189
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  • National officers of the PGA, 1960-1961

    Publication Year: 1960 , Page(s): 190 - 192
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  • PGA awards for 1959

    Publication Year: 1960 , Page(s): 193 - 194
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  • Transistor power amplifier with negative output impedence

    Publication Year: 1960 , Page(s): 195 - 201
    Cited by:  Papers (1)  |  Patents (1)
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    The response of electromechanical transducers can often be greatly improved by proper electrical termination that compensates for their coil impedance. The results of a detailed analysis are presented for two practical transistor amplifier configurations which produce negative output impedance. A push-pull power amplifier, based on this analysis, uses the bias stabilizing elements of the output stage to obtain the necessary positive current feedback. The three-stage circuit delivers, without a transformer, 12 watts into 8 ohms or 8 watts into 16 ohms. The output impedance is adjustable from plus 1 ohm to either minus 7 or minus 14 ohms. This amplifier has been used successfully in an all-transistor stereophonic high-fidelity system. View full abstract»

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  • A transistor push-pull amplifier without transformer

    Publication Year: 1960 , Page(s): 202 - 205
    Cited by:  Papers (1)
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    A push-pull transistor amplifier has been developed using a matched pair in the output stage, with a minimum number of components and requiring no transformers. View full abstract»

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  • Automatic spectral compensation of an audio system operating with a random noise input

    Publication Year: 1960 , Page(s): 206 - 218
    Cited by:  Papers (1)
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    A set of 80 filters is used to divide a random noise input spectrum of an audio system into 25 cps increments. An identical set operating as a spectrum analyzer provides a similar function on the system output. By means of an automatic regulating system using solid-state electronics, each of the 80 loops is closed independently, thus providing a unique control system compensating the audio system spectrum and equalizing disturbing resonance phenomena. This method has been successfully applied to the control of a vibration system spectrum where mechanical resonances at the exciter table produce high Q peaks and notches. The degree of spectral flatness reveals that adequate compensation is possible for typical resonance phenomena occurring over a wide frequency range. View full abstract»

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  • A new cardioid-line microphone

    Publication Year: 1960 , Page(s): 219 - 220
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    A new microphone, the Electro-Voice Model 642, is described. Designed particularly for television and motion picture applications where the usable microphone working distance must be a maximum, the model 642 has improved directivity and high sensitivity. The improved directivity is achieved by functioning as a first-order gradient microphone at bass frequencies and as a line microphone at higher frequencies. A detailed description of the directional characteristics is included. View full abstract»

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  • Choice of base signals in speech signal analysis

    Publication Year: 1960 , Page(s): 221 - 229
    Cited by:  Papers (8)
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    Fourier series is generally considered to be one of the most basic mathematical tools of the communications engineers; when experimental support is sought for the theoretical conclusions obtained, it has the advantage of having readily available source equipment in the form of sine-wave generators. In many cases, however, due to the characteristics of the signals under study, the analysis into other base functions would result in a reduction of expression complexity and a better insight into the problem. This is demonstrated on a specific example, in which the damped-oscillatory voiced speech sounds are expressed by means of complex-exponential base functions. The method of measuring the pertinent coefficients is given; the nature of the analyzing equipment, which is also used for synthesis, is described briefly, and experimental results, including synthetically obtained approximations of the original signals, are presented. While speech signals are used to illustrate the method, the latter is applicable to other signals as well. View full abstract»

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  • The use of pole-zero concepts in loud-speaker feedback compensation

    Publication Year: 1960 , Page(s): 229 - 234
    Cited by:  Papers (2)  |  Patents (1)
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    Pole-zero concepts, with the associated techniques of signal flow graphs and root locus plots, are introduced and used in the analysis and synthesis of integrated loudspeaker-amplifier systems in the lower-frequency region. The case of the infinite baffle system is treated in detail, and formulas are developed for general voltage and current feedback. This is then simplified into a design method using only RC elements, and the compensation of the high-efficiency woofer in an undersized enclosure illustrates the method. View full abstract»

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  • Amplitude limitations in nonlinear distortion correction

    Publication Year: 1960 , Page(s): 235
    Cited by:  Papers (2)
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    First Page of the Article
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  • [Back cover]

    Publication Year: 1960 , Page(s): c4
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    Freely Available from IEEE

Aims & Scope

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

Full Aims & Scope