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  • 1. Notes on how phase and delay distortions affect the quality of speech, music and sound effects

    Publication Year: 1964, Page(s):23 - 25
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (271 KB)

    Phase and delay distortions in the reproduction of speech and music have always been an important consideration in the design of high-quality systems. Early authoritative literature indicated this type of distortion could be disregarded. In 1935, events occurred in which phase delay in a two-way loudspeaker severely distorted sound effects. From this observation, a research program was set up to e... View full abstract»

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  • 2. Pitch perturbation detection

    Publication Year: 1965, Page(s):9 - 14
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    Pitch perturbations are defined as normally minute variations in the lengths of adjacent pitch periods of voiced speech. It has been shown that perturbations increase in size and number in the presence of laryngeal abnormalities such as cancerous growths. Previous studies have been limited by the unavailability of electronic equipment of sufficient accuracy to perform the pitch measurements in rea... View full abstract»

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  • 3. Push-pull class-AB transformerless power amplifiers

    Publication Year: 1963, Page(s):6 - 14
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (562 KB)

    One of the major problems in power-amplifier design is to combine high efficiency with thermal stability. Class-C operation with current drive is one possibility but distortion level is high due to crossover and nonlinearity of hFE. A new diode-compensation method is described which allows high efficiency Class-AB operation for maximum output and lowest distortion and with excellent the... View full abstract»

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  • 4. On the audibility of amplifier phase distortion

    Publication Year: 1965, Page(s): 99
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (110 KB)

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  • 5. Design of velocity-feedback transducer systems for stable low-frequency behavior

    Publication Year: 1963, Page(s):155 - 173
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1660 KB)

    Loudspeaker drive systems employing negative velocity feedback, by directly controlling the voice-coil motion, can improve the over-all linearity and largely suppress the fundamental resonance. These features permit good results using reasonably efficient loudspeakers in small sealed-box enclosures. In stable systems the degree of control provided is directly related to the loop gain. Instability ... View full abstract»

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  • 6. A special application of information theory to recording systems

    Publication Year: 1963, Page(s):3 - 6
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    Information theory concepts are applied to determine storage capacity and efficiency of recording media and techniques. Because the signal-to-noise ratio is a function of track width, the capacity must be calculated on an area basis. Expressions are derived for the storage capacity as a function of track width and number of levels stored. This provides a means for comparing the efficiency of vario... View full abstract»

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  • 7. Analytical design of magnetic loop induction systems

    Publication Year: 1965, Page(s):51 - 61
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (933 KB)

    The method of orthogonal fields, presented in the companion article, permits the design of a loop system with little spreading out of the resultant magnetic field. This article describes the mathematical basis of the design. Good approximation and ease of handling are obtained by the use of complex function theory and conformal mapping. Two solutions for the problem emerge, one based on the proper... View full abstract»

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  • 8. Measurement of loudspeaker characteristics

    Publication Year: 1965, Page(s): 65
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (110 KB)

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  • 9. Active low-pass filter design

    Publication Year: 1965, Page(s):104 - 111
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (675 KB)

    The characteristics of Bessel, Butterworth, and Chebyshev filters are briefly reviewed. The "Rauch" RC active low-pass filter configuration is described and design formulae are obtained. Tables of normalized capacitor values are provided for Bessel, Butterworth, and ±½ dB, ±1 dB, ±2 dB, and ±3 dB Chebyshev filters. Two examples indicate the use of the tables. View full abstract»

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  • 10. Two-channel power amplifier circuits of the parallel type

    Publication Year: 1964, Page(s):89 - 94
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (653 KB)

    A new power amplifier is described which amplifies both stereo signals by means of a single push-pull-like pair of transistors or tubes. This circuit is derived from the parallel-type push-pull amplifier and combines to advantage, especially its output-transformerless operation, with the possibility of controlling the stereo effect or producing an unlimited number of phantom stereo signals. All ba... View full abstract»

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  • 11. Audio problems in space

    Publication Year: 1965, Page(s):132 - 134
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (366 KB)

    Communication channel capacity is almost invariably at a premium between space vehicles and the earth. In the Apollo moon exploration program, plans call for the use of a special audio processing technique to enhance the signal-to-noise ratio. Extremely deep space probes such as the Mars Mariner IV now use very low bit rate transmissions because of signal-to-noise considerations: future manned pla... View full abstract»

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  • 12. Charge transfer process in electrostatic recording

    Publication Year: 1964, Page(s):63 - 66
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (429 KB)

    The physical mechanisms responsible for charge transfer between the electrodes and the dielectric tape material of a dc biased electrostatic recording system are discussed. The dominant mechanism for charge transfer is found to be spark discharge in the ambient air. On this basis, a serniquantitative description of the charging process is developed which is in good agreement with the experimental ... View full abstract»

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  • 13. Voice recording in space

    Publication Year: 1965, Page(s):141 - 145
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (748 KB)

    Manned space flight uses one of the oldest communications media, speech, and a voice recorder is required to store it. CBS Laboratories developed the voice-time recorders for the NASA Gemini missions, and flights have proved their effectiveness. The small, light, reliable device records the mixed voices of the astronauts on one track and a digital time signal on the other. Cartridges with one hour... View full abstract»

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  • 14. Considerations in high-fidelity moving-coil earphone design

    Publication Year: 1963, Page(s):188 - 194
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (727 KB)

    The theory of simple moving-coil earphone behavior is briefly described. Some considerations concerning the measurement of sound pressure response and harmonic distortion are mentioned, with special reference to difficulties encountered at high frequencies. Several design objectives are presented, followed by a discussion of design techniques including two new approaches: 1) the introduction of a ... View full abstract»

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  • 15. Conditions for optimum noise performance of transistor amplifiers with a reactive source

    Publication Year: 1965, Page(s):15 - 22
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (622 KB)

    When driven from a purely reactive source, conventional noise figure is undefined for a two-port network such as an audio amplifier. In order to assess the noise performance of small-signal amplifiers driven from reactive sources such as capacitor microphones, a signal-to-wideband-average-noise ratio is defined. It is shown that for transducers where output is related to internal reactance by a si... View full abstract»

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  • 16. Controlling the upper-frequency characteristics of velocity-feedback loudspeaker systems

    Publication Year: 1963, Page(s):174 - 182
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (868 KB)

    A treatment already given permits velocity-feedback systems to be designed for adequate stability margin at low frequencies. At the higher frequencies allowance must be made for the modifying effects of the relatively impure blocked voice-coil "inductance." Because of the nature of this inductance, a design procedure was developed in terms of closed-loop voltage response at the voice-coil terminal... View full abstract»

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  • 17. Thermal and power considerations in class B transistorized amplifiers

    Publication Year: 1965, Page(s):88 - 95
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (501 KB)

    Output power of a Class B transistorized amplifier, driving a complex load impedance, as limited by maximum junction temperature, is discussed. Peak instantaneous power dissipation and the maximum average power dissipation are studied as functions of power factor and drive level. The peak instantaneous power dissipation is investigated, in conjunction with thermal limitations, to derive a design c... View full abstract»

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Aims & Scope

This Transactions ceased production in 1965. The current retitled publication is IEEE Transactions on Signal Processing.

Full Aims & Scope