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Audio, Transactions of the IRE Professional Group on

Popular Articles (March 2015)

Includes the top 50 most frequently downloaded documents for this publication according to the most recent monthly usage statistics.
  • 1. A practical binaural recording system

    Publication Year: 1953 , Page(s): 14 - 22
    Cited by:  Papers (2)
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    A practical. binaural recording unit was designed and manufactured t o extend the present day high quality sound recording-reproducing equipment development So as t o u t i l i z e some of the benefits inherent in a stereophonic system. A review of theoretical factors involved in binaural sound recording and reproduction is presented, with a description of t h e t e c h n i c a l equipment developed t o provide a high quality binaural system consistent with reasonable 0;verd.l equipment cost. Some novel problems and effects encountered i n the development program, as well as experiences with binaural recording techinques i n t h e f i e l d s of radio transmission, court room recording, and test instrtmentation, are described. View full abstract»

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  • 2. An acoustic lens as a directional microphone

    Publication Year: 1954 , Page(s): 5 - 7
    Cited by:  Papers (1)
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    An acoustic lens combined with a conical horn can be used to obtain a highly directional microphone without some of the disadvantages of the parabolic microphone. The directional characteristics can be calculated satisfactorily if one assumes that the horn provides uniform flooding of the lens aperture. View full abstract»

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  • 3. Method for time of frequency compression-expansion of speech

    Publication Year: 1954 , Page(s): 7 - 12
    Cited by:  Papers (17)  |  Patents (2)
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  • 4. Components and mechanical considerations for magnetic sound on 35mm film

    Publication Year: 1954 , Page(s): 86 - 94
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    The art of sound recording in the motion picture field had reached a high professional status before magnetic recording began to receive consideration bythe radio and television industries. This articIe reviews this status and discusses the relative merits of 35-mm sprocket-hole film and inch tape with respect to the requirements of the motion picture industry. The article traces the applications of the magnetic recording medium to single-track, multi-track and stereophonic recording, including composite magnetic sound and picture film. The discussion includes a description of the associated apparatus and i t s conformity to the established practices of the industry. View full abstract»

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  • 5. Analysis of a single-ended push-pull audio amplifier

    Publication Year: 1953 , Page(s): 9 - 19
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    This paper deals with a t h e o r e t i c a l c i r c u i t analysis of a single-ended push-pull audio amplifier. Linear tube characteristics and small signals are assumed. The problem of impedance matching is first discussed. The properties and the requirements of a s a t i s f a c t o r y d r i v e r s t a g e are analyzed, and an output stage using an impedance matching output transformer is discussed. The effects of the plate-to-ground capacitance of t h e d r i v e r stage on the frequency-gain characteristic and of the choice of the tube and circuit parameters are analyzed. The paper concludes with some experimental results indicative of the inherent properties of the amplifier. In a r e c e n t a r t i c l e by Peterson and Sinclair,l special c i r c u i t s have been suggested by which a high fidelity, low d i s t o r t i o n audio amplifier can be constructed without using output transformers or i n which the requimrnents of an output transformer can be greatly simplified, The present a r t i c l e will give a t h e o r e t i c a l analysis of the b a s i c c i r c u i t used by Peterson and Sinclair. It will be observed that many desirable characte r i s t i c s of t h i s a m p l i f i e r c i r c u i t can be deduced from this analysis. View full abstract»

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  • 6. Why fight grid current in class B modulators?

    Publication Year: 1953 , Page(s): 26 - 32
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    Grid voltage waveform d i s t o r t i o n r a n k s w i t h o u t p u t transformer inadequacies among Class B audio amplifiers deficiencies. This article d e a l s w i t h t h e problem of grid voltage waveform distortionand suggests the use of low p l a t e r e s i s t a n c e low mu triode tubes as a solution. By avoiding operating conditions which r e s u l t i n grid current, the major source of distortion i s eliminated. Direct coupled d r i v i n g c i r c u i t s which encourage large amounts of inverse feedback a r e r e a d i l y employed under such conditions. A typical amplifier and its measured characteristics i s used f o r i l l u s t r a t i o n . View full abstract»

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  • 7. Stereophonic recording equipment

    Publication Year: 1953 , Page(s): 13 - 15
    Cited by:  Papers (1)
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    The normal individual has no more than two ears (unfortunately, sometimes only one, putting him at a stereophonic disadvantage), and so it w a s at first erroneously believed that only two channels need be used for stereophonic reproduction. Earphone listening, binaurally, has certain deficiencies, except for certain subjective listening studies. Loud-speaker reproduction reaches more people at a given time, and corrects some of the deficiencies of listening through earphones. However, room acoustics problems, not present when earphones are used, enter here. An optimum minimum of three channels for loudspeaker listening h a s been established by comparative listening tests. Electrical phasing, time phasing, and balanced loudness between channels are necessary for the maximum realization of the benefits of a stereophonic system. Minimum harmonic and intermodulation distortion obviously aids any system. Transmitted band width has an effect on realism also. View full abstract»

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  • 8. Room acoustics

    Publication Year: 1953 , Page(s): 4 - 12
    Cited by:  Papers (1)
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  • 9. The cascode as a low noise audio amplifier

    Publication Year: 1954 , Page(s): 60 - 64
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  • 10. A note on noise in audio amplifiers

    Publication Year: 1954 , Page(s): 39 - 42
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  • 11. Dynamic amplifiers for phonographic reproduction

    Publication Year: 1954 , Page(s): 80 - 85
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    In dynamic amplifiers for phonographs, the gain versus frequency characteristics change in accordance with the varying nature of the impressed audio signal. This paper outlines the basic principles of design of such amplifiers for expansion and for background noise reduction purposes. Especial reference is made to the fundamental patent literature in this field. View full abstract»

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  • 12. Subjective loudspeaker testing

    Publication Year: 1953 , Page(s): 7 - 9
    Cited by:  Papers (1)
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  • 13. Air-core coil design for crossover networks

    Publication Year: 1953 , Page(s): 9 - 11
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Aims & Scope

This Transactions ceased production in 1955. The current retitled publication is IEEE Transactions on Signal Processing.

Full Aims & Scope