Journal ArticleDOI
Radiotelephone Noise Reduction by Voice Control at Receiver
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TLDR
In this article, the effect of the noise interference with the speech transmission is reduced by eliminating the high peaks of noise of very short duration and depending upon the persistence of sensation of speech in the ear to bridge the gaps.Abstract:
IN TRANSMITTING speech over radiotelephone circuits there are a number of conventional methods of increasing the signal with respect to the noise. Examples of such methods are the use of higher power, directive antennas, diversity reception, and filters to narrow the received frequency band. In addition, there are other methods of a special character which reduce the effect of the noise interference with the speech transmission. One example of such a device limits the noise interference by eliminating the high peaks of noise of very short duration and depending upon the persistence of sensation of speech in the ear to bridge the gaps. Another method diminishes the noise in intervals of no speech. This is the method which will be discussed here.read more
Citations
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Journal ArticleDOI
Devices for controlling amplitude characteristics of telephonic signals
TL;DR: A family of devices which automatically respond to signals and control the circuit amplification in such a way as to improve transmission is described.
Journal ArticleDOI
Experimental Radio-Telephone Service for Train Passengers
TL;DR: In this article, a typical train installation operating through a highway channel is described, where a coin box is used on the train for radio-telephone service, and the arrangements for this purpose are also described.
Journal Article
The Vodas
TL;DR: The connection of ordinary telephone systems by means of long radiotelephone links presents some unique and interesting technical problems that require voice-operated switching devices to suppress echoes and singing.
Journal ArticleDOI
Technical Aspects of Experimental Public Telephone Service on Railroad Trains
N. Monk,S.B. Wright +1 more
TL;DR: In this paper, the authors describe component parts of the train telephone system, results of radio coverage tests on the routes involved, and devices employed to control two-way transmission, and some results of the experimental operation are pointed out.
References
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Journal ArticleDOI
A New High Efficiency Power Amplifier for Modulated Waves
TL;DR: In this paper, a new form of linear power amplifier for modulated radio-frequency waves was introduced, which achieved a plate circuit efficiencies of sixty to sixty-five per cent independent of modulation.
Journal ArticleDOI
Resonant Lines in Radio Circuits
TL;DR: In this paper, the mathematical relations governing their operation and several applications are discussed, including the use of the lines as circuit elements in the ultra-short wave range as a means of obtaining high impedance with low loss, where the lines may be either concentric tubes or 2 wires, and are sufficiently small that they may be placed within the apparatus.
Journal ArticleDOI
Transmission Lines for Short-Wave Radio Systems
E. J. Sterba,C. B. Feldman +1 more
TL;DR: In this paper, the requirements imposed on transmission lines by short-wave radio systems are discussed, and the difference in the requirements for transmitting and receiving purposes for both transmitting and reception purposes is emphasized.
Journal ArticleDOI
Transoceanic telephone service — Short-wave equipment
TL;DR: From the radio point of view the important technical features and developments incorporated in the new transmitting and receiving stations of the American Telephone and Telegraph Company located respectively at Lawrenceville and Netcong, New Jersey are described.
Journal ArticleDOI
Radiation Resistance of Concentric Conductor Transmission Lines
TL;DR: In this article, an expression for the radiation resistance of a cylinder is derived, following the "tangential field" or "induced electromotive force" method as adapted by Pistolkors.