A new common battery telephone set has been developed and is now in production which is materially better than previous types in performance and convenience to the user. This paper describes this set, and discusses, as typical of Bell System dleveoprnent processes, the contributions of the operating, development, and manufacturing organizations to the final design. It also describes the evaluation of the design by the controlled service trial, in terms of the results produced in actual service in the hands of the public.
An artificial voice and ear have been developed which are sufficiently close simulations of the real voice and ear in their principal physical attributes to justify their use in both shop and laboratory tests of telephone transmitters and receivers.
The artificial voice and ear have certain advantages in that they can be exactly specified and reproduced and can be used in determining physical characteristics of instruments which are difficult or impossible to obtain with real voices and ears.
The new telephone instruments now being introduced by the Bell System result in an outstanding improvement in transmission performance in service. The evidence for this, as obtained by comprehensive laboratory and field tests, is presented here together with a discussion of the factors responsible for this superior performance and of the consideration involved in its appraisal.
A number of factors contribute to the difficulties involved in the design of a telephone handset which gives as good service performance as a desk‐stand. The handset transmitter, for example, not only is used in a wider range of positions but also is moved much more frequently, so that wider variations are experienced in its characteristics.
Further difficulties are introduced by the close physical connection of the receiver and transmitter, in that “howling” tends to be set up.
The handset has been developed so that it overcomes all these difficulties and is interchangeable with the deskstand in existing telephone plant without important reaction on either transmission or signaling performance.
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