منابع مشابه
The Invention of the Telephone
This case study analyzes the invention of the telephone by Alexan-der Graham Bell. But to understand this act of creative design, we have to analyze Bell's earlier research goals. We abstract Bell's research method and the reasoning mechanisms he used that appear time and again in long-term creative problem solving and design. 1 Case Study This case study analyzes some important reasoning steps...
متن کاملSpeaker verification over the telephone
The aim of the research reported in this paper was to assess the capability of state-of-the-art methods for speaker verification in order to determine if high enough performance levels could be obtained to support the development of telecom applications. This experimental study quantified speaker recognition performance out of the context of any specific application, as a function of factors mo...
متن کاملRe-engineering the Telephone System
The evolution of the Internet offers the opportunity to redesign how basic communication services are provided. All services, including (multimedia) telephony, radio and television, can be based on a common, packet-switched, connectionless infrastructure of the Internet. Intelligence is placed into end systems for scalability and controllability. This paper discusses the protocols and technolog...
متن کاملThe G.P.O. telephone answering set.
Maintaining a "watch" on the telephone is always a problem in a doctor's household, and particularly for half-days and similar offduty periods. Doctors in the larger towns have facilities for interception and transfer of incoming calls which can be used on request to the operator. They also have call services and message taking bureaux available. Partnerships in the smaller towns are often able...
متن کاملBeware of the ‘telephone effect’: the influence of telephone transmission on the measurement of formant frequencies
Speech scientists often have to work with speech signals that have been transmitted over the telephone. Although the acoustic properties of telephone transmission such as the band-pass filter characteristics are well known, little attention has been paid to their effect on the measurement of speech parameters. This study deals with artefacts introduced by the lower cut-off slope of the transmis...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1878
ISSN: 0036-8733
DOI: 10.1038/scientificamerican09141878-170