Showing papers on "Telephony published in 1975"
TL;DR: It is suggested that a per-channel voice coder should be realizable in a single MOS chip and the decoder is similar to the coder.
Abstract: Monolithic arrays of binary-weighted MOS capacitors may be used in nonlinear as well as linear A/D and D/A converters A proposed design for a standard 15-segment approximation to the /spl mu/255 law coder for pulse-code modulation (PCM) telephony is presented here Analysis and simulation suggest that a per-channel voice coder should be realizable in a single MOS chip The decoder is similar to the coder
15 citations
01 Jan 1975
5 citations
TL;DR: An integrated distribution system is proposed that provides switched video, data, and telephony on a single analog broadband facility, using the concept of demand assignment, and it is expected that telephony will be added economically to this reduced capability system, as digital switching of telephony becomes practical.
Abstract: An integrated distribution system is proposed that provides switched video, data, and telephony on a single analog broadband facility, using the concept of demand assignment. A reduced capability broad-band distribution system, based on the same principles and using coaxial cable, can be implemented in the near term to provide only the switched video and interactive data capabilities. Cost estimates are presented for this reduced capability system that are almost an order of magnitude lower than was previously thought possible for low-usage receive-only switched video service. It is expected that telephony con be added economically to this reduced capability system, as digital switching of telephony becomes practical. A brief discussion of the implications of this system approach for optical fiber systems is also given.
5 citations
01 Oct 1975
TL;DR: In this paper, the authors describe the use of a single-stage phase-lock-loop oscillator to provide high gain power amplification of FM communication signals as used in radio relay of multiplex telephone and television.
Abstract: This paper describes the use of a "single-stage" phase-lock-loop oscillator to provide high gain power amplification of FM communication signals as used in radio relay of multiplex telephone and television. The paper is largely theoretical, dealing with the relationship of the loop parameters to the expected performance. Measured data are also provided for two experimental amplifiers of this type. Both theory and experiment indicate that the technique offers distinct advantages for the intended application compared with multi-stage reflection amplifiers.
3 citations
TL;DR: A real-time, on-line information storage and retrieval system for telephone information service has been designed at the Telecommunication Laboratories of Taiwan.
Abstract: A real-time, on-line information storage and retrieval system for telephone information service has been designed at the Telecommunication Laboratories of Taiwan. The input and output of the system are processed in Chinese via a keyboard and a graphic display unit respectively. System functions include sorting, merging, updating, displaying, and printing of data.
2 citations
01 Jan 1975
1 citations
Proceedings Article•
01 Sep 1975
TL;DR: In this article, a cost effective solution to the problem of providing a small private exchange has been met by combining central digital control with distributed digital interfaces, and the basic exchange system has been designed as a six-teen line intercom utilising four trunks, although two systems can be linked.
Abstract: A cost effective solution to the problem of providing a small private exchange has been met by combining central digital control with distributed digital interfaces. The basic exchange system has been designed as a six¬ teen line intercom utilising four trunks, although two systems can be linked. Four wire distribution is used, speech and control data being car¬ ried independently as analogue and time multiplexed data respectively, the central control scanning each of the sixteen telephone instruments sequen¬ tially.
1 citations
01 Jan 1975
01 Oct 1975
TL;DR: This review deals with the general principles of telecommunication traffic, and their application to exchange and network engineering.
Abstract: Given well designed and reliable equipment, the efficiency of a telecommunication system depends on having sufficient equipment to meet requirements for normal service, with a reasonable margin for peak traffic. At the same time, the cost of the network must be low enough to permit the provision of an efficient service to the subscriber on acceptable terms. The determination of the amount and arrangement of equipment, so as to achieve an optimum balance between service and cost, is one of the most important aspects of telecommunication-system design, which has attracted the attention of engineers and mathematicians since the early days of telephony. Modern technical developments, including the application of electronic switching and control techniques, have posed many new traffic problems. This review deals with the general principles of telecommunication traffic, and their application to exchange and network engineering.
01 May 1975
TL;DR: A low-cost multichannel system for telemetering and remote signaling ``upon request'' that is intended for use over dial-up channels of the public telephone systm or other voice grade channels with comparable quality.
Abstract: The article describes a low-cost multichannel system for telemetering and remote signaling ``upon request''. The system is intended for use over dial-up channels of the public telephone systm or other voice grade channels with comparable quality. Continuous transmission over dedicated links is also feasible.
TL;DR: A digital hardware used for the measurements of noise power in a telephone channel in accordance to the CCIR recommendations for radio-relay links is described and it is shown how the hardware can easily be turned into a digital real RMS measuring instrument.
Abstract: The article describes a digital hardware used for the measurements of noise power in a telephone channel in accordance to the CCIR recommendations for radio-relay links. The described digital system avoids the impairments of the previously used analogue systems. Finally, it is shown how the hardware can easily be turned into a digital real RMS measuring instrument.