DOI:10.1049/ree.1979.0041

出版商:IERE    

年代:1979

数据来源: IET

DOI:10.1049/ree.1979.0046

出版商:IERE    

年代:1979

数据来源: IET

DOI:10.1049/ree.1979.0047

出版商:IERE    

年代:1979

数据来源: IET

DOI:10.1049/ree.1979.0048

出版商:IERE    

年代:1979

数据来源: IET

摘要:

The development of new products has always been fraught with the problems associated ith achieving a design suitable for volume production capable of yielding consistent performaceresults without the need for constant technical or engineering supervision or adjustment. The achievement of this goal has become progressively more difficult as both products and technology have become increasingly complex and systems have become larger and more sophisticated. Methods and disciplines for achieving satisfactory designs are discussed and compared with past practices. Recommendations are given for the organization and control of the development processand their application to the engineering of major new products.

DOI:10.1049/ree.1979.0049

出版商:IERE    

年代:1979

数据来源: IET

摘要:

Both the reduction of spectrum width of a s.s,b. transmission and its lower spectrum pollution, due to the absence or diminution of a carrier component, make this mode of modulation attractive for future use in land mobile radio. Outstanding problems are frequency stabilityand a.g.c. The latter cannot be of the ‘hang’ type used at h.f. In the Wolfson system a low amplitude audio tone transmitted at the centre of the audio pass-band is used for both a.g.c. and a.f.c. A hierarchy of receivers, from simple, manually clarified to sophisticated, fully automatic types, is described, to meet the needs of varied users. The proposed systemappears to have several advantages over other contenders

DOI:10.1049/ree.1979.0050

出版商:IERE    

年代:1979

数据来源: IET

摘要:

Teletext as a communication medium has aroused considerable interest amongst those appreciating the virtues of television display and the power of universal interactive informationhandling. This paper outlines a powerful use of teletext which has, hitherto, been ignored. The shape of component profiles, when encoded into Teletext graphics characters, offers profoundadvantages in applications of visual sensory feedback for component orientation prior to automatic handling

DOI:10.1049/ree.1979.0051

出版商:IERE    

年代:1979

数据来源: IET

摘要:

A description is given of the design and implementation of a loose–locked oscillator (l.l.o.) tuning system with 1 Hz stepsize in a commercial communication receiver. A single tuning knob controls the tuning speed according to a non-linear joystick principle, not generallyused in this application.To estimate the established quality of the l.l.o. a comparison is made with a conventional synthesizer. The digital control facilities of the tuning system provide a conversion to convenient operation combined with good stability, which makes the receiver applicable to both fixed frequency and variable frequency communication links.

DOI:10.1049/ree.1979.0052

出版商:IERE    

年代:1979

数据来源: IET

摘要:

An iterative pipeline carry save array multiplier module (PCAMM) is proposed which hasa constant through put rate for every number of data bits. Data in 2s complement form are processed directly according to the Robertson algorithm. The PCAMM was realized in ECL–technologyfor6–bit data with a throughput rate of 35 x 104multiplications per second. Multipliers ofthis kind are the heart of the 12–bit arithmetic unit of a fast signal processor which has been developed at Technical University of Munich.

DOI:10.1049/ree.1979.0053

出版商:IERE    

年代:1979

数据来源: IET

摘要:

A loose braid coaxial cable is studied and two possible interpretations of the surfacetransfer impedance sign give two mathematical solutions of the characteristic equation; the two solutions correspond to two different modes, the coaxial and the ‘Goubau’ modes, which maypropagate according to two different launching processes.Solutions for the propagation constant, distribution of power between the inside and the outside of the coaxial structure, and outside radial decay are presented.

DOI:10.1049/ree.1979.0054

出版商:IERE    

年代:1979

数据来源: IET