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# Communications, Radar and Signal Processing, IEE Proceedings F

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Displaying Results 1 - 11 of 11
• ### Subjective tests on visual telecommunications standards

Publication Year: 1980, Page(s):3 - 8
| | PDF (795 KB)

Quality grading tests have been conducted to investigate the subjective effects of various combinations of transmission channel bandwidth, television-line standard and display size. The test pictures used were head-and-shoulders views. 313-line signals transmitted through a channel with 1 MHz bandwidth proved to be more acceptable than 625-line signals transmitted through the same channel. A small... View full abstract»

• ### Low sidelobe patterns from thinned arrays using multiplicative processing

Publication Year: 1980
Cited by:  Papers (7)
| | PDF (800 KB)

The paper describes a new technique for achieving low-sidelobe directional patterns (¿¿35 dB) from thinned arrays. The concept employs multiplicative processing and is therefore restricted to receiving arrays. It is shown that a total of about 3N elements can synthesise a pattern corresponding to a filled array of N2 elements so that large thinning factors, in excess of 90%, are realisable for lar... View full abstract»

• ### Method of estimating the capacity of multipair cables to carry low-speed p.c.m. transmission systems

Publication Year: 1980, Page(s):16 - 21
| | PDF (741 KB)

A method is described whereby the probability that a multipair cable will successfully support a number of low-speed digital pulse-code modulation (p.c.m.) transmission systems operating on pairs selected at random may be estimated. The calculation assumes that the near-end crosstalk attenuation between pairs has a truncated lognormal distribution, but does not assume that the total interference h... View full abstract»

• ### Optimisation of a digital autodetector for linear and logarithmic radar video

Publication Year: 1980, Page(s):22 - 29
| | PDF (715 KB)

Procedures are described which lead to empirical optimisation of a digital radar autodetector by adjustment of quantisation and integration parameters. Receiver nonlinearity is dealt with exactly by appropriate transformation of quantisation thresholds. The statistical modifications of quantised data introduced by a digital leaky integrator are treated by a convolution process. Performance is calc... View full abstract»

• ### Book review: Digital Methods for Signal Analysis

Publication Year: 1980
| PDF (82 KB)
• ### Analysis of feedback communication systems

Publication Year: 1980, Page(s):30 - 33
| | PDF (378 KB)

In this paper a quantitative analysis of a general feedback communication system is undertaken. The model considered is sufficiently general that the resulting analysis may be used when considering most feedback schemes. Mathematical expressions are derived for the probability of error and transmission efficiency of a feedback scheme when finite and infinite numbers of repetitions are possible, an... View full abstract»

• ### Use of generalised resolution methods to locate sources in random dispersive media

Publication Year: 1980, Page(s):34 - 40
Cited by:  Papers (2)
| | PDF (637 KB)

Random dispersive media such as the shallow-water sound channel cause the far field of a point source to be random in time and space. Consequently, resolution methods such as d.f.t., maximum-likelihood estimator¿¿ ormaximum-entropy method¿¿ are useful only to a limited extent for estimation of source parameters such as range, bearing or depth. This is because those methods are based on the assum... View full abstract»

• ### Design of gradings subjected to unbalanced offered traffic

Publication Year: 1980, Page(s):41 - 48
Cited by:  Papers (1)
| | PDF (724 KB)

This paper discusses the structural properties of various gradings in relation to the losses resulting from the traffic offered to the inlet groups. On the basis of earlier researches on optimum graded structures, an attempt is made to obtain interconnecting schemes which will provide the maximum traffic carrying capacity of the serving trunks. The performance of these interconnecting patterns und... View full abstract»

• ### Fast computation of multidimensional discrete fourier transforms

Publication Year: 1980, Page(s):49 - 52
Cited by:  Papers (8)
| | PDF (491 KB)

An algorithm is presented, for the computation of multidimensional Fourier and Fourier-like discrete transforms, which offers substantial savings in the number of multiplications over the conventional fast Fourier transform method. Implementation of this algorithm, and the use of it to compute discrete Fourier transforms of real sequences, are also described. View full abstract»

• ### The JSRU channel vocoder

Publication Year: 1980, Page(s):53 - 60
Cited by:  Papers (18)
| | PDF (1223 KB)

During the period from 1956 to 1966 the UK Government's Joint Speech Research Unit was conducting research into channel vocoders, culminating in a laboratory-built design suitable for evaluation by potential users over digital transmission networks at 2400 bit/s. The success of the basic vocoder design was such that it has since been engineered in various forms for widespread operational use, usin... View full abstract»

• ### IEEE International Radar Conference: Sessions and papers

Publication Year: 1980
Cited by:  Papers (1)
| PDF (135 KB)