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BBC Research and Development Reports

A collection of BBC Research and Development reports and white papers, dating from the 1960s through to 1996.

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R&D Report 1954-34 : A new photo-electric optical bench. W.N. Sproson An outline of the photoelectric method of testing lenses is given, together with some details of the two types of test pattern now in use and the form of aperture correction necessitated by the finite width of the scanning slit. The photoelectric test bench is described and a few preliminary results are quoted.
Topics: lens, modulation, wave, test, bench, microscope, optical, pattern, slit, photoelectric, wave...
R&D Report 1956-10 : Reception disturbances over North Atlantic paths during the years 1947 to 1954. T.W. Bennington The records of reception conditions over North Atlantic paths which are regularly made at Tatsfield have been examined for the eight years 1947 to 1954, with a view to learning something about the effects of ionospheric disturbances upon reception over these paths. The nature of the long-period and seasonal variations in the incidence of such disturbances has been...
Topics: disturbance, magnetic, reception, disturbed, ionospheric, tatsfield, conditions, disturbances,...
R&D Report 1954-08 : A determination of subjective white under four conditions of adaptation. W.N. Sproson Subjective white has been determined for twelve colour-normal observers under four conditions of adaptation. Two methods were used and a comparison is made between the results. Further comparisons are made between the results of the present investigation and those of other workers. The report concludes with a recommendation for subjective white for television viewing with a tungsten...
Topics: observers, method, adaptation, colour, tungsten, observer, chromaticity, white, daylight, adapting,...
R&D Report 1954-09 : Information on short wave propagation conditions from reception results on fixed frequencies. T.W. Bennington Regular hourly observations made at Panorama, South Africa, on reception of five fixed frequencies from Standard Frequency Station WWV have been analysed to obtain information on propagation conditions and their daily and seasonal variations, for comparison with those given by world charts of predicted MUF. The results indicate that the predications agree well...
Topics: reception, muf, frequencies, gmt, propagation, signal, frequency, predicted, luf, panorama, sinpo...
R&D Report 1955-25 : The subjective white point under the condition of no adaptation. W.N. Sproson Four experiments are described in which the white point or colour balance point has been determined. It is shown that while they do not agree in their results, there is a strong correlation when the white point is considered in terms of the average value of the colour temperatures used in a given experiment. The results suggest that various types of colour film will project quite...
Topics: colour, optimum, temperature, white, experiments, kodachrome, eastman, temperatures, illuminant,...
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R&D Report 1954-21 : A comparison of two zoom lenses W.N. Sproson, M. Gilbert The investigation described undertaken in view of the interest shown in these lenses by Television Outside Broadcasts Department and other specialist departments in Engineering Division. The tests can be divided into two main groups, (a) determination of axial modulation/frequency characteristics and (b) general appraisal of image quality over the 40mm diagonal field required for the image orthicon camera. Some...
Topics: lens, focal, watson, modulation, length, hobson, zoom, aperture, image, range, zoom lenses, square...
R&D Report 1957-02 : Report on International Colloquium on wave propagation, Paris - 17th to 21st September, 1956. T.W. Bennington This report summarises the International Colloquium on Wave Propagation which took place in Paris on 17-21st September 1956.
Topics: propagation, ionospheric, scattering, tropospheric, absorption, auroral, meteorological,...
R&D Report 1957-08 : Propagation of broadcast transmissions over the U.K./Johannesburg circuit during 1956. T.W. Bennington This report contains the results of an analysis of the signal strength and some other data obtained from the reception log sheets compiled at the Panorama, South Africa, receiving station of the South Africa Broadcasting Corporation. These deal with reception of BBC transmissions directed towards South Africa during every day of 1956. The results are presented in the...
Topics: signal, strength, observation, frequency, muf, luf, frequencies, gmt, signal strength, predicted,...
R&D Report 1956-23 : Compatibility of the NTSC colour television system adapted to the 405-line standard: Field trials. W.N. Sproson Three series of field trials have been undertaken to test the compatibility aspect of the adapted N.T.S.C. colour television system.
Topics: chrominance, picture, observers, grades, grading, tests, questionnaires, slides, dots,...
R&D Report 1959-05 : Reception of Crystal Palace 51.5 Mc/s and 45.0 Mc/s channels in South Africa during the increasing phase of the sunspot cycle. T.W. Bennington Reception reports have been received from the Panorama, Johannesburg receiving station of the. South African Broadcasting Corporation in respect of the reception there during the period 1000-1800 GMT of the Crystal Palace 41'5 Mc/s and 45'0 Mc/s frequencies and the data are here presented. The reports have been analysed for 28...
Topics: reception, muf, gmt, variations, monthly, values, percentage, sunspot, mup, frequency, sunspot...
R&D Report 1954-17 : Examination of the distribution with frequency and time of the field of WWV at Tatsfield during six months near the sunspot minimum. T.W. Bennington Hourly measurements of the field of WWV on 5, 10, 15 and 20 Mc/s have been made at Tatsfield over the greater part of the day for the last six months of 1953, and these have been analysed. The departure and arrival angles corresponding to the different propagation modes for the different frequencies, times of day and...
Topics: field, frequencies, frequency, mode, predicted, measurements, muf, contours, absorption, luf,...
R&D Report 1956-30 : Colour Television: The adaptation of the NTSC system to UK standards Part 1: The colorimetry of analysis and synthesis W.N. Sproson, J.G. Ingleton The mathematical transformations involved in specifying the ideal analysis filters for a colour scanner are described using the notation of classical matrix algebra. The colorimetric performance of an actual scanner is evaluated in terms of MacAdam's just noticeable differences. An electrical matrixing method is described...
Topics: colour, spectral, scanner, shaping, reproduced, dichroic, matrix, colours, chromaticity, filters,...
R&D Report 1957-01 : The subjective sharpness of television pictures. W.N. Sproson The subjective sharpness of television pictures has been measured using a comparison technique and a multi-criterion scale for assessment. Two types of degrading network were used and the subjective sensitivity to changes in equivalent rectangular bandwidth has been evaluated for both static and moving pictures. http://www.archive.org/editxml/bbc-rd-reports-1957-01
Topics: sharpness, picture, comparison, bandwidth, networks, liminal, observers, subjective, delay, factor,...