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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 1992-11 : A modular wideband sound absorber G.D. Plumb The absorption coefficients were measured of various depths of RW2 grade Rockwool laid directly on the floor of the ISO-Standard reverberation room at BBC Research Department. The Rockwool was very effective as a wideband sound absorber. A new absorber was designed and tested, having the dimensions of existing BBC type A modular absorbers and containing RW2 Rockwool. The new absorber has a smoother absorption coefficient...
Topics: absorption, absorber, rockwool, infill, hardboard, plywood, modular, coefficient, absorbers, panel,...
R&D Report 1988-14 : On the design of loudspeakers for broadcast monitoring. C.D. Mathers By designing its own monitoring loudspeakers for about the past forty years, the BBC has achieved a degree of continuity and consensus in a subject where there are almost as many opinions as there are designers. This report describes the approach that has evolved within the Corporation towards design and assessment, and indicates how calculation and objective measurement are supplemented by experience...
Topics: loudspeaker, bbc, design, frequency, damping, coil, acoustic, unit, diaphragm, drive, relative...
R&D Report 1996-08 : The COFDM Modulation system: The heart of Digital Audio Broadcasting. P. Shelswell Digital audio broadcasting offers the potential to give every radio in Europe the sound quality of a compact disc. To accomplish this, it requires a rugged method of transmission. The coded orthogonal frequency division multiplexing (COFDM) modulation system was developed to meet this need. This Report describes the reasons why a new modulation process was needed, and explains how the...
Topics: symbol, cofdm, signal, frequency, bbc, modulation, carriers, digital, dab, fourier, modulation...
BBC Research and Development Reports
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R&D Report 1955-36 : Sound level distribution in concert halls. M.W. Greenway, T. Somerville, F.L. Ward. This report describes measurements recently carried out in five concert halls to determine the difference in sound level between the seats close to the orchestra and those at the back of the hall. The source of sound was an orchestra in all cases and measurements were made both during rehearsals and public performances.
Topics: level, reverberation, hall, reflector, microphone, halls, reverberant, sound, stalls, direct,...
R&D Report 1966-21 : Acoustic tests in Broadcasting House, London: The anomalous sound transmission between Studio S2 and the Concert Hall. C.L.S. Gilford, A.N. Burd This report describes investigations to ascertain the cause of excessive transmission of sound between the Concert Hall, Broadcasting House and Studio S2 which lies below it.
Topics: concert, sound, studio, transmission, floor, void, measured, hall, insulation, studios, control...