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March, 1950
GLOVER AND MCLAREN [ ACOUSTICS
77
Fig. 3. High Speed A.F. Recorder.
Courtesy of Dawes Instruments Ltd.
Rooms having quite different reverberation characteristics might have the same total period of reverberation, and audiographic methods of measurement are therefore preferable to total time methods.
II. ACOUSTIC DESIGN OF STUDIOS
John McLaren, B.Sc, A.M.I.C.E.*
THE problem of the recording studio, which can be used either for broadcasting purposes, for gramophone recording or in film work for the_ post-recording of sounds or music, will now be considered. The type of studio is the same or similar in each case.
What is acoustics ? A fair definition would be that it is the scenery of sound. To take an analogy from photography, a portrait may be taken of a person, and by the use of a suitable background and by the proper arrangements of the lights, an experienced photographer can make a satisfactory and pleasing portrait. A distracting background and hard lighting will cause the portrayal of the subject to be confusing ; a neutral background and soft diffused lighting will produce an uninteresting photograph. We can apply this analogy to acoustics, in this sense : the first example is like an orchestra playing in a hall which has too long a reverberation time and also suffers from echo and dead spots ; the second example is like an orchestra playing in a hall which is so festooned with heavy drapings that the reverberation time is almost zero.
It is, therefore, the object of the acoustical designer to plan a hall or studio so that its reverberation time and its reverberative effect form a setting which shall show off the performance of the players (in the case of an orchestra) to its best advantage. Physical and Psychological Measurement
As in photography it is the eye that decides the artistic merit or otherwise of a photograph, so it is the ear that decides the acoustic merit or otherwise of a studio or concert hall. The importance of this point cannot be overstressed, because in these days when there are instruments which can measure almost everything, there is a tendency to become " meter-minded," and to think that if a measurement conforms to a certain pre-conceived standard, then all is well. Nothing could be farther from the truth ; a meter can only
* C. W. Glover and Partners.