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If the microphone is insensitive to sounds coming from the side, this characteristic can be used to reduce the pick-up of projector noise. In a small room, however, the improvement is largely invalidated by noise reflected from walls and the ceiling.
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sensitive only to sounds coming from certain directions. You can use this property to minimise projector noise. Choose the recording set-up so that the insensitive axis of the microphone is directed towards the projector while the sensitive axis faces the commentator.
Although this will make a big improvement, it is seldom a complete cure. This is because the walls of an average room reflect sound to a large extent so that it arrives at the microphone from many directions. In this respect, a large room gives less trouble than a small one and a furnished room is better than an empty one.
4. Whatever microphone you use, do not stand it close alongside the projector. Get somebody to work the projector while you use the microphone at the full distance permitted by its lead. An obvious elaboration is to lengthen the lead so that you can take the microphone further from the projector. However, technical difficulties arise here. A long lead will often result in hum or a loss in quality. If it is essential to extend the microphone lead, seek the assistance of a good radio serviceman.
5. Generally speaking, it is simple to reduce the noise at the projector itself. You can often effect a substantial reduction by standing the projector on something soft. A
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