Broadcast Sound Technology by Michael Talbot-Smith

By Michael Talbot-Smith

The goal of this publication is to offer a transparent and fairly easy-to-read rationalization of the underlying ideas of contemporary audio know-how. the purpose of the e-book is to make sure that after examining it an individual may be taken right into a radio or tv studio for the 1st time and after having a look around and learning the labels at the gear, could start to have a good seize of what was once there, why it used to be there and the way it functioned

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What is needed is a means of determining the equivalent sound level, L eq . To explain this let us take an L eq of 92dBA. This means that whatever variations there may be in the sound level, the equivalent over a suitably long period is a steady sound of 92 dB A. There may be short periods of very high levels perhaps 95 or even 100 dB A, but if these really are brief and the rest of the time sound levels are low, maybe conversational levels of around 60 dB A, then the L eq could easily be no more than 70 dB A over a working day.

For example, the bare shell of a studio might have a reverberation time of 5 or 6 seconds, or maybe more. 5 seconds then, given the dimensions of the studio, it isn't difficult to calculate how many sabines of absorber are going to be needed. It must be added, though, that the answer is not likely to be very accurate! In practice a fair amount of adjustment is needed when the absorbent material is in place. The Sabine formula is reasonably accurate when the amount of absorption is small. 0). Common sense says that the reverberation time will be zero, but the calculation doesn't come to this.

Alternatively they can be used to control particular troublesome frequencies. 7 illustrates the resonator named after Hermann von Helmholtz, German scientist, 1821-1894. 7 Basic Helmholtz resonator m in the neck 'bounces' against the spring (or compliance) provided by the volume of air V. Although the mass m may be very small the compliance provided by V is such that quite low Reverberation 51 resonant frequencies can occur in units of modest size. Easily obtainable examples are empty whisky or gin bottles, which usually resonate at about 100-120 Hz when the researcher blows across the top.

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