May 2013
www.tvbeurope.com
TVBEurope 47 Audio for Broadcast
You will hear how your voice gets amplified. This is due to low frequencies reflecting off the wall. In essence the wall is a secondary sound source. In fact, when it coincides with the direct signal it will be approximately 6dB stronger. Naturally the same thing
happens when you put a loudspeaker next to a hard wall. Even worse if you put the monitor in a corner — then you will have two reflecting surfaces and thus two second sound sources and a boost of 12dB!
Surround sound
Thus far we have just been talking about a stereo set up. As you can imagine these problems become more complex in a surround sound set up with five or seven speakers and one or two subwoofers. Still, the same principles apply; look for symmetry, keep the same distance, etc.
At Genelec we have two
different product lines for professional audio monitoring applications. We have the 8000 series of analogue monitors where control of the frequency response and range is via dipswitches sitting on the back of the monitor. Our parameters come from the vast library of acoustic measurements we’ve captured from control rooms all over the world. These measurements have given us enough statistical data to securely design these filters for the real world; we know how a control room performs and we can design filter for it. Our second product range is our DSP-based 8200 series of monitors. DSP allows a digital signal processor to take care of the acoustic alignment. Our GLM (Genelec Loudspeaker Manager) has AutoCalTM an optional piece of software that simplifies the acoustic calibration process so that any computer literate person is able to acoustically align his own monitors. This could be a stereo pair or a much more complex surround system. AutoCalTM gives you a well-calibrated system in less than 10 minutes, depending on the complexity of your space.
Our discussion so far has
covered the audio monitor without consideration of the types of rooms used in broadcasting production today. In most cases, there is very little, or indeed no acoustic treatment whatsoever. An acoustically well-designed environment is the best way towards ensuring good monitoring performance.
Unfortunately it is now rare
that qualified studio designers are used to design production spaces. It is not uncommon to find broadcast production being done in a normal office space, which has been created by an
interior designer with no knowledge of audio or acoustics. Glass walls are a favourite but
don’t fit well with acoustic treatments. In this situation, our AutoCal-equipped monitors can be a great help. Another is in
OB vans where room conditions are far from ideal. In summary, a well-calibrated and acoustically aligned monitoring system eliminates guesswork and gives the audio engineer the accuracy that he
needs to create the excellent quality audio material modern broadcasting demands. For more information
download The Monitoring Set Up Guide from
www.genelec.com
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