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Application
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Instrument selection, concert |
Floor
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2,980ft2
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Ceiling Height
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10 feet
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Capacity
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75-150
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Volume [N]
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29,800ft3
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V/N
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397ft3/N |
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Outline
Playing musical instruments in a room with a low ceiling height can be a challenging experience. As you can imagine, it is difficult to attain reverberance that is sufficient for musical practice. And when the audience comes into the room to enjoy a small concert, the absorption added by the audience makes the room even more dry. To achieve a more reverberant room we would typically need to make the ceiling higher and to remove the absorption added by the audience during concert use.
The AFC system was designed and installed to solve these two problems by virtually changing the acoustical attributes of a space without performing architectural alterations. One function of the AFC system, "Room Size Control," virtually increases the room volume of a space (ceiling height) without changing the architecture. By increasing the room volume, a more reverberant sound is created, similar to that of a typical concert hall. The second function, "Liveness Control," increases the sound volume of a room by adding energy, which is equivalent to removing the added audience absorption. Even when a large audience is present for a performance, this method can hold the room reverberated as if the space was empty. The system configuration and speaker/microphone location are shown in Fig.1 and 2.
By introducing these two methods, we have created a flexible sound field pattern that is suitable both for solo performances, such as the selection and practice of instruments without audience (selection pattern), and for concert performances with audience (concert pattern). For the selection pattern, the Room Size Control method was used to extend the reverberation. For the concert pattern, Room Size Control with Liveness Control was used to extend the reverberation while increasing the sound volume and virtually removing the added absorption. The reverberation time (RT at 500Hz) was increased from 0.5sec to 1.1sec for the selection pattern, and from 0.5sec to 1.3sec for the concert pattern (Fig.3)
System Configuration
Location of speakers and microphones
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:wall loudspeakers |
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:ceiling loudspeakers |
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:microphones |
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Reverberation Time(empty)
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Copyright (C)2008 Yamaha Corporation. All rights reserved.
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