A Multi-Channel System for Sound Control in the Open Space

作者：Ciesielka Wojciech^*

来源：Archives of Acoustics, 2009, 34(4): 559-577.

• sound control
• multi-channel systems
• digital system
• creation of the sound space

In the paper, a multi-channel system for sound control is presented. The system enables creation of the sound space through generation of the acoustic signals with the help of sixteen independent controlled sound sources, in accordance with the accepted quality criterion.
The heart of the realized control system is digital filters system and the digital delay lines implemented in ADSP BF-537, the multi-channel card by Analog Device Company, equipped with the extension module. Besides the above-mentioned card with the microprocessor, the system is constructed of a number of subsystems, including the acoustic signal generation system, the multi-channels power amplifier and sixteen sound sources equipped with the special closed box enclosures.
The system design was preceded with the laboratory and model-and-simulation measurements and the verification measurements carried out in the field. The laboratory tests were made in free sound field conditions in the anechoic chamber of the Department of Mechanics and Vibroacoustics, AGH University of Science and Technology. The model-and-simulation research was carried out using the geometrical methods implemented in the Raynoise package. The final stage of the work included the tests confirming the operation effectiveness of the designed and realized system, which were carried out; in the open space - in the selected area.
As a part of the model-and-simulate work and the verification research, the A-sound level and Speech Transmission Index (STI) distributions were determined in the control area and in the protected area.

• 出版日期2009