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Impulse Response of Very Small Rooms

Many sound rooms are very small, but the requirement for sound quality within them is usually no less than in larger rooms. Accurate measurement and interpretation of their impulse response is crucial but is complicated by tight quarters, non-diffuse sound fields, and rapid decay of sound. Issues of sound field, hardware, and signal processing are identified for consideration before measurements begin, and general methods are demonstrated for overcoming technical hurdles specific to small room measurement. Some suggestions for proper application of analysis techniques are also offered. These difficulties have been overcome by means of a high-speed DSP-based data acquisition system and an impulse measurement capability based on maximal length sequence and fast Hadamard transform techniques, and very careful signal processing and analysis. A case study of a successful measurement using these methods is presented.

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