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BRP-PACU
BRP-PACU is a dual channel FFT audio analysis tool. It is designed to be used with an omnidirectional calibrated microphone to configure any sound system with an appropriate equalization and delay. It compares the output of the system to the input of the system to obtain the transfer function〔The transfer function is defined by in, e.g., 〕 of the system. These data allow one to perform final equalization using just the input/output of the DSP or any other device used for Equalization.
== Theoretical basis ==
This software program uses a Transfer Function Measurement method to compare the output of a (unprocessed) loud-speaker system and room combination to the input signal which is usually filtered pseudorandom noise.〔The basic principle of the transfer function analysis is a dual channel measurement where one channel is designated as "known" and the other channel is "unknown". , 〕 Because the sound has a propagation time from the exit point of the transducer to the measurement device, a delay must be inserted in the reference signal to compensate. This delay is automatically found by the software to aid in practical system measurement.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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