PURPOSE: To perform adjustment in a short period of time by supplying a reference audio signal, analyzing an audio signal obtained by collecting a sound emitted from a speaker by a microphone corresponding to the signal, and setting acoustic correction based on analyzed result.
CONSTITUTION: A pink noise being the reference audio signal is supplied from an analyzer 6 to a DSP part 2, and a sound in accordance with the noise is emitted from the speaker 4. The sound is collected by the microphone 8, and is inputted to the analyzer 6, and sound volume from the speaker 4 is set at a value determined in advance by adjusting the gain of an amplifier 3 which supplies the audio signal to the pertinent speaker 4. In other words, when it is decided that a target curve is within a correction range, the adjustment of a network gain is performed corresponding to the target curve, thereby, each channel gain of a network is automatically set. Also, the adjustment of a parametric equalizer is performed, and the automatic setting of gains f0, Q are performed. Furthermore, level adjustment is performed automatically.
SHIBAZAKI MITSUAKI
KIKUCHI KAZUO
