| 摘要 |
PURPOSE:To execute securely a sufficient sound field correction even if right and left speakers and a sound receiving point are asymmetric by correcting a characteristic of an equalizer circuit for a right or left based on a frequency analyzed result of the right or left channel. CONSTITUTION:When an autoequalizer button of an operating part 28 is operated, a storage means 34 is controlled by a storage control means 35, and an initial value of an equalizer circuit, which is stored on the stroage means 34, is read out, which causes equalizer circuits 26R and 26L to set to initial values. Measuring signals radiated from a right speaker are sound-collected by a microphone, and the collected sound is added as level data to an arithmetic means 33 through an A/D converter circuit 32. The arithmetic means 33 obtains an average, and a difference between said average and the level data of each frequency band is obtained. This difference data is added to an equalizer circuit 27R through a switching means 37, and the attenuation degree of each electronic volume is modified. The correction of the left channel can be made in the same manner. |
