| 摘要 |
PURPOSE:To eliminate simply the deterioration of characteristic by changing the selection and an amount of the correction of octave bands such as 1/1, 1/2, 1/3 only in a band pass required for the correction by the frequency characteristic of a loud speaker system measured in a listening space. CONSTITUTION:An audio input from an audio input terminal 6 is inputted to plural equalizer amplifiers 101-10n connected in parallel, outputs are synthesized and amplified 9 and outputted to an audio output terminal 7. The equalizer amplifier 10i can selectively change octave bands such as 1/1, 1/2, 1/3 in an audible frequency band pass of the correcting frequency and further constitutes the same circuit capable of changing the amount of the correction such as a gain, a quantity of attenuation. According to the frequency characteristic of a loud speaker system measured in an audible space such as a theatre, a hall, on the band pass required for the correction, the octave band and the quantity of the correction of the equalizer amplifier 10i are changed. Thereby, the deterioration of characteristic can be deleted by a small number of the equalizersamplifiers. |
