| 摘要 |
PURPOSE: To provide an audio signal transmission circuit by which a user can enjoy a natural audio signal by eliminating the distortion of the sound image which can be avoided neither in a speaker nor a headphone, simultaneously correcting an amplitude and a phase, keeping only the frequency band of the prescribed intermediate frequency band of transmission characteristics constant and reproducing source sound quality excellent in fidelity. CONSTITUTION: When switch controls are performed for switching devices 7L and 7R, the output characteristics of speakers 4L and 4R are measured and the correction filter factors of convolvers 2L and 2R are determined, and a control is performed so that the response characteristics of the speakers may corrected by imparting the determined correction filter factors to the convolvers 2L and 2R and performing a convolution calculation, the impulse response f0 (t) of a specified characteristic is depended on speaker characteristics, the only frequency band of a prescribed middle band is selected to be flat and the filter factors of the convolvers 2L and 2R are set. |
