Sound field enlarging device

Abstract

Abstract PURPOSE:To enlarge the reproduced sound field, by generating a phase difference signal of stereo signals L and R by using phase shifters having different phase characteristics and by generating an output signal which is phase adjusted by the difference between the signal L and the signal L by mixing the phase difference signal and the original signals L and R. CONSTITUTION:A phase theta1 is given to inputted signals L and R through phase shifters 11a and 11b, and another phase theta2 is given to the signals L and R through phase shifters 12a and 12b. Then, a phase difference signal is produced by introducing the outputs of the phase shifters 11a and 12a to a subtractor 13a, and another phase difference signal is generating by introducing the outputs of the phase shifters 11b and 12b to another subtractor 13b. When one of the two phase difference signals is directly added to the original signals L and R and the other phase difference signal is added to the original signals L and R after inverting the phase, output signals shown by the formula A and B are obtained. The timbre and the normal acoustic image contained in the original signals are secured by the 1st term, and by the symmetrical phase difference signal outputs defined by the 2nd term the reproduced sound field is enlarged, and thus, the presence is improved.

Inventors

• 👤 Norio Mogi
• 👤 憲夫 茂木
• 👤 Keiichi Okao
• 👤 敬一 岡尾

Bibliographic Details