Patent ID: 9247371
Filing Date: 2016-01-26
CPC Classification: H04R,H04S

Claim Text:
1. A sound processing apparatus comprising: a strength adjusting section configured to adjust strengths of left, right, left rear, and right rear channel sound signals; a first signal selecting section configured to adjust a strength of one of the left and left rear channel sound signals to produce a left channel effect signal; a second signal selecting section configured to adjust a strength of one of the right and right rear channel sound signals to produce a right channel effect signal; a sound image area expanding section configured to produce left and right channel sound image signals whose sound images are localized at positions of left and right channel virtual speakers arranged outside left and right 2-channel speakers, by adding a right addition signal and the left channel effect signal and adding a left addition signal and the right channel effect signal, wherein the right addition signal is produced by adding the right channel effect signal and a right delay signal which is obtained by delaying the right channel effect signal, and wherein the left addition signal is produced by adding the left channel effect signal and a left delay signal which is obtained by delaying the left channel effect signal; a signal combining section configured to add a left channel sound signal which has been subjected to a strength adjustment of the strength adjusting section and the left channel sound image signal, and add a right channel sound signal which has been subjected to a strength adjustment of the strength adjusting section and the right channel sound image signal; a first localization controlling section configured to localize a first sound image at a region between the left channel speaker and the left channel virtual speaker by controlling the strength adjusting section so as to control the strength adjustment of the left channel sound signal and the strength adjustment of the left channel effect signal produced by the first signal selecting section, by selecting the left rear channel sound signal at the first signal selecting section, while configured to localize a second sound image at a region between a left rear channel speaker and the left channel virtual speaker by controlling the strength adjusting section so as to control the strength adjustment of the left rear channel and the strength adjustment of the left channel effect signal produced by the first signal selecting section, by selecting the left channel sound signal at the first signal selecting section; and a second localization controlling section configured to localize a third sound image at a region between the right channel speaker and the right channel virtual speaker by controlling the strength adjusting section so as to control the strength adjustment of the right channel sound signal and the strength adjustment of the right channel effect signal produced by the second signal selecting section, by selecting the right rear channel sound signal at the second signal selecting section, while configured to localize a fourth sound image at a region between a right rear channel speaker and the right channel virtual speaker by controlling the strength adjusting section so as to control the strength adjustment of the right rear channel and the strength adjustment of the right channel effect signal produced by the second signal selecting section by selecting the right channel sound signal at the second signal selecting section.