| 摘要 |
PROBLEM TO BE SOLVED: To develop a 3-dimension 3D monaural/stereo system with a high presence effect by processing left and right signals with a phase difference subject to Hilbert transformation as input signal processing to the 3-dimension 3D stereo system so as to avoid unnatural emphasis of a reproduced low frequency sound in the 3-dimension 3D monaural/stereo system. SOLUTION: An input signal M being a single monaural signal as a sound source signal is fed to a Hilbert transformation circuit HC. The Hilbert transformation circuit HC provides outputs of left and right output signals L", R" whose phase difference is 90 deg.. A prestage processing circuit of this system is equal to that of a conventional 3D monaural/stereo system. Then the left and right output signals L", R" are given to an SRS(Sound Retrieval System) 3D stereo system circuit consisting of a sum and difference generating circuit SD, a high low frequency band emphasis filter FR and a mixer MX or the like, from which left right 3D monaural/stereo output signals L', R'. |
