| 摘要 |
Recordings from microphones that provide 1 st order Ambisonics signals, so-called B-format signals, offer a limited cognition of sound directivity. Sound sources are perceived broader than they actually are, especially for off-center listening positions, and the sound sources are often located to be coming from the closest speaker positions. In a method and apparatus for enhancing the directivity of 1 st order Ambisonics signals, additional directivity information (22,23) is extracted (SFA) from the lower order Ambisonics input signal (10). The additional directivity information is used to estimate higher order Ambisonics coefficients (25a), which are then combined (CS) with the coefficients of the input signal. Thus, the directivity of the Ambisonics signal is enhanced, which leads to an increased accuracy of spatial source localization when the Ambisonics signal is decoded to loud speaker signals. The resulting output signal has more energy than the input signal. |
