| 摘要 |
<p>A frequency response compensation system incorporating conventional and unconventional cascaded equalization circuits, in which the frequency response aberrations of a planar diaphragm loudspeaker mounted in an architectural ceiling, wall, or in other enclosure having a limited depth dimension are optimally corrected. A multi-section switch is comprised in a resonant circuit to enable single-control selection of pre-set amplitude (A), frequency (F) and bandwidth (Q) parameters corresponding to various enclosure depths. A low-frequency underdamped high-pass filter and a low-frequency response shaping circuit may each be included in the system to compensate for a low-frequency roll-off resulting from the limited depth dimension of the enclosure. A high-frequency equalization circuit, in which high-pass filtered and non-filtered signals are summed, introduces a rapid rate-of-change shelved equalization required to compensate for a rapid high-frequency response roll-off resulting from the application of decorative finishing materials to the planar loudspeaker diaphragm. A stereophonic spatialization circuit may also be included and utilizes modified stereophonic signal cross-coupling to compensate for the reduced levels of room reverberant sound information associated with in-wall planar loudspeakers. <IMAGE></p> |
