Reflecting sound from acoustically reflective video screen
In an audiovisual system, in which video is displayed on a screen that does not permit sound to pass through the screen, such as a light emitting diode panel, a high-frequency speaker positioned above an audience seating area can direct sound toward the screen, so that the screen can reflect the sound toward the audience seating area. The high-frequency speaker can be used with one or more low-frequency speakers positioned at or near the height of the audience seating area. The low-frequency and high-frequency sounds can appear to originate from close to the same height, thereby creating a realistic audio image at the audience seating area. A spectral filter can negate the spectral effects of propagation to and reflection from the screen. Suitable time delays can synchronize the high-frequency sound with the low-frequency sound and with video displayed on the screen.
1. An audiovisual system, comprising:
a surface viewable from an audience seating area and configured to display video corresponding to a video signal;
a projector configured to receive the video signal and project the video onto at least a portion of the surface; and
an elevatable high-frequency speaker positionable at a first height relative to the audience seating area, the elevatable high-frequency speaker configured to produce a high-frequency sound in response to a high-frequency signal, the high-frequency signal being generated in response to a full-frequency audio signal that is associated with the video signal, the high-frequency signal including frequencies in the full-frequency audio signal that are above a crossover frequency, the elevatable high-frequency speaker configured to direct the high-frequency sound toward at least the portion of the surface, the surface further configured to reflect the high-frequency sound toward the audience seating area.
2. The audiovisual system of claim 1 , wherein the surface includes a wall.
3. The audiovisual system of claim 1 , wherein the crossover frequency is between 200 Hz and 400 Hz, such that human vocals in the full-frequency audio signal are directed into the elevatable high-frequency speaker.
4. The audiovisual system of claim 1 , further comprising:
a controller configured to receive the full-frequency audio signal, and, in response to the full-frequency audio signal, generate the high-frequency signal and generate a low-frequency signal, the low-frequency signal having frequencies below the crossover frequency; and
a low-frequency speaker positioned at or near a height of the audience seating area, the low-frequency speaker configured to produce low-frequency sound in response to the low-frequency signal, the low-frequency speaker configured to direct the low-frequency sound directly at the audience seating area.
5. An audiovisual system, comprising:
a transparent surface viewable from an audience seating area and configured to allow viewing of video corresponding to a video signal through the transparent surface from the audience seating area; and
an elevatable high-frequency speaker positionable at a first height relative to the audience seating area, the elevatable high-frequency speaker configured to produce a high-frequency sound in response to a high-frequency signal, the high-frequency signal being generated in response to a full-frequency audio signal that is associated with the video signal, the high-frequency signal including frequencies in the full-frequency audio signal that are above a crossover frequency, the elevatable high-frequency speaker configured to direct the high-frequency sound at the transparent surface, the transparent surface further configured to reflect the high-frequency sound toward the audience seating area.
6. The audiovisual system of claim 5 , wherein the transparent surface includes a window.
7. The audiovisual system of claim 5 , wherein the crossover frequency is between 200 Hz and 400 Hz, such that human vocals in the full-frequency audio signal are directed into the elevatable high-frequency speaker.
8. The audiovisual system of claim 5 , further comprising:
a controller configured to receive the full-frequency audio signal, and, in response to the full-frequency audio signal, generate the high-frequency signal and generate a low-frequency signal, the low-frequency signal having frequencies below the crossover frequency; and
a low-frequency speaker positioned at or near a height of the audience seating area, the low-frequency speaker configured to produce low-frequency sound in response to the low-frequency signal, the low-frequency speaker configured to direct the low-frequency sound directly at the audience seating area.
9. An audiovisual system, comprising:
a transparent surface viewable from an audience seating area and configured to allow viewing of a static image through a portion of the transparent surface from the audience seating area; and
an elevatable high-frequency speaker positionable at a first height relative to the audience seating area, the elevatable high-frequency speaker configured to produce a high-frequency sound in response to a high-frequency signal, the high-frequency signal being generated in response to a full-frequency audio signal that is associated with the static image, the high-frequency signal including frequencies in the full-frequency audio signal that are above a crossover frequency, the elevatable high-frequency speaker configured to direct the high-frequency sound toward at least the portion of the transparent surface, the transparent surface further configured to reflect the high-frequency sound toward the audience seating area.
10. The audiovisual system of claim 9 , wherein the crossover frequency is between 200 Hz and 400 Hz, such that human vocals in the full-frequency audio signal are directed into the elevatable high-frequency speaker.
11. The audiovisual system of claim 9 , further comprising a controller configured to receive the full-frequency audio signal, and, in response to the full-frequency audio signal, generate the high-frequency signal.
12. The audiovisual system of claim 11 , wherein the controller is further configured to generate a low-frequency signal in response to the full-frequency audio signal, the low-frequency signal having frequencies below the crossover frequency; and
further comprising a low-frequency speaker positioned at or near a height of the audience seating area, the low-frequency speaker configured to produce low-frequency sound in response to the low-frequency signal, the low-frequency speaker configured to direct the low-frequency sound directly at the audience seating area.
13. An audiovisual system, comprising:
a surface including a static image that is viewable from an audience seating area; and
an elevatable high-frequency speaker positionable at a first height relative to the audience seating area, the elevatable high-frequency speaker configured to produce a high-frequency sound in response to a high-frequency signal, the high-frequency signal being generated in response to a full-frequency audio signal that is associated with the static image, the high-frequency signal including frequencies in the full-frequency audio signal that are above a crossover frequency, the elevatable high-frequency speaker configured to direct the high-frequency sound at the static image of the surface, the surface further configured to reflect the high-frequency sound toward the audience seating area.
14. The audiovisual system of claim 13 , wherein the crossover frequency is between 200 Hz and 400 Hz, such that human vocals in the full-frequency audio signal are directed into the elevatable high-frequency speaker.
15. The audiovisual system of claim 13 , further comprising a controller configured to receive the full-frequency audio signal, and, in response to the full-frequency audio signal, generate the high-frequency signal.
16. The audiovisual system of claim 15 , wherein the controller is further configured to generate a low-frequency signal in response to the full-frequency audio signal, the low-frequency signal having frequencies below the crossover frequency; and
further comprising a low-frequency speaker positioned at or near a height of the audience seating area, the low-frequency speaker configured to produce low-frequency sound in response to the low-frequency signal, the low-frequency speaker configured to direct the low-frequency sound directly at the audience seating area.