This disclosure relates generally to sound systems featuring upfiring speakers, and more specifically, to those including a redirecting baffle.
Advances in audio technology have led to the development of home theater sound systems that seek to replicate the experience of watching a movie in a theatre. In such systems, sound is propagated in all three dimensions, with speakers in front of, behind, and overhead of the listener. Home systems have been developed to replicate the theater experience, and some systems include overhead speakers. However, overhead speakers can be unwieldy or unattractive in the home. In certain cases, ceilings are too high to make their use practical.
To simulate the use of overhead speakes, “reflected sound” or “upfiring” speakers have been developed. Upfiring speakers are located at or near ground level and include upfiring drivers, i.e., drivers facing straight up (sometimes referred to as “top firing”) or at an upward facing angle relative to a horizontal plane. In certain cases, the median axis of the speaker driver is perpendicular to the floor and/or the ceiling. However, in other cases the median axis is oriented at an angle that intersects the ceiling at a desired location. In some cases, the upfiring speakers are provided in a “soundbar” which is a lengthwise array of speakers.
The sound from the upfiring speakers reflects off of a desired location on the ceiling and toward the listener, which simulates overhead speakers. However, in some homes the ceilings are prohibitively high to make such reflection practical. Similarly, many retail stores also have very high ceilings, well over twenty feet from the floor. In some cases, the ceiling is not sufficiently reflective to reflect sound to the listener without a degradation in quality. Also, it may be desirable to create surround-sound in outdoor environments where there is no ceiling. As a result, potential buyers cannot hear a demonstration of how the upfiring speakers are intended to be used.
In accordance with a first aspect of the present disclosure, an audio-visual system is provided in an area with a floor and comprises an audio-visual display and a speaker having a median axis oriented at an upward angle of inclination relative to a horizontal plane. The audio-visual display has a top and a bottom spaced apart along a height axis. A redirecting baffle extends above the top surface of the audio-visual display along the height axis and faces downward to receive and redirect soundwaves from the speaker. In certain examples, the median axis is oriented at an upward angle of inclination from about 60 degrees to about 120 degrees relative to the horizontal plane. In the same or other examples, the redirecting baffle is oriented at an upward angle of inclination from about 10 degrees to about 50 degrees relative to the horizontal plane. In the same or other examples, the redirecting baffle is formed from a transparent rigid material, which in certain embodiments, is a transparent acrylic polymer. In certain examples, the speaker is provided as part of a soundbar comprising a linear array of speakers, each having drivers with respective median axes oriented at upward angles relative to the horizontal plane.
In accordance with second aspect of the present disclosure, a sound system is provided which comprises a speaker and a redirecting baffle. The speaker has driver with a median axis oriented upward relative to the horizontal plane, and the redirecting baffle is located above the speaker along a height axis and oriented at an upward angle relative to the horizontal plane to receive soundwaves from the speaker. In the same or other examples, the median axis is oriented at an angle of from about 60° to about 120° relative to the horizontal plane. In the same or other examples, the redirecting baffle is oriented at an upward angle of inclination of no more than 60° relative to the horizontal plane. In accordance with further aspects, the sound system is part of a sound system display and is mounted on a display comprising a base and a vertical panel.
As discussed below, the present disclosure provides sound systems that include one or more upfiring speakers with a sound reflective baffle. The sound systems may be used in indoor or outdoor areas as well as in areas that do not have ceilings (such unenclosed areas outdoors). When referring to such areas herein, the term “floor” will be used. As used herein, the term “floor” refers to the lower surface of an area on which people generally walk and/or on which furniture sits and includes the earth, temporary or permanent surfaces laid on the earth, or elevated surfaces on which people walk (such as an upper story floor). The term “area” may be used to refer to designated locations indoors or outdoors and includes without limitation rooms, warehouses, stores, fields, parking lots, other designated outdoor locations, gymnasiums, and convention centers to name but a few. As used herein, the term “upfiring speaker” refers to a speaker with an upfiring driver. The term “speaker” means one or more drivers in a unitary enclosure. Speakers may include upfiring, front-firing and/or side-firing drivers. The term “driver” means a single electroacoustic transducer that produces sound in response to an electrical audio input signal. Typical speaker drivers include cone, horn, and ribbon transducer speaker drivers. The driver includes a median axis which is a reference axis used to gauge the spatial distribution of sound from the driver. If the median axis points upward (i.e., has a positive angle relative to a horizontal plane such as would be defined by a floor), the speaker is said to be “upfiring.” In a limiting case, the positive angle is ninety degrees relative to the horizontal plane, in which case the upfiring speaker is said to also be “top firing.” One commercially available audio platform that is designed to utilize upfiring speakers is the Dolby Atmos® platform.
Front-firing and side-firing drivers project their sound in different (but sometimes overlapping) directions in the horizontal plane. Their median axes are substantially parallel to the horizontal plane or close enough to parallel that they could not intersect the ceiling of the room in which the speakers are placed.
Referring to
Referring to
Display 22 includes a base 26 and a vertical panel 24. Display 22 has a first end 23a defined by base 26 and a second end 23b defined by vertical panel 24 which are spaced apart from one another along the height h axis. The vertical panel 24 is secured to the base 26 so as to be supported by and oriented perpendicularly to base 26. Vertical panel 24 includes opposing major sides 25a and 25b (not visible in
Base 26 has a lower surface 27a and an upper surface 27b which are spaced apart from one another along the height h axis. Base 26 also has a front surface 27c and a rear surface 27d spaced apart from one another along the depth d axis. The lower surface 27a would typically rest on a floor, a shelf, or a table. In certain examples, the display 22 is positioned so that the base 26 is at or near eye level of customers.
Redirecting baffle 35 is attached to an upper surface 32 of the vertical panel 24. Upper surface 32 of the vertical panel 24 is spaced apart from the soundbar 28 along the height h axis. Redirecting baffle 35 is a rigid panel made of a material that is not acoustically transparent. Redirecting baffle 35 has a downward facing face 36 (i.e., a vector perpendicular to face 36 intersects a horizontal plane (the lxd plane) positioned beneath the redirecting baffle 35 along the height h axis). Redirecting baffle 35 receives soundwaves from the upfiring speaker drivers 29a-29n in soundbar 28 and reflects the soundwaves toward a listener standing in front of display 22, as illustrated in
In certain examples, the redirecting baffle 35 is formed from a rigid polymeric material. In the same or other examples, the rigid polymeric material is an acrylic polymeric material. In the same or other examples, the acrylic material is a poly alkyl acrylate, and preferably, a poly alkyl alkylacrylate, such as polymethylmethacrylate (PMMA). In certain examples, the redirecting baffle 35 is transparent. In the same or other examples, the redirecting baffle has words and/or symbols that may be painted or etched into it which relate to the sound system 21. In one preferred example, redirecting baffle 35 is a transparent, acrylic baffle with words and/or symbols etched into it which describe characteristics of the sound system 21.
As best seen in
The baffle 35 is preferably sized so that the projected distance along the depth d axis from the proximal end 38a to the distal end 38b does not extend beyond the forward surface 27c of the display base 26. In certain examples, the hypotenuse length of the baffle 35 (i.e., the linear distance c from proximal end 38a to distal end 38b along baffle surface when viewing the baffle 35 in a direction parallel to the length l axis as shown in
At a given height of the proximal end 38a of redirecting baffle 35 from the floor 46 along the height h axis, the use of an existing shelfing system 40 allows the height of the vertical panel 24 along the height h axis to be reduced relative to what would be required if the display base 26 sat on the floor. The length of the redirecting baffle 35 along the length l axis is preferably no less than the distance between the outermost drivers 29a and 29n of the baffle 35 and is probably long enough to capture the full distribution of soundwaves from all of the drivers 29a-29n along the length l axis. In a preferred method of use, as shown in
In accordance with a method of use, a sound signal is provided (e.g., from a stereo receiver, mp3 player, etc.) to the sound system 21. Soundwaves from the upfiring drivers 29a-29n of the soundbar 28 are transmitted to and reflected from the redirecting baffle 35 and received by the listener. The soundwaves are reflected from the baffle 35, which is above the listener's head along the height h axis, and thus, simulate the experience of overhead speakers.
In one example, the baffle 35 has words and/or symbols which describe characteristics of the sound system 21, such as company names, trade names, trademarks, electrical specifications, acoustic specifications, prices, warranty terms, etc. In certain preferred examples, the baffle 35 is transparent or translucent and has the words and/or symbols etched into downward facing surface 36.
Sound signals are also concurrently provided to front firing speakers 30a and 30b, thereby giving the listener the experience of having sound come from in front of and overhead of him or her. In a modified example, front firing speakers 30a and 30b or an additional pair of front firing speakers may be positioned behind the listener to provide sound from in front of, overhead of, and behind the listener. In the same or other examples, side baffles angled inwardly toward the listener (i.e., oriented at an angle with respect to planes defined by the height h and depth d axes) may redirect sound from the front firing speakers 30a and 30b. This would allow the listener to receive more sound from the front firing speakers despite standing relatively close to them. The side baffles would preferably comprise materials similar to those of the redirecting baffle 35.
Sound systems with redirecting baffles may also be used with audio-visual systems and attached directly to the audio-visual display, or mounted above the audio-visual display. Such systems are especially desirable in homes or other locations with high ceilings that are not suitable for reflecting sound from upfiring speakers. An example of such an audio-visual system 50 is provided in
Redirecting baffle 64 is similar to redirecting baffle 35. In certain examples, the baffle 62 is transparent. In the same or other examples, baffle 62 comprises a transparent acrylic material. In the same or other examples, the acrylic material is a poly alkyl acrylate, and preferably a poly alkyl alkacrylate such as polymethyl methacrylate (PMMA). The redirecting baffle 64 has a proximal end 66a and a distal end 66b which define the baffle's hypotenuse length c (which is not parallel to the height h axis).
As in the example of
The dimensions of the redirecting baffle 64 are preferably selected to ensure a length along the length l axis that is at least as long as the distance between the end-most upfiring speaker drivers 56a-56n. In certain examples, the hypotenuse length c of the baffle 35 (i.e., the linear distance from proximal end 66a to distal end 66b along baffle surface 65 when viewing the baffle in a direction parallel to the length l axis, as shown in
Front firing speakers 68a and 68b are preferably placed behind the listener and are elevated on stands 69a and 69b. The front firing speakers 68a and 68b are preferably turned toward the listener thereby providing the listener with sound reflected from above his or her head (from soundbar 54) and behind and on both sides of him or her (along the length l axis) from front firing speakers 68a and 68b.
A sound system 20 display is provided as illustrated in