an ambiophonic headrest is described below . although the invention will be described using examples of one or more preferred embodiments , it is important to understand that these preferred embodiments are used to illustrate the invention and not to limit its scope . fig1 - 3 show the loudspeaker arrangement for dolby ™ digital 5 . 1 , 6 . 1 and 7 . 1 installations respectively . the loudspeakers are positioned on either side of the listening position 102 . the user is sitting in front of the image produced by a television 150 ( or other image projection system ). the subwoofer 104 has no preferred position and is placed to the front left side for illustrative purposes . the installation of a 5 . 1 system shown in fig1 includes a front left loudspeaker 108 , a right front loudspeaker 110 , a center loudspeaker 106 placed at the front , a left side loudspeaker 112 and a right side loudspeaker 114 . installation of a 6 . 1 system shown in fig2 includes the same loudspeakers as those of the 5 . 1 system with the addition of a back loudspeaker 116 . the installation of a 7 . 1 system also includes the same loudspeakers as those of the 5 . 1 system , with the addition of a back left loudspeaker 118 and a back right loudspeaker 120 . as shown in fig4 a , 5 , 6 and 8 , a preferred embodiment of the ambiophonic headrest 200 by preference includes eight loudspeakers , a back right loudspeaker 220 , a back left loudspeaker 218 , a right side loudspeaker 214 , a left side loudspeaker 212 , a front right loudspeaker 210 , a front left loudspeaker 208 , a center right loudspeaker 205 , a center left loudspeaker 207 and a subwoofer 204 . it should be noted that the signal normally intended for the center loudspeaker is split and sent to the center right 205 and left 207 loudspeakers . these center right and left loudspeakers 205 and 207 therefore reproduce the same audio signal . the headrest 200 normally includes a back panel , or central portion , 230 to support the user &# 39 ; s head 202 and to which the right 220 and left 218 back loudspeakers and preferably the subwoofer 204 are fixed to . the headrest 200 includes an extension or right side section 232 and an extension or left side section 234 where the side , front and center loudspeakers are placed . the left 234 and right 232 extensions come out from the sides of the back panel 230 preferably at right angles but it is possible that these extensions can be at an angle smaller or greater than 90 ° from the back panel . the left 234 and right 232 extensions can be mounted on the back panel 230 or can be made as an integral part of the back panel 230 . when a user uses the headrest 200 , he rests its head on the central section 230 . the distance between the right 234 and left 232 extensions is generally arranged to receive the head of a user and leave a space between the head of the user and the internal walls of the left 234 and right 232 extensions ( see fig4 b ). fig4 b and 7 show the preferred arrangement of loudspeakers in the left and right extensions . the loudspeakers are arranged symmetrically on both sides , the arrangement will be explained for one side only for purposes of simplification . as shown in the figures , the loudspeakers placed in the right extension 232 are not all at the same level . in particular , the side right loudspeaker 214 is closer to the back panel 230 , which is lower than the center right loudspeaker 205 and the front right loudspeaker 210 . there is therefore a distance 244 between axes 240 and 242 through the center of the right loudspeakers 214 and the side right loudspeaker 205 and the front right loudspeaker 210 . the distance 244 between the loudspeakers is important to reproduce the effect of depth . as discussed in the description of fig1 to 3 , the back loudspeakers are normally placed behind the listening position . on the headrest , side loudspeakers 212 and 214 are positioned laterally and behind the user &# 39 ; s ears on the inner wall of extensions 232 and 234 . the direction of the sound produced by loudspeakers 212 and 214 is normally parallel to the direction of axes 240 and 242 . the front left loudspeakers 208 and 210 are positioned before the user &# 39 ; s ears . the center right and left loudspeakers 205 and 207 are the same ; they are arranged before the user 202 as in a home theater setup . as already mentioned , the center right and left loudspeakers 205 and 207 , both reproduce the sound usually produced by the center loudspeaker 106 ( see fig1 - 3 ). the back left loudspeakers 218 and 220 are located behind the user , on the back panel 230 . the sound is sent more or less perpendicular to the surface of the back panel 230 . the subwoofer ( or bass and sub - bass loudspeaker ) 204 is placed in the back panel 230 . it should be noted that the subwoofer 204 can be placed in a different position to the one shown , either on the back panel 230 or on the left 234 or right 232 extensions . however , the subwoofer 204 is preferably placed on the back panel 230 so as to be located behind the head of the user 202 . in doing so , the user 202 can feel the vibrations produced by the subwoofer 204 , adding an extra dimension to the listening and / or viewing experience . it should also be noted that subwoofer 204 may be placed more deeply into the back panel 230 than the back loudspeakers 218 and 220 . it should be noted that the loudspeakers can be arranged on a specific angle to change the direction of the sound . the back panel 230 and the right 232 and left 234 extensions are usually made of polymeric foam and are preferably coated with a polymeric or elastomeric membrane so as to contain the sound within the headrest 200 . moreover , the loudspeakers are preferably covered with a grid 270 , shown in fig1 , or some similar form of protection to protect them during use . the ambiophonic headrest 200 in its entirety is preferably covered with a cover covering the back panel 230 and the right 232 and left 234 extensions . the cover is preferably removable and made of a washable material . as shown in fig9 and 10 , the headrest can be provided with additional removable extensions such as the extension 260 mounted behind the central panel 230 between the left 232 and right 234 extensions . extension 260 allows , among other things , better containment of the sound from the loudspeakers . additional extensions such as extension 260 are typically attached to the headrest 200 by velcro ® strips or other means of attachment . the headrest can be suspended for storage or during use , from a wall hook using a strap 280 as shown in fig1 or from an adjustable stand 400 as illustrated in fig1 . strap 280 may also allow the cushion to be fixed to the back of an armchair or a chair . a protective cover 282 attached to the back of the ambiophonic headrest 200 can be used to install it to a chair or armchair . the adjustable support 400 illustrated in fig1 normally includes a base 402 which is fixed to a telescopic support rod 404 . a pivoting arm 408 is mounted to the telescopic support rod 404 by a lockable hinge 406 . arm 408 is provided with a plate 410 ( or other means of support ) at one end , which can support the headrest 200 . in general , back panel 230 is made of a material such as foam to provide comfort to the user when listening to a visual sequence . the material may be fairly rigid or be offered in a variety of hardnesses to meet the needs of different users . the padding can be made of polymeric foam . extensions 232 and 234 may be made of the same material as the back panel if this adequately supports the loudspeakers and maintains the shape of the ambiophonic headrest 200 . the extensions may also be made of a stiffer material to keep the shape of the ambiophonic headrest . although not shown in the figures , the headrest 200 may be improved by the addition of a rigid skeleton where necessary to support the loudspeakers . note that the ambiophonic headrest can be made in many shapes although they have not been illustrated in the present invention . for example , the headrest 300 , shown in fig1 , is egg - shaped . the person skilled in the art would understand that the loudspeakers 204 to 220 are adapted to be connected in a conventional manner , either by wires , or by a wireless interface ( e . g . using a “ bluetooth ” or “ wi - fi ” interface ), to an audio signal source such as an amplifier connected to a dvd player or a digital receiver . moreover , the person skilled in the art would understand that if only some of the loudspeakers are connected to an audio signal source , only some of the loudspeakers will produce sound . for example , if the preferred embodiment of the headrest 200 is connected to a dolby ™ 5 . 1 audio source , the side right 214 and left 212 loudspeakers will produce no sound . finally , the person skilled in the art would understand that the loudspeakers should normally be chosen so that they can be integrated into the back panel 230 and to the extensions 232 and 234 . although it has been described using one or more preferred embodiments , it should be understood that the present invention can be used , employed and / or embodied in a multitude of other forms . therefore , the following claims should be interpreted to include these forms while remaining outside the limits set by prior art .
a headrest provided with several loudspeakers which normally reproduce an ambiophonic sound experience . the headrest generally includes a central section provided with at least one loudspeaker , one side section provided with at least one loudspeaker and a second side section provided with at least one loudspeaker . the side sections are arranged on either side of the center section , and extend substantially perpendicularly towards the top relative to the center section . the headrest is arranged in a way so it can be connected to an audio signal source capable of generating several different audio signals .