Abstract:
The present invention includes a mobile device that is capable of storing media and optionally a wireless network connection for streaming live data between the device and the database. The data from the orientation sensor and the position sensor both go directly into the mobile device as input to a controller in the device. The controller controls in part an audio/video output that is modulated based upon the relative position of the user to an object of interest as well as the user&#39;s orientation.

Description:
RELATED APPLICATION 
   This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60/630,064 filed Nov. 22, 2004, which is incorporated herein by reference in its entirety. 

   BACKGROUND OF THE PRESENT INVENTION 
   1. Field of the Invention 
   The present invention relates generally to the art of providing environmental information. More particularly, the present invention relates to the field of mobile information systems that can electronically provide environmental information to a user. 
   2. History of the Prior Art 
   Location based content is quickly becoming a reality as many people are using mobile electronic devices as a means of gathering information while moving through places in the world, often places with which they may be unfamiliar. Like other forms of data or media content, users of location based systems will also find that in certain situations they will also enjoy to have richer more immersive experiences of the place or the content. Location based media will become much more exciting and interesting as new techniques are developed for making the media richer, interactive and immersive. 
   There is a need in the art for an improved system for creating augmented reality environments or environments enriched with location-based content. There is a further need in the art for a system for navigating such environments through the combination of the user&#39;s location, the direction that the user is looking and any other user input by which a correlation may be made between the view the user is seeing and data associated with that view. Such a system would most preferably communicate both visual and aural data to the user, although in some embodiments it is not necessary to communicate both forms of data, and either aural or visual data may be sufficient depending upon the implementation. 
   SUMMARY OF THE PRESENT INVENTION 
   The system and device of the present invention includes at least one orientation sensor and a location sensor that are operatively coupled to a mobile device. The mobile device is operatively connected to a database which, in at least a first embodiment, contains information relating to an object or area of interest to the user. For example, the database may include information concerning geographic, historical and other information concerning a location being visited by the user. The orientation sensor may be a digital compass, magnetometer, gyro, or other device capable of distinguishing a reference direction from a standard direction, such as magnetic north. The position sensor can be any object tracking system or technique that can determine a position with reference to longitude, latitude and, in some embodiments, elevation, and may for example be a global positioning system (GPS), or a system for radio frequency triangulation such as that used for determining the position of a mobile telephone, or any other suitable object tracking technique. 
   The system includes a mobile device that is capable of outputting media and, in at least some embodiments, is capable of storing media. In some embodiments, the mobile device includes a wireless network connection for streaming live data between the device and the database, although in some devices the database may be incorporated in whole or in part in the mobile device. The mobile device includes a controller for dynamically selecting data appropriate to the user&#39;s orientation, and outputting that data in an appropriate form for utilization by the user. Position and orientation information from the orientation sensor and the position sensor both go directly into the mobile device as inputs to the controller. The communication between sensors and device can take any suitable form which allows the controller to provide to the user appropriate data for an enriched appreciation of the location or object being viewed by the user. The connection between the mobile device and the remainder of the system, or between any other system component and the rest of the system, can be wired or wireless; and the data can be transmitted through any protocol available on wired or wireless networks. 
   The system further comprises an audio output that is connected to the controller for providing an audio signal to a user, for example through a pair of headphones. In at least some embodiments, the headphones provide a platform for and are connected to the orientation sensor and the position sensor so that these sensors can accurately detect user position and provide that information to the controller for determining the orientation of the user&#39;s head and, thus, the user&#39;s eyes and ears. While only one orientation is used in some embodiments, a plurality of sensors can be used to detect pitch and yaw data as well as rotational data, and thus provide a richer experience to the user. The controller is then adapted to adjust the audio output to the user based upon the direction in which the user is oriented. As such, the user is treated to a directional theatre experience that can provide video or audio data, or both, from the database in a unique and innovative virtual soundscape. Further details and embodiments of the present invention are described in detail below with reference to the following drawings. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a schematic view of a first implementation of the system and device of the present invention. 
       FIG. 2  is a schematic view of an alternative embodiment of the system and device of the present invention. 
       FIG. 3  is a graphical representation of the directional theatre feature of the present invention. 
       FIG. 4  is a schematic view of the operation of the system of the present invention as it relates to the orientation sensor and the directional theatre feature. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Referring now to  FIGS. 1 and 2 , the preferred embodiments of the present invention are now described in detail. Shown in  FIG. 1 , the system  10  of the present invention includes a client device  12  including a mobile device  16  and an audio output  20 . The mobile device  16  includes a controller  18  for receiving, processing and outputting data, and the audio output  20 , which may be connected to the mobile device  16  by any suitable wired or wireless connection, includes one or more orientation sensors  22  and at least a pair of speakers  24 , which may, for example, be headphones of the type known in the art. In at least some embodiments, it is desirable to use a plurality of orientation sensors to determine not only the rotational position of the user&#39;s head, but also pitch and yaw information. 
   The system  10  also includes a database  14  and associated logic as needed to determine a user&#39;s position  26 , such as a position sensor or triangulation software based upon the wireless connection between the database  14  and the mobile device  16 , or a look-up table or other technique for using data received from the device itself to determine location. The database  14  also includes means for providing streaming media  28  across the wireless connection to the mobile device  16 . 
   In a second embodiment, shown in  FIG. 2 , the database  26  is directly coupled to the mobile device  16 , as is the position sensor  24 . In this embodiment, the position sensor  24  may be a global positioning sensor (GPS) that is in communication with a global positioning satellite or satellite network  30 . The mobile device  16  is coupled to the output  20 , which may comprise either a video display or an audio output, or both depending upon the implementation. The output  20  typically includes the orientation sensor  22  and the speakers  24 , which again may be of the headphone variety in at least some audio embodiments, although other implementations may be implemented to provide a customized listening space, such as transducers integrated into clothing or otherwise wearable, chairs having speakers therein, or even a viewing or listening room. For those embodiments which include a video output, a display may be included in glasses worn by the user, or a head-up display may be implemented, or any other suitable video output which permits the user the desired mobility. 
   The mobile device  16  further includes a controller  18  for processing data from the position sensor  24  and the orientation sensor  22 , retrieving data from the database  26 , and providing an output signal to the speakers  24  according to predetermined spatial relationships. The controller  18  is adapted to operate as a standalone application program, or can be a file or combination of files that a “player” software reads and plays for the user so that the mobile device  16  device and controller  18  can be used to play any content which has been authored for the system  10  by any number of software vendors. 
   In operation, the data taken from the orientation sensor  22  in combination with the data from the location sensor  24  can be used to navigate virtual location-based content that can be explored by, for example, walking in the real (physical) world. The system  10  can use this data, for example, to create a three-dimensional sound space or directional theatre that is able to map a landscape of sound onto the real world, where the sound may be artificial or a reproduction of sounds naturally associated with the area. 
   For the creation of a 3-dimensional “soundscape”, or audio-landscape of 3-D positioned sounds, the data required is the user&#39;s location and orientation, and the location of the sound in the “virtual” space. The mobile device  16  takes the input from the orientation sensor  22  and applies this data to a formula that manipulates the audio outputs that it is sending to the speakers  24 . 
   The directional theatre is created by manipulating the relative amplitude of the left and right speaker sounds based upon any suitable algorithm. For example, the relationship between the virtual source of the sound and the first direction in which the user is oriented may be represented by a simple trigonometric. Thus, if the original normalized volume of a sound is A and the angle of the sound relative to the user is θ, then:
 
 A   r =−sin(θ)+ d , and  (1)
 
 A   i =cos(θ+(π/2))+ d ,  (2)
 
Equations 1 and 2 are graphically shown in  FIG. 3 . It will be appreciated that many other algorithms exist for manipulating the relative amplitudes of the audio output, and the present invention is not limited to a particular method.
 
   Referring now to  FIG. 4 , and using the trigonometric relationship discussed above simply for purposes of clarity of illustration, the interface between the system  10  of the present invention and the directional theatre is shown schematically. A user U is shown at a distance d from an object O from which the virtual sounds are deemed to emit. Data from the position sensor  22  determines the distance d, which affects the absolute amplitude of the sounds emitted by the speakers  24 . The orientation sensor  22  determines the direction D in which the user U is facing, and the controller  18  can thus determine the angle θ. 
   As previously noted, the relative volume emitted by the object will, for the example given herein, depend upon the trigonometric relationships between the user and the object. For an angle of zero, we would expect relative amplitude of the volume in the right and left speakers to be equal, as shown in  FIG. 3 . As the user turns to his right, say at a 45 degree angle, then we would expect the relative amplitude of the volume to increase in the left ear and decrease in the right ear. If the user completes a turn to a full 90 degrees, then we would expect that there would be no volume in the right ear and the full amplitude of volume in the left ear, as shown in  FIG. 3 . Of course, those skilled in the art will appreciate that the dispersion of sound may vary with more than just a trigonometric relationship, and thus it may be desirable to implement more complex algorithms to improve the “naturalness” of the audio output  20 , or to apply a first algorithm to one kind of sound (for example, a foreground sound) but another algorithm to a different type of sound (e.g., a background sound). In addition, although the present example discusses an audio output in detail, it will be appreciated that substantially these same considerations apply to a video output, and that the description of an audio output is used for exemplary purposes only and is not intended to be limiting. 
   In order to create the directional theatre, the system  10  of the present invention compiles the location of the person in the real world as they are moving, the direction that person is facing, and the ‘virtual’ location of the sound. The first variable is derived from the position sensor  24 . The second variable is derived from the orientation sensor  22 . The virtual location of the sound is predetermined and established within the database  14 , which can be internal or external to the mobile device  16 . Lastly, the system  10  preferably will permit the system to independently control the volume of the sounds going to the speakers  24  of the headphones that the person is wearing or other listening environment. 
   It should be apparent to those skilled in the art that the foregoing discussion is merely an illustration of the preferred embodiments of the present invention, and that many other useful and equivalent modifications and substitutions may be made without deviating from the scope and purpose of the present invention as set forth in the following claims.