AUDIO/VIDEO SYSTEM AND METHOD ENABLING A USER TO SELECT DIFFERENT VIEWS AND SOUNDS ASSOCIATED WITH AN EVENT

Abstract: A video/audio system includes an interface device (28) that receives a plurality of audio and video signals from a plurality of sources (35, 25, 22). The interface device combines these signals into various combinations and transmits the combinations to a receiver (75). The receiver is configured to interface one of the combinations of signals with a user. In this regard, the receiver (75) allows the user to select one of the combinations, and in response, the receiver separates the video signal(s) of the selected combination from the audio signal(s) of the selected combination. Then, the receiver (75) renders the video signal(s) via a display device and produces a sound defined by the audio signal(s) via a speaker. Accordingly, the user is able to control which set of audio and video signals are interfaced with the user.

Description: VIDEO/AUDIO SYSTEM AND METHOD ENABLING A USER TO SELECT DIFFERENT VIEWS AND SOUNDS ASSOCIATED WITH AN EVENT CROSS REFERENCE TO RELATED APPLICATION This document is related to and claims priority to the following copending non-provisional U.S. patent applications: ( 1 ) "Video/ Audio System and Method Enabling a User to Select Different Views and Sounds Associated with an Event. " assigned serial number 09/322.41 1. and filed Mav 28. 1999: and (2) "Audio/Video System and Method Utilizing a Head Mounted apparatus With Noise Attenuation " , assigned serial number 09/386.613. and filed August 31. 1999. This document is also related to and claims priority to the following copending U.S. provisional applications: ( 1 ) "Audio/Video Signal Distribution System for Head Mounted Displays. " assigned serial number 60/123.341. and filed March 8. 1999: and (2) "Head Mounted Display with Sound Isolation/Hearing Protector Ear Cup. " assigned serial number 60/137.323. and filed June 3. 1999. BACKGROUND OF THE INVENTION FIELD OF THE INVENTION The present invention generally relates to video and audio signal processing techniques and. in particular, to a system and method for receiving video and audio signals from a plurality of sources and for providing a user with multiple combinations of these signals to select from. RELATED ART Audio and video signals are generated from a plurality of sources during many events. For example, at an auto race, television crews usually position cameras at various locations within view of a race track. These cameras generate video signals defining views ofthe race track from various perspectives. In addition, microphones positioned at various locations generate audio signals defining different sounds at the auto race. For example, microphones may be located close to the race track to receive sounds produced by the vehicles participating in the race, and microphones may be located close to television commentators to receive the comments ofthe commentators as they observe and comment on the race. One ofthe video signals and one or more ofthe audio signals are usually selected and combined together at a television station to form a combined video/audio signal. This signal is then modulated and transmitted so that users having a television can receive the combined signal via the television. The television demodulates the combined signal and displays an image defined by the video signal on a display screen and reproduces the sounds defined by the audio signals via speakers. Therefore, the sights and sounds ofthe race can be viewed and heard via the television. In addition, one or more ofthe audio signals, such as audio signals defining the comments of radio commentators, are usually selected and modulated at a radio station to form a radio signal. This radio signal is then transmitted as a wireless signal so that users having radios can receive the signal via a radio. The radio demodulates the signal and reproduces the sounds defined by the radio signal via speakers. However, users viewing and/or hearing the sights and sounds ofthe race via televisions and/or radios are not usually given the opportunity to select which video and/or audio signals are modulated and transmitted to the television and/or radio. Therefore, the user is only able to receive the signals modulated and transmitted to the television and/or radio, even though the user may prefer to receive the other audio and/or video signals that are generated at the auto race. Spectators who actually attend the auto race are usually given more options to view and/or hear the sights and/or sounds of the race from different perspectives. In this regard, a plurality of monitors are usually located at particular locations in the stadium. As used herein, "stadium" shall be defined to mean any non-movable structure having a large number (i.e., thousands) of seats, wherein an event occurs at (i.e., within a close proximity of) the seats such that spectators sitting in the seats can view the event. An "event" is any occurrence viewed by a spectator. Each monitor within the stadium receives one of the aforementioned video signals and displays an image defined by the received video signal to many ofthe spectators. However, the monitor does not always display a desirable perspective with respect to each spectator in the stadium, and the monitor is often not located in an inconvenient location for many ofthe spectators. In this regard, many ofthe spectators often must leave their seats (or other locations) in the stadium and go to a location where the spectators, along with other spectators, can view the monitor displaying the desired perspective. The spectators viewing the monitor often do not have control over which image is displayed by the monitor. Thus a heretofore unaddressed need exists in the industry for providing a system and method that enables a spectator to conveniently view an event from different perspectives. SUMMARY OF THE INVENTION The present invention overcomes the inadequacies and deficiencies ofthe prior art as discussed hereinbefore. Generally, the present invention provides a video/audio system and method for receiving video and audio signals from a plurality of sources and for providing a user with multiple combinations of these signals to select from. The present invention includes an interface device that receives a plurality of audio and video signals from a plurality of sources. The interface device combines these signals into various combinations and transmits the combinations to a receiver. The receiver is configured to interface one ofthe combinations of signals with a user. In this regard, the receiver allows the user to select one ofthe combinations, and in response, the receiver separates the video signal(s) ofthe selected combination from the audio signal(s) ofthe selected combination. Then, the receiver renders the video signal(s) via a display device and produces a sound defined by the audio signal(s) via a speaker. Accordingly, the user is able to control which set of audio and video signals are interfaced with the user. Other features and advantages ofthe present invention will become apparent to one skilled in the art upon examination ofthe following detailed description, when read in conjunction with the accompanying drawings. It is intended that all such features and advantages be included herein within the scope of the present invention and protected by the claims. BRIEF DESCRIPTION OF THE DRAWINGS The invention can be better understood with reference to the following drawings. The elements ofthe drawings are not necessarily to scale relative to each other, emphasis instead being placed upon clearly illustrating the principles ofthe invention. Furthermore, like reference numerals designate corresponding parts throughout the several views. FIG. 1 is a block diagram illustrating a video/audio system in accordance with the present invention. FIG. 2 is a block diagram illustrating a detailed view of an interface device depicted in FIG. 1. FIG. 3 is a block diagram illustrating a detailed view of a receiver depicted in FIG. 1. FIG. 4 is a three dimensional view of a conventional head mounted display. FIG. 5 is a side view illustrating the conventional head mounted display depicted in FIG. 4. FIG. 6 is a three dimensional view of a head mounted display in accordance with the present invention. FIG. 7A is a side view ofthe noise reduction device ofthe head mounted display depicted in FIG. 6. FIG. 7B is a front view ofthe noise reduction device ofthe head mounted display depicted in FIG. 6. FIG. 7C is a bottom view ofthe noise reduction device ofthe head mounted display depicted in FIG. 6. FIG. 8 is a more detailed view ofthe left temple piece ofthe head mounted display depicted in FIG. 6. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The preferred embodiment ofthe present invention will be described hereafter in the context of auto racing applications. However, the scope ofthe present invention should not be so limited, and it should be apparent to one skilled in the art that the principles ofthe present invention may be employed in the context of other applications, particularly in the context of other sporting events (e.g., football games, basketball games, baseball games, hockey matches, etc.). FIG. 1 depicts a video/audio system 20 implementing the principles ofthe present invention. At least one video signal 22 and at least one audio signal 25 are received by an interface device 28. Each ofthe received video signals 22 defines a view ofthe race from a different perspective. For example, the video signals 22 may be generated by different video cameras located at different locations around the stadium, including inside at least some ofthe vehicles participating in the race. Furthermore, each ofthe audio signals 25 defines different sounds associated with the race. For example, at least one ofthe audio signals 25 may be generated from a microphone located close to the track or in one ofthe vehicles such that the audio signal 25 defines noise from the vehicles participating in the race. Alternatively, at least one ofthe audio signals 25 may define the comments of television commentators, and at least one ofthe audio signals 25 may define the comments of radio commentators. Furthermore, at least one ofthe audio signals 25 may define the comments between one ofthe drivers participating in the race and the driver's pit crew. Some ofthe video and audio signals 22 and 25 can be unmodulated when transmitted to the interface device 28 and, therefore, do not need to be demodulated by the system 20. However, some of the video and audio signals 22 and 25 may need to be demodulated by the system 20. For example, at least one of the audio signals 25 defining the comments ofthe radio commentators may be modulated as a radio signal for transmission to radios located at or away from the stadium, and at least one ofthe video signals 25 may be modulated as a television signal for transmission to televisions located at or away from the stadium. In addition, the comments between a driver and the driver's pit crew are usually transmitted via ultra high frequency (UHF) radio waves, which are known to be modulated signals. Therefore, as shown by FIG. 1, the system 20 preferably includes demodulators 32 configured to receive and demodulate the video and/or audio signals 22 and 25. It is possible for some ofthe video and audio signals 22 and 25 to be received from a combined signal 35, which is comprised of at least one video signal 22 combined with at least one audio signal 25. For example, the combined signal 35 may be a television signal modulated for transmission to televisions located at or away from the track stadium. To facilitate the combination of different audio signals 25 with the video signal(s) 22 defined by the combined signal 35, a separator 37 preferably separates the combined signal 35 into its respective video signal 22 and audio signal 25, as shown by FIG. 1. Various configurations ofthe separator 37 may exist without departing from the principles ofthe present invention. FIG. 1 depicts a possible implementation of the separator 37. In this regard, the separator 37 includes an audio signal filter 41 designed to filter out any audio signals 25 from the combined signal 35 and to transmit the resulting video signal(s) 22 to interface device 28. Furthermore, the separator 37 also includes a video signal filter 43 designed to filter out any video signals 22 from the combined signal 35 and to transmit the resulting audio signal(s) 25 to interface device 28. If more than one video signal 22 or more than one audio signal 25 is included in the combined signal 35, then the separator 37 may include additional filters (not shown) to separate the multiple video and/or audio signals 22 and 25 into individual signals before transmitting the signals 22 and 25 to the interface device 28. FIG. 2 depicts a more detailed view ofthe interface device 28. The interface device 28 includes audio combiners 52 configured to receive audio signals 25 and to combine the received audio signals 25 into a single combined audio signal 55. As shown by FIG. 2, each audio combiner 52 preferably receives a different combination of audio signals 25, although it is possible for any one ofthe combined signals 55 to include the same combination of audio signals 25 as any other combined signal 55. Note that when an audio combiner 52 receives only one audio signal 25, the combined signal 55 output by the combiner 52 matches the one signal 25 received by the combiner 52. As an example, one ofthe combined signals 55 may include an audio signal 25 defining comments between a driver and the driver's pit crew and also an audio signal 25 defining sounds (i.e. , vehicular noises) received by a microphone located in the driver's vehicle. Another ofthe combined signals 55 may include the aforementioned audio signals 25 as well as an audio signal 25 defining a radio commentator's comments. Another combined signal 55 may only include an audio signal 25 defining a television commentator's comments. Accordingly, the combined signals 55 preferably define different combinations of sounds. It should be noted that combinations of audio signals 25 other than those described hereinabove are possible. As shown by FIG. 2, each combined signal 55 is transmitted to a respective signal modulator 61. Each signal modulator 61 is also configured to receive a respective one ofthe video signals 25 received by the interface device 28. Each signal modulator 61 is configured to combine the received combined signal 55 and video signal 25 and to modulate the received signals 55 and 25 on a unique frequency range. The signal modulator 61 is then designed to transmit the modulated signal 64, which comprises the combined signal 55 and the video signal 25 received by the signal modulator 61 , to a combiner 67. The combiner 67 is configured to combine each of the modulated signals 64 transmitted from each ofthe signal modulators 61 into a single combined (i.e., multiplexed) signal 71. This combined signal 71 is then transmitted to a plurality of receivers 75. Various techniques exist for transmitting combined signal 71 to receivers 75. For example, a coaxial cable may be used to transmit the combined signal 71 to each ofthe receivers 75. In another example, the system 20 may include a wireless transmitter (not shown) that transmits the combined signal 71 to the receivers 75. Any technique for transmitting the combined signal 71 to the receivers 75 should be suitable for implementing the present invention. A more detailed view of receiver 75 is shown by FIG. 3. Receiver 75 preferably includes a demodulator 82. The demodulator 82 is configured to demodulate the combined signal 71 and to separate (i.e., demultiplex) the combined signal 71 into signals 84 based on frequency, such that each signal 84 respectively corresponds with one ofthe modulated signals 64. In other words, the demodulator 82 recovers the individual signals 64 as signals 84, and each signal 84 is, therefore, defined by the same video and audio signals 22 and 25 that define its corresponding modulated signal 64. Therefore, like modulated signals 64, each signal 84 is preferably comprised of a unique combination of video and audio signals 22 and 25. Signals 84 are transmitted from demodulator 82 to a multiplexer 88, which also receives control signals 92 from a user interface 94. The user interface 94 preferably includes buttons or other types of switches that enable a spectator to select one ofthe signals 84 via control signals 92. In this regard, the multiplexer 88, through techniques well known in the art, selects one ofthe signals 84 based on control signals 92 and outputs the selected signal 84 as output signal 97, as shown by FIG. 3. The receiver 75 includes an audio signal filter 41 configured to filter the audio signal(s) 25 out of signal 97. Therefore, only the video signal(s) 22 within signal 97 are transmitted to a display screen 101, which is configured to render the received video signal(s) 22 (i. e. , display an image defined by the received video signal(s) 22) to the spectator. The receiver 75 also includes a video signal filter 43 configured to filter the video signal(s) 22 out of signal 97. Therefore, only the audio signal(s) 25 within signal 97 are transmitted to a speaker 103, which is configured to produce sounds defined by the received audio signal(s) 25, through techniques well known in the art. In the preferred embodiment, the display screen 101 and speaker 103 are included within a head mounted display (HMD), which is discussed in further detail hereinbelow. By utilizing head mounted displays, the spectator ' s experience may be enhanced. For example, when a head mounted display is used to show an in-car view from a camera located in a driver's car during an auto race, the spectator sees a similar view as the driver ofthe car. Because the head mounted display limits the spectator's peripheral view ofthe environment around him, the user naturally focuses on the view provided by the head mounted display. Therefore, the user may feel almost as if he were riding in the car along with the driver, thereby enhancing the spectator's experience. The head mounted display may similarly enhance a spectator ' s experience at other events, such as other sporting events, for example. Furthermore, when the combined signal 71 is transmitted via a coaxial cable, the receiver 75 may be located at a spectator's stadium seat or other convenient location. When the combined signal 71 is transmitted via a wireless transmitter, the receiver 75 is portable, and a spectator may carry the receiver 75 with him and choose where he would like to view the images and hear the sounds produced by the receiver 75. Accordingly, the spectator may remain in his seat (or other convenient location) and control, by manipulating buttons or other types of switches in the user interface 94, which combination of video and audio signals 22 and 25 are respectively transmitted to display screen 101 and speaker 103. Therefore, the system 20 gives the spectator more flexibility in how the spectator views the race and, as a result, makes the race a more enjoyable experience. It should be noted that video signals 22 and audio signals 25 may be separately transmitted to receiver 75. For example, video signals 22 may be processed and transmitted to receiver 75 via interface device 28 or other type of device, and audio signals 25 may be transmitted to receiver 75 via another device. Through conventional techniques, the receiver 75 may then be configured to select the audio and video signals 25 and 22 to be transmitted to display device 101 and speaker 103. Head Mounted Displays Many different types of head mounted displays may be employed to implement the present invention. Examples of head mounted displays that may be used to implement the present invention are fully described in U.S. Patent No. 5,844,656, entitled "Head Mounted Display with Adjustment Components" and filed on November 7, 1996, by Ronzani et al, and U.S. Patent No. 5,903,395, entitled "Personal Visual Display System," and filed on August 31, 1994, by Rallison et al., which are both incorporated herein by reference. FIGS. 4 and 5 depict a head mounted display (HMD) 151 described by U.S. Patent No. 5,903,395. As depicted in FIG. 4, the HMD 151 includes a main component 152, containing electronics or optics used to provide a visual display to the spectator. The HMD 151 also includes left and right temple pieces 154a and 154b that may be used for assisting and holding the main portion 152 in the desired position to deliver video output to the spectator ' s eyes. A strap 156 can be provided to further assist in holding the apparatus in the desired position with respect to the head 158 ofthe spectator. A forehead brace 161 can be provided to further assist in proper positioning ofthe main portion 152. The forehead brace 161 is useful to transfer some ofthe weight ofthe apparatus to the spectator's forehead. This may provide a more comfortable configuration than having substantially all ofthe weight transferred via other components such as the temple pieces 154a and 154b, headstrap 156 and/or a nose bridge piece (not shown) that may be used in other types of HMDs. As can be seen in FIG. 5, the forehead brace 161 extends back a distance 165 from the main portion 152 ofthe apparatus. As a result, there is an amount of space 166 between the eye position 167 ofthe spectator and the portion 168 ofthe apparatus which resides in front ofthe spectator's eyes sufficient to accommodate the spectator's eyeglasses, e.g., about one inch or more (in one embodiment, about 25 mm). A connection is provided for establishing communication or data transfer to the HMD 151 which, in the depicted embodiment, involves a cable 171 mounted along the underside ofthe left temple piece 154b. As an example, the demodulator 82 (FIG. 3), multiplexer 88, and user interface 94 may be included in a device separate from the HMD 151 shown by FIGS. 4 and 5. The cable 171 may transmit the signals 97 (FIG. 3) to the filters 41 and 43, which are located in the main portion 152. The filtered signals from filters 41 and 43 may be respectively transmitted to display device 101 (FIG. 3) and speaker 103 (FIG. 3) via other cables or other types of connections. As can be seen by FIGS. 4 and 5, speakers 103a and 103b are respectively provided for each ear ofthe spectator. Furthermore, the display device 101 (FIG. 3) is comprised of two liquid crystal displays (LCDs) 175 that receive video signals and produce images based on the received video signals through techniques well known in the art. Each ofthe LCDs 175 is positioned in front of a respective eye ofthe spectator so that each eye of the spectator views an image produced by one ofthe LCDs 175. In the depicted embodiment, a rocker switch 179 can be used to provide control of a parameter which varies through a range, such as the volume ofthe sound produced by the speakers 103a and 103b. Other items that could be controlled in this fashion include, but are not limited to, tint, hue or contrast ofthe video, selection of a video and/or audio source such as channel selection, image brightness, audio tone (i.e., treble/bass control) and the like. A slider switch 181 can be used, e.g., to select among discrete choices. For example, the slider switch 181 may be used to select left, right or no relative frame phasing, to select between stereo and non-stereoscopic views, etc. Other controls and/or indicators can also be used and can be mounted on various surfaces ofthe head-mounted apparatus of FIG. 4. Left speaker 103a is movably attached to the end ofthe temple piece 154a, e.g., by pivotable arm 185a which can be laterally adjusted to a mounting slot 188a in temple piece 154a. The speaker 103a can be held in position by friction or a detent tightener 189 can be used to secure the speaker 103a in the desired position. Right speaker 103b is similarly secured to temple piece 154b. Cables 191a and 191b are respectively used in the HMD 151 of FIG. 4 to provide the desired signals to the speakers 103a and 103b, respectively. The head strap 156 is preferably coupled to the temple pieces 154a and 154b via left and right strap pivots, loops or D-rings 195a and 195b. A length and/or tightness adjustment mechanism such as a buckle, for example, can be provided on the strap 156. At many sporting events (e.g. , auto races, in particular), relatively loud noises are produced. Therefore, it would be difficult for a user to hear the selected audio signals via many conventional head mounted displays, such as the one depicted by FIGS.4 and 5. Accordingly, the inventors have designed a HMD 250 that includes noise reduction devices 252a and 252b to reduce the amount of external noise heard by a spectator, as shown by FIG. 6. Similar to HMD 151 of FIG. 4, HMD 250 includes temple pieces 259a and 259b that are connected to main portion 152. Main portion 152 and temple pieces 259a and 259b form a head mount to which other components ofthe HMD 151 can be coupled. Each noise reduction device 252a and 252b is similarly designed and is respectively coupled to the temple pieces 259a and 259b such that each device 252a and 252b fits over a respective ear of a spectator during use. In this regard, each noise reduction device 252a and 252b forms a cup-shaped shell having a recess 267 (FIGS. 7A-7D). Preferably, a padded cushion 271 , such as the one described in U.S. Patent No. 4,856, 118 entitled "Headphone Cushioning," which is incorporated herein by reference, is positioned at the mouth of each device 252a and 252b as shown by FIGS. 7A-7D so that the noise reduction devices 252a and 252b comfortably engage the spectator' s head during use. When device 252a or 252b is engaged with the spectator' s head, the spectator' s ear fits into the recess 267, and the engaged device 252a or 252b blocks external noises from reaching the ear. Therefore, devices 252a and 252b are similar to the earcup described in U.S. Patent No. 5,023,955, entitled "Impact- Absorbing Sound- Attenuating Earcup," filed on April 13, 1989, by Murphy, II et ah, which is incorporated herein by reference. Similar to U.S. PatentNo. 5,018,599, entitled "Headphone Device," and filed on September 18, 1989, by Masahiro et al., which is incorporated herein by reference, each noise reduction device 252a and 252b is respectively coupled to and houses speakers 103a and 103b. The speakers 103a and 103b are respectively coupled to cables 191a and 191b, and produce sound corresponding to the audio signals transmitted via cables 191a and 191b. Consequently, in use, external noises are attenuated, yet the spectator can clearly hear the selected audio signals produced by the speakers 103 a and 103b. Device 252a will be described in more detail hereafter. However, it should be apparent to one skilled in the art that device 252b includes the same features of device 252a except that device 252b is coupled to temple piece 259b (instead of piece 259a) and is designed to cover the spectator's opposite ear. Referring to FIGS. 7A, 8 A, and 8B, the device 252a preferably includes a member281 having a slot 283 adapted to receive temple piece 259a. The member 281 also includes a hole 286. In operation, the temple piece 259a passes through slot 283, and a securing member 288 (FIG. 9), such as a bolt or a screw for example, passes through the hole 286 and passes through a slot 264 (FIG. 9)in the temple piece 259a. The securing member 288 is preferably secured to the temple piece 259a and the member 281 via any suitable technique. For example, the securing member 288 may be screwed through the member 281 via hole 286,and the securing member 288 may also be screwed through a piece 291 (FIG. 9) located on a side ofthe temple piece 259a opposite ofthe member 281. Therefore, the member 281 is secured to the temple piece 259a via the securing member 288. However, it should be apparent to one skilled in the art that other devices and methodologies may be employed to secure the member 281 to temple piece 259a. As shown by FIG. 10, a ridge 301 is formed on a side ofthe temple piece 259a that engages a wall 299 (FIG. 7 A) of slot 283, when the temple piece 259a is received by slot 283. As shown by FIG. 7 A, a portion ofthe wall 299 of slot 283 includes a series of notches 303 that are each capable of receiving the ridge 301. When the ridge 301 is received by a notch 303, as shown by FIG. 9, any force tending to move the device 252a relative to the temple piece 259a in the x-direction causes the ridge 301 to press against a portion ofthe wall 299 forming the notch 303, until the device 252a is pushed with a force sufficient to deform a flexible portion 311 of temple piece 259a. The flexible portion 311 is positioned adjacent to slot 312 to allow the flexible portion 311 to deform away from the surface 299. Once this occurs, the ridge 301 moves past the notch 303 more easily, allowing the temple piece 259a to move relative to member 281 and, therefore, device 252a. The flexible portion 311 preferably has sufficient elasticity to return to its undeformed state once the ridge 301 moves past the notch 303. Therefore, after moving past the aforementioned notch 303. the ridge 301 should engage a portion of the wall 299 forming another notch 303. Therefore, the user can slide the device 252a in the x-direction along the length ofthe temple piece 259a causing the ridge 301 to be received by different notches 303 until the device 252a is properly positioned relative to the spectator' s head (/. e. , until the spectator' sear is comfortably positioned within the recess 267 ofthe device 252a). Once the spectator stops sliding the device 252a and the ridge 301 is received by one of the notches 303, the position ofthe device 252a relative to the temple piece 259a and, therefore, the spectator's head should remain constant until a force sufficient for deforming the flexible portion is exerted on the HMD 250. As shown by FIG. 6, the device 252a is preferably fastened to an end ofthe strap 156. Therefore, each end ofthe strap 156 is coupled to each ofthe noise reduction devices 252a and 252b. To fasten the devices 252a and 252b to the strap 156, each device 252a and 252b may include a clip, clasp, loop, ring 304 or other type of fastening device. The length ofthe strap 156 can be adjusted via conventional techniques to adjust the size ofthe HMD 250. Therefore, to don the HMD 250, a user places the forehead brace 161 (FIG. 6) against his forehead and positions the strap 156 around the back of his head. The spectator then tightens the strap 156 ( . e. , reduces the length of the strap 156) until the HMD 250 is comfortably held in place. The spectator adjusts the position ofthe devices 252a and 252b by respectively sliding the devices 252a and 252b along the length ofthe temple piece 259a and 259b in the x-direction until the devices 252a and 252b are properly positioned. Then, the spectator can further tighten the strap 156 as desired to further press the forehead brace 161 and the devices 252a and 252b against the spectator's head. In this regard, tightening the strap 156 reduces the circumference ofthe HMD 250 thereby pressing each device 252a and 252b and the forehead brace 161 further against the spectator's head. To a certain degree, as the strap 156 is tightened, external noise is better attenuated, and it is less likely that the HMD 250 will move with respect to the spectator' s head. Accordingly, the spectator can tighten or loosen the strap 156 as desired until the desired fit and desired noise reduction is achieved. It should be noted that it is possible to swap the position of ridge 301 with notches 303. In other words, it is possible to form ridge 301 on a flexible portion of device 252a and to form the grooves 303 in the temple piece 259a without materially affecting the performance or operation ofthe HMD 250. OPERATION The preferred use and operation ofthe video/audio system 20 and associated methodology are described hereafter. Assume for illustrative purposes that a spectator would like to attend an auto race and would like to have access to an in-car view from a camera within his favorite driver's car. In addition, the spectator would also like to continuously hear the dialogue between the aforementioned driver and the driver's pit crew, as well as the comments provided by his favorite radio commentator. It should be apparent that other views and/or sounds may be desirable in other examples. In the past, the spectator would attend the race and acquire (as well as tune) a radio to receive the commentator's comments and a radio to receive the radio signals transmitted between the driver and the driver's pit crew. Then, the spectator would locate a monitor at the stadium displaying the in-car view that he desires to see, assuming that such a monitor is provided. The spectator would then remain within sight ofthe monitor and listen to the two radios. If the monitor is not located in a desirable location for viewing the race, the spectator would have to choose between viewing the monitor and viewing the race at a desirable location. Furthermore, the handling of multiple radios is generally cumbersome and distracting. However, in accordance with the present invention, the user attends the race and is provided a receiver 75 for his individual use. In the preferred embodiment, the receiver 75 is located at the spectator's seat within the stadium. However, the receiver 75 may be located at other convenient locations, and when the combined signal 71 is transmitted via a wireless transmitter, the spectator may carry the receiver 75 around with him to any desirable location in or around the stadium. The receiver preferably includes the HMD 250 depicted by FIG. 6. Therefore, the spectator dons the HMD 250 such that the forehead brace 161 is pressed against his forehead and each noise reduction device 252a and 252b covers one ofthe spectator's ear. Then, the spectator adjusts the length ofthe strap 156 until the HMD 250 properly fits about his head. The spectator then manipulates buttons or other types of switches at user interface 94 to control which signal 84 is output by multiplexer 88 and, therefore, which signals 22 and 25 are transmitted via cable 171 to the HMD 250. Through techniques known in the art, images defined by the video signals transmitted along cable 171 are shown by display device 101 (e.g., LCDs 175), and sounds defined by the audio signals transmitted along cable 171 are produced by speakers 103a and 103b. which are respectively located within devices 252a and 252b. Accordingly, the spectator may use the receiver 75 to see the desired view ofthe race (i.e., the in-car view) and to hear the desired sounds ofthe race (i.e., the dialogue between the driver and the driver ' s pit crew, and the comments from the radio commentator). In this regard, the interface device 28 preferably receives at least a video signal 22 defining the in-car view of his favorite driver and a plurality of audio signals 25 defining the dialogue between his favorite driver and the driver ' s pit crew, as well as the comments from his favorite radio commentator. At least one ofthe audio combiners 52 combines these audio signals 25 into a combined signal 55. One ofthe signal modulators 61 receives this combined signal 55 and the video signal 22 defining the desired in-car view. This video signal 22 is modulated and combined with the foregoing combined signal 55 by one ofthe signal modulators 61 to create a modulated signal 64. This modulated signal 64 is combined with other modulated signals 64 and transmitted to the spectator's receiver 75 via combiner 67. The demodulator 82 in the spectator's receiver 75 demodulates and separates the received signal 71 into separate signals 84. Based on the control signals 92 received from user interface 94, the multiplexer 88 allows only the signal 84 defined by the aforementioned video and audio signals 22 and 25 to pass. Therefore, these video and audio signals 22 and 25 are respectively transmitted to the display device 101 and speakers 103a and 103b and the spectator may enjoy the view and sounds that he selected. It should be noted that it is not necessary for the spectator to keep the receiver 75 within the stadium. In this regard, the signal 71 may be transmitted via satellites and/or communication networks to various locations around the world, and the spectator may select the view and sounds he prefers the most from just about any location capable of receiving signal 71. It should also be noted that the receiver 75 may be retrieved from the spectator after the spectator is finished viewing the event so that the receiver can be provided to another spectator for another event at the stadium. Each spectator is preferably charged a usage fee for the spectator's use ofthe receiver 75. It should be noted that a portion ofthe receiver 75 may be installed at the spectator's seat such that user only needs to retrieve the HMD 151 and/or other components ofthe receiver 75 during the event and return the retrieved components after the event. Furthermore, the entire receiver 75 may be installed at the spectator's seat such that spectator only needs to pay for the use of the receiver. In addition, it may be desirable for one ofthe audio signals 25 to have a higher amplitude than the other audio signals 25. For example, a spectator may desire to hear comments from a radio commentator unless a communication between his favorite driver and the driver's pit crew occurs. When the a communication between the driver and the driver's crew occurs, the spectator would rather listen to this communication instead ofthe radio commentator's comments. Accordingly, one ofthe audio combiners 25 is preferably used to combine a first audio signal 25 defining the radio commentator's comments and a second audio signal defining the communications between the driver and the driver's pit crew preferably increases the amplitude ofthe second audio signal 25 relative to the first audio signal. This may be accomplished by increasing the amplitude ofthe second audio signal 25 with an amplifier or by attenuating the amplitude ofthe first audio signal 25 with an attenuator. Therefore, when the combined signal 55 produced by the aforementioned audio combiner 52 is ultimately received by the spectator's receiver 75, which produces sound based on this combined signal 55, the user hears the radio commentator's comments when there is no communication between the driver and the driver's crew. However, when there is a communication between the driver and the driver's crew, this communication is louder than the radio commentator's comments. Accordingly, the spectator can clearly hear the communications between the driver and the driver's crew even though the spectator's ability to clearly hear the radio commentator's comments is impaired. It should be noted that the foregoing techniques for increasing the amplitude of one audio signal 25 relative to others may be employed for different combinations of audio signals 25 and is not limited to the exemplary combination described above. Furthermore, it should also be noted that the present invention has been described herein in the context of auto racing. However, the system 20 may be useful in other applications as well. The system 20 would be useful in any application where it is desirable for the user to control the types of views and sounds of an event that are presented to the user. For example, the present invention could be particularly useful in any type of sporting event or other type of event attended by a large number of people. It should be emphasized that the above-described embodiments ofthe present invention, particularly, any "preferred" embodiments, are merely possible examples of implementations, merely set forth for a clear understanding ofthe principles ofthe invention. Many variations and modifications may be made to the above-described embodiment(s) ofthe invention without departing substantially from the spirit and principles ofthe invention. All such modifications and variations are intended to be included herein within the scope ofthe present invention and protected by the claims.

Claims: CLAIMS Now, therefore, the following is claimed: 1. A system, comprising: a plurality of audio combiners, each of said audio combiners configured to receive audio signals and to combine said audio signals into a combined signal: a plurality of signal modulators, each of said signal modulators configured to receive a video signal and said combined signal from one of said audio combiners and to combine and modulate said received video signal and combined signal into a modulated signal; and a signal combiner configured to receive modulated signals from said signal modulators and to combine said modulated signals into a multiplexed signal, said signal combiner further configured to transmit said multiplexed signal. 2. The system of claim Error! Bookmark not defined., wherein at least one of said audio signals is combined by each of said audio combiners. 3. The system of claim Error! Bookmark not defined., further comprising: a plurality of receivers, each of said receivers configured to receive said multiplexed signal, to demultiplex said multiplex signal, to receive inputs from a user, to select at least one of said video signals and one of said combined signals based on said inputs, to render said one video signal, and to produce sounds based on said one audio signal. 4. The system of claim Error! Bookmark not defined., wherein said each receiver includes a head mounted display to render said one video signal. 5. The system of claim Error! Bookmark not defined., further comprising: a signal separator configured to receive a combined signal, to separate a first audio signal from said combined signal, to separate a first video signal from said combined signal, to transmit said first audio signal to one of said audio combiners, and to transmit said first video signal to one of said signal modulators. 6. A method, comprising the steps of: receiving a plurality of audio signals; receiving a plurality of video signals; combining said audio and video signals to form a plurality of combined signals, said combined signals defining different combinations of said video and audio signals; combining said combined signals into a single multiplexed signal; transmitting said multiplexed signal; receiving said multiplexed signal; receiving inputs from a user; demultiplexing said multiplexed signal to recover said combined signals; selecting one of said recovered combined signals based on said inputs from said user; rendering at least one video signal included in said one recovered combined signal based on said selecting step; and producing sound defined by at least one audio signal included in said one recovered combined signal based on said selecting step. 7. The method of claim Error! Bookmark not defined., further comprising the step of performing said rendering step via a head mounted display. 8. The method of claim Error! Bookmark not defined., wherein at least one of said audio signals is transmitted from an ultra high frequency (UHF) radio. 9. The method of claim Error! Bookmark not defined., wherein said plurality of audio signals includes a first audio signal defining a sound and a second audio signal defining said sound and wherein said first audio signal is included within one of said combined signals and said second audio signal is included in another one of said combined signals. 10. The method of claim Error! Bookmark not defined., wherein said plurality of video signals includes a first video signal defining an image and a second video signal defining said image and wherein said first video signal is included within one of said combined signals and said second video signal is included in another one of said combined signals. 11. A method of doing business, said method comprising the steps of: providing receivers to users attending an event at a stadium; receiving a plurality of audio signals associated with said event; receiving a plurality of video signals associated with said event; combining said audio and video signals to form a plurality of combined signals, said combined signals defining different combinations of said video and audio signals; transmitting said combined signals to said receivers; and retrieving said receivers from said users. 12. The method of claim Error! Bookmark not defined., wherein each of said combined signals includes at least one of said audio signals and at least one of said video signals. 13. The method of claim Error! Bookmark not defined., wherein said plurality of audio signals includes a first audio signal defining a sound and a second audio signal defining said sound and wherein said first audio signal is included within one of said combined signals and said second audio signal is included in another one of said combined signals. 14. The method of claim Error! Bookmark not defined., wherein said plurality of video signals includes a first video signal defining an image and a second video signal defining said image and wherein said first video signal is included within one of said combined signals and said second video signal is included in another one of said combined signals. 15. The method of claim Error! Bookmark not defined., wherein one of said audio signals is transmitted from a radio station. 16. The method of claim Error! Bookmark not defined., wherein one of said audio signals is transmitted from a ultra high frequency (UHF) radio located at said event. 17. The method of claim Error! Bookmark not defined., wherein said event is a sporting event. 18. The method of claim Error! Bookmark not defined., wherein said event is an auto race. 19. The method of claim Error! Bookmark not defined., further comprising the step of requesting payment from said users. 20. The method of claim Error! Bookmark not defined., wherein each of said receivers includes a head mounted display for rendering said video signals. 21. The method of claim Error! Bookmark not defined., further comprising the steps of: receiving said combined signals at one of said receivers; receiving inputs from one of said users at said one receiver; selecting one of said combined signals based on said inputs; rendering at least one of said video signals defined by said one combined signal to said user; and generating sound based on at least one of said audio signals detmed by saϊ ϊ one combined signal. 22. The method of claim Error! Bookmark not defined., further comprising the steps of: combining said combined signals into a single multiplexed signal; and demultiplexing said multiplexed signal after receiving said multiplexed at said one receiver, wherein said transmitting step includes the step of transmitting said multiplexed signal and said receiving said combined signals step includes the step of receiving said multiplexed signal. AMENDED CLAIMS [received by the International Bureau on 22 August 2000 (22.08.00); original claims 1-22 replaced by amended claims 1-22 (5 pages)] Now, therefore, the following is claimed: 1. A system (20). comprising: a plurality of audio combiners (52). each of said audio combiners (52) configured to receive audio signals and to combine said audio signals into a combined signal: a plurality of signal modulators (61 ). each of said signal modulators (61) configured to receive a video signal and said combined signal from one of said audio combiners (52) and to combine and modulate said received video signal and combined signal into a modulated signal; and a signal combiner (67) configured to receive modulated signals from said signal modulators (61) and to combine said modulated signals into a multiplexed signal, said signal combiner (67) further configured to transmit said multiplexed signal. 2. The system (20) of claim 1. wherein at least one of said audio signals is combined by each of said audio combiners (52). 3. The system (20) of claim 1. further comprising: a plurality of receivers (75). each of said receivers (75) configured to receive said multiplexed signal, to demultiplex said multiplex signal, to receive inputs from a user, to select at least one of said video signals and one of said combined signals based on said inputs, to render said one video signal, and to produce sounds based on said one audio signal. 4. The system (20) of claim 3, wherein said each receiver (75) includes a head mounted display (151) to render said one video signal. 5. The system (20) of claim 3. further comprising: a signal separator configured to receive a combined signal, to separate a first audio signal from said combined signal, to separate a first video signal from said combined signal, to transmit said first audio signal to one of said audio combiners, and to transmit said first video signal to one of said signal modulators. 6. A method, comprising the steps of: receiving a plurality of audio signals; receiving a plurality of video signals; combining said audio and video signals to form a plurality of combined signals, said combined signals defining different combinations of said video and audio signals; combining said combined signals into a single multiplexed signal; transmitting said multiplexed signal; receiving said multiplexed signal; receiving inputs from a user; demultiplexing said multiplexed signal to recover said combined signals; selecting one of said recovered combined signals based on said inputs from said user; rendering at least one video signal included in said one recovered combined signal based on said selecting step; and producing sound defined by at least one audio signal included in said one recovered combined signal based on said selecting step. 7. The method of claim 6, further comprising the step of performing said rendering step via a head mounted display (151). 8. The method of claim 6, wherein at least one of said audio signals is transmitted from an ultra high frequency (UHF) radio. 9. The method of claim 6. wherein said plurality of audio signals includes a first audio signal defining a sound and a second audio signal defining said sound and wherein said first audio signal is included within one of said combined signals and said second audio signal is included in another one of said combined signals. 10. The method of claim 6. wherein said plurality of video signals includes a first video signal defining an image and a second video signal defining said image and wherein said first video signal is included within one of said combined signals and said second video signal is included in another one of said combined signals. 11. A method of doing business, said method comprising the steps of: providing receivers (75) to users attending an event at a stadium; receiving a plurality of audio signals associated with said event; receiving a plurality of video signals associated with said event; combining said audio and video signals to form a plurality of combined signals, said combined signals defining different combinations of said video and audio signals; transmitting said combined signals to said receivers (75); and retrieving said receivers (75) from said users. 12. The method of claim 1 1 , wherein each of said combined signals includes at least one of said audio signals and at least one of said video signals. 13. The method of claim 1 1 , wherein said plurality of audio signals includes a first audio signal defining a sound and a second audio signal defining said sound and wherein said first audio signal is included within one of said combined signals and said second audio signal is included in another one of said combined signals. 14. The method of claim 1 1 , wherein said plurality of video signals includes a first video signal defining an image and a second video signal defining said image and wherein said first video signal is included within one of said combined signals and said second video signal is included in another one of said combined signals. 15. The method of claim 1 1 , wherein one of said audio signals is transmitted from a radio station. 16. The method of claim 11, wherein one of said audio signals is transmitted from a ultra high frequency (UHF) radio located at said event. 17. The method of claim 11 , wherein said event is a sporting event. 18. The method of claim 11, wherein said event is an auto race. 19. The method of claim 11, further comprising the step of requesting payment from said users. 20. The method of claim 11 , wherein each of said receivers includes a head mounted display (151) for rendering said video signals. 21. The method of claim 11 , further comprising the steps of: receiving said combined signals at one of said receivers (75); receiving inputs from one of said users at said one receiver (75); selecting one of said combined signals based on said inputs; rendering at least one of said video signals defined by said one combined signal to said user; and generating sound based on at least one of said audio signals defined by said one combined signal. 22. The method of claim 21. further comprising the steps of: combining said combined signals into a single multiplexed signal; and demultiplexing said multiplexed signal after receiving said multiplexed at said one receiver (75), wherein said transmitting step includes the step of transmitting said multiplexed signal and said receiving said combined signals step includes the step of receiving said multiplexed signal.

Inventors: ANDERSON TAZWELL L JR, WOOD MARK A, ANDERSON, TAZWELL, L., JR., WOOD, MARK, A.
Applicants: IMMERSION ENTERTAINMENT LLC, IMMERSION ENTERTAINMENT, LLC.
Application year: 2000
Main classification: H04R5
IPC codes: H04N5, H04N7, H04R1, H04S1