Abstract:
An apparatus for capturing image and sound during interactivity with a computer game in a game environment is provided. The apparatus includes a housing and a base stand for supporting the housing. An image capture device is defined along a front portion of the housing. Also, an array of microphones is defined along the front portion of the housing. The array of microphones is defined by a single microphone positioned on a first lateral side of the image capture device and two or more microphones positioned on a second lateral side of the image capture device opposite the first side. The apparatus also includes a connector for connecting to a computing device.

Description:
CLAIM OF PRIORITY 
     This application claims priority as a continuation of U.S. patent application Ser. No. 12/820,618, entitled “SELECTIVE SOUND SOURCE LISTENING IN CONJUNCTION WITH COMPUTER INTERACTIVE PROCESSING,” filed on Jun. 22, 2010, now U.S. Pat. No. 8,723,984 which is a continuation of U.S. patent application Ser. No. 11/429,133, entitled “SELECTIVE SOUND SOURCE LISTENING IN CONJUNCTION WITH COMPUTER INTERACTIVE PROCESSING,” filed on May 4, 2006, now U.S. Pat. No. 7,760,248 which claims benefit of U.S. Provisional Patent Application No. 60/678,413, entitled “SELECTIVE SOUND SOURCE LISTENING IN CONJUNCTION WITH COMPUTER INTERACTIVE PROCESSING”, filed on May 5, 2005, and U.S. Provisional Patent Application 60/718,145, entitled “AUDIO, VIDEO, SIMULATION, AND USER INTERFACE PARADIGMS”, filed Sep. 15, 2005, all of which are hereby incorporated by reference. 
     U.S. patent application Ser. No. 11/429,133 is a continuation in part (CIP) of U.S. patent application Ser. No. 10/207,677, entitled, “MAN-MACHINE INTERFACE USING A DEFORMABLE DEVICE”, filed on Jul. 27, 2002 now U.S. Pat. No. 7,102,615; U.S. patent application Ser. No. 10/650,409, entitled, “AUDIO INPUT SYSTEM”, filed on Aug. 27, 2003 now U.S. Pat. No. 7,613,310; U.S. patent application Ser. No. 10/663,236, entitled “METHOD AND APPARATUS FOR ADJUSTING A VIEW OF A SCENE BEING DISPLAYED ACCORDING TO TRACKED HEAD MOTION”, filed on Sep. 15, 2003 now U.S. Pat. No. 7,883,415; U.S. patent application Ser. No. 10/759,782, entitled “METHOD AND APPARATUS FOR LIGHT INPUT DEVICE”, filed on Jan. 16, 2004 now U.S. Pat. No. 7,623,115; U.S. patent application Ser. No. 10/820,469, entitled “METHOD AND APPARATUS TO DETECT AND REMOVE AUDIO DISTURBANCES”, filed on Apr. 7, 2004 now U.S. Pat. No. 7,970,147; and U.S. patent application Ser. No. 11/301,673, entitled “METHOD FOR USING RELATIVE HEAD AND HAND POSITIONS TO ENABLE A POINTING INTERFACE VIA CAMERA TRACKING”, filed on Dec. 12, 2005 now U.S. Pat. No. 7,646,372; all of which are hereby incorporated by reference. 
     RELATED APPLICATIONS 
     This application is related to commonly-assigned, co-pending application Ser. No. 11/381,729, to Xiao Dong Mao, entitled ULTRA SMALL MICROPHONE ARRAY, filed the same day as U.S. patent application Ser. No. 11/429,133, the entire disclosures of which are incorporated herein by reference. This application is also related to commonly-assigned, co-pending application Ser. No. 11/381,728, to Xiao Dong Mao, entitled ECHO AND NOISE CANCELLATION, filed the same day as U.S. patent application Ser. No. 11/429,133, the entire disclosures of which are incorporated herein by reference. This application is also related to commonly-assigned, co-pending application Ser. No. 11/381,725, to Xiao Dong Mao, entitled “METHODS AND APPARATUS FOR TARGETED SOUND DETECTION”, filed the same day as U.S. patent application Ser. No. 11/429,133, the entire disclosures of which are incorporated herein by reference. This application is also related to commonly-assigned, co-pending application Ser. No. 11/381,727, to Xiao Dong Mao, entitled “NOISE REMOVAL FOR ELECTRONIC DEVICE WITH FAR FIELD MICROPHONE ON CONSOLE”, filed the same day as the U.S. patent application Ser. No. 11/429,133, the entire disclosures of which are incorporated herein by reference. This application is also related to commonly-assigned, co-pending application Ser. No. 11/381,724, to Xiao Dong Mao, entitled “METHODS AND APPARATUS FOR TARGETED SOUND DETECTION AND CHARACTERIZATION”, filed the same day as U.S. patent application Ser. No. 11/429,133, the entire disclosures of which are incorporated herein by reference. This application is also related to commonly-assigned, co-pending application Ser. No. 11/381,721, to Xiao Dong Mao, entitled “SELECTIVE SOUND SOURCE LISTENING IN CONJUNCTION WITH COMPUTER INTERACTIVE PROCESSING”, filed the same day as U.S. patent application Ser. No. 11/429,133, the entire disclosures of which are incorporated herein by reference. This application is also related to commonly-assigned, co-pending application Ser. No. 11/418,988, to Xiao Dong Mao, entitled “METHODS AND APPARATUSES FOR ADJUSTING A LISTENING AREA FOR CAPTURING SOUNDS”, filed the same day as U.S. patent application Ser. No. 11/429,133, the entire disclosures of which are incorporated herein by reference. This application is also related to commonly-assigned, co-pending application Ser. No. 11/418,989, to Xiao Dong Mao, entitled “METHODS AND APPARATUSES FOR CAPTURING AN AUDIO SIGNAL BASED ON VISUAL IMAGE”, filed the same day as U.S. patent application Ser. No. 11/429,133, the entire disclosures of which are incorporated herein by reference. This application is also related to commonly-assigned, co-pending application Ser. No. 11/429,047, to Xiao Dong Mao, entitled “METHODS AND APPARATUSES FOR CAPTURING AN AUDIO SIGNAL BASED ON A LOCATION OF THE SIGNAL”, filed the same day as U.S. patent application Ser. No. 11/429,133, the entire disclosures of which are incorporated herein by reference. This application is also related to commonly-assigned, co-pending application Ser. No. 11/429,414, to Richard Marks et al., entitled “COMPUTER IMAGE AND AUDIO PROCESSING OF INTENSITY AND INPUT DEVICES FOR INTERFACING WITH A COMPUTER PROGRAM”, filed the same day as U.S. patent application Ser. No. 11/429,133, the entire disclosures of which are incorporated herein by reference. 
    
    
     BACKGROUND 
     Description of the Related Art 
     The video game industry has seen many changes over the years. As computing power has expanded, developers of video games have likewise created game software that takes advantage of these increases in computing power. To this end, video game developers have been coding games that incorporate sophisticated operations and mathematics to produce a very realistic game experience. 
     Example gaming platforms, may be the Sony Playstation or Sony Playstation2 (PS2), each of which is sold in the form of a game console. As is well known, the game console is designed to connect to a monitor (usually a television) and enable user interaction through handheld controllers. The game console is designed with specialized processing hardware, including a CPU, a graphics synthesizer for processing intensive graphics operations, a vector unit for performing geometry transformations, and other glue hardware, firmware, and software. The game console is further designed with an optical disc tray for receiving game compact discs for local play through the game console. Online gaming is also possible, where a user can interactively play against or with other users over the Internet. 
     As game complexity continues to intrigue players, game and hardware manufacturers have continued to innovate to enable additional interactivity. In reality, however, the way in which users interact with a game has not changed dramatically over the years. 
     In view of the foregoing, there is a need for methods and systems that enable more advanced user interactivity with game play. 
     SUMMARY OF THE INVENTION 
     Broadly speaking, the present invention fills these needs by providing an apparatus and method that facilitates interactivity with a computer program. In one embodiment, the computer program is a game program, but without limitation, the apparatus and method can find applicability in any computer environment that may take in sound input to trigger control, input, or enable communication. More specifically, if sound is used to trigger control or input, the embodiments of the present invention will enable filtered input of particular sound sources, and the filtered input is configured to omit or focus away from sound sources that are not of interest. In the video game environment, depending on the sound source selected, the video game can respond with specific responses after processing the sound source of interest, without the distortion or noise of other sounds that may not be of interest. Commonly, a game playing environment will be exposed to many background noises, such as, music, other people, and the movement of objects. Once the sounds that are not of interest are substantially filtered out, the computer program can better respond to the sound of interest. The response can be in any form, such as a command, an initiation of action, a selection, a change in game status or state, the unlocking of features, etc. 
     In one embodiment, an apparatus for capturing image and sound during interactivity with a computer program is provided. The apparatus includes an image capture unit that is configured to capture one or more image frames. Also provided is a sound capture unit. The sound capture unit is configured to identify one or more sound sources. The sound capture unit generates data capable of being analyzed to determine a zone of focus at which to process sound to the substantial exclusion of sounds outside of the zone of focus. In this manner, sound that is captured and processed for the zone of focus is used for interactivity with the computer program. 
     In another embodiment, a method for selective sound source listening during interactivity with a computer program is disclosed. The method includes receiving input from one or more sound sources at two or more sound source capture microphones. Then, the method includes determining delay paths from each of the sound sources and identifying a direction for each of the received inputs of each of the one or more sound sources. The method then includes filtering out sound sources that are not in an identified direction of a zone of focus. The zone of focus is configured to supply the sound source for the interactivity with the computer program. 
     In yet another embodiment, a game system is provided. The game system includes an image-sound capture device that is configured to interface with a computing system that enables execution of an interactive computer game. The image-capture device includes video capture hardware that is capable of being positioned to capture video from a zone of focus. An array of microphones is provided for capturing sound from one or more sound sources. Each sound source is identified and associated with a direction relative to the image-sound capture device. The zone of focus associated with the video capture hardware is configured to be used to identify one of the sound sources at the direction that is in the proximity of the zone of focus. 
     In general, the interactive sound identification and tracking is applicable to the interfacing with any computer program of a any computing device. Once the sound source is identified, the content of the sound source can be further processed to trigger, drive, direct, or control features or objects rendered by a computer program. 
     Other aspects and advantages of the invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention, together with further advantages thereof, may best be understood by reference to the following description taken in conjunction with the accompanying drawings. 
         FIG. 1  shows a game environment in which a video game program may be executed for interactivity with one or more users, in accordance with one embodiment of the present invention. 
         FIG. 2  illustrates a three-dimensional diagram of an example image-sound capture device, in accordance with one embodiment of the present invention. 
         FIGS. 3A and 3B  illustrate the processing of sound paths at different microphones that are designed to receive the input, and logic for outputting the selected sound source, in accordance with one embodiment of the present invention. 
         FIG. 4  illustrates an example computing system interfacing with an image-sound capture device for processing input sound sources, in accordance with one embodiment of the present invention. 
         FIG. 5  illustrates an example where multiple microphones are used to increase the precision of the direction identification of particular sound sources, in accordance with one embodiment of the present invention. 
         FIG. 6  illustrates an example in which sound is identified at a particular spatial volume using microphones in different planes, in accordance with one embodiment of the present invention. 
         FIGS. 7 and 8  illustrates exemplary method operations that may be processed in the identification of sound sources and exclusion of non-focus sound sources, in accordance with one embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     An invention is disclosed for methods and apparatus for facilitating the identification of specific sound sources and filtering out unwanted sound sources when sound is used as an interactive tool with a computer program. 
     In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order not to obscure the present invention. 
       FIG. 1  shows a game environment  100  in which a video game program may be executed for interactivity with one or more users, in accordance with one embodiment of the present invention. As illustrated, player  102  is shown in front of a monitor  108  that includes a display  110 . The monitor  108  is interconnected with a computing system  104 . The computing system can be a standard computer system, a game console or a portable computer system. In a specific example, but not limited to any brand, the game console can be a one manufactured by Sony Computer Entertainment Inc., Microsoft, or any other manufacturer. 
     Computing system  104  is shown interconnected with an image-sound capture device  106 . The image-sound capture device  106  includes a sound capture unit  106   a  and an image capture unit  106   b . The player  102  is shown interactively communicating with a game  FIG. 112  on the display  110 . The video game being executed is one in which input is at least partially provided by the player  102  by way of the image capture unit  106   b , and the sound capture unit  106   a . As illustrated, the player  102  may move his hand so as to select interactive icons  114  on the display  110 . A translucent image of the player  102 ′ is projected on the display  110  once captured by the image capture unit  106   b . Thus, the player  102  knows where to move his hand in order to cause selection of icons or interfacing with the game  FIG. 112 . Techniques for capturing these movements and interactions can vary, but exemplary techniques are described in United Kingdom Applications GB 0304024.3 (PCT/GB2004/000693) and GB 0304022.7 (PCT/GB2004/000703), each filed on Feb. 21, 2003, and each of which is hereby incorporated by reference. 
     In the example shown, the interactive icon  114  is an icon that would allow the player to select “swing” so that the game  FIG. 112  will swing the object being handled. In addition, the player  102  may provide voice commands that can be captured by the sound capture unit  106   a  and then processed by the computing system  104  to provide interactivity with the video game being executed. As shown, the sound source  116   a  is a voice command to “jump!”. The sound source  116   a  will then be captured by the sound capture unit  106   a , and processed by the computing system  104  to then cause the game  FIG. 112  to jump. Voice recognition may be used to enable the identification of the voice commands. Alternatively, the player  102  may be in communication with remote users connected to the internet or network, but who are also directly or partially involved in the interactivity of the game. 
     In accordance with one embodiment of the present invention, the sound capture unit  106   a  is configured to include at least two microphones which will enable the computing system  104  to select sound coming from particular directions. By enabling the computing system  104  to filter out directions which are not central to the game play (or the focus), distracting sounds in the game environment  100  will not interfere with or confuse the game execution when specific commands are being provided by the player  102 . For example, the game player  102  may be tapping his feet and causing a tap noise which is a non-language sound  117 . Such sound may be captured by the sound capture unit  106   a , but then filtered out, as sound coming from the player&#39;s feet  102  is not in the zone of focus for the video game. 
     As will be described below, the zone of focus is preferably identified by the active image area that is the focus point of the image capture unit  106   b . In an alternative manner, the zone of focus can be manually selected from a choice of zones presented to the user after an initialization stage. Continuing with the example of  FIG. 1 , a game observer  103  may be providing a sound source  116   b  which could be distracting to the processing by the computing system during the interactive game play. However, the game observer  103  is not in the active image area of the image capture unit  106   b  and thus, sounds coming from the direction of game observer  103  will be filtered out so that the computing system  104  will not erroneously confuse commands from the sound source  116   b  with the sound sources coming from the player  102 , as sound source  116   a.    
     The image-sound capture device  106  includes an image capture unit  106   b , and the sound capture unit  106   a . The image-sound capture device  106  is preferably capable of digitally capturing image frames and then transferring those image frames to the computing system  104  for further processing. An example of the image capture unit  106   b  is a web camera, which is commonly used when video images are desired to be captured and then transferred digitally to a computing device for subsequent storage or communication over a network, such as the internet. Other types of image capture devices may also work, whether analog or digital, so long as the image data is digitally processed to enable the identification and filtering. In one preferred embodiment, the digital processing to enable the filtering is done in software, after the input data is received. The sound capture unit  106   a  is shown including a pair of microphones (MIC 1  and MIC 2 ). The microphones are standard microphones, which can be integrated into the housing that makes up the image-sound capture device  106 . 
       FIG. 3A  illustrates sound capture units  106   a  when confronted with sound sources  116  from sound A and sound B. As shown, sound A will project its audible sound and will be detected by MIC 1  and MIC 2  along sound paths  201   a  and  201   b . Sound B will be projected toward MIC 1  and MIC 2  over sound paths  202   a  and  202   b . As illustrated, the sound paths for sound A will be of different lengths, thus providing for a relative delay when compared to sound paths  202   a  and  202   b . The sound coming from each of sound A and sound B will then be processed using a standard triangulation algorithm so that direction selection can occur in box  216 , shown in  FIG. 3B . The sound coming from MIC 1  and MIC 2  will each be buffered in buffers  1  and  2  ( 210   a ,  210   b ), and passed through delay lines ( 212   a ,  212   b ). In one embodiment, the buffering and delay process will be controlled by software, although hardware can be custom designed to handle the operations as well. Based on the triangulation, direction selection  216  will trigger identification and selection of one of the sound sources  116 . 
     The sound coming from each of MICs 1  and MICs 2  will be summed in box  214  before being output as the output of the selected source. In this manner, sound coming from directions other than the direction in the active image area will be filtered out so that such sound sources do not distract processing by the computer system  104 , or distract communication with other users that may be interactively playing a video game over a network, or the internet. 
       FIG. 4  illustrates a computing system  250  that may be used in conjunction with the image-sound capture device  106 , in accordance with one embodiment of the present invention. The computing system  250  includes a processor  252 , and memory  256 . A bus  254  will interconnect the processor and the memory  256  with the image-sound capture device  106 . The memory  256  will include at least part of the interactive program  258 , and also include selective sound source listening logic or code  260  for processing the received sound source data. Based on where the zone of focus is identified to be by the image capture unit  106   b , sound sources outside of the zone of focus will be selectively filtered by the selective sound source listening logic  260  being executed (e.g., by the processor and stored at least partially in the memory  256 ). The computing system is shown in its most simplistic form, but emphasis is placed on the fact that any hardware configuration can be used, so long as the hardware can process the instructions to effect the processing of the incoming sound sources and thus enable the selective listening. 
     The computing system  250  is also shown interconnected with the display  110  by way of the bus. In this example, the zone of focus is identified by the image capture unit being focused toward the sound source B. Sound coming from other sound sources, such as sound source A will be substantially filtered out by the selective sound source listening logic  260  when the sound is captured by the sound capture unit  106   a  and transferred to the computing system  250 . 
     In one specific example, a player can be participating in an internet or networked video game competition with another user where each user&#39;s primary audible experience will be by way of speakers. The speakers may be part of the computing system or may be part of the monitor  108 . Suppose, therefore, that the local speakers are what is generating sound source A as shown in  FIG. 4 . In order not to feedback the sound coming out of the local speakers for sound source A to the competing user, the selective sound source listening logic  260  will filter out the sound of sound source A so that the competing user will not be provided with feedback of his or her own sound or voice. By supplying this filtering, it is possible to have interactive communication over a network while interfacing with a video game, while advantageously avoiding destructive feedback during the process. 
       FIG. 5  illustrates an example where the image-sound capture device  106  includes at least four microphones (MIC 1  through MIC 4 ). The sound capture unit  106   a , is therefore capable of triangulation with better granularity to identify the location of sound sources  116  (A and B). That is, by providing an additional microphone, it is possible to more accurately define the location of the sound sources and thus, eliminate and filter out sound sources that are not of interest or can be destructive to game play or interactivity with a computing system. As illustrated in  FIG. 5 , sound source  116  (B) is the sound source of interest as identified by the video capture unit  106   b . Continuing with example of  FIG. 5 ,  FIG. 6  identifies how sound source B is identified to a spatial volume. 
     The spatial volume at which sound source B is located will define the volume of focus  274 . By identifying a volume of focus, it is possible to eliminate or filter out noises that are not within a specific volume (i.e., which are not just in a direction). To facilitate the selection of a volume of focus  274 , the image-sound capture device  106  will preferably include at least four microphones. At least one of the microphones will be in a different plane than three of the microphones. By maintaining one of the microphones in plane  271  and the remainder of the four in plane  270  of the image-sound capture device  106 , it is possible to define a spatial volume. 
     Consequently, noise coming from other people in the vicinity (shown as  276   a  and  276   b ) will be filtered out as they do not lie within the spatial volume defined in the volume focus  274 . Additionally, noise that may be created just outside of the spatial volume, as shown by speaker  276   c , will also be filtered out as it falls outside of the spatial volume. 
       FIG. 7  illustrates a flowchart diagram in accordance with one embodiment of the present invention. The method begins at operation  302  where input is received from one or more sound sources at two or more sound capture microphones. In one example, the two or more sound capture microphones are integrated into the image-sound capture device  106 . Alternatively, the two or more sound capture microphones can be part of a second module/housing that interfaces with the image capture unit  106   b . Alternatively, the sound capture unit  106   a  can include any number of sound capture microphones, and sound capture microphones can be placed in specific locations designed to capture sound from a user that may be interfacing with a computing system. 
     The method moves to operation  304  where a delay path for each of the sound sources is determined. Example delay paths are defined by the sound paths  201  and  202  of  FIG. 3A . As is well known, the delay paths define the time it takes for sound waves to travel from the sound sources to the specific microphones that are situated to capture the sound. Based on the delay it takes sound to travel from the particular sound sources  116 , the microphones can determine what the delay is and approximate location from which the sound is emanating from using a standard triangulation algorithm. 
     The method then continues to operation  306  where a direction for each of the received inputs of the one or more sound sources is identified. That is, the direction from which the sound is originating from the sound sources  116  is identified relative to the location of the image-sound capture device, including the sound capture unit  106   a . Based on the identified directions, sound sources that are not in an identified direction of a zone (or volume) of focus are filtered out in operation  308 . By filtering out the sound sources that are not originating from directions that are in the vicinity of the zone of focus, it is possible to use the sound source not filtered out for interactivity with a computer program, as shown in operation  310 . 
     For instance, the interactive program can be a video game in which the user can interactively communicate with features of the video game, or players that may be opposing the primary player of the video game. The opposing player can either be local or located at a remote location and be in communication with the primary user over a network, such as the internet. In addition, the video game can also be played between a number of users in a group designed to interactively challenge each other&#39;s skills in a particular contest associated with the video game. 
       FIG. 8  illustrates a flowchart diagram in which image-sound capture device operations  320  are illustrated separate from the software executed operations that are performed on the received input in operations  340 . Thus, once the input from the one or more sound sources at the two or more sound capture microphones is received in operation  302 , the method proceeds to operation  304  where in software, the delay path for each of the sound sources is determined. Based on the delay paths, a direction for each of the received inputs is identified for each of the one or more sound sources in operation  306 , as mentioned above. 
     At this point, the method moves to operation  312  where the identified direction that is in proximity of video capture is determined. For instance, video capture will be targeted at an active image area as shown in  FIG. 1 . Thus, the proximity of video capture would be within this active image area (or volume), and any direction associated with a sound source that is within this or in proximity to this, image-active area, will be determined. Based on this determination, the method proceeds to operation  314  where directions (or volumes) that are not in proximity of video capture are filtered out. Accordingly, distractions, noises and other extraneous input that could interfere in video game play of the primary player will be filtered out in the processing that is performed by the software executed during game play. 
     Consequently, the primary user can interact with the video game, interact with other users of the video game that are actively using the video game, or communicate with other users over the network that may be logged into or associated with transactions for the same video game that is of interest. Such video game communication, interactivity and control will thus be uninterrupted by extraneous noises and/or observers that are not intended to be interactively communicating or participating in a particular game or interactive program. 
     It should be appreciated that the embodiments described herein may also apply to on-line gaming applications. That is, the embodiments described above may occur at a server that sends a video signal to multiple users over a distributed network, such as the Internet, to enable players at remote noisy locations to communicate with each other. It should be further appreciated that the embodiments described herein may be implemented through either a hardware or a software implementation. That is, the functional descriptions discussed above may be synthesized to define a microchip having logic configured to perform the functional tasks for each of the modules associated with the noise cancellation scheme. 
     Also, the selective filtering of sound sources can have other applications, such as telephones. In phone use environments, there is usually a primary person (i.e., the caller) desiring to have a conversation with a third party (i.e., the callee). During that communication, however, there may be other people in the vicinity who are either talking or making noise. The phone, being targeted toward the primary user (by the direction of the receiver, for example) can make the sound coming from the primary user&#39;s mouth the zone of focus, and thus enable the selection for listening to only the primary user. This selective listening will therefore enable the substantial filtering out of voices or noises that are not associated with the primary person, and thus, the receiving party will be able to receive a more clear communication from the primary person using the phone. 
     Additional technologies may also include other electronic equipment that can benefit from taking in sound as an input for control or communication. For instance, a user can control settings in an automobile by voice commands, while avoiding other passengers from disrupting the commands. Other applications may include computer controls of applications, such as browsing applications, document preparation, or communications. By enabling this filtering, it is possible to more effectively issue voice or sound commands without interruption by surrounding sounds. As such, any electronic apparatus. 
     Further, the embodiments of the present invention have a wide array of applications, and the scope of the claims should be read to include any such application that can benefit from the such embodiments. 
     For instance, in a similar application, it may be possible to filter out sound sources using sound analysis. If sound analysis is used, it is possible to use as few as one microphone. The sound captured by the single microphone can be digitally analyzed (in software or hardware) to determine which voice or sound is of interest. In some environments, such as gaming, it may be possible for the primary user to record his or her voice once to train the system to identify the particular voice. In this manner, exclusion of other voices or sounds will be facilitated. Consequently, it would not be necessary to identify a direction, as filtering could be done based one sound tones and/or frequencies. 
     All of the advantages mentioned above with respect to sound filtering, when direction and volume are taken into account, are equally applicable. 
     With the above embodiments in mind, it should be understood that the invention may employ various computer-implemented operations involving data stored in computer systems. These operations include operations requiring physical manipulation of physical quantities. Usually, though not necessarily, these quantities take the form of electrical or magnetic signals capable of being stored, transferred, combined, compared, and otherwise manipulated. Further, the manipulations performed are often referred to in terms, such as producing, identifying, determining, or comparing. 
     The above described invention may be practiced with other computer system configurations including hand-held devices, microprocessor systems, microprocessor-based or programmable consumer electronics, minicomputers, mainframe computers and the like. The invention may also be practiced in distributing computing environments where tasks are performed by remote processing devices that are linked through a communications network. 
     The invention can also be embodied as computer readable code on a computer readable medium. The computer readable medium is any data storage device that can store data which can be thereafter read by a computer system, including an electromagnetic wave carrier. Examples of the computer readable medium include hard drives, network attached storage (NAS), read-only memory, random-access memory, CD-ROMs, CD-Rs, CD-RWs, magnetic tapes, and other optical and non-optical data storage devices. The computer readable medium can also be distributed over a network coupled computer system so that the computer readable code is stored and executed in a distributed fashion. 
     Although the foregoing invention has been described in some detail for purposes of clarity of understanding, it will be apparent that certain changes and modifications may be practiced within the scope of the appended claims. Accordingly, the present embodiments are to be considered as illustrative and not restrictive, and the invention is not to be limited to the details given herein, but may be modified within the scope and equivalents of the appended claims.