Patent Publication Number: US-2007121958-A1

Title: Methods and apparatuses for recording and playing back audio signals

Description:
CROSS REFERENCE TO RELATED APPLICATIONS  
      This patent application is a continuation of U.S. patent application Ser. No. 11/219,514, filed Sep. 2, 2005, which is a nonprovisional of U.S. Patent Provisional Application No. 60/658,635, filed Mar. 3, 2005. All of these prior applications are hereby incorporated by reference herein in their entireties. 
    
    
     BACKGROUND OF THE INVENTION  
      This invention relates to multi-media recording, processing and playback of audio signals. More particularly, this invention relates to reproducing stored audio signals in a manner such that the reproduced signals sound as if the stored audio signals had been recorded in a particular acoustic environment.  
      An acoustic environment is the culmination of anything that may affect the production, propagation or reverberation of an audio signal. More particularly, the acoustic environment is how sound waves interact with the surroundings.  
      Audio signal recording, processing and playback techniques have traditionally been utilized to capture and playback sound. Audio signal recording techniques involve creating both representative and storage signals, which may be of different domains (e.g., mechanical, optical, electrical, etc.) than the original analog sound signals. For example, the audio signals may be converted into representative signals of electrical pulses, which may then be converted into storage signals such as the physical grooves in a vinyl record or the optical grooves in a compact disc (CD). The translation from the audio domain to a storage domain usually requires that the audio signals are processed by various audio, mechanical and/or electrical equipment (e.g., such as a microphone, audio mixer, digitizer, CD burner, etc.).  
      In some instances, a microphone or other transducer may be used to convert the audio signals into representative signals. The representative signals may be further processed by a sound mixer and/or stored by a CD burner to a CD. The stored signals may be further processed and/or played back from the stored form.  
      Audio, representative and storage signals are often processed by various types of equipment. The processing of the signals may result in improvements in the fidelity and accuracy of the sound compared to how the audio signals originally sounded. Current sound processing techniques, however, do not permit an audio signal recorded in one acoustic environment to be played back to sound as if it was originally recorded in one or more user-selectable other acoustic environments.  
      High quality sound stereo systems enable a user to experience the finest quality of sound from the comfort of their home. However, even the most advanced or expensive sound systems do not currently allow users to experience audio performances that sound, for example, “live,” unless the original recording was a “live” recording (versus a studio recording). This is because even the most advanced and expensive systems are limited to playing back the audio signals that were recorded with minor, uncoordinated modifications (such as adjusting bass or treble).  
      For example, a person might have a recording of the songs from  The Phantom of the Opera  on CD or own a copy of  The Phantom of the Opera  on DVD (theatrically released in December of 2004). The audio of the CD or DVD will likely not sound the same in a user&#39;s home as the songs sounded when they are performed live in the Majestic Theater in New York City. One of the reasons for this is because sounds on CDs and DVDs are generally recorded in a recording studio (or other acoustically controlled environment). Each time a listener wants to hear how  The Phantom of the Opera  sounds live, the listener must purchase a ticket and attend a performance, regardless of their current home entertainment system (unless a “live” recording was made in the Majestic Theater).  
      Some home entertainment systems may provide a user with a more advanced ability to alter the audio signals, such as surround sound or through an equalizer, but even this added capability does not permit a user to hear the sound as it would have been influenced by the acoustic environment during a “live” performance.  
      Moreover, even “live” performances may not necessarily sound “live” when played back from a CD or DVD. This is because even when audio signals are recorded live (i.e., not in a recording studio) the signals are generally captured at the source of audio signals (e.g., near a speaker placed directly in front of the performer), which may prevent the audio signals from being affected by the acoustic environment of the venue.  
      In addition, even when the audio signals are allowed to be influenced by the acoustics of a venue, the audio signals recorded are still limited to the acoustic environment of the location of the sound capturing device (e.g., microphone). For example, a live recording of the Broadway Musical  The Phantom of the Opera  in the Majestic Theater may differ depending where the recording transducer is located. When the recording apparatus is located in the balcony, the recorded audio signals will likely be influenced by a different acoustic environment than if the recording apparatus is located center stage. The prior art simply does not account for these differences in acoustic environments.  
      Another deficiency with known recordings of audio signals is the requirement that the origin of the audio signal or signals has to be present in the acoustic environment with the sound capturing device to capture how that acoustic environment influences the sound. For example, if the late Johnny Cash never performed in the Majestic Theater, then it would be impossible to hear a Johnny Cash recording played back as it would have sounded “live” at the Majestic Theater.  
      Along those same lines, if somebody always wanted to hear what they would sound like singing the National Anthem at Yankee Stadium, they would have had to have a recording made of them actually singing at Yankee Stadium. The user is unable to select different audio signals to be altered by user selected acoustic environments. These limitations currently exist regardless of the complexity or superiority of a user&#39;s home entertainment system (e.g., surround sound, Dolby digital, quadraphonic, and virtual sound imaging systems, to list a few).  
      In view of the foregoing, it is an object of this invention to provide methods, systems and computer readable media to record, process and playback recreated acoustic signals as though the signals were influenced by one or more acoustic environments.  
     SUMMARY OF THE INVENTION  
      These and other objects of the present invention are accomplished in accordance with the principles of the present invention by providing circuitry that utilizes at least two inputs to produce at least one output. In some embodiments of this invention, an audio signal input and a selected acoustic environment characterization input may be processed together to produce a modified audio output signal that essentially sounds as if it were recorded and/or played back in the acoustic environment represented by the selected acoustic characterization even though such a recording is not readily available.  
      In other embodiments of the present invention, the audio signal input may be one or more audio signals emitted from an audio source or any other signal(s) representing such audio signals (e.g., digital signals stored on a hard drive in MP3 format). The acoustic environment input may be signals that represent the acoustics or acoustical characteristics of a particular acoustic environment (e.g., an actual concert hall, stadium, bar, etc.).  
      In still more embodiments, the present invention may model one or more acoustic environments. The model of the acoustic environment may be used as the acoustic environment input of the present invention.  
      The output signal may, in some embodiments of this invention, be one or more audio signals or other type of signals, which are substantially the same as the signal produced when the audio signal of the first input is acoustically influenced by the acoustic environment of the second input. Any input and/or output signal or signals may be recorded or saved on storage media.  
      The input signals may, in other embodiments of the present invention, be provided by a storage medium, downloaded from a remote location (e.g., via the Internet), and/or provided from a sensor or other apparatus as streaming media. One or more of the input signals may be processed and/or played back by the present invention.  
      It may be desirable, in some embodiments of the present invention, for the output to be a reproduction of audio signals that sound as if the audio signals have been influenced by an acoustic environment.  
      In other embodiments of this invention, the output of the invention may be enhanced to provide an acoustical presence. For example, surround sound systems or other presently available technology may be utilized in connection with the present invention to provide a more realistic reproduction of the effects that an acoustic environment may have on an audio signal. In this manner, the present invention may improve upon existing recording, processing and projection of audio signals.  
      The present invention may reduce the cost of recording live performances. For example, in some embodiment, a performer would no longer need to perform in a venue for their performance to be influenced by the venue&#39;s acoustical environment. In this manner, a live performance may be recreated without the actual performer ever performing in a particular venue.  
      In still other embodiments of the present invention, the performance characteristics of an acoustic environment may be independently productized and distributed over the internet, in retail stores or by other means. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The above and other features of the present invention, its nature and various advantages will be more apparent upon consideration of the following detailed description, taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout, and in which:  
       FIG. 1  is an illustration of one embodiment of a system of recording audio signals in accordance with the principles of the present invention in which the audio signals are recorded, processed and stored;  
       FIG. 2  is an illustration of one embodiment of a system for characterizing an acoustic environment in accordance with the principles of the present invention in which at least one signal representing the characteristics of the acoustic environment may be recorded, analyzed, stored on media and/or provided to the internet;  
       FIG. 3  is an illustration of one embodiment of a playback filtering process in accordance with the principles of the present invention;  
       FIG. 4  is an illustration of one embodiment of a system for filtering the input signals and playing the output signals in accordance with the principles of the present invention;  
       FIG. 5  is an illustration of a distribution and payment process for acoustic characterizations in accordance with the principles of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
       FIG. 1  shows system  100  that includes circuitry that may be used in accordance with the principles of the present invention to create altered audio recordings. System  100 , which is particularly directed at acquiring the audio signals to be altered, includes audio source  102  that emits audio signals in acoustic environment  104 .  
      Audio source  102 , which includes at least one sound emitting body, or object, may also include a collection of sound emitting bodies, instruments, objects and/or devices. For example, audio source  102  may be one or more people producing sound (e.g., singing, talking, stomping their feet, clapping their hands, crying, breathing, etc.), musical instruments, alarms, firearms, audio speakers, electronic devices and/or animals (e.g., dog, dolphin, cat, etc.).  
      Audio source  102  may also be a quiet object that does not usually generate sound (e.g., a door, water, rocks), unless one or more forces are applied to the object (e.g., slamming a door, the ocean crashing on rocks, etc.). For example, a normally quiet tree may make a “creaking” sound when a gentle breeze is present. Fingernails and a chalkboard are examples of objects incapable of emitting sound on their own, yet when fingernails are dragged across a chalkboard a very distinct noise may be emitted.  
      Acoustic environment  104  is any actual place that audio signals may be present and/or influenced. Thus, acoustic environment  104  may be any location in a venue in which performances occur, such as a concert hall, sports stadium, recording studio, etc. Acoustic environment  104  may be more specific, such as a particular seat in a particular venue. Acoustic environment  104  may also be, for example, any room of any structure (e.g., any room in any home, the oval office, the kitchen in a submarine, etc.), a shower (with or without water coming out of the shower head), a local bar or restaurant, etc., or any place in nature (e.g., the beach, the Grand Canyon, the Redwood forest, etc.).  
      In general, audio signals emitted by audio source  102  are influenced by the acoustic properties of environment  104 . This includes the geometry, materials, temperature, spacing and orientation of environment  104 . For example, recorded audio signals produced by source  102  will be effected differently when the walls of acoustic environment  104  are made out of steel versus rubber, even if all other factors are the same. For many audio recordings (e.g., commercially produced musical CDs, movie sound effects, etc.), acoustic environment  104  is often a recording studio designed to minimize the affect of the environment on the sounds emitted by audio source  102 .  
      Capturing device  106  captures audio signals emitted by audio source  102  as influenced (or not) by acoustic environment  104 . Capturing device  106  may include one or more microphones or other transducers that may convert analog audio signals into representative signals of a different domain (e.g., electrical, magnetic, optical, mechanical, etc.). These representative signals are then processed by processor  108 , digitized by digitizer  110 , stored on storage media by recording device  112 , uploaded to Internet  116 , and/or they may be recorded in analog form on magnetic tape (not shown) for later use.  
      Processor  108 , if used, processes the representative signals by, for example, amplifying, filtering, mixing, modifying or otherwise controlling the signals that represent the captured audio signals. Processor  108  may be similar to audio equipment found in the most sophisticated professional recording studios or it may be simple as a basic amplifier. Alternatively, in some embodiments, processor  108  may not be included in system  100 .  
      In some embodiments of the present invention, system  100  also includes digitizer  110  to convert the representative signals captured by capturing device  106  into digital signals (i.e., a series of ones and zeros). The digital signals created by digitizer  110  would then be provided to processor  108  for processing (i.e., additional processing or initial processing depending on whether the signal was processed prior to being digitized).  
      Ultimately, the audio signals produced by audio source  102  are stored by recording device  112  on storage media as recording  114 . This may occur after the signals have been processed and/or digitized, or they may be recorded directly in analog form. For example, recording  114  may be stored on a CD, DVD, memory card, memory stick, USB storage device, magnetic tape, Read Only Memory (ROM), Random Access Memory (RAM), palm pilot, cellular phone, mini disk or any other media that may be used to store audio signals or representative signals. Recording device  112  can support multiple types of storage media as shown in  FIG. 1  and may be able to transmit information wirelessly (e.g., infrared or otherwise) to storage media when creating recording  114 .  
      Capturing device  106 , processor  108 , digitizer  110 , recorder  112  and internet  118  may exchange data and communicate with each other over communications paths such as communications paths  118 ,  120 ,  122  and  124 . Paths  118 ,  120 ,  122  and  124  may be cables or other wired connections, free-space connections (e.g., wireless signals), satellite links, or any other suitable link or combination of links.  
       FIG. 2  shows system  200  that includes circuitry that also may be used in accordance with the principles of the present invention to create altered audio recordings. In particular, system  200  is used to create characterization  214  of acoustic environment  204 . System  200  includes: excitation device  202  (which may be substantially similar to audio source  102  described above), capturing device(s)  206 , recording device  112  (which may be omitted) and analysis system  230 .  
      Acoustic environment  204  refers to any acoustic environment where audio signals may be present or introduced. Acoustic environment  204  may be characterized or defined by one or more sets of equations, algorithms, formulae, data and relationships containing information. For example, reverberation, absorption, reflection, amplification, frequency shift, noise, as well as other parameters as a function of the source, location, atmospheric conditions, listener&#39;s location, etc. may be used to create characterization  214 . Acoustic environment  204  can be anyplace where sound occurs, including but not limited to all of the environments discussed above with respect to environment  104 .  
      In some embodiments of system  200 , a plurality of capturing devices  206  (e.g., microphones) are strategically positioned in environment  204  to increase the resolution of characterization  214 . For example, microphones having desired sensitivity and pickup pattern may be placed at various audience locations in acoustic environment  204  to obtain a representative survey of acoustic environment  204  at common listening locations (e.g., front row center, orchestra center, front row balcony left, etc.).  
      The signals emitted by excitation device  202  are influenced by acoustic environment  204  in the same manner as described above with respect to system  100  of  FIG. 1 . The emitted signals are captured by device  206  which may convert them into representative signals of a different domain, if desired. The captured signals are then provided to recorder  112 , Internet  116  and/or analysis system  230  and/or any other system or device.  
      Analysis system  230  receives signals via communication path  222 , which may be from recording device  112  or Internet  116 . Analysis system  230  utilizes any combination of these inputs to determine how acoustic environment  204  influences the signals emitted from excitation device  202 . For example, analysis system  230  may compare data (e.g., pitch, frequency, timing, amplitude and other characteristics) related to the signals emitted by excitation device  202  to the data received by each of the capturing devices  206 . In this manner, analysis system generates characterization  214  as a representation of how acoustic environment  204  influences sound, and records or stores characterization  214  in the same manner as described above with respect to the storage media used to store recording  114 .  
      In some embodiments of the present invention, the sounds emitted by excitation device  202  could be at least one test audio signal. A test audio signal is a sample of music or other type of signal that enhances how acoustic environment  204  influences a particular type of sound. A test audio signal may be, for example, music recorded on a CD or signals developed for the purpose of being a test audio signal. For example, a test audio signal may be a rock and roll song that tests how acoustic environment  204  influences rock and roll music (i.e., the combination of electric guitar sounds with drum sounds and other popular rock and roll sounds). As another example, the test audio signal or signals may be one or more samples of classical music (e.g., the combination of piano sounds, violin sounds, etc.), country music (e.g., banjo sounds, guitar sounds, harmonica sounds, etc.), jazz music, blues music and/or any other combination of musical tones.  
      As described above, analysis system  230  processes the resultant singles (i.e., the test audio signals and the test audio signals as influenced by acoustic environment  204 ) together to find the similarities between all the signals. Analysis system  230  may then extract those commonalities and use them to generate characterization  214 , which may be directed towards characterizing an acoustic environment for a particular type of music.  
      In some embodiments of the present invention, analysis system  200  may be used to create one or more libraries of characterizations (not shown). A library of characterizations can include one or more characterizations, such as characterization  214 , that are grouped with one or more other characterizations. The library of characterizations may be stored on storage media or be electronically transferred (e.g., via the Internet), such that similar characterizations to be organized together. For example, a library of characterizations may include a plurality of characterizations for different locations of the Majestic Theater (e.g., characterizations for the front row center, orchestra center, front row balcony left, etc.), or it may include a plurality of characterizations for how different types of music are affected by the Majestic Theater (e.g., Opera, Rock, Jazz, Hip-Hop, etc.). Alternatively, a library of characterizations may also be a random assortment of unrelated characterizations, such as different venues, or may be characterizations grouped together by a user or other system.  
      Libraries of characterizations may be licensed and/or sold through conventional sales channels (such as by selling a library stored on CD-ROM in an electronics store, as computer software is often distributed), or they may be downloaded from the Internet, etc. Under these circumstances, some or all of the characterizations associated with the library may be available as a single product.  
      Alternatively, each characterization of the library may also be available as an individual product. In this manner, an entire library may be distributed together, but rights to use particular characterizations of the library can be purchased on an individual basis. For example, a library of characterizations including characterizations of how the Majestic Theater influences different types of music may be distributed as a single product, but users would be limited to accessing only the characterizations they purchased, such as those associated with Opera music. In that case, the remaining characterizations in the library would be locked to prevent unauthorized use.  
      In alternative embodiments of the present invention, characterization  214  may also be created by system  200  using analytical or theoretical characterizations. In this manner, analysis system  230  is used to create characterization  214  without the use of excitation device  202 , capturing device  206 , Internet  116  and/or recorder  112 . In that circumstance, analysis device  230  receives specifications of acoustic environment  204  as inputs from a user or via some form of storage media. For example, the acoustic properties and characteristics (e.g., the acoustic reflection, absorption coefficients, interference properties, spatial dimensions and layouts, temperature settings, etc.) of acoustic environment  204  may be input or selected from a list of choices displayed by analysis system  230 , rather than using excitation source  202  and capturing devices  206  to detect the characterization.  
      In this manner, characterization  214  may be generated analytically without the experimentation characterization described above (or the two methods may be combined to form characterization  214 ). In this manner, acoustic environment  204  need not actually exist or be physically accessible because an acoustic model of an actual venue may be made using actual measurements of the dimensions, layout and other acoustical properties, which may be obtained without physically accessing the acoustic environment  204 . For example, the demolished Three Rivers Stadium that stood in Pittsburg, Pa. could be used as acoustic environment  204 . A characterization of that environment may be generated by analysis system  230  based upon computer assisted drawings (CAD) or other information contained in the blue prints of the stadium (including, for example, the material composition of the seats in the stadium).  
      This application of the present invention could also be applied to create acoustic environments that never existed. In this manner, the acoustical characteristics of a virtual location having ideal acoustical properties, or a location that is impossible or difficult to actually measure may be represented by characterization  214 . Examples of such fantastic, fictional, or imaginary acoustic environments that may be represented by characterization  214  are a jungle on prehistoric earth, a space habitat on Mars, a dormant volcano on Jupiter, a crater on the moon, and settings of books or movies such as the  Lord of the Rings , as well as settings of video games and cartoons.  
       FIG. 3  shows a block diagram of process  300  that may be used in accordance with the principles of the present invention to produce altered audio signals based on a selected environment. Process  300  may be used to alter recording  114  in accordance with a selected characterization  214 . As a result of this process, recording  114  is reproduced and played back to sound as if the audio signals of audio source  102  stored on recording  114  were captured in and/or influenced by acoustic environment  204 . Persons skilled in the art will appreciate that process  300  can alternately be used to remove the influences acoustic environment  104  may have on the signals recorded on recording  114  (so that recording  114  sounds “cleaner,” as if it were made in a recording studio).  
      In steps  302 ,  304  and  306  the acoustic environment (e.g., a venue, stadium, etc.), location in the acoustic environment (e.g., a particular seat or section) and other venue parameters (e.g., height above the seat, temperature, amount of people in the venue, etc.) are selected by the user (if such options are available). In step  308 , the audio data for processing (e.g., a song on a CD) is selected.  
      In steps  310  and  312 , characterization  214  and recording  114  are utilized to condense the data selected in steps  302 ,  304 ,  306  and/or  308 . Steps  310  and  312  would also include any preprocessing necessary so that the characterization and audio signals are compatible and ready for processing. For example, if the audio signals were recorded in analog form on magnetic tape, step  312  would include converting the analog signal to a digital signal (assuming the characterization is digital).  
      In step  314 , the data from step  312  is filtered/processed with the data from step  314  to produce an altered audio signal. The altered audio signal is representative of what the original audio signal would have sounded like if it had been recorded and/or played back in the selected environment (if that option is selected). Alternatively, step  314  may also be used to remove the influences of acoustic environment  104  when one or more other steps (not shown for simplicity, but similar to steps  302 ,  304 ,  306  and  310 ) is included that provides a characterization of acoustic environment  104 , so that the resultant signal is a “clean” version of audio signal  102 .  
      In step  316 , the resultant signal from recording  114  as filtered/processed with respect to characterization  214  is further processed (e.g., amplified, mixed, enhanced, etc.). The processed signal may be stored to a storage device, uploaded to the Internet, and/or played back to the user. This resultant signal may be provided to, for example, any system, apparatus and any other electrical or storage device.  
       FIG. 4  shows system  400  which is an example of a stereo component (e.g., a receiver, etc.) that incorporates circuitry that operates in accordance with the principles of the present invention. System  400  may be utilized to play back recording  114  as it would sound when influenced by the acoustic environment represented by characterization  214 . System  400  may be operated and/or interfaced with other stereo components, systems and electronic device (e.g., as part of a home theater system, professional mixing system, sound controls of a venue, etc.), or its functionality may be built into other stereo, computer, or electrical components (e.g., a CD player, MP3 player, iPod, DVD player, car radio, speaker system, etc.) so that it is not a stand-alone component.  
      System  400  may include the ability to read one or more different forms of storage medium via media slots  412  and  414 . Like the other systems of the present invention, system  400  may implement at least some of the steps of process  300  as described above. For example, a user may insert a CD into slot  414  which includes recording  114  (e.g., a CD of songs from  The Phantom of the Opera  as recorded in a recording studio). System  400  may then display selectable names or other identifying data of one or more selectable audio signals on any of its display screens. The user, for example, chooses recording  114 . The user may also insert a memory card into slot  412  which includes characterization  214  (e.g., the Majestic Theater in New York City). System  400  may also display one or more selectable names or other identifying data of the characterizations stored on the memory card. The user, for example, chooses characterization  214 .  
      When the user selects “PLAY,” system  400  selects, for example, recording  114  and characterization  214 . The particular recording and characterization that are selected may be based on user selections, system selections or a combination of user and system selections. System  400  then processes, for example, audio signal  114  and characterization  214  to produce an output signal. When the output signal is emitted, it sounds substantially similar to what would be heard in the acoustic environment represented by characterization  214  (e.g., the Majestic Theater) if recording  114  was played-back in the acoustic environment.  
      The memory card including the characterization of the Majestic Theater (discussed above) could also include a characterization of Three Rivers Stadium. Alternatively, the user may remove the memory card as discussed above and replace it with one having a characterization of Three Rivers Stadium. When “PLAY” is selected, system  400  selects the characterization of Three Rivers Stadium and the output signals produced by system  400  are substantially similar to the signals that would have been produced in a user-selectable seat of Three Rivers Stadium if  The Phantom of the Opera  was performed in Three Rivers Stadium. The user may also use system  400  to move their listening location to a different seat of Three Rivers Stadium (e.g., by navigating and selecting a different seat displayed on at least on of the display screens of system  400 ), to hear how  The Phantom of the Opera  would sound while sitting in the different seat.  
      As mentioned above and shown in  FIG. 4 , system  400  may include various displays to aide the user in the operation (e.g., the navigation and selection of an audio signal, characterization of an acoustic environment, location in an acoustic environment, etc.) of the system. For example, a venue display  402 , location display  404  and recording display  406  are all options that can be included in system  400  (other options, such as changing the material of the recording environment, can also be provided to the user). Venue display  402  can display a selectable list of venues and/or the particular venue currently being utilized by system  400 . Location display  404  can display a selectable list of seats and/or the particular seat or section currently being utilized by system  400 . Recording display  406  may display, for example, the song or track on the CD currently being played and/or one or more selectable lists of tracks available to system  400 . Alternatively, one skilled in the art will appreciate that the functionality of each display  402 , display  404  and display  406  may be combined into a single display screen.  
      System  400  can be coupled to one or more devices (such as system  100 , system  200 , system  300 , speakers  408 , etc.). Each of these devices can receive signals via communication paths  418 , as described above with respect to other communication paths.  
      For example, if system  400  is coupled to speakers  408 , the user can listen to the altered audio signals. Speakers  408  may be a surround-sound system or other type of speaker system that may help emphasize the presence of the reproduced audio signals, or they may consist of something as simple as a pair of headphones. System  400  also provides the user with the ability to select the volume, characterization, audio input signals, etc. through controls  416 .  
       FIG. 5  shows process  500  that may be utilized for the collection of royalty or other fees associated with the use of some embodiments of the present invention. For example, when a computer or computer controlled playback system is utilized, the environment provider (such as the Majestic Theater) or record label may sell/license a consumer access to an acoustic environment or recording. In this case, the provider could charge a one time fee for unlimited use or arrange any other desired payment system (e.g., charges for each individual access, charges for a monthly subscription, etc.). In this manner, owners of acoustic environment characterizations or audio recordings may be able to further commercialize their assets (e.g., their acoustic venue, sports stadium, local bar, song, comedy routine, concert, etc.). For simplicity, system  500  only shows acoustic environment characterizations being sold. Persons skilled in the art will appreciate that the same system can be used to sell/license audio signals or any other data a consumer may desire to use in accordance with the principles of the present invention.  
      In step  502 , a consumer begins to use a data network that can access stored characterizations (e.g., such as the internet, prepaid system, etc.). The consumer requests a characterization of an acoustic environment in step  504 , via the network, internet, world wide web, etc.  
      In steps  506  and  508 , the system determines whether the requested characterization is available by inquiring with and/or searching through a database of acoustic environment characterizations. The user is notified that the requested characterization is not available by returning to step  504  (and providing the appropriate message). If the characterization requested by the user is available, the system proceeds to step  510  to charge, process and/or confirm authorization of the payment from the consumer for the requested characterization.  
      In step  512 , the fee paid by the consumer is allocated to the system and, in step  514 , the user is provided with access to the database of environment characterizations. The system also processes the royalty payment, if any, for the owner of the purchased characterization. If a royalty payment is due, it may be allocated to the environment owner in step  518 .  
      The acoustic environment owner may collect the royalty payment(s) in step  520  , as well as control access by process  500  to the selected characterizations. If additional characterizations are to be added to the system, those environments are characterized in step  522  (in accordance with the process described in connection with  FIG. 2  above). Once processed, the new acoustic environment characterizations are sent to the database of acoustic environment characterizations in step  524 .  
      Persons skilled in the art will appreciate that the detection systems described above in accordance with the principles of the present invention are provided as illustrations of the invention only, and that the invention is not limited by the specific configurations described above. For example, the embodiment shown in  FIG. 4  may be combined with the embodiments shown in  FIGS. 1 and 2 . Combining these embodiments may be beneficial because, for example, system  400  may have access to the Internet and any songs and/or characterizations on the Internet (not shown).  
      Additionally, persons skilled in the art may consider combining the system of  FIG. 4  with system of  FIG. 2  in a manner that may allow system  400  to characterize the acoustic environment that speakers  408  are in. This characterization may be used as feedback, allowing system  400  to monitor the sound emitted and compensate for the acoustic environment speakers  408  are emitting the sound in. For example, the user&#39;s living room that  The Phantom of the Opera  is being played in may influence the sound after the recording was filtered by the Majestic Theater characterization. System  400  may characterize the room with equipment similar to system  200  and adjust the audio outputted from speakers  408  to compensate for any influence the acoustic environment of the room may have.  
      Moreover, it may also be understood by those skilled in the art that the various components of the detection systems according to the present invention may be manufactured together, or individually. They may be assembled as a single item or as multiple items to be linked together. However, as explained above, it is also contemplated that some or all of these components may utilize remote controls and/or displays, and that in certain embodiments, some components may be excluded (or combined with other components).  
      The invention is not limited in these manners. The above-described embodiments of the present invention are presented for purposes of illustration and not of limitation, and the present invention is limited only by the claims that follow.