PATENT DOCUMENT

Publication Number: US-9154869-B2
Application Number: US-201213343606-A
Country: US
Kind Code: B2

Title: Speaker with a large volume chamber and a smaller volume chamber

Abstract:
A portable electronic device having an enclosure having a top wall, a bottom wall, at least one sidewall connecting the top wall to the bottom wall, an acoustic output opening and a back volume defined by the top wall, the bottom wall and the at least one sidewall. A speaker driver is positioned within the enclosure, the speaker driver including a sound radiating surface having a top face and a bottom face for emitting sound waves therefrom. A frame member is attached to the speaker driver, the frame member forming a front volume chamber acoustically coupling the top face of the sound radiating surface to the acoustic output opening and a back volume chamber that overlaps a side of the speaker drive and acoustically couples the bottom face of the sound radiating surface to the back volume.

Claims:
What is claimed is: 
     
       1. A portable audio electronic device comprising:
 an enclosure having a top wall, a bottom wall, a sidewall connecting the top wall to the bottom wall, an acoustic output opening and a back volume chamber, wherein the back volume chamber is defined in part by portions of the top wall, the bottom wall and the sidewall and the acoustic output opening is formed in the sidewall; 
 a speaker driver positioned within the enclosure and resting against the bottom wall, the speaker driver comprising a sound radiating surface having a top face and a bottom face for emitting sound waves therefrom, wherein the top face faces the top wall; and 
 a frame member attached to the speaker driver, the frame member having a) frame sidewalls that are positioned around the sound radiating surface and extend from the speaker driver to the top wall to form a first chamber over the sound radiating surface and b) chamber walls extending from an opening in one of the frame sidewalls to the acoustic output opening to form a second chamber, the first chamber and the second chamber forming a front volume chamber acoustically coupling the top face of the sound radiating surface to the acoustic output opening, and 
 wherein the back volume chamber is acoustically coupled to the bottom face of the sound radiating surface, and wherein a portion of the back volume chamber is formed by a space surrounding the frame sidewalls and chamber walls of the front volume chamber and a volume of the back volume chamber is greater than a volume of the front volume chamber. 
 
     
     
       2. The portable audio electronic device of  claim 1  wherein the portion of the back volume chamber formed by the space surrounding the frame sidewalls and chamber walls of the front volume chamber is between a side of the driver and the enclosure sidewall. 
     
     
       3. The portable audio electronic device of  claim 1  wherein the front volume chamber comprises a horn shape. 
     
     
       4. The portable audio electronic device of  claim 1  wherein the portion of the back volume chamber formed by the space surrounding the frame sidewalls and chamber walls of the front volume chamber is between the front volume chamber and the top wall of the enclosure. 
     
     
       5. A speaker assembly comprising:
 an enclosure having a top wall, a bottom wall, a sidewall connecting the top wall to the bottom wall, an acoustic output opening and a back volume defined by the top wall, the bottom wall and the sidewall; 
 a speaker driver positioned within the enclosure and resting against the bottom wall, the speaker driver comprising a sound radiating surface having a top face and a bottom face for emitting sound waves therefrom, wherein an area between the top face of the sound radiating surface, the top wall of the enclosure and the sidewall of the enclosure defines a front volume area within the enclosure; and 
 a frame member attached to the speaker driver, the frame member forming (1) a front volume chamber within the front volume area acoustically couples the top face of the sound radiating surface to the acoustic output opening and (2) a back volume chamber acoustically coupling the bottom face of the sound radiating surface to the back volume, and 
 wherein the front volume chamber comprises frame sidewalls which surround the top face of the sound radiating surface and extend to the top wall to form a first chamber over the sound radiating surface, one of the frame sidewalls forming a frame opening between the speaker driver and the acoustic output opening, and chamber sidewalls forming a second chamber, which is between the speaker driver and the acoustic output opening, and wherein the second chamber acoustically couples the frame opening to the acoustic output opening, and 
 wherein the frame opening is smaller than an area of the frame sidewall, a space surrounding the chamber sidewalls and the frame sidewall forms a portion of the back volume chamber and a volume of the back volume chamber is greater than a volume of the front volume chamber. 
 
     
     
       6. The speaker assembly of  claim 5  wherein an area defined by the front volume chamber is less than an area defined by the back volume chamber. 
     
     
       7. The speaker assembly of  claim 5  wherein the acoustic output opening is formed within the sidewall of the enclosure and a portion of the front volume chamber is positioned between the speaker driver and the sidewall of the enclosure. 
     
     
       8. The speaker assembly of  claim 5  wherein the front volume chamber comprises a horn shape. 
     
     
       9. The speaker assembly of  claim 5  wherein a portion of the back volume chamber extends between the front volume chamber and the top wall of the enclosure. 
     
     
       10. An electronic audio system comprising:
 an enclosure having a top wall, a bottom wall, a sidewall connecting the top wall to the bottom wall, an acoustic output opening and a back volume chamber, wherein the back volume chamber is defined in part by portions of the top wall, the bottom wall and the sidewall; 
 a speaker driver positioned within the enclosure and resting against the bottom wall, the speaker driver comprising a sound radiating surface having a top face and a bottom face for emitting sound waves therefrom; and 
 a frame member attached to the speaker driver, the frame member forming a front volume chamber acoustically coupling the top face of the sound radiating surface to the acoustic output opening and the back volume chamber, which is acoustically coupled to the bottom face of the sound radiating surface, wherein the front volume chamber comprises frame sidewalls extending to the top wall so as to divide the front volume chamber into a first chamber over the sound radiating surface and a second chamber between the speaker driver and the acoustic output opening, one of the frame sidewalls having a frame opening acoustically coupled to the acoustic output opening by chamber sidewalls, a space surrounding the chamber sidewalls connects to the back volume chamber, and a volume of the back volume chamber is greater than a volume of the front volume chamber; 
 a memory to store an operating system program; and 
 a processor coupled to the memory to execute the operating system program and to send an audio signal to the speaker driver.

Description:
FIELD 
     An embodiment of the invention is directed to a speaker assembly having a reduced front volume. Other embodiments are also described and claimed. 
     BACKGROUND 
     In modern consumer electronics, audio capability is playing an increasingly larger role as improvements in digital audio signal processing and audio content delivery continue to happen. There is a range of consumer electronics devices that are not dedicated or specialized audio playback devices, yet can benefit from improved audio performance. For instance, smart phones are ubiquitous. These devices, however, do not have sufficient space to house high fidelity speakers. This is also true for portable personal computers such as laptop, notebook, and tablet computers, and, to a lesser extent, desktop personal computers and low profile television sets with built-in speakers. Such devices may require speaker enclosures or boxes that have a significant front volume, the space through a duct or channel in which sound from the front face of the driver diaphragm travels to an acoustic output port of the device. This may allow the driver to be set further rearward from the exit port of the enclosure. The speaker box also defines a back volume, the space within the enclosure that is open to the rear face of the diaphragm. The back volume in such a device is relatively small compared to, for instance, stand alone high fidelity speakers and dedicated digital music systems for handheld media players. In small back volume speaker boxes, improvements in low frequency performance are difficult to achieve since the air inside the box is confined to a small space which in turn may reduce the compliance of the driver. In addition, a large front volume tends to reduce the quality of sound output from the device. 
     SUMMARY 
     An embodiment of the invention is a portable electronic audio device having an enclosure formed by a top wall, a bottom wall, at least one sidewall connecting the top wall to the bottom wall and an acoustic output opening. The enclosure further includes a back volume defined by the top wall, the bottom wall and the at least one sidewall. A speaker driver is positioned within the enclosure, the speaker driver having a sound radiating surface having a top face and a bottom face for emitting sound waves therefrom. A frame member is attached to the speaker driver and defines a front volume chamber and a back volume chamber within the enclosure. The front volume chamber acoustically couples the top face of the sound radiating surface to the acoustic output opening and has a reduced volume to improve sound output of the device. The back volume chamber overlaps a side of the driver facing the acoustic output opening to form a back volume chamber having a greater volume than a volume of the front volume chamber. The enlarged back volume area helps to control a low frequency sound quality of the speaker driver. 
     The above summary does not include an exhaustive list of all aspects of the present invention. It is contemplated that the invention includes all systems and methods that can be practiced from all suitable combinations of the various aspects summarized above, as well as those disclosed in the Detailed Description below and particularly pointed out in the claims filed with the application. Such combinations have particular advantages not specifically recited in the above summary. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The embodiments are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and they mean at least one. 
         FIG. 1  is a perspective view of a speaker assembly and enclosure having a front volume. 
         FIG. 2  is a cross-sectional side view of the embodiment of  FIG. 1 . 
         FIG. 3  is a top view of the embodiment of  FIG. 1 . 
         FIG. 4  is a cross-sectional side view of another embodiment of a speaker assembly having a reduced front volume. 
         FIG. 5  depicts two instances of consumer electronics devices in which an embodiment of the invention may be implemented. 
         FIG. 6  is a block diagram of some of the constituent components of an embodiment of an electronic device in which an embodiment of the invention may be implemented. 
     
    
    
     DETAILED DESCRIPTION 
     In this section we shall explain several preferred embodiments of this invention with reference to the appended drawings. Whenever the shapes, relative positions and other aspects of the parts described in the embodiments are not clearly defined, the scope of the invention is not limited only to the parts shown, which are meant merely for the purpose of illustration. Also, while numerous details are set forth, it is understood that some embodiments of the invention may be practiced without these details. In other instances, well-known structures and techniques have not been shown in detail so as not to obscure the understanding of this description. 
       FIG. 1  is a perspective view of a speaker assembly and enclosure having a front volume. Speaker assembly  100  may be built into frame  102  which may be of a typical material used for speaker enclosures, such as plastic. The frame  102  may be part of a speaker enclosure or box  104 . The speaker enclosure or box  104  may be formed by top wall  106 , bottom wall  108  and side walls  110  connecting top wall  106  to bottom wall  108 . Speaker assembly  100  may include speaker driver  112  having sound radiating surface (SRS)  114  for producing acoustic or sound waves. Some of the sound waves produced by sound radiating surface  114  are directed out of acoustic output opening  124  of enclosure  104  while others are directed toward back volume  122  of enclosure  104 . For example, sound waves  116  produced by top face  114   a  of SRS  114  may be directed to acoustic output opening  124  while sound waves produced by bottom face  114   b  of SRS  114  may be directed to back volume area  122 . 
     Sound waves  116 ,  118  produced by opposing faces  114   a ,  114   b , respectively, of SRS  114  are out of phase with one another therefore it is important to prevent sound waves  116 ,  118  from interacting with one another. To prevent such interactions, the area within enclosure  104  is divided into a front volume area  120  and a back volume area  122  that are isolated from one another. Front volume area  120  is defined by front volume chamber  126  that acoustically connects the top face  114   a  of the SRS  114  to the acoustic output opening  124 . Back volume area  122  is defined by back volume chamber  130  that acoustically connects the bottom face  114   b  of the SRS  114  to the remaining area within enclosure  104 . 
     In the example of  FIG. 1 , front volume area  120  between top face  114   a  of SRS  114  and acoustic output opening  124  within which sound waves  116  travel is generally referred to as “front volume” because it acoustically connects the top face  114   a  of the SRS  114  to the acoustic output opening  124  and isolates sound waves  116  generated by top face  114   a  from sound waves  118  generated by bottom face  114   b . The remaining area  122  of enclosure  104  within which sound waves  118  travel is generally referred to as “back volume.” The front volume serves as a pathway for sound waves  116  produced by top face  114   a  to travel to acoustic output opening  124  and then out of the enclosure  104 , and into the open space that is surrounding a portable device in which the speaker assembly is integrated. The back volume of enclosure  104  helps to control the low frequency sound quality of the device. In particular, as SRS  114  moves up and down, it compresses the surrounding air. This compressed air can impede the larger up and down movement of SRS  114  at lower frequencies. The back volume alleviates this problem to some degree by increasing the volume of air around SRS  114  which in turn improves compliance of the surrounding air. It is therefore desirable for the back volume to be as large as possible. 
     The front volume should be relatively small compared to the back volume so that a direct pathway is provided to acoustic output opening  124 . It is difficult, however, to maintain a small front volume due to manufacturing constraints that require speaker driver  112  to be set back a distance from acoustic opening  124  (which in most cases will be positioned next to the exit port of the portable device housing). For example, the front volume area  120 , illustrated in  FIG. 1  by dashed lines, can be defined by front volume chamber  126  having a width (w) substantially equivalent to that of speaker driver  112 , a length (l) substantially equivalent to the width of enclosure  104  and a height (h) substantially equivalent to the distance between top face  114   a  of SRS  114  and top wall  106  of enclosure. Such a large area for sound travel to acoustic output opening  124  may not result in optimal sound output. Also, it can be seen that the large front volume area  120  extends into an area that could be used to increase a size of back volume area  122 . 
     To improve sound output,  FIG. 1  shows a reduced front volume chamber  128  formed by frame  102  and an enlarged back volume chamber  130 . Reduced front volume chamber  128  may be formed by frame  102  and have any size and dimension sufficient to reduce the front volume area between speaker driver  112  and acoustic output opening  124 , to less than that of chamber  126  defined by dashed lines. For example, in one embodiment, frame  102  includes frame sidewalls  150 ,  152  that extend vertically from top face  114   a  of SRS  114  to top wall  106  to isolate sound waves  116  generated by top face  114   a  from sound waves  118  generated by bottom face  114   b . Opening  154  is formed in frame sidewall  152  so that sound waves  116  can travel from top face  114   a  in a direction of acoustic output opening  124 . 
     Reduced front volume chamber  128  may be formed by chamber sidewalls  132 ,  134  that extend from opposing sides of opening  154  to acoustic output opening  124 . In some embodiments, opening  154  is smaller than acoustic output opening  124  such that chamber sidewalls  132 ,  134  extend at an angle from opening  154  to acoustic output opening  124 . Top chamber wall  136  also extends at an angle from a top side of opening  154  to acoustic output opening  124  and bottom chamber wall  138  extends from a bottom side of opening  154  to acoustic output opening  124 . In this aspect, reduced front volume chamber  128  has a substantially horn shaped profile, which in turn reduces a size of the pathway through which sound waves  116  must travel to exit enclosure  104  through acoustic output port  124 . Although in the illustrated embodiment, reduced front volume chamber  128  is formed by chamber sidewalls  132 ,  134 , top chamber wall  136  and bottom chamber wall  138 , it is contemplated that one or more of the walls may be omitted or configured in any manner sufficient to reduce the front volume area to less than that of the front volume area of chamber  126  (area defined by dashed lines). 
     The enlarged back volume chamber  130  includes the area between the outer surfaces of chamber sidewalls  132 ,  134 , top chamber wall  136 , bottom chamber wall  138  of reduced front volume chamber  128  and the walls forming enclosure  104 . In this aspect, a portion of back volume chamber  130  may overlap a side of speaker driver  112  facing acoustic output opening  124 . In other words, front volume area  120  is divided such that a portion of it becomes part of back volume chamber  130  resulting in back volume chamber  130  having an increased volume which is greater than a volume of reduced front volume chamber  128 . In embodiments where acoustic output opening  124  is formed within one of sidewalls  110  of enclosure  104 , the portion of back volume chamber  130  overlapping the side of driver  112  is between the side of the driver and sidewall  110 . In addition, in embodiments where reduced front volume chamber  128  has a substantially horn shaped configuration as illustrated in  FIG. 1 , back volume chamber  130  is formed around reduced front volume chamber  128 . For example, a portion of back volume chamber  130  may also be between reduced front volume chamber  128  and top wall  106  and/or bottom wall  108  of enclosure  104 . 
       FIG. 2  illustrates a side cross-sectional view of the speaker assembly illustrated in  FIG. 1 . From this view, the portions of back volume chamber  130  between reduced front volume chamber  128  and top wall  106  and bottom wall  108  of enclosure  104  can be seen.  FIG. 3  illustrates a top view of the speaker assembly illustrated in  FIG. 1 . From this view, the portions of back volume chamber  130  between the side of driver  112  facing acoustic opening  124  and sidewall  110  of enclosure  104  can be seen. In addition, the horn shape of reduced front volume chamber  128  is illustrated. 
       FIG. 4  illustrates a side cross-sectional view of another embodiment of a speaker assembly. In this embodiment, acoustic output opening  424  is formed within top wall  406  of enclosure  404 , and in particular directly above the SRS  414  of the speaker driver  412 . When acoustic output opening  424  is formed within top wall  406 , the front volume area  426  is generally defined as the area between top face  414   a  of SRS  414  of speaker driver  412 , side walls  410  of enclosure  404  and top wall  406  of enclosure  404 . The front volume area  426  is illustrated in  FIG. 4  by dashed lines. This front volume area  426  is sealed off from the back volume area, which is generally defined as the area below bottom face  414   b  of SRS  414 . In this aspect, sound waves  416  generated by top face  414   a  of SRS  414  are isolated from sound waves  418  generated by bottom face  414   b  of SRS  414   b . Alternatively, an acoustic output opening may be formed in bottom wall  408  of enclosure  404  such that the front volume area may be defined as the area between bottom face  414   b  of SRS  414  and bottom wall  408  of enclosure  404  and the remaining area within enclosure  404  defines the back volume. 
     To create a reduced front volume chamber  428  having an area that is less than front volume area  426  (in other words, less than an area defined between top face  414   a  of SRS  414  and top wall  406  of enclosure  404 ), frame  402  includes overlapping segments  432 ,  434 . Overlapping segments  432 ,  434  extend inwardly from sidewalls  410  of enclosure  404  and overlap top face  414   a  of speaker driver  412 . Overlapping segments  432 ,  434  occupy a substantial area of front volume area  426  thereby providing a reduced front volume chamber  428 . In addition, overlapping segments  432 ,  434  form pockets  436 ,  438  that connect to back volume chamber  430 . In this aspect, back volume chamber  430  includes segments  432 ,  434  which overlap an area between driver  412  and top wall  406  of enclosure  404 . In addition, ends  440 ,  442  of overlapping segments  432 ,  434  may be tapered inward toward one another such that a portion of reduced front volume chamber  428  is horn shaped. Although overlapping segments  432 ,  434  are shown having a substantially rectangular profile, it is contemplated that overlapping segments  432 ,  434  may have any shape and size suitable for reducing the front volume area and increasing the back volume area. 
     By allocating portions of the front volume area to back volume as previously discussed, the back volume area is substantially increased and the front volume area is reduced. For example, the back volume area of low rise devices is considered to be relatively small, for example, in the range of about 0.5 cubic cm to 2 cubic cm. According to the embodiments disclosed herein, however, the back volume chamber is substantially increased such that the back volume may be greater than, for example, 2 cubic cm. 
     The concepts described here, however, need not be limited to speaker enclosures whose back volume is in that range. For example, as seen in  FIG. 5 , the speaker assembly having a reduced front volume may be a speakerphone unit that is integrated within a consumer electronic device  502  such as a smart phone with which a user can conduct a call with a far-end user of a communications device  504  over a wireless communications network; in another example, the speaker assembly may be integrated within the housing of a tablet computer. These are just two examples of where the speaker may be used, it is contemplated, however, that the speaker assembly may be used with any type of electronic device in which a reduced front volume area is desired, for example, a desk top computing device or a flat screen television. 
       FIG. 6  is a block diagram of some of the constituent components of an embodiment of an electronic device within which the previously described speaker assembly having a reduced front volume chamber may be implemented. Device  600  may be any one of several different types of consumer electronic devices that can be easily held in the user&#39;s hand during normal use. In particular, the device  600  may be any speaker-equipped mobile device, such as a cellular phone, a smart phone, a media player, or a tablet-like portable computer, all of which may have a built-in speaker system. 
     In this aspect, electronic device  600  includes a processor  612  that interacts with camera circuitry  606 , motion sensor  604 , storage  608 , memory  614 , display  622 , and user input interface  624 . Main processor  612  may also interact with communications circuitry  602 , primary power source  610 , speaker  618 , and microphone  620 . The various components of the electronic device  600  may be digitally interconnected and used or managed by a software stack being executed by the processor  612 . Many of the components shown or described here may be implemented as one or more dedicated hardware units and/or a programmed processor (software being executed by a processor, e.g., the processor  612 ). 
     The processor  612  controls the overall operation of the device  600  by performing some or all of the operations of one or more applications or operating system programs implemented on the device  600 , by executing instructions for it (software code and data) that may be found in the storage  608 . The processor may, for example, drive the display  622  and receive user inputs through the user input interface  624  (which may be integrated with the display  622  as part of a single, touch sensitive display panel). In addition, processor  612  may send an audio signal to speaker  618  to facilitate operation of speaker  618 . 
     Storage  608  provides a relatively large amount of “permanent” data storage, using nonvolatile solid state memory (e.g., flash storage) and a kinetic nonvolatile storage device (e.g., rotating magnetic disk drive). Storage  608  may include both local storage and storage space on a remote server. Storage  608  may store data as well as software components that control and manage, at a higher level, the different functions of the device  600 . 
     In addition to storage  608 , there may be memory  614 , also referred to as main memory or program memory, which provides relatively fast access to stored code and data that is being executed by the processor  612 . Memory  614  may include solid state random access memory (RAM), e.g., static RAM or dynamic RAM. There may be one or more processors, e.g., processor  612 , that run or execute various software programs, modules, or sets of instructions (e.g., applications) that, while stored permanently in the storage  608 , have been transferred to the memory  614  for execution, to perform the various functions described above. 
     The device  600  may include communications circuitry  602 . Communications circuitry  602  may include components used for wired or wireless communications, such as two-way conversations and data transfers. For example, communications circuitry  602  may include RF communications circuitry that is coupled to an antenna, so that the user of the device  600  can place or receive a call through a wireless communications network. The RF communications circuitry may include a RF transceiver and a cellular baseband processor to enable the call through a cellular network. For example, communications circuitry  602  may include Wi-Fi communications circuitry so that the user of the device  600  may place or initiate a call using voice over Internet Protocol (VOIP) connection, transfer data through a wireless local area network. 
     The device  600  may include a motion sensor  604 , also referred to as an inertial sensor, that may be used to detect movement of the device  600 . The motion sensor  604  may include a position, orientation, or movement (POM) sensor, such as an accelerometer, a gyroscope, a light sensor, an infrared (IR) sensor, a proximity sensor, a capacitive proximity sensor, an acoustic sensor, a sonic or sonar sensor, a radar sensor, an image sensor, a video sensor, a global positioning (GPS) detector, an RP detector, an RF or acoustic doppler detector, a compass, a magnetometer, or other like sensor. For example, the motion sensor  600  may be a light sensor that detects movement or absence of movement of the device  600 , by detecting the intensity of ambient light or a sudden change in the intensity of ambient light. The motion sensor  600  generates a signal based on at least one of a position, orientation, and movement of the device  600 . The signal may include the character of the motion, such as acceleration, velocity, direction, directional change, duration, amplitude, frequency, or any other characterization of movement. The processor  612  receives the sensor signal and controls one or more operations of the device  600  based in part on the sensor signal. 
     The device  600  also includes camera circuitry  606  that implements the digital camera functionality of the device  600 . One or more solid state image sensors are built into the device  600 , and each may be located at a focal plane of an optical system that includes a respective lens. An optical image of a scene within the camera&#39;s field of view is formed on the image sensor, and the sensor responds by capturing the scene in the form of a digital image or picture consisting of pixels that may then be stored in storage  608 . The camera circuitry  600  may also be used to capture video images of a scene. 
     Device  600  also includes primary power source  610 , such as a built in battery, as a primary power supply. 
     In still further embodiments, the previously described speaker assembly having a reduced front volume chamber may be implemented within a non-mobile electronic device having a built-in speaker system, for example, a desk top computer or television. Similar to device  600 , the non-mobile electronic device may include a processor that interacts with, a storage unit, memory unit, display, user input interface, communications circuitry, an optical drive, power supply, speaker, and microphone. The various components of the electronic device may be digitally interconnected and used or managed by a software stack being executed by the main processor. Many of the components shown or described here may be implemented as one or more dedicated hardware units and/or a programmed processor (software being executed by a processor, e.g., the main processor). 
     While certain embodiments have been described and shown in the accompanying drawings, it is to be understood that such embodiments are merely illustrative of and not restrictive on the broad invention, and that the invention is not limited to the specific constructions and arrangements shown and described, since various other modifications may occur to those of ordinary skill in the art. The description is thus to be regarded as illustrative instead of limiting.

Metadata:
Filing Date: 20120104
Publication Date: 20151006
Grant Date: 20151006
Priority Date: 20120104
Inventors: COHEN SAWYER I.
WILK CHRISTOPHER
DAVE RUCHIR M.
Assignee: APPLE INC
CPC Classifications: [{"code": "H04R1/2842", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04M1/6041", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04R1/30", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04M1/035", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04R2499/11", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04B1/38", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04M1/6041", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04R2499/11", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04R1/2842", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04R1/30", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04R1/02", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04R1/2842", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04R2499/11", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04M1/035", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04M1/6041", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04M1/035", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04R1/30", "inventive": true, "first": false, "tree": "[]"}]
Family ID: 47435853