Patent Publication Number: US-2013235196-A1

Title: Real-time multimedia signal transmission device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This non-provisional application is a continuation-in-part patent application of U.S. application Ser. No. 13/337,557 filed on Dec. 27, 2011, which claims priority under 35 U.S.C. §119(a) on Patent Application No. 100210559 filed in Taiwan, R.O.C. on Jun. 10, 2011, the entire contents of which are hereby incorporated by reference. 
    
    
     TECHNICAL FIELD 
     The disclosure relates to a real-time multimedia signal transmission device and more particularly to a real-time multimedia signal transmission device that can wirelessly link to smart handheld devices to provide a remote monitoring function and a remote control function. 
     BACKGROUND 
     A conventional camcorder usually includes a camera and a display movably arranged at one lateral side of the camera. When using the camcorder to shoot pictures, the display is pivotally turned outward from the camera, and the camera is used for capturing static or dynamic images and sounds or used to play back the captured images. The images being captured are shown via the display to complete the function of shooting pictures. 
     Since the conventional camcorder is equipped with a display, it requires higher manufacturing cost and is sold at a high price. Further, with the conventional camcorder, a user has to always stay with the camcorder for capturing still or dynamic images and sounds. Therefore, the convenience in using the conventional camcorder is low. 
     It is therefore desirable to develop a device that has reduced manufacturing cost and can be remotely monitored while providing diversified functions. 
     SUMMARY 
     A real-time multimedia signal transmission device according to an embodiment of the disclosure includes a case including a multimedia information capture section, a processing unit, a signal conversion section and a wireless transceiver section. The multimedia information capture section captures multimedia information. The processing unit is electrically connected to the multimedia information capture section, and processes output of the multimedia information capture section to generate multimedia signals. The signal conversion section is electrically connected to the processing unit, processes the multimedia signals to generate multimedia packet signals, and processes a remote control signal to obtain a remote control command. The wireless transceiver section is electrically connected to the signal conversion section, and wirelessly transmits the multimedia packet signals to at least one smart handheld device which links to the real-time multimedia signal transmission device wirelessly. 
     When the wireless transceiver section wirelessly receives a remote control signal from one of the at least one smart handheld device, the processing unit controls the real-time multimedia signal transmission device to perform a function control according to the remote control command. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure will become more fully understood from the detailed description given herein below for illustration only and thus does not limit the present disclosure, wherein: 
         FIG. 1  is a schematic diagram of a real-time multimedia signal transmission device according to an embodiment of the disclosure in use; 
         FIG. 2  is a block diagram of the real-time multimedia signal transmission device in  FIG. 1  according to an embodiment of the disclosure; 
         FIG. 3  is a flow chart of a multimedia signal transmission method according to an embodiment of the disclosure; 
         FIG. 4  is a flow chart of an automatic selection procedure according to an embodiment of the disclosure; 
         FIG. 5  is a schematic diagram of the real-time multimedia signal transmission device in  FIG. 2  in use; 
         FIG. 6  is a flow chart of a remote control procedure according to an embodiment of the disclosure; 
         FIG. 7  is a schematic diagram of a real-time multimedia signal transmission device according to an embodiment of the disclosure in use; 
         FIG. 8  is a block diagram of the real-time multimedia signal transmission device in  FIG. 7  according to an embodiment of the disclosure; 
         FIG. 9  is a flow chart of a multimedia signal transmission method according to an embodiment of the disclosure; 
         FIG. 10  is a flow chat of a multimedia signal transmission method according to an embodiment of the disclosure when the RF transceiving unit and the network transmission unit in  FIG. 7  do not operate simultaneously; 
         FIG. 11  is a flow chart of an automatic selection procedure according to an embodiment of the disclosure; and 
         FIG. 12  is a schematic diagram of the real-time multimedia signal transmission device in  FIG. 8  in use. 
     
    
    
     DETAILED DESCRIPTION 
     In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing. 
     Refer to  FIG. 1  which is a schematic diagram of a real-time multimedia signal transmission device according to an embodiment of the disclosure in use, and to  FIG. 2  which is a block diagram of a real-time multimedia signal transmission device according to an embodiment of the disclosure. As shown, a real-time multimedia signal transmission device  1  in the disclosure can be used with at least one smart handheld device  10 , e.g. a smart mobile phone, a smart personal digital assistant (PDA), a portable computer or a tablet computer. 
     The smart handheld device  10  as shown in  FIG. 7  includes a memory unit  101 , a processing unit  102 , a display  103 , a wireless transceiver section  105  and a speaker  106 . 
     The wireless transceiver section  105  is, e.g. a network transceiving unit, a Bluetooth transceiving unit, a radio frequency (RF) transceiving unit or a combination thereof The processing unit  102  is electrically connected to the memory unit  101 , the display  103 , the wireless transceiver section  105  and the speaker  106  to control the operation of each elements and access and process data or signal. 
     The real-time multimedia signal transmission device  1  has a case  11  including a multimedia information capture section  110 , a processing unit  120 , a wireless transceiver section  140  and a signal conversion section  130  according to an embodiment. The multimedia information capture section  110  and the signal conversion section  130  are electrically connected to the processing unit  120  respectively, and the wireless transceiver section  140  is electrically connected to the signal conversion section  130 . Therefore, the processing unit  120  can control and coordinate the operation of each component in the real-time multimedia signal transmission device  2 , and process and access data and signals. For example, the processing unit  120  receives and converts at least one of an image signal and a sound signal into a multimedia signal. The processing unit  120  is, for example, a microprocessor. 
     The multimedia information capture section  110  is used for capturing multimedia information and includes at least one of an image capture section  111  and a sound capture unit  112 . The image capture section  111  is used for capturing external images, processing the captured images to generate image signals, and transmitting the image signals to the processing unit  120 . In an embodiment, the image capture section  111  includes a shooting unit  113 , a light emitting unit  114 , or a combination thereof. The shooting unit  113  is, for example, a lens with a CCD (charge coupled device) sensor or a CMOS (complementary metal-oxide-semiconductor) sensor, and having the zooming function for shooting both static and dynamic images. In the event of insufficient light source at the shooting site, the light emitting unit  114 , e.g. a light emitting diode (LED), can serve as an aid in shooting. The sound capture unit  112  is, for example, a microphone, used for capturing external sounds, processing the captured sounds to generate sound signals, and transmitting the sound signals to the processing unit  120 . 
     In an embodiment, the signal conversion section  130  is a secure digital input and output (SDIO) interface unit. The signal conversion section  130  is used for receiving the multimedia signal from the processing unit  120  and processing the multimedia signal to generate a multimedia packet signal according to a wireless transceiving standard of the wireless transceiver section  140 . On the other hand, the signal conversion section  130  is also used for processing a remote control signal to obtain a remote control command, and transmitting the remote control command to the processing unit  120 . 
     The wireless transceiver section  140  includes a Bluetooth transceiving unit  141  and a network transceiving unit  142 , e.g. a Wifi transceiving module. The Bluetooth transceiving unit  141  is used for receiving the multimedia packet signal from the signal conversion section  130 , and transmitting the multimedia packet signal to the smart handheld device  10  when wirelessly linking to the wireless transceiver section  105  of the smart handheld device  10 . The network transceiving unit  142  is used for receiving the multimedia packet signal from the signal conversion section  130 , and transmitting the multimedia packet signal to the smart handheld device  10  when wirelessly linking to the wireless transceiver section  105  of the smart handheld device  10 , or to upload the multimedia packet signal to a network. Furthermore, the Bluetooth transceiving unit  141  and the network transceiving unit  142  are further used for receiving the remote control signal sent out from one smart handheld device  10 , and transmitting the remote control signal to the signal conversion section  130 . 
     In the disclosure, one of the Bluetooth transceiving unit  141  and the network transceiving unit  142  is selected to perform wireless transmission. In other words, while the Bluetooth transceiving unit  141  operates, the network transceiving unit  142  does not operate. For example, when the real-time multimedia signal transmission device  1  is used in the vicinity of the smart handheld device  10 , the Bluetooth transceiving unit  141  is selected to wirelessly link to the wireless transceiver section  105  of the smart handheld device  10 . On the other hand, when the real-time multimedia signal transmission device  1  is used at a location quite distant from the smart handheld device  10 , the network transceiving unit  142  is selected to wirelessly link to the wireless transceiver section  105  of the smart handheld device  10 . 
     Moreover, the real-time multimedia signal transmission device  1  further includes at least one of a multimedia information playing section  150 , a memory unit  160 , a data input and output unit  170 , a control unit  180  and a power unit  190 . The multimedia information playing section  150 , the memory unit  160 , the data input and output unit  170 , the control unit  180  and the power unit  190  are respectively connected to the processing unit  120  electrically. 
     The multimedia information playing section  150  includes at least one of a sound playing unit  151  and an image display unit  152 . The sound playing unit  151  is used for receiving the multimedia signal from the processing unit  120  to play sounds. The sound playing unit  151  can be, for example, a speaker. The image display unit  152  is used for receiving the multimedia signal from the processing unit  120  to display images. The image display unit  152  can be, for example, a display panel. 
     The memory unit  160  is, for example, a memory, and is used for storing the multimedia signal, and then the stored multimedia signal is wirelessly transmitted to the smart handheld device  10  later for playing, or is directly played via the multimedia information playing section  150  later. 
     The data input and output unit  170  is one of various types of connection ports. Via the data input and output unit from a terminal end, other multimedia signals can be input to the processing unit  120  and then played via the smart handheld device  10  or directly played via the multimedia information playing section  150 . The data input and output unit  170  is also used for outputting the multimedia signals obtained by capturing multimedia information to other electronic devices (not shown), such as a hard disk, a memory card and a computer. 
     The control unit  180  is, for example, a set of physical switches or keys or a set of virtual switches or keys. The virtual switches or keys can be shown on the image display unit  152  in the multimedia information playing section  150  for touch control. The control unit  180  allows a user to input commands. The commands are transmitted to the processing unit  120 . Via commands provided by the control unit  180 , the processing unit  120  controls the real-time multimedia signal transmission device  1  to perform a function control corresponding to each command, such as power on or off, focusing and zooming of the lens of the image capture section, recording function on or off, selection of transmission destinations, transmission function on or off, or selection of transceiving units. 
     The power unit  190  is used for supplying power to all elements in the real-time multimedia signal transmission device  1 . The power unit  190  is, for example, an internal power supply or an external power supply, depending on actual need in use. An internal power supply is, for example, a general battery or a rechargeable battery, and an external power supply is, for example, a power generator or an outlet power source. 
     The relative multimedia signal transmission method is described as follows.  FIG. 3  illustrates a flow chart of a multimedia signal transmission method according to an embodiment of the disclosure. Firstly, a user can use the multimedia information capture section  110  in the real-time multimedia signal transmission device  1  in  FIG. 2  to capture multimedia information to obtain at least one of an image signal and a sound signal (step S 110 ). If the real-time multimedia signal transmission device  1  is a sound recorder, the sound capture unit  112  captures sounds to obtain sound signals. If the real-time multimedia signal transmission device  1  is a camera without a microphone, the image capture section  111  captures images to obtain image signals. If the real-time multimedia signal transmission device  1  is a video camera or a digital camera having a microphone, the image capture section  111  and the sound capture unit  112  respectively capture sounds and images to obtain image signals and sound signals. 
     Subsequently, the processing unit  120  receives the at least one of the image signal and the sound signal to generate a multimedia signal (step S 120 ). The processing unit  120  determines whether any smart handheld device  10  is linked (step S 130 ). Assume that there are three smart handheld devices  10  shown in  FIG. 1 , it is understood the real-time multimedia signal transmission device  1  can be wirelessly linked to at least one of the three smart handheld devices  10 . When the processing unit  120  does not detect any smart handheld device  10  wirelessly linked to the wireless transceiver section  140 , the processing unit  120  waits. When at least one smart handheld device  10  is wirelessly linked to the wireless transceiver section  140 , the processing unit  120  transmits the multimedia signal to the signal conversion section  130 . 
     After the signal conversion section  130  processes the multimedia signal to generate a multimedia packet signal and transmits the multimedia packet signal to the wireless transceiver section  140  (step S 140 ), one of the Bluetooth transceiving unit  141  and the network transceiving unit  142  in the wireless transceiver section  140  wireless transmits the multimedia packet signal to at least one smart handheld device  10  (step S 150 ). 
     Therefore, the smart handheld device  10  can display or play multimedia information of the multimedia signal of the received multimedia packet signal in real time, via its display  103  and speaker  106 . Further, the multimedia signal can be stored in the memory unit  101  of the smart handheld device  10 , allowing a user to repeatedly play the multimedia information on the smart handheld device  10 . 
     In step S 130 , one of the Bluetooth transceiving unit  141  and the network transceiving unit  142  in  FIG. 2  can be selected. In an embodiment, the processing unit  120  directly selects one of the Bluetooth transceiving unit  141  and the network transceiving unit  142  according to a selection command inputted by the control unit  180 . 
     In this and some embodiments, the processing unit  120  automatically selects the 
     Bluetooth transceiving unit  141  or the network transceiving unit  142  through an automatic selection procedure as shown in  FIG. 4  which is a flow chart of step S 120  according to an embodiment of the disclosure. In other words, preset one of the Bluetooth transceiving unit  141  and the network transceiving unit  142  is selected (step S 131 ). 
     When the preset one of the Bluetooth transceiving unit  141  and the network transceiving unit  142  is linked successfully (step S 132 ), the preset one of the Bluetooth transceiving unit  141  and the network transceiving unit  142  will receive a response sent from the linked smart handheld device  10  (S 135 ). When the preset of the Bluetooth transceiving unit  141  and the network transceiving unit  142  is linked unsuccessfully (step S  132 ), the processing unit  120  selects the other one of the Bluetooth transceiving unit  141  and the network transceiving unit  142  (step S 133 ). When the other one of the 
     Bluetooth transceiving unit  141  and the network transceiving unit  142  links to the smart handheld device  10  unsuccessfully (step S 134 ), the processing unit  120  waits or pauses wireless transmission. Otherwise, the other one of the Bluetooth transceiving unit  141  and the network transceiving unit  142  will receive a response sent from the linked smart handheld device  10  (step S 135 ). Through the response sent out from the linked smart handheld device  10 , the processing unit  120  can know what to drive for wireless transmission. 
     In the disclosure, a remote control function is available when a plurality of smart handheld devices  10  are linked to the real-time multimedia signal transmission device  1  as shown in  FIG. 5 . One of the smart handheld devices  10  is set as a remote controller and can utilize its built-in player module  104  to remotely control or actuate various functions of the real-time multimedia signal transmission device  1 . The other ones of the smart handheld devices  10  are set as remote receivers and continuously receive the multimedia packet signal outputted by the real-time multimedia signal transmission device  1  for playing. 
       FIG. 6  is a flow chart of a remote control procedure according to an embodiment of the disclosure. When the remote controller links to one of the Bluetooth transceiving unit  141  and the network transceiving unit  142 , virtual switches or keys shown on the player module  104  can be used for inputting a zooming-in command, and then the wireless transceiver section  105  sends a corresponding remote control signal to the wireless transceiver section  140  of the real-time multimedia signal transmission device  1  (step S 210 ). 
     After the signal conversion section  130  processes the remote control signal transmitted by the wireless transceiver section  140  to obtain a remote control command and transmit the remote control command to the processing unit  120  (step S 220 ), the processing unit  120  controls the real-time multimedia signal transmission device  1  to perform a corresponding function control (step S 230 ). For example, the shooting unit  213  performs the zoom-in function according to the remote control command, so as to update the multimedia signal. Subsequently, the updated multimedia signal carried by the multimedia packet signal is wirelessly transmitted to the remote receiving devices for playing. 
     Refer to  FIG. 7  which is a schematic diagram of a real-time multimedia signal transmission device according to an embodiment of the disclosure in use, and to  FIG. 8  which is a block diagram of the real-time multimedia signal transmission device in  FIG. 7  according to an embodiment of the disclosure. A real-time multimedia signal transmission device  2  can be used with at least one smart handheld device  10 . The smart handheld device  10  in  FIG. 1  and that in  FIG. 7  are the same, thus be not described again hereinafter. 
     The real-time multimedia signal transmission device  2  has a case  21  including a multimedia information capture section  210 , a processing unit  220 , a signal conversion section  230  and a wireless transceiver section  240  according to an embodiment. The multimedia information capture section  210  and the processing unit  220  are the same as the multimedia information capture section  110  and the processing unit  120  in  FIG. 2 , thus being not described again hereinafter. 
     The signal conversion section  230  includes a radio frequency (RF) interface unit  231  and a Web control interface unit  232 . The wireless transceiver section  240  includes a RF transceiving unit  241  and a network transceiving unit  242 . The RF interface unit  231  is electrically connected between the processing unit  220  and the RF transceiving unit  241  and used for processing the multimedia signal to generate a multimedia packet signal, i.e. a first multimedia packet signal, according to its wireless transceiving standard. The RF transceiving unit  241  is used for wirelessly transmitting the first multimedia packet signal to the smart handheld device  10 . The Web control interface unit  232  is electrically connected between the processing unit  220  and the network transceiving unit  242  and used for processing the multimedia signal to generate a multimedia packet signal, i.e. a second multimedia packet signal, according to its wireless transceiving standard. The network transceiving unit  242  is used for wirelessly transmitting the second multimedia packet signal to the smart handheld device  10  and uploading the second multimedia packet signal to a network. 
     Besides, the RF transceiving unit  241  and the network transceiving unit  242  are also used for receiving a remote control signal and transmitting the remote control signal to the RF interface unit  231  and the Web control interface unit  232  respectively when one smart handheld device  10  is installed with an application software and sends out the remote control signal. The RF interface unit  231  and the Web control interface  232  are also used for processing the remote control signal to obtain a remote control command which is used for controlling the real-time multimedia signal transmission device  2  via the processing unit  220  to perform a corresponding function control, e.g. focusing and zooming of the lens of the image capture section  211 , capture function on and off, recording function on or off, selection function of transmission destinations, transmission function on or off or the like. The RF interface unit  231  is, for example, a universal asynchronous receiver and transmitter (UART) interface unit or a universal synchronous asynchronous receiver and transmitter (USART) interface unit. The RF transceiving unit  241  is, for example, a RF 2.4G transceiving module. The network transceiving unit  242  is, for example, a Wifi transceiving module. 
     In this and some embodiments, the real-time multimedia signal transmission device  2  further includes at least one of a multimedia information playing section  250 , a memory unit  260 , a data input and output unit  270 , a control unit  280  and a power unit  290 . The multimedia information playing section  250 , the memory unit  260 , the data input and output unit  270 , the control unit  280  and the power unit  290  can refer to the multimedia information playing section  150 , the memory unit  160 , the data input and output unit  170 , the control unit  180  and the power unit  190  in  FIG. 2  respectively, thus being not described again hereinafter. The relative multimedia signal transmission method is described as follows. 
       FIG. 9  illustrates a multimedia signal transmission method according to an embodiment of the disclosure. After capturing multimedia information via the multimedia information capture section  210  in  FIG. 8  to obtain at least one of an image signal and a sound signal (step S 310 ) and then processing the at least one of the image signal and the sound signal to generate a multimedia signal via the processing unit  220  (step S 320 ), the processing unit  220  determines whether the wireless transceiver section  240  has linked to any smart handheld device  10  in  FIG. 7  (step S 330 ). 
     When no smart handheld device  10  has been linked, the processing unit  220  waits. When at least one smart handheld device  10  has been linked, the signal conversion section  230  processes the multimedia signal to generate at least one of a first multimedia packet signal and a second multimedia packet signal (step S 340 ). Finally, the wireless transceiver section  240  wireless transmits the at least one of the first and second multimedia packet signals to the at least one smart handheld device  10  (step S 350 ). 
     In an embodiment, the RF transceiving unit  241  and the network transceiving unit  242  can operate simultaneously, that is, the RF interface unit  231  and the Web control interface unit  232  operate simultaneously. The first and second multimedia packet signals can be sent out simultaneously, and the at least one smart handheld device  10  can receive one of the first and second multimedia packet signals according to its wireless transceiving standard. 
     In this and some embodiments, the RF transceiving unit  241  and the network transceiving unit  242  do not operate simultaneously according to various usage requirements, so that the first and second multimedia packet signals are not sent out simultaneously. For example, when the real-time multimedia signal transmission device  2  is used in the vicinity of the smart handheld device  10 , the RF transceiving unit  241  is selected to wirelessly linking to the smart handheld device  10 . On the other hand, when the real-time multimedia signal transmission device  2  is used at a location quite distant from the smart handheld device  10 , the network transceiving unit  242  is selected to wirelessly linking to the smart handheld device  10 . 
     Refer to  FIG. 10  which is a flow chat of a multimedia signal transmission method according to an embodiment of the disclosure when the RF transceiving unit and the network transceiving unit in  FIG. 7  do not operate simultaneously. In step S 330  in  FIG. 9 , the processing unit  220  determines which one of the RF transceiving unit  241  and the network transceiving unit  242  in  FIG. 7  is selected (step S 430 ). 
     When the RF transceiving unit  241  is selected, the processing unit  220  drives the RF transceiving unit  241  to wirelessly link to the at least one smart handheld device  10  (step S 431 ). After the RF transceiving unit  241  links to the at least one smart handheld device  10 , the RF interface unit  231  processes the multimedia signal obtained in step  5220  in 
       FIG. 9  to generate the first multimedia packet signal (step S 441 ), and the RF transceiving unit  241  wirelessly transmits the first multimedia packet signal to the at least one smart handheld device  10  (step S 451 ). 
     On the other hand, when the network transceiving unit  242  is selected in step  5430 , the processing unit  220  drives the network transceiving unit  242  to link to the at least one smart handheld device  10  (step S 432 ). After the network transceiving unit  242  links to the at least one smart handheld device  10 , the Web control interface unit  232  processes the multimedia signal to generate the second multimedia packet signal (step S 442 ), and the network transceiving unit  242  wirelessly transmits the second multimedia packet signal to the at least one smart handheld device  10  (step S 452 ). 
     In an embodiment, the processing unit  220  directly selects one of the RF transceiving unit  241  and the network transceiving unit  242  to perform wireless communication according to a selection command inputted by the control unit  280 . In this and some embodiments, the processing unit  220  automatically selects one of the RF transceiving unit  241  and the network transceiving unit  242  through an automatic selection procedure as shown in  FIG. 11  being a flow chart of an automatic selection procedure according to an embodiment of the disclosure. 
     Firstly, preset one of the RF transceiving unit  241  and the network transceiving unit  242  is selected (step S 531 ). When the preset one of the RF transceiving unit  241  and the network transceiving unit  242  is linked successfully (step S 532 ), the preset one of the RF transceiving unit  241  and the network transceiving unit  242  will receive a response sent from the linked smart handheld device  10  (S 535 ). When the preset one of the RF transceiving unit  241  and the network transceiving unit  242  is linked unsuccessfully (step S 532 ), the processing unit  220  selects the other one of the RF transceiving unit  241  and the network transceiving unit  242  (step S 533 ). When the other one of the RF transceiving unit  241  and the network transceiving unit  242  links to the smart handheld device  10  unsuccessfully (step S 534 ), the processing unit  220  waits or pauses wireless transmission. Otherwise, the other one of the RF transceiving unit  241  and the network transceiving unit  242  will receive a response sent from the linked smart handheld device  10  (step S 535 ). Through the response sent out from the linked smart handheld device  10 , the processing unit  220  can know what to drive for wireless transmission. 
       FIG. 12  is a schematic diagram of the real-time multimedia signal transmission device in  FIG. 7  in use. When a plurality of smart handheld devices  10  are linked to the real-time multimedia signal transmission device  2 , one of the smart handheld devices  10  can utilize its built-in player module  104  to remotely control or actuate various functions of the real-time multimedia signal transmission device  2 . The other ones of the smart handheld devices  10  continuously receive the multimedia packet signal outputted by the real-time multimedia signal transmission device  2  for playing. The relative remote control procedure can refer from the description in  FIG. 6 , thus being not described again hereinafter. 
     In the disclosure, the real-time multimedia signal transmission device can utilize the display of the smart handheld device to watch captured images or listen to captured sounds, and provide a remote control function to the smart handheld device, so that the multimedia information captured by the real-time multimedia signal transmission device can be remotely monitored via the smart handheld device, making the real-time multimedia signal transmission device diversified in function. Thus, when using the real-time multimedia signal transmission device to capture multimedia information, the user does not need to always stay with the device but can monitor the captured images at a nearby or a distant location via the smart handheld device. 
     In the case of monitoring the captured images from a nearby location, such as in a car, the real-time multimedia signal transmission device may serve as an event data recorder, and a backseat passenger may monitor the captured images via a smart handheld device. In the case of monitoring the captured images from a remote location, such as at the site of a game or a show, the real-time multimedia signal transmission device may be mounted to a location closer to the site of the game or the show, and the user may conveniently watch the game or the show at a somewhat distant location via a smart handheld device.