TWI523522B - System of multimedia brocasting, method and apparatus thereof - Google Patents

Description

Multimedia broadcasting system, method and device thereof

The present invention relates to a multimedia broadcast system, apparatus and method, and more particularly to a multimedia broadcast system, apparatus and method based on mobile reception.

With the advancement of technology, people's demand for multimedia audio and video has also increased. After the digitalization of TV broadcast signals, people's demand for multimedia audio and video content such as watching TV is gradually increasing. For example, when moving on vehicles such as airplanes, buses, trains, etc., various kinds of audio and video content are viewed. Currently, digital television broadcast signals that can be received wirelessly include terrestrial digital broadcast signals or satellite digital television broadcast signals. When receiving these signals in the case of mobile, in addition to the capability of the mobile communication protocol conforming to the digital television broadcast signal to have Mobility Support, the hardware support of the receiving end has more certain requirements.

When the receiving end wants to receive the satellite TV broadcast signal in the mobile state, the receiving end needs to have an automatic orientation capability of the dish antenna or a flat phased array (Flat Phased-Array) antenna, so that the antenna has the highest gain for the satellite television broadcast signal. Let the receiving end have the best reception effect at any time. When the receiving end wants to receive the terrestrial digital broadcast signal, due to the Doppler Effect and multi-path caused by the mobile terminal, the receiving end usually needs to have a diversity antenna (Diversity Antenna). And the technology of Diversity Combining can get a video content that can be enjoyed by users.

At present, some existing aircraft or long-distance buses provide passengers' personal audio and video systems, allowing each passenger to freely choose what he wants to watch. The source of audio and video data of such a video system is a pre-stored video file and a digital television broadcast signal as described above. At present, there are several practices in the prior art for receiving digital television broadcast signals and transmitting them to individual passengers. The easiest way to do this is to use a digital TV set-box (STB) to receive a single program and transmit it to the passengers via a connection such as an AV terminal (Composite video conneetor). However, the disadvantage of this approach is that only one program can be sent at the same time, and passengers are not free to choose the program they want to watch. Moreover, although the AV terminal wiring is relatively easy, it will receive the limitation of image quality and the problem of signal attenuation.

The prior art also has methods for improving the above disadvantages. For example, a digital television conversion box can be configured for each passenger and these digital television conversion boxes share the receiving antenna. However, such a setup is very expensive and can result in very complicated wiring. A more eclectic approach is to preset the number of channels to be watched. A digital TV conversion box is set for each of these viewing channels, but the image content is still low in quality due to transmission through the AV terminal. If the same settings as above are used instead of High Definition Multimedia Interface (HDMI) transmission to improve image quality, the one-to-one characteristics of the HDMI cable can cause complicated wiring.

Another method is to convert the received digital broadcast signal to the network protocol. Internet Protocol Television (IPTV) is transmitted in the form of data packets. However, such a configuration method has the disadvantages of limited bandwidth and difficulty in construction and maintenance.

In view of this, the present invention provides a multimedia broadcast system, apparatus and method for receiving a plurality of channels and programs in a simple configuration and transmitting them to respective multimedia players in the system. Among them, the device is more capable of receiving actions.

The present invention provides a multimedia broadcast system, comprising: a plurality of multimedia signal bridges, respectively receiving a plurality of multimedia signals, respectively demodulating a plurality of multimedia signals to obtain a plurality of multimedia transport streams, and respectively modifying a plurality of multimedia transport streams to obtain a plurality of multimedia digital television signals, wherein each multimedia transmission stream includes at least one program, each digital television signal conforms to a digital television broadcasting standard; and a radio frequency mixer is coupled to a plurality of multimedia signal bridges, the radio frequency mixer Receiving a plurality of multimedia transmission streams and outputting a digital television radio frequency signal; a plurality of multimedia players wirelessly or wiredly connected to the radio frequency mixer, receiving the digital television radio frequency signals, and according to the terrestrial digital television broadcasting (DVB-T The standard gets and plays the show.

The above described features and advantages of the present invention will be more apparent from the following description.

FIG. 1 is a system block diagram of a multimedia broadcast system according to an embodiment of the invention. Referring to FIG. 1, the multimedia broadcast system 10 includes A plurality of multimedia signal bridges 101~10n, a radio frequency mixer (RF mixer) 110 and a plurality of multimedia players 120~12n. The plurality of multimedia signal bridges 101~10n respectively receive the plurality of multimedia signals MS1~MSn and respectively demodulate the plurality of multimedia signals MS1~MSn to obtain a plurality of multimedia transmission streams, and the audio and video formats thereof are in accordance with the second group of the dynamic image expert group. A Transport Stream (TS) format as specified in the Moving Picture Experts Group (MPEG-2), and then a plurality of multimedia transport streams are modulated into a plurality of multimedia digital television signals MTV1 to MTVn.

In this embodiment, the multimedia signals MS1~MSn conform to a digital television broadcasting standard, including a Digital Video Broadcasting-Satellite (DVB-S) standard, a Digital Satellite Service (DSS) standard, and a terrestrial digital television. Broadcast (Digital Video Broadcasting-Terrestrial, DVB-T) standard, Integrated Services Digital Broadcasting-Terrestrial (ISDB-T) standard, Digital Terrestrial Multimedia Broadcast (DTMB) standard or advanced The Advanced Television Systems Committee (ATSC) standard, multimedia digital television signals MTV1~MTVn comply with the terrestrial digital television broadcasting (DVB-T) standard, the Digital Video Broadcasting-Cable (DVB-C) standard. Quadrature Amplitude Modulation (QAM) standard, Terrestrial Integrated Digital Service Broadcasting (ISDB-T) standard, Terrestrial Digital Television Multimedia Broadcasting (DTMB) standard or Advanced Television Standards Committee (ATSC) standard, but the present invention It is not limited to the above embodiment.

The plurality of multimedia signals MS1~MSn respectively correspond to a plurality of channels, and n can be the total number of channels of the digital television broadcast signals receivable by a region, and can also be adjusted by the actual situation. In addition, the one channel includes at least one program, that is, one or more programs simultaneously transmitted by a television station in the same channel.

The RF mixer 110 is connected to the multimedia signal bridges 101~10n and receives a plurality of multimedia digital television signals MTV1~MTVn from the media signal bridges 101~10n. The RF mixer 110 mixes the multi-channel digital television signals MTV1~MTVn into one output, that is, the RF mixer 110 mixes the plurality of multimedia digital television signals MTV1~MTVn into one digital television radio frequency signal, which includes one or more channels. CH1~CHk. among them,. In addition, the k value is the total number of all programs in the multimedia digital television signals MTV1 to MTVn.

The multimedia players 120~12p are connected to the RF mixer 110, receive one or more channels CH1~CHk, and play the contents of one of the channels CH1~CHk according to the digital video broadcasting standard. Among them, the number of p is set according to the actual situation. For example, when the multimedia broadcast system 10 is placed on a vehicle, the size of p corresponds to the number of passenger seats.

The multimedia signal bridges 101~10n can receive the same type of digital television broadcast signals, and can also receive different types of digital television broadcast signals respectively, wherein the multimedia signal bridges 101~10n respectively follow the type of the received multimedia signals MS1~MSn. There are different ways to set it up. FIG. 2 is a functional block diagram of a multimedia signal bridge according to an embodiment of the invention. Referring to FIG. 2, in this embodiment, the multimedia signal MS1 is A digital television broadcast signal, such as a digital television broadcast signal conforming to the Satellite Digital Television Broadcasting Standard (DVB-S).

The multimedia signal bridge 201 includes a dish antenna unit 2010, an FM demodulator 2011, and a modulator 2012. The dish antenna unit 2010 has an automatic orientation function to receive the multimedia signal MS1 in the direction with the highest antenna gain. In another embodiment, the dish antenna unit 2010 is replaced by a flat phased-array antenna unit, and the present invention is not limited to the above embodiment. The FM demodulator 2011 is connected to the dish antenna unit 2010, adjusts the frequency of the received multimedia signal MS1, receives the multimedia signal MS1 from the dish antenna unit 2010, and demodulates the multimedia signal MS1 to obtain a multimedia transmission stream, and the modulator 2012 uses the multimedia The multimedia stream television signal MTV1 is generated after the transmission stream is modulated.

On the other hand, since the digital television broadcast signal is easily moved during the movement due to the change of the relative position of the moving speed direction and the signal source, the Doppler effect is more likely to cause the signal multipath effect due to the surrounding terrain and the building in the area, and the space. Space Diversity, or antenna diversity, is used to solve the above problems. At the signal receiving end, spatial diversity uses a plurality of receiving antennas to merge through different paths, and signals having different degrees of attenuation and delay are used to achieve good reception.

FIG. 3A is a functional block diagram of a multimedia signal bridge according to another embodiment of the present invention. Referring to FIG. 3A, the multimedia signal bridge 201 includes an accessory antenna 3011, a main antenna 3013, a diversity combining demodulator 3016, and a modulator 3015. The diversity combining demodulator 3016 is connected to the main antenna The 3013 and the accessory antenna 3011, and using the antenna diversity technology, receive the multimedia signal MS1, demodulate the multimedia signal MS1, and obtain a multimedia transmission stream. The modulator 3015 is coupled to the diversity combining demodulator 3016, which modulates the multimedia transport stream to produce a multimedia digital television signal MTV1. The RF mixer 110 is coupled to the modulator 3015 for receiving the multimedia digital television signal MTV1. The radio frequency mixer 110 can be referred to the description of FIG. 1 , and details are not described herein again. In addition, the diversity combining demodulator 3016 can be designed to connect two or more sets of accessory antennas, so that a better reception effect of the multimedia signal MS1 can be obtained, and thus the number of the accessory antennas can be adjusted by the actual situation. The invention is not limited to the above embodiment.

FIG. 3B is a functional block diagram of a multimedia signal bridge according to another embodiment of the present invention. Referring to FIG. 3B, the multimedia signal bridge 201 includes an accessory antenna 3011, an auxiliary FM demodulator 3012, a main antenna 3013, a main FM demodulator 3014, and a modulator 3015. The satellite antenna 3011 receives the multimedia signal MS1 at a specific frequency. The specific frequency is also the transmission frequency of the multimedia signal MS1. The auxiliary FM demodulator 3012 is connected to the satellite antenna 3011, receives the multimedia signal MS1 from the satellite antenna 3011, and demodulates to obtain a Diversity Slave Output (DSO) signal.

The main antenna 3013 and the satellite antenna 3011 receive the same multimedia signal MS1. The main FM demodulator 3014 is connected to the main antenna and receives the multimedia signal MS1, and demodulates the multimedia signal MS1 to obtain a main output signal. The main FM demodulator 3014 uses antenna diversity technology to divide and combine the auxiliary output signal DSO and the main output signal to obtain multimedia transmission. The stream, modulator 3015 modulates the multimedia transport stream to produce a multimedia digital television signal MTV1. The RF mixer 110 is coupled to the modulator 3015 for receiving the multimedia digital television signal MTV1. The RF mixer 110 can be referred to the description of FIG. 1, and details are not described herein again.

It should be noted that the multimedia signal bridge 301 and the RF mixer 110 in FIG. 3 may be separately and independently arranged, or may be integrated into a single device. When the multimedia signal bridge 301 and the radio frequency mixer 110 are integrated into a single device, a plurality of multimedia signal bridges can be simultaneously set in the independent device to receive a plurality of multimedia signals to provide more programs and channels, as shown in the figure. The multimedia signal bridges 101 to 10n shown in FIG. 1 are connected to the radio frequency mixer 110. The multimedia signal bridges may be arranged in the same manner as the multimedia signal bridge 201, or may be adjusted according to the type of the multimedia signal received by the multimedia signal bridge 201, and the present invention is not limited to the above.

FIG. 4 is a block diagram of a system of a multimedia broadcast system according to an embodiment of the invention. The coupling relationship of the components in this embodiment is the same as that of FIG. 1 and therefore will not be described herein. Referring to FIG. 4, the multimedia signal bridges 401 to 403 respectively receive different digital television broadcast signals. In this embodiment, the multimedia signal bridge 401 is configured to receive a satellite digital television broadcast signal conforming to the DVB-S/DSS standard, that is, the multimedia signal MS10. The multimedia signal bridge 402 and the multimedia signal bridge 403 receive the multimedia signal MS11 and the multimedia signal MS12, wherein the multimedia signal MS11 and the multimedia signal MS12 are digital television broadcast signals conforming to DVB-T, ISDB-T, DTMB or ATSC.

After the dish antenna unit 4011 of the multimedia signal bridge 401 receives the multimedia signal MS10, the FM demodulator 4012 demodulates the multimedia signal MS10 into a multimedia transmission stream, and the modulator 4014 converts the multimedia transmission stream into a multimedia digital television signal MTV1, and then Output to the RF mixer 410.

The multimedia signal bridge 402 has an antenna diversity technique set for mobile reception, and the embodiment illustrated in FIG. 3A or FIG. 3B can be described in detail. The multimedia signal bridge 403 receives the multimedia signal MS12 only through the antenna 4031, and demodulates the multimedia signal MS12 by the FM demodulator 4032 connected to the antenna to obtain a multimedia transmission stream, and the multimedia transmission stream is modulated by the modulator 4034. , get the multimedia digital TV signal MTV3.

With continued reference to FIG. 4, the multimedia broadcast system 40 further includes a multimedia server 404 in this embodiment. The multimedia server 404 is coupled to the RF mixer 410, which stores a variety of audio and video content, such as movies, still images, music, or from the National Television System Committee (NTSC) or the progressive phase-inversion system ( Phase Alternating Line, PAL) The image content received by an analog TV broadcast signal.

The multimedia server 404 organizes the stored video and audio content into one or more programs, such as a movie carousel of the same type or a photo wheel with music, and the like is compressed into the same format as the aforementioned multimedia transport stream. The modulator 406 then tunes the multimedia transport stream into a multimedia digital television signal MTV4 and sends it to the RF mixer 410 for processing by the RF mixer 410. In the present embodiment, the multimedia transport stream conforms to the transport stream format in the MPEG-2 standard, but the present invention is not limited to the above embodiment.

The radio frequency mixer 410 receives the multimedia digital television signals MTV1~MTV4 and combines them on a single coaxial cable (or antenna) to output a digital television radio frequency signal, and the digital television radio frequency signal includes one or more channels CH1~CHk. It is worth noting that since the multimedia transport stream in this embodiment is a transport stream format in MPEG-2, it is re-tuned to conform to DVB-T, DVB-C, QAM, ISDB-T, DTMB or ATSC. Before the standard multimedia digital TV signal MTV1~MTV4, there is no need to convert the video format and encoding.

However, in another embodiment, when the audio and video format of the multimedia transport stream does not match the video format requirement in the digital video broadcast standard, the modulators 4014, 4026, 4034, 406 further include a converting unit (not shown), and convert After the audio and video formats of the respective programs in the multimedia transmission stream are in accordance with the audio and video format requirements of the digital television broadcasting standard, the modulators 4014, 4026, 4034, 406 then convert the respective programs in the multimedia transmission stream into multimedia digital television signals MTV1 to MTV4.

Referring to FIG. 4, the multimedia player 421 includes a demodulator 4211, a video decoder 4212, a display unit 4213, and a channel switching unit 4214. The demodulator 4211 receives one of the channels CH1 to CHk of the digital television radio frequency signal from the radio frequency mixer 410, denoted as CHi, and demodulates the channel CHi as the channel transport stream CS according to the DVB standard. The video decoder 4212 is connected to the demodulator 4211, receives the channel transport stream CS and decodes the channel transport stream CS into the video material VC. The output unit 4213 is connected to the video decoder 4212, receives the video material VC and displays the played video material VC. The channel switching unit 4214 is connected to the demodulator 4214 to receive the operation signal OP. (For example, generated by the user selecting a channel), and controlling the demodulator 4211 to switch channels (one of the channels CH1 to CHk) according to the operation signal OP.

The other multimedia players 422~42p in the multimedia broadcast system 40 have similar components and connection relationships with the multimedia player 421, and are not described here. However, it is worth noting that the multimedia players 421~42p can be connected to the radio frequency mixer 410 by wire or wirelessly, and set according to actual conditions. In this embodiment, since the channels CH1~CHk are modulated in a DVB-T manner, that is, a digital video broadcasting standard suitable for wireless transmission, and only a coaxial cable connection to the multimedia player 421 is required for wired transmission. ~42p is connected to the RF mixer 410.

The invention also provides a multimedia broadcasting method. FIG. 5 is a flow chart showing the steps of a multimedia broadcast method according to an embodiment of the invention. Referring to FIG. 5, first, at step S101, a plurality of multimedia signals are received, and a plurality of multimedia signals are respectively demodulated to obtain a plurality of multimedia transmission streams, wherein the plurality of multimedia signals conform to satellite digital television broadcasting (DVB-S/DSS) Or terrestrial digital television broadcasting (DVB-T/ISDB-T/DTMB/ATSC) standards, and multiple multimedia transmission streams each include one or more programs. Then, in step S102, the plurality of multimedia transport streams are respectively modulated to generate a plurality of multimedia digital television signals, wherein each of the multimedia digital television signals conforms to the digital television broadcast, that is, conforms to DVB-T, DVB-C, QAM, One of the ISDB-T, DTMB or ATSC standards. Then, in step S103, the radio frequency mixes the plurality of multimedia digital television signals to generate a digital television radio frequency signal. For detailed implementation of the method, reference may be made to the description of the above embodiments, and no further details are provided herein.

In summary, the present invention provides a multimedia broadcast system, method and apparatus thereof, which use multiple multimedia signal bridges to receive signals of a plurality of digital television channels. Taking digital television broadcasting in Taiwan as an example, the first multimedia signal is bridged. The device receives a video channel of 533 MHz, wherein there are three television programs; the second multimedia signal bridge receives a public video channel of 545 MHz, wherein there are three television programs; and the third multimedia signal bridge receives a video channel of 557 MHz, wherein There are four TV programs; the fifth multimedia signal bridge receives the 569MHz public video channel, which has a high-definition (HD) TV program; the sixth multimedia signal bridge receives the 581MHz video channel, three of which A TV program and a broadcast program; the seventh multimedia signal bridge receives a 597 MHz video channel, of which there are three television programs. The multimedia signal bridge re-modulates and transmits all the programs in each channel to each user in the system.

In addition, if the multimedia signal bridge has used the antenna diversity technology, the user's multimedia player only needs to have a general antenna but still obtains good signal quality on the mobile, which greatly reduces the cost of system construction. The user's multimedia player can receive multiple high-quality channels that are the same as the original TV station's transmission signal through wireless or wired, which maintains the user's viewing quality while avoiding complicated wiring problems. Although the present invention is mainly directed to a multimedia broadcasting system applied to a vehicle, the present invention can also be applied to the construction of a multimedia system in a hotel, a large public building, and the like, and has the above-mentioned numerous advantages in the application of these occasions.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art does not deviate. In the spirit and scope of the present invention, the scope of protection of the present invention is defined by the scope of the appended claims.

10, 40‧‧‧Multimedia Broadcasting System

101~10n, 201, 401~403‧‧‧Multimedia signal bridge

110,410‧‧‧RF mixer

120~12p, 421~42p‧‧‧Multimedia player

2010, 4011‧‧‧ dish antenna unit

2011, 4032‧‧ ‧ FM demodulator

2012, 3015, 406, 4014, 4026, 4034‧‧ ‧ modulator

3011, 4021‧‧‧Attach antenna

3016‧‧‧Divided and demodulator

3012, 4022‧‧‧Auxiliary FM Demodulator

3014, 4024‧‧‧ main FM demodulator

3013, 4023‧‧‧ main antenna

4031‧‧‧Antenna

404‧‧‧Multimedia server

4211‧‧‧ demodulator

4212‧‧‧Video decoder

4213‧‧‧Output unit

4214‧‧‧Channel switching unit

CH1~CHk, CHi‧‧ channel

CS‧‧‧ channel transport stream

VC‧‧‧ audio and video materials

MS1~MSn, MS10~MS12‧‧‧ multimedia signal

MTV1~MTVn‧‧‧Multimedia digital TV signal

DSO‧‧‧ diversity accessory output signal

OP‧‧‧ operation signal

S101~S103‧‧‧ Process steps

FIG. 1 is a system block diagram of a multimedia broadcast system according to an embodiment of the invention.

FIG. 2 is a functional block diagram of a multimedia signal bridge according to an embodiment of the invention.

FIG. 3A is a functional block diagram of a multimedia signal bridge according to another embodiment of the present invention.

FIG. 3B is a functional block diagram of a multimedia signal bridge according to another embodiment of the present invention.

FIG. 4 is a block diagram of a system of a multimedia broadcast system according to an embodiment of the invention.

FIG. 5 is a flow chart showing the steps of a multimedia broadcast method according to an embodiment of the invention.

10‧‧‧Multimedia Broadcasting System

101~10n‧‧‧Multimedia Signal Bridge

110‧‧‧RF Mixer

120~12p‧‧‧Multimedia player

CH1~CHk‧‧ Channel

MS1~MSn‧‧‧Multimedia signal

MTV1~MTVn‧‧‧Multimedia digital TV signal

Claims (13)

A multimedia broadcast system includes: a plurality of multimedia signal bridges, respectively receiving a plurality of multimedia signals, respectively demodulating a plurality of multimedia signals to obtain a plurality of multimedia transport streams, and respectively modifying a plurality of multimedia transport streams to obtain a plurality of multimedia streams a digital television signal, wherein each multimedia transmission stream includes at least one program, each digital television signal conforms to a digital television broadcasting standard; a radio frequency mixer is coupled to a plurality of multimedia signal bridges, the radio frequency mixer receiving a plurality of a multimedia digital television signal, and a plurality of multimedia digital television signals are combined to output a digital television radio frequency signal; a plurality of multimedia players are wirelessly or wiredly connected to the radio frequency mixer, receive the digital television radio frequency signal, and according to the digital television The program is obtained and played by the broadcast standard. The multimedia broadcasting system according to claim 1, wherein the digital television broadcasting standard is selected from the group consisting of terrestrial digital television broadcasting (DVB-T) standard, cable digital television broadcasting (DVB-C) standard, and quadrature amplitude modulation. (QAM) Standard, Ground Integrated Digital Service Broadcast (ISDB-T) standard, Terrestrial Digital Television Multimedia Broadcasting (DTMB) standard, and Advanced Television Standards Committee (ATSC) standards. The multimedia broadcast system of claim 1, wherein one of the plurality of multimedia signal bridges comprises: an antenna receiving a first multimedia signal; and an FM demodulator connected to the antenna; And receiving the first multimedia signal from the antenna, demodulating the first multimedia signal to obtain a first multimedia a transport stream; and a modulator connected to the FM demodulator, receiving the first multimedia transport stream from the FM demodulator, modulating the first multimedia transport stream to obtain a first multimedia Digital TV signal. The multimedia broadcast system of claim 1, wherein one of the plurality of multimedia signal bridges comprises: an accessory antenna that receives a second multimedia signal at a specific frequency; and a primary antenna Receiving the second multimedia signal; the diversity combining demodulator is connected to the primary antenna and the accessory antenna, and demodulating the second multimedia signal to obtain a second multimedia transmission stream; A modulator is coupled to the diversity combining demodulator, receives the second multimedia transport stream, and modulates the second multimedia transport stream to obtain a second multimedia digital television signal. The multimedia broadcast system of claim 1, wherein one of the plurality of multimedia signal bridges comprises: an accessory antenna that receives a second multimedia signal at a specific frequency; and an auxiliary FM demodulator Connecting the accessory antenna, receiving the second multimedia signal from the accessory antenna, and demodulating the second multimedia signal to obtain a diversity accessory output signal; and a primary antenna receiving the second at the specific frequency a multimedia signal; a main FM demodulator coupled to the main antenna and the auxiliary FM demodulator, receiving the diversity auxiliary output signal and the second multimedia signal from the main antenna, demodulating the second The multimedia signal is obtained to obtain a main output signal, and the diversity output signal and the main output signal are combined and obtained. a second multimedia transport stream; and a modulator connected to the main FM demodulator, receiving the second multimedia transport stream, modulating the second multimedia transport stream to obtain a second multimedia Body digital TV signal. The multimedia broadcast system of claim 1, wherein the multimedia player comprises: a demodulator, receiving the digital television radio frequency signal, and demodulating the digital television radio frequency signal for transmission by a digital channel according to the digital television broadcast standard a video and audio decoder connected to the demodulator, receiving the channel transport stream and decoding the channel transport stream to obtain the program; an output unit connecting the video decoder to receive and play the program; and a channel switching unit, The demodulator is connected to receive an operation signal to control the demodulator to switch to receive the digital television radio frequency signal. The multimedia broadcast system of claim 1, further comprising: a multimedia server, compressing the at least one third multimedia signal into a third multimedia transport stream; and a modulator connected to the multimedia The server receives the third multimedia transport stream, modulates the third multimedia transport stream to obtain a third digital television signal, and transmits the third digital television signal to the radio frequency mixer. A multimedia broadcasting method includes: a. receiving a plurality of multimedia signals, and separately demodulating a plurality of multimedia signals to respectively obtain a plurality of multimedia transmission streams, wherein each multimedia Each of the transport streams includes at least one program; b. respectively modulating the plurality of multimedia transport streams to respectively generate a plurality of multimedia digital television signals, wherein each of the media digital television signals conforms to a digital television broadcast standard; and c. A multimedia digital television signal that produces a digital television radio frequency signal. The multimedia broadcasting method according to claim 8, wherein the digital television broadcasting standard is selected from the group consisting of terrestrial digital television broadcasting (DVB-T) standard, cable digital television broadcasting (DVB-C) standard, and quadrature amplitude modulation. (QAM) Standard, Ground Integrated Digital Service Broadcast (ISDB-T) standard, Terrestrial Digital Television Multimedia Broadcasting (DTMB) standard, and Advanced Television Standards Committee (ATSC) standards. The multimedia broadcasting method of claim 8, wherein the step a comprises: receiving one of the plurality of multimedia signals at a specific frequency through an antenna; and demodulating one of the plurality of multimedia signals, To obtain one of a plurality of multimedia transport streams. The multimedia broadcasting method of claim 8, wherein the step a comprises: receiving one of the plurality of multimedia signals at a specific frequency through an accessory antenna; receiving the complex number at the specific frequency through a primary antenna One of the multimedia signals; One of the plurality of multimedia signals is divided and demodulated to obtain one of a plurality of multimedia transport streams. The multimedia broadcasting method of claim 8, wherein the step a comprises: receiving one of the plurality of multimedia signals at a specific frequency through an accessory antenna; and demodulating one of the plurality of multimedia signals, Obtaining a diversity accessory output signal; receiving, by a primary antenna, one of the plurality of multimedia signals at the specific frequency; demodulating one of the plurality of multimedia signals to obtain a primary output signal; and dividing and combining The diversity auxiliary output signal and the main output signal are one of a plurality of multimedia transmission streams. The multimedia broadcasting method of claim 8, further comprising: d. receiving the digital television radio frequency signal in a wireless or wired manner, and demodulating the digital television radio frequency signal into a channel transmission stream according to the digital television broadcasting standard; Decoding the channel transport stream to generate the program; f. playing the program; and g. receiving an operational signal and switching the digital television radio frequency signal in accordance with the operational signal.