TWI542221B - Video transmission device and system thereof - Google Patents

Description

Video transmission device and system thereof

The present invention relates to an audio-visual transmission device and a system thereof, and more particularly to an audio-video transmission device for connecting a multimedia device to transmit a signal to a video transmission device of a digital television and a system thereof.

With the advancement of multimedia audio-visual technology, people's lives are closely related to multimedia audio-visual technology, such as teaching environment, monitoring environment, concerts, presentations, advertisements or video walls, etc. Therefore, the multimedia audio-visual technology application At least one multimedia device and a plurality of audio and video output devices are often disposed in the environment, wherein the multimedia device is, for example, a notebook, and the audio and video output device is, for example, a display screen and/or a speaker.

However, when staff set up multimedia devices and audio-visual output devices, the staff often encounter the following problems, which makes it costly for the staff to arrange multimedia devices and audio-visual output devices. For example, the staff places multiple audio-visual output devices and multimedia devices. After pre-scoring the position, the staff needs to set the communication address of multiple audio-video output devices and multiple multimedia devices. The communication address is, for example, a dynamic network address, so that the staff must spend considerable time setting the communication address. .

Furthermore, when the staff completes the communication address setting of the AV output device and the multimedia device, if the staff member wants to change the connection status between the AV output device and the multimedia device, for example, to change the communication address of the AV output device, the staff needs to The connection condition is reset, whereby the video output device and the multimedia device will spend time reconnecting.

The present invention provides an audio-visual transmission device and a system thereof, wherein the audio-visual transmission device is connected to the multimedia device to receive the multimedia signal, and the audio-visual transmission device transmits the multimedia signal to the television signal through the modulation unit, and transmits the digital signal to the digital television to make the digital signal A reserved channel of the television outputs audio and video programs, thereby improving the efficiency and convenience of the audio and video transmission system.

The invention provides an audio-visual transmission device, which is suitable for communicating with a plurality of digital televisions. Each digital television has a receiving component, and the audio-visual transmission device comprises a connection interface, a processing unit, a modulation unit and a transmission unit. The connection interface is used to connect to a multimedia device, and the multimedia device is used to provide a multimedia signal. The processing unit is coupled to the connection interface for processing or computing the multimedia signal. The modulation unit is coupled to the processing unit and configured to match the multimedia signal to the digital television to modulate the plurality of television signals. The transmission unit is coupled to the modulation unit for transmitting the television signals. The modulating unit modulates the multimedia signal into a plurality of television signals corresponding to the number of the plurality of televisions according to the number of the digital televisions, and each television signal corresponds to a receiving channel of one of the digital televisions, so that each When the digital television receives one of the corresponding television signals through the receiving component, the digital television combinations form a composite image as a multimedia signal.

The invention provides an audio-visual transmission system, which comprises a plurality of digital televisions and an audio-visual transmission device. Each digital television has a receiving component. The video transmission device includes a connection interface, a processing unit, a modulation unit and a transmission unit. The connection interface is used to connect to a multimedia device, and the multimedia device is used to provide a multimedia signal. The processing unit is coupled to the connection interface for processing or computing the multimedia signal. The modulation unit is coupled to the processing unit and configured to match the multimedia signal to the digital television to modulate the plurality of television signals. The transmission unit is coupled to the modulation unit for transmitting the television signals. The modulating unit modulates the multimedia signal into a plurality of television signals corresponding to the number of the plurality of televisions according to the number of the digital televisions, and each television signal corresponds to a receiving channel of one of the digital televisions, so that each When the digital television receives one of the corresponding television signals through the receiving component, the digital televisions The combination forms a composite image as a multimedia signal.

The specific means of the present invention is to utilize an audio-visual transmission system, which comprises a plurality of digital televisions and a video transmission device connected to the multimedia device, and the audio-visual transmission device transmits the multimedia signals into a plurality of television signals through the modulation unit, and transmits the signals to the digital television. In order to enable a reserved channel of the digital television to output audio and video programs, thereby improving the efficiency and convenience of the audio and video transmission system.

The above summary and the following examples are intended to be illustrative of the invention and the embodiments of the invention.

1, 2, 3‧ ‧ audio and video transmission system

9‧‧‧Multimedia device

10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h‧‧‧ digital TV

100a, 100b, 100c, 100d‧‧‧ antenna

102a, 102b, 102c, 102d‧‧‧ demodulation unit

104a, 104b, 104c, 104d‧‧‧ decoding unit

12, 12a‧‧‧ audio and video transmission device

120‧‧‧Connection interface

122‧‧‧Processing unit

124‧‧‧Modulation unit

126, 126a‧‧‧ transmission unit

1260‧‧‧Wireless RF components

1262‧‧‧Wired transmission interface

14‧‧‧ transmission line

1 is a functional block diagram of an audio and video transmission system according to an embodiment of the present invention.

FIG. 2 is a schematic functional block diagram of a video and audio transmission system according to another embodiment of the present invention.

FIG. 3 is a schematic functional block diagram of an audio and video transmission system according to another embodiment of the present invention.

1 is a functional block diagram of an audio and video transmission system according to an embodiment of the present invention. Please refer to Figure 1. An audio-video transmission system 1 includes a plurality of digital televisions 10a, 10b, 10c, 10d and an audio-visual transmission device 12. In practice, the audio-visual transmission system 1 is applied to, for example, a multi-screen advertisement in a video wall, a hypermarket or a public place, a multi-screen display of a teaching environment, a multi-screen display of a stock exchange, a multi-screen display of a concert or a presentation, etc. This embodiment does not limit the operational aspect of the AV transmission system 1.

In detail, each of the digital televisions 10a, 10b, 10c, and 10d has a receiving component. For convenience of description, the receiving component of the present embodiment is the antenna 100a, 100b, 100c, 100d. In other embodiments, the receiving component is, for example, The TV Cable Interface, this embodiment does not limit the aspect of the receiving component.

In practice, the digital televisions 10a, 10b, 10c, 10d include a demodulation unit 102a, 102b, 102c, 102d and a decoding unit 104a, 104b, 104c, 104d, and The tuner units 102a, 102b, 102c, 102d receive the local digital television signals, and the local digital television signals are decoded by the decoding units 104a, 104b, 104c, 104d to output the digital televisions 10a, 10b, 10c, 10d to the local TV programs, such as the Taiwanese wireless TV industry, use the DVB-T format as the broadcast specifications for digital TVs 10a, 10b, 10c, 10d, so that some channels of digital TVs 10a, 10b, 10c, 10d can output local TV programs. For example, digital televisions 10a, 10b, 10c, and 10d can output programs broadcast by Taiwan TV companies, Chinese TV companies, China Television Corporation, or private national television companies. Of course, some of the digital televisions 10a, 10b, 10c, and 10d still have reserved channels, and the reserved channels have no program content to output.

For convenience of description, the present embodiment uses the reserved channel as the channel for transmitting the audio and video program by the video and audio transmission device 12, so that the digital televisions 10a, 10b, 10c, and 10d output the audio and video programs transmitted by the video and audio transmission device 12, in other implementations. For example, the video transmission system 1 can also use the television signal technology of the cover station to enable the digital televisions 10a, 10b, 10c, and 10d to output the audio and video programs transmitted by the audio and video transmission device 12. This embodiment does not limit the operation of the audio and video transmission system 1. Aspect. In addition, the present embodiment is described by four digital televisions 10a, 10b, 10c, and 10d. In other embodiments, the number of digital televisions 10a, 10b, 10c, and 10d may be two, three, five, and eight. Alternatively, the number of the digital televisions 10a, 10b, 10c, 10d is not limited in this embodiment.

The video transmission device 12 includes a connection interface 120, a processing unit 122, a modulation unit 124, and a transmission unit 126. In practice, the processing unit 122 is coupled between the connection interface 120 and the modulation unit 124, and the modulation unit 124 is coupled to the transmission unit 126. Therefore, the AV transmission device 12 is connected to the multimedia device 9 through the connection interface 120, thereby using the multimedia device. 9 can be transmitted through the video transmission device 12 to wirelessly transmit the multimedia signal to the digital televisions 10a, 10b, 10c, 10d. The other audio and video transmission device 12 can be a small-sized and lightweight USB stick or other portable electronic device. This embodiment does not limit the aspect of the audio-visual transmission device 12.

In detail, the connection interface 120 is used to connect to a multimedia device 9, and the multimedia device 9 is, for example, a desktop computer, a tablet computer, a notebook computer, a mobile communication device, or a A personal digital assistant (PDA) or the like is used to provide a multimedia signal. This embodiment does not limit the aspect of the multimedia device 9. In practice, the connection interface 120 conforms to a transport stream (TS), a universal sequence bus, and/or an interface specification of an Ethernet. This embodiment does not limit the aspect of the interface 120.

For example, the connection interface 120 is, for example, a universal serial bus, so that the audio-visual transmission device 12 is connected to the general-purpose serial bus of the notebook through the universal serial bus, so that the user can operate the notebook to play a video program. The audio and video of the video program will convert the multimedia signal of the MPEG2 or H.264 stream and transmit it to the processing unit 122 for processing through the connection interface 120. This embodiment does not limit the operation of the connection interface 120 and the multimedia device 9. .

The processing unit 122 is coupled to the connection interface 120 for processing or computing the multimedia signal, and transmitting the processed or processed multimedia signal to the modulation unit 124. In practice, the processing unit 122 is, for example, a central processing unit or a microprocessor. This embodiment does not limit the aspect of the processing unit 122.

The modulating unit 124 is coupled to the processing unit 122 and configured to modulate the multimedia signals to the plurality of televisions 10a, 10b, 10c, and 10d to modulate the plurality of television signals. In practice, the modulation unit 124 is, for example, a digital communication modulation chip, and the digital communication modulation chip can be used for 1080P high-definition digital video stream information transmission, and has the characteristics of high-bandwidth, long-distance transmission, anti-interference and encryption. This embodiment does not limit the aspect of the modulation unit 124.

The modulating unit 124 modulates the multimedia signal into a plurality of television signals corresponding to the number of the plurality of televisions 10a, 10b, 10c, and 10d according to the number of the digital televisions 10a, 10b, 10c, and 10d, and each of the television signals corresponds to a receiving channel of one of the digital televisions 10a, 10b, 10c, 10d, such that each of the digital televisions 10a, 10b, 10c, 10d receives one of the corresponding television signals through the antennas 100a, 100b, 100c, 100d. The digital televisions 10a, 10b, 10c, and 10d are combined to form a composite image as a multimedia signal. Another modulation unit 124 loads each television signal into a transmission. The frequency band is such that the transmission unit 126 transmits the television signals through the transmission bands for transmission to the digital televisions 10a, 10b, 10c, 10d. In detail, the modulation unit 124 adopts a standard digital television modulation mode to support various mainstream digital television specifications worldwide, and thus the digital televisions 10a, 10b, 10c, and 10d also have demodulation units 102a, 102b, 102c, and 102d as standards. The receiving modulator 124 can transmit the television signal to the digital televisions 10a, 10b, 10c, and 10d through the spread spectrum communication technology, thereby reducing signal attenuation and multipath interference during communication, so Improve transmission efficiency and communication quality. The modulating unit 124 can modulate and convert the multimedia signal into a plurality of television signals, wherein the television signals conform to a Digital Video Broadcasting (DVB), an Integrated Services Digital Broadcasting (ISDB), an advanced Advanced Television Systems Committee (ATSC), Terrestrial Digital Multimedia TV/Handle Broadcasting (DTMB, DMB-TH), Quadrature Amplitude Modulation (QAM) and/or Or a signal specification for China Mobile Multimedia Broadcasting (CMMB).

It is worth mentioning that the multimedia signal is modulated into a plurality of television signals via the modulation unit 124, wherein one television signal will be transmitted to the twenty-first channel corresponding to the digital television 10a, and the other television signal will be transmitted to the corresponding digital television. The twenty-fifth channel of 10b, another TV signal will be transmitted to the thirty-fifth channel corresponding to the digital television 10c, and the other one will be transmitted to the fifth channel corresponding to the digital television 10d, among which the digital television The twenty-first channel, the twenty-fifth channel, the thirty-fifth channel, and the fifth channel of 10a, 10b, 10c, and 10d are reserved channels. In other embodiments, the television signals can be The same channel transmitted to the digital televisions 10a, 10b, 10c, 10d, for example, these television signals can be transmitted to the twenty-first channels of the digital televisions 10a, 10b, 10c, 10d, and the embodiment does not limit the multimedia signals. Modulated into a plurality of television signals via the modulation unit 124, and the television signals are transmitted to the reserved channels of the digital televisions 10a, 10b, 10c, 10d. Working posture.

In addition, the modulating unit 124 can modulate a plurality of television signals according to the number of the digital televisions 10a, 10b, 10c, and 10d. For example, the modulating unit 124 of the embodiment modulates four television signals, wherein each television signal indicates a program video and audio. The partial picture, the television signal of this embodiment indicates a quarter of a program video, and in other embodiments, the number of digital televisions 10a, 10b, 10c, 10d is, for example, eight, then the modulation unit 124 modulates eight The television signals, wherein each of the television signals indicates an eighth of a program video, the embodiment does not limit the modulation unit 124 to modulate the plurality of television signals.

It should be noted that the modulation unit 124 may have a frequency band table (not shown), and the frequency band table (not shown) is used to indicate that the plurality of television signals correspond to the relationship of the plurality of digital televisions 10a, 10b, 10c, and 10d, for example, modulation. The unit 124 can use the 420 MHz frequency band to transmit the television signal of the corresponding digital television 10a to the digital television 10a through the transmission unit 126, and the modulation unit 124 can use the 450 MHz frequency band to transmit the television signal of the corresponding digital television 10b to the digital transmission unit 126 to the transmission unit 126. For the digital television 10b, the modulation unit 124 can use the 460MHz and 480MHz frequency bands to transmit the television signals corresponding to the digital televisions 10c and 10d to the digital televisions 10c and 10d through the transmission unit 126, respectively.

In other embodiments, a band table (not shown) may also be used to indicate that each digital television 10a, 10b, 10c, 10d corresponds to a plurality of television signals, for example, the digital televisions 10a, 10b, 10c, 10d have fifteen. a channel broadcasted locally by the local country, and the band table (not shown) can avoid the channels broadcasted by the local country, and modulate and transmit the plurality of television signals in the 420MHz, 450MHz, 460MHz and 480 MHz bands, respectively. The 420MHz, 450MHz, 460MHz and 480 MHz bands are the 21st channel, the 25th channel, the 35th channel and the fifth channel corresponding to each digital TV 10a, 10b, 10c, 10d respectively. Therefore, the user can switch the digital televisions 10a, 10b, 10c, and 10d to the twenty-first channel, the twenty-fifth channel, the thirty-fifth channel, and the fifth channel, respectively, so that the synthesized image is displayed. Displayed on the digital televisions 10a, 10b, 10c, 10d, of course, when the user can switch the digital televisions 10a, 10b, 10c, 10d to the twenty-first channels, respectively, the digital televisions 10a, 10b, 10c, 10d will be displayed. The same image frame. This embodiment does not limit the aspect and operation of the modulation unit 124 and the band table. The transmission unit 126 is coupled to the modulation unit 124 for transmitting the television signals. In a practical manner, the transmission unit 126 is, for example, a radio frequency component 1260 and/or a wired transmission interface 1262. For convenience of description, the transmission unit 126 of the embodiment is described by the radio frequency component 1260. The embodiment does not limit the transmission unit 126. Aspect. For example, the radio frequency components 1260 are, for example, radio frequency antennas 100a, 100b, 100c, 100d, whereby the television signals are transmitted to the digital televisions 10a, 10b, 10c, 10d through the radio frequency components 1260.

When each of the digital televisions 10a, 10b, 10c, and 10d receives one of the corresponding television signals through the antennas 100a, 100b, 100c, and 100d, a receiving channel of each of the digital televisions 10a, 10b, 10c, and 10d will play correspondingly. One of the television signals, and a composite image is displayed on the digital televisions 10a, 10b, 10c, 10d.

In practice, the multimedia device 9 provides a multimedia signal with sound and video encoded by the encoding unit to conform to the MPEG2 or H.264 format for conversion to a streamed multimedia signal, and the streamed multimedia signal is connected via the interface 120. The transmission unit 124 transmits the coded converted multimedia signal to a TV signal such as ATSC, DVB-T, ISDB-T or DMB-TH, and converts it into a predetermined one via the transmission unit 126. The RF signal in the frequency band is then transmitted by the RF antennas 100a, 100b, 100c, 100d, and the digital televisions 10a, 10b, 10c, 10d receive the TV signal from the AV transmission device 12, and then the TV with sound and video can be restored. Signal to output audio and video programs.

For example, the multimedia device 9 can provide at least one multimedia signal. The multimedia signal is, for example, a streaming signal of a food program, a sports program, a music program, a news program, or a person-interview program. For example, the user operates a notebook to play a piece of food and video. The program, and the multimedia device 9 transmits a multimedia signal, such as a pizza, to the video transmission device 12, and the multimedia signal is modulated into four by the modulation unit 124. a television signal, wherein each television signal is, for example, an intermediate frequency (IF) signal indicating that a quarter pizza image is displayed, and the intermediate frequency signals are transmitted to each of the digital televisions 10a, 10b, 10c, 10d. When the digital televisions 10a, 10b, 10c, and 10d receive the corresponding television signals through the antennas 100a, 100b, 100c, and 100d, a receiving channel of each of the digital televisions 10a, 10b, 10c, and 10d plays a corresponding television signal. A composite pizza image will be displayed on these digital televisions 10a, 10b, 10c, 10d, as shown in FIG. This embodiment does not limit the operation and aspect of the AV transmission system 1.

Based on the above, the setting of the complicated communication address is not required between the AV transmission device 12 and the digital televisions 10a, 10b, 10c, and 10d, whereby the audio-video transmission device 12 and the digital televisions 10a, 10b, 10c, and 10d can be easily completed. In other embodiments, the audio-visual transmission system 1 can also be used in a multi-screen advertisement of a video wall, a hypermarket or a public place, a multi-screen display of a teaching environment, a multi-screen display of a stock exchange, and a concert. Or the multi-screen display of the presentation, etc., this embodiment does not limit the operation of the AV transmission system 1.

FIG. 2 is a schematic functional block diagram of a video and audio transmission system according to another embodiment of the present invention. Please refer to Figure 2. The video-audio transmission system 2 of the present embodiment is similar to the video-audio transmission system 1 of the foregoing embodiment, and the same components that are included in the following will be denoted by the same reference numerals. For convenience of description, the present embodiment uses the digital televisions 10a, 10b. 10c, 10d, 10e, 10f, 10g, 10h output the same picture as a composite image, wherein the video transmission system 2 can also transmit the multimedia signal to the television signal through the modulation unit 124, and the transmission unit 126a can transmit the television signal to the digital signal. Televisions 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h.

However, there is still a difference between the audio-video transmission systems 2 and 1. The transmission unit 126a of the embodiment further includes a wired transmission interface 1262. Therefore, the present invention can perform wireless and wired dual-mode communication, and the television signal can pass through. The wired transmission interface 1262 and a transmission line 14 are transmitted to the digital televisions 10e, 10f, 10g, 10h, wherein The wired transmission interface 1262 is coupled to the modulation unit 124. The transmission line 14 is, for example, a coaxial cable, and is coupled between the wired transmission interface 1262 and the digital televisions 10e, 10f, 10g, and 10h. This embodiment does not limit the aspect of the transmission unit 126a.

In detail, the multimedia signal includes a data stream and a coded video stream, and the data stream and the encoded video stream are transmitted to the processing unit 122 and the modulation unit 124 via the connection interface 120, wherein the multimedia signal is, for example, a food program, a sports program, or music. For the convenience of description, the multimedia signal of the embodiment is, for example, a stream signal of a person interview program.

The modulating unit 124 modulates the multimedia signal into corresponding eight television signals according to the number of the digital televisions 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, wherein each television signal indicates an audio-visual program interviewed by the person. And four digital televisions 10a, 10b, 10c, 10d and the audio-visual transmission device 12a are wirelessly communicated, and the other four digital televisions 10e, 10f, 10g, 10h and the audio-visual transmission device 12a are wired, and the television signals are transparent. The radio frequency component 1260 and the wired transmission interface 1262 are transmitted to the digital televisions 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, whereby the digital televisions 10a, 10b, 10c, 10d, 10e, 10f, 10g At 10h, the interviews of people will be broadcast simultaneously. The audio-visual transmission system 2, which is not limited in this embodiment, operates and views. For example, four digital TVs 10a, 10b, 10c, and 10d can be set in the lecture hall, and four other digital televisions 10e, 10f, 10g, and 10h can be separately set in the four classrooms adjacent to the lecture hall. The device 12a is disposed, for example, in the lecture hall. Therefore, the video transmission device 12a can wirelessly transmit the television signal to the digital televisions 10a, 10b, 10c, and 10d in close proximity, and the audio and video transmission device 12a can remotely transmit the television signal to the digital television 10e. 10f, 10g, 10h, by means of the lectures in the four classrooms in the lecture hall and the adjacent lecture hall, the audio-visual transmission device 12a and the digital televisions 10a, 10b, 10c, 10d, 10e can be viewed. Between 10f, 10g, and 10h, there is no need to set a complex communication address, so that the video transmission device 12a and the digital televisions 10a, 10b, 10c, 10d, 10e, 10f, 10g, and 10h can be easily installed. Play multimedia video.

In addition to the above differences, those skilled in the art having reference to the above embodiments and the above differences should be easily inferred, and therefore will not be described herein.

FIG. 3 is a schematic functional block diagram of an audio and video transmission system according to another embodiment of the present invention. Please refer to Figure 3. The video-audio transmission system 3 of the present embodiment is similar to the video-audio transmission system 2 of the foregoing embodiment, and the same components that are included in the following are denoted by the same reference numerals. For convenience of description, the present embodiment uses the digital televisions 10a, 10b. 10c, 10d output a picture of a different audio and video program as a composite image, wherein the video transmission system 3 can also transmit the multimedia signal to the television signal through the modulation unit 124, and the transmission unit 126a can transmit the television signal to the digital television 10a, 10b. , 10c, 10d.

However, there is still a difference between the video transmission systems 3 and 2, in that the digital televisions 10a, 10b, 10c, 10d of the present invention can simultaneously play different audio and video programs. Specifically, the multimedia device 9 can provide a plurality of multimedia signals, such as stream signals of news programs, vehicle advertisements, sports programs, and landscape programs, respectively, wherein the modulation unit 124 is based on the digital televisions 10a, 10b, and 10c. The number of 10d is used to modulate the multimedia signals into corresponding plurality of television signals. For example, the streaming signal of the news program sports program corresponds to the fifteenth channel of the digital television 10a, and the serial signal of the vehicle advertisement corresponds to the digital television 10b. The seventeenth channel, the streaming signal of the sports program corresponds to the eighteenth channel of the digital television 10c, and the streaming signal of the landscape program corresponds to the twenty-fifth channel of the digital television 10d.

Therefore, the television signals are transmitted to the digital televisions 10a, 10b, 10c, and 10d through the transmission unit 126a of the radio frequency component 1260, for example, and the digital televisions 10a, 10b, 10c, and 10d are transmitted through the antennas 100a, 100b, and 100c. 100d receives the corresponding television signal, wherein each digital television 10a, 10b, 10c, 10d is output via a decoding unit (not shown) to cause the digital television 10a to output a news program, and the digital television 10b outputs a vehicle advertisement, and the digital television 10c outputs the motion. Programs and digital TV 10d output landscape programs. In addition, the present invention can also switch between performing wireless or wired dual mode communication, so the television signal can be transmitted through the radio frequency component 1260 or the wired transmission interface. 1262 for transmission to these digital televisions 10a, 10b, 10c, 10d. The audio-visual transmission system 3 of the embodiment is not limited in operation and aspect.

In addition to the above differences, those skilled in the art having reference to the above embodiments and the above differences should be easily inferred, and therefore will not be described herein.

In summary, the present invention is an audio-visual transmission system including a plurality of digital televisions and an audio-visual transmission device, and the audio-visual transmission device is connected to the multimedia device through the connection interface, and the multimedia signal is modulated into a plurality of television signals through the modulation unit. And transmitting to a digital television to enable a reserved channel of the digital television to output audio and video programs, thereby forming a multi-screen advertisement such as a video wall, a hypermarket or a public place, a multi-screen display of a teaching environment, and a multi-screen of a stock exchange. Display, concert or presentation of multiple screens, etc. In this way, the audio-visual transmission system of the present invention improves the convenience of operation.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention.

1‧‧‧Video transmission system

9‧‧‧Multimedia device

10a, 10b, 10c, 10d‧‧‧ digital TV

100a, 100b, 100c, 100d‧‧‧ antenna

102a, 102b, 102c, 102d‧‧‧ demodulation unit

104a, 104b, 104c, 104d‧‧‧ decoding unit

12‧‧‧Video transmission device

120‧‧‧Connection interface

122‧‧‧Processing unit

124‧‧‧Modulation unit

126‧‧‧Transmission unit

1260‧‧‧Wireless RF components

Claims (8)

An audio-visual transmission device is adapted to communicate with a plurality of digital televisions, each of the digital televisions has a receiving component, and each of the digital televisions includes a receiving channel, the audio-visual transmission device includes: a connection interface for connecting one The multimedia device is configured to provide a multimedia signal; a processing unit coupled to the connection interface for processing or computing the multimedia signal; a modulation unit coupled to the processing unit and configured to use the multimedia signal And corresponding to the plurality of television signals, and a transmission unit coupled to the modulation unit for transmitting the television signals; wherein the modulation unit uses the number of the digital televisions to The signal is modulated into a plurality of television signals corresponding to the number of digital televisions, each of the television signals being a partial picture of a program audio and video, and each of the television signals corresponds to the receiving channel of one of the digital televisions, and each The receiving channel is a channel different from each other in each of the digital televisions, so that each of the digital televisions transmits the When receiving element receives one of the plurality of television signals corresponding to where, the plurality of digital television combined to form a composite image signal for display. The video transmission device of claim 1, wherein the modulation unit loads each of the television signals into a transmission frequency band, so that the transmission unit transmits the television signals to the digital televisions through the transmission frequency bands. The transmission bands correspond to the different receiving channels that are different from each other. The video transmission device of claim 1, wherein the transmission unit is a radio frequency component for wirelessly transmitting the television signals. The video transmission device of claim 3, wherein the transmission unit further comprises a wired transmission interface coupled to the modulation unit for connecting to a transmission line, the transmission line being coupled to the wired transmission interface and the digits Between the televisions, and transmit the television signals. The video transmission device according to claim 1, wherein the television signals are in accordance with Digital Video Broadcasting (DVB), Integrated Services Digital Broadcasting (ISDB), and an advanced digital television. Advanced Television Systems Committee (ATSC), Terrestrial Digital Multimedia TV/Handle Broadcasting (DTMB, DMB-TH), Quadrature Amplitude Modulation (QAM) and/or A signal specification for China Mobile Multimedia Broadcasting (CMMB). The video transmission device of claim 1, wherein the multimedia signal comprises a data stream and a coded video stream, and the data stream and the encoded video stream are transmitted to the processing unit and the modulation via the connection interface. unit. The video transmission device of claim 6, wherein each of the digital televisions comprises a demodulation unit and a decoding unit, and each of the demodulation units receives one of the corresponding television signals and corresponds to One of the television signals is demodulated into the data stream and the encoded video stream, wherein the encoded video stream is decoded and operated by the decoding unit, so that the digital televisions output a video program. An audio-visual transmission system includes: a plurality of digital televisions, each of the digital televisions has a receiving component, and each of the digital televisions includes a receiving channel; and an audio-visual transmission device includes: a connection interface for connecting one The multimedia device is configured to provide a multimedia signal; a processing unit coupled to the connection interface for processing or computing the multimedia signal; a modulation unit coupled to the processing unit and configured to use the multimedia signal a plurality of televisions for modulating a plurality of television signals; and a transmission unit coupled to the modulation unit for transmitting the television signals; The modulating unit modulates the multimedia signal into a plurality of television signals corresponding to the number of digital televisions according to the number of the digital televisions, each of the television signals being a partial picture of a program video and audio, and each of the television signals The television signal corresponds to the receiving channel of one of the digital televisions, and each of the receiving channels is a mutually different channel in each of the digital televisions, so that each of the digital televisions receives the corresponding televisions through the receiving component. In one of the signals, the digital television combinations form a composite image as the multimedia signal.