CN104427375B - video and audio transmission device and system thereof - Google Patents

Abstract

An audio and video transmission device suitable for communicating with multiple digital televisions. The audio and video transmission device includes a connection interface, a processing unit, a modulation unit and a transmission unit. The connection interface is used to connect a multimedia device that outputs a multimedia signal. The processing unit is coupled to the connection interface and used for processing or computing multimedia signals. The modulation unit is coupled to the processing unit and used to correspond the multimedia signals to the digital televisions to modulate them into multiple television signals. The transmission unit is coupled to the modulation unit for transmitting the television signals. When each digital TV receives one of the corresponding TV signals, a channel of each digital TV will broadcast the corresponding one of the TV signals, and a composite image is displayed on the digital TVs.

Description

Audio-visual transmission device and system thereof

technical field

The present invention relates to an audio-visual transmission device and its system, in particular to an audio-visual transmission device connected to a multimedia device to transmit signals to a digital TV and its system.

Background technique

With the advancement of multimedia audio-visual technology, people's lives are closely related to multimedia audio-visual technology, where multimedia audio-visual technology is used in teaching environments, monitoring environments, concerts, presentations, advertisements or video walls, etc., therefore, the application of multimedia audio-visual technology At least one multimedia device and multiple audio-visual output devices are usually configured in the environment, wherein the multimedia device is, for example, a laptop, and the audio-visual output devices are, 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 make the staff spend a considerable amount of time arranging multimedia devices and audio-visual output devices. For example, the staff places multiple audio-visual output devices and multimedia devices on After the location is pre-marked, the staff need to set the communication addresses of multiple audio-visual output devices and multiple multimedia devices. The communication addresses are, for example, dynamic network addresses, so the staff need to spend a considerable amount of time to set the communication addresses.

Furthermore, after the staff completes the communication address setting of the audio-visual output device and the multimedia device, if the staff wants to change the connection status of the audio-visual output device and the multimedia device, such as changing the communication address of the audio-visual output device, the staff needs to reset Therefore, the audio-visual output device and the multimedia device will take time to reconnect.

Contents of the invention

The present invention provides an audio-visual transmission device and its system, wherein the audio-visual transmission device is connected to a multimedia device to receive a multimedia signal, and the audio-visual transmission device modulates the multimedia signal into a TV signal through a modulation unit and transmits it to a digital TV for A reserved channel of the digital TV is used to output audio-visual programs, thereby improving the efficiency and convenience of the audio-visual transmission system.

The invention proposes an audio-visual transmission device, which is suitable for communicating with multiple digital TVs. Each digital TV has a receiving component, and the audio-video transmission device includes a connection interface, a processing unit, a modulation unit and a transmission unit. The connection interface is used for connecting a multimedia device, and the multimedia device is used for providing a multimedia signal. The processing unit is coupled to the connection interface for processing or calculating the multimedia signal. The modulation unit is coupled to the processing unit, and is used to match the multimedia signal to some digital TVs and modulate it into a plurality of TV signals. The transmission unit is coupled to the modulation unit for transmitting the television signals. Wherein, the modulation unit modulates the multimedia signal into a plurality of television signals corresponding to the quantity of the digital televisions according to the quantity 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 TV receives one of the corresponding TV signals through the receiving component, the digital TVs are combined to form a composite image as a multimedia signal.

Wherein, the modulation unit loads each of the television signals into a transmission frequency band, so that the transmission unit transmits each of the television signals to the digital televisions through the transmission frequency bands.

Wherein, the transmission unit is a radio frequency component for wirelessly transmitting the television signals.

Wherein, the transmission unit further includes a wired transmission interface coupled to the modulation unit for connecting a transmission line, the transmission line is coupled between the wired transmission interface and the digital televisions, and transmits the television signals.

Among them, these TV signals comply with a digital video broadcasting, an integrated digital service broadcasting, an advanced digital television system committee, a digital digital television terrestrial multimedia broadcasting, a quadrature amplitude modulation and/or a China Mobile multimedia broadcasting digital television Signal specification.

Wherein, the multimedia signal includes a data stream and a coded video stream, and the data stream and the coded video stream are transmitted to the processing unit and the modulation unit through the connection interface.

Wherein, each of the digital televisions includes a demodulation unit and a decoding unit, and each of the demodulation units receives one of the corresponding television signals, and demodulates one of the corresponding television signals into the A data stream and the coded audio-video stream, where the coded video-audio stream is decoded by the decoding unit so that the digital TVs output an audio-video program.

The present invention proposes an audio-visual transmission system, which includes multiple digital televisions and an audio-visual transmission device. Each digital television has a receiving component. The audio-video transmission device includes a connection interface, a processing unit, a modulation unit and a transmission unit. The connection interface is used for connecting a multimedia device, and the multimedia device is used for providing a multimedia signal. The processing unit is coupled to the connection interface for processing or calculating the multimedia signal. The modulation unit is coupled to the processing unit, and is used to match the multimedia signal to some digital TVs and modulate it into a plurality of TV signals. The transmission unit is coupled to the modulation unit for transmitting the television signals. Wherein, the modulation unit modulates the multimedia signal into a plurality of television signals corresponding to the quantity of the digital televisions according to the quantity 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 TV receives one of the corresponding TV signals through the receiving component, the digital TVs are combined to form a composite image as a multimedia signal.

The specific means of the present invention is to utilize the audio-visual transmission system, including multiple digital televisions and an audio-visual transmission device connected to a multimedia device, and the audio-visual transmission device modulates multimedia signals into multiple television signals through a modulation unit, and transmits them to the digital TV In order to make a reserved channel of the digital TV output audio-visual programs, thereby improving the efficiency and convenience of the audio-visual transmission system.

The above overview and the following embodiments are all for further illustrating the technical means and effects of the present invention, but the described embodiments and drawings are only for reference and description, and are not intended to limit the present invention.

Description of drawings

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

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

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

Explanation of reference signs

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: Radio Frequency Components

1262: Wired transmission interface

14: Transmission line

detailed description

FIG. 1 is a functional block diagram of an audio-video transmission system according to an embodiment of the present invention. See Figure 1. An audio-video transmission system 1 includes a plurality of digital televisions 10 a , 10 b , 10 c , 10 d and an audio-video transmission device 12 . In practice, the audio-visual transmission system 1 is, for example, applied to multi-screen advertisements in video walls, hypermarkets or public places, multi-screen displays in teaching environments, multi-screen displays in stock exchanges, multi-screen displays in concerts or presentations, etc. This embodiment does not limit the operation of the video and audio transmission system 1 .

In detail, each digital television 10a, 10b, 10c, 10d has a receiving component. For the convenience of description, the receiving component in this embodiment is an antenna 100a, 100b, 100c, 100d. In other embodiments, the receiving component is, for example, As for the cable TV interface (TV Cable Interface), this embodiment does not limit the aspect of the receiving component.

In practice, the digital television 10a, 10b, 10c, 10d includes a demodulation unit 102a, 102b, 102c, 102d and a decoding unit 104a, 104b, 104c, 104d, and the demodulation unit 102a, 102b, 102c, 102d receives to the local digital TV signal, and the local digital TV signal will be decoded by the decoding unit 104a, 104b, 104c, 104d, so that the digital TV 10a, 10b, 10c, 10d can output the local TV program, such as Taiwan wireless TV industry It is to use the DVB-T standard as the production and broadcasting standard of digital TV 10a, 10b, 10c, 10d, so that some channels of digital TV 10a, 10b, 10c, 10d can output local TV programs, such as digital TV 10a, 10b, 10c and 10d can output the programs produced and broadcasted by Taiwan Television Company, China Television Company, China Television Company or folk National Television Company. Certainly, some channels of the digital TVs 10a, 10b, 10c, and 10d are reserved channels, and the reserved channels have no program content to output.

For the convenience of description, in this embodiment, the reserved channel is used as the channel of the audio-visual program transmitted by the audio-visual transmission device 12, so that the digital TV 10a, 10b, 10c, and 10d output the audio-visual program transmitted by the audio-visual transmission device 12. In other implementations In the example, the audio-visual transmission system 1 can also use the TV signal technology of the platform, so that the digital TVs 10a, 10b, 10c, and 10d output the audio-visual programs transmitted by the audio-visual transmission device 12. This embodiment does not limit the operation of the audio-visual transmission system 1. appearance. In addition, the present embodiment is illustrated with four digital televisions 10a, 10b, 10c, and 10d. In other embodiments, the number of digital televisions 10a, 10b, 10c, and 10d can be two, three, five, or eight or more, this embodiment does not limit the number of digital televisions 10a, 10b, 10c, 10d.

The video and audio 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, so the audio-video transmission device 12 is connected to a multimedia device 9 through the connection interface 120, so the multimedia device 9 can wirelessly transmit multimedia signals to digital TVs 10a, 10b, 10c, and 10d through the video and audio transmission device 12. In addition, the audio-video transmission device 12 can be a small and light-weight USB stick or other portable electronic devices, and this embodiment does not limit the form of the audio-video transmission device 12 .

Specifically, the connection interface 120 is used to connect a multimedia device 9, and the multimedia device 9 is, for example, a desktop computer, a tablet computer, a laptop, a mobile communication device or a personal digital assistant (Personal Digital Assistant, PDA), etc., and is used to provide a For the multimedia signal, the present embodiment does not limit the form of the multimedia device 9 . In practice, the connection interface 120 complies with the interface specifications of a Transport Stream (TS), a Universal Serial Bus and/or an Ethernet, and the embodiment does not limit the form of the connection interface 120 .

For example, the connection interface 120 is a universal serial bus, so the audio-video transmission device 12 is connected to the USB port of the notebook through the universal serial bus, so the user can operate the notebook to play an audio-visual program, The audio and video of this audio-visual program will be converted into MPEG2 or H.264 streaming multimedia signals, and sent to the processing unit 122 through the connection interface 120 for calculation and processing. This embodiment does not limit the operation of the connection interface 120 and the multimedia device 9 situation.

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

The modulating unit 124 is coupled to the processing unit 122 and used for modulating the multimedia signals corresponding to the digital TVs 10a, 10b, 10c, 10d into a plurality of TV 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 audio-visual streaming 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 modulation unit 124 modulates the multimedia signal into a plurality of TV signals corresponding to the numbers of the digital TVs 10a, 10b, 10c, and 10d according to the numbers of the digital TVs 10a, 10b, 10c, and 10d, and each TV signal corresponds to the A receiving channel of one of the digital TVs 10a, 10b, 10c, 10d, so that when each digital TV 10a, 10b, 10c, 10d receives one of the corresponding TV signals through the antenna 100a, 100b, 100c, 100d , these digital televisions 10a, 10b, 10c, 10d are combined to form a composite image as a multimedia signal. In addition, the modulation unit 124 loads each TV signal into a transmission frequency band, so that the transmission unit 126 transmits each TV signal to the digital TVs 10a, 10b, 10c, and 10d through the transmission frequency band. In detail, the modulation unit 124 adopts a standard digital TV modulation method to support various mainstream digital TV specifications in the world, so the digital TVs 10a, 10b, 10c, and 10d also have demodulation units 102a, 102b, 102c, and 102d as A standard receiving modulator, and the modulation unit 124 can transmit TV signals to these digital TVs 10a, 10b, 10c, and 10d through spread spectrum communication technology, thereby reducing signal attenuation and multi-path interference in the communication process, Therefore, the transmission efficiency and communication quality are improved. The modulation unit 124 can modulate and convert the multimedia signal into a plurality of TV signals, wherein these TV signals conform to a Digital Video Broadcasting (DVB), an Integrated Services Digital Broadcasting (ISDB), an advanced Digital TV System Committee (Advanced Television Systems Committee, ATSC), a digital TV terrestrial multimedia broadcasting (Terrestrial Digital Multimedia TV/Handle Broadcasting, DTMB, DMB-TH), a quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM) and / Or a China Mobile Multimedia Broadcasting (CMMB) signal specification.

It is worth mentioning that the multimedia signal is modulated into multiple TV signals by the modulating unit 124, one of which will be sent to the twenty-first channel corresponding to the digital TV 10a, and the other TV signal will be sent to the corresponding digital TV The twenty-fifth channel of 10b, another TV signal will be transmitted to the thirty-fifth channel corresponding to the digital TV 10c, and the remaining one TV signal will be transmitted to the fifth channel corresponding to the digital TV 10d, wherein the digital TV The twenty-first channel, the twenty-fifth channel, the thirty-fifth channel and the fifth channel of 10a, 10b, 10c, and 10d are all reserved channels. In other embodiments, these TV signals can be Send to the same channel of these digital TVs 10a, 10b, 10c, 10d. For example, these TV signals can be sent to the twenty-first channel of these digital TVs 10a, 10b, 10c, 10d. This embodiment does not limit the multimedia signal A plurality of television signals are modulated by the modulating unit 124, and these television signals are transmitted to the operation state of the reserved channels of the digital televisions 10a, 10b, 10c, and 10d.

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

It is worth noting that the modulation unit 124 may have a frequency band table (not shown), and the frequency band table (not shown) is used to indicate the relationship between multiple TV signals corresponding to multiple digital TV sets 10a, 10b, 10c, 10d, such as modulation The unit 124 can use the 420MHz frequency band to transmit the TV signal corresponding to the digital TV 10a to the digital TV 10a through the transmission unit 126, and the modulation unit 124 can use the 450MHz frequency band to transmit the TV signal corresponding to the digital TV 10b through the transmission unit 126 For transmission to the digital TV 10b, similarly, the modulation unit 124 can use 460MHz and 480MHz frequency bands to transmit the TV signals corresponding to the digital TVs 10c and 10d to the digital TVs 10c and 10d through the transmission unit 126 respectively.

In other embodiments, the frequency band table (not shown) can also be used to indicate that each digital TV 10a, 10b, 10c, 10d corresponds to a plurality of TV signals, for example, digital TVs 10a, 10b, 10c, 10d have fifteen Channels that are publicly broadcast in the local country of the station, and the frequency band table (not shown) can avoid the channels that are publicly broadcast in the local country, and multiple TV signals are modulated and transmitted in the 420MHz, 450MHz, 460MHz and 480MHz frequency bands, of which 420MHz , 450MHz, 460MHz and 480MHz frequency bands correspond to the twenty-first channel, twenty-fifth channel, thirty-fifth channel and fifth channel of each digital TV 10a, 10b, 10c, 10d respectively, so The user can switch the digital TVs 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 on the digital TV 10a, 10b, 10c, 10d, of course, when the user can respectively switch the digital TV 10a, 10b, 10c, 10d to the twenty-first channel, the digital TV 10a, 10b, 10c, 10d will display the same image picture. This embodiment does not limit the configuration and operation of the modulation unit 124 and the frequency band table. The transmission unit 126 is coupled to the modulation unit 124 for transmitting the television signals. In practice, the transmission unit 126 is, for example, a wireless radio frequency component 1260 and/or a wired transmission interface 1262. For the convenience of description, the transmission unit 126 in this embodiment is described as a wireless radio frequency component 1260. This embodiment does not limit the configuration of the transmission unit 126. appearance. For example, the radio frequency component 1260 is the radio frequency antenna 100a, 100b, 100c, 100d, so these TV signals are transmitted to the digital TVs 10a, 10b, 10c, 10d through the radio frequency component 1260 .

When each digital TV 10a, 10b, 10c, 10d receives one of the corresponding TV signals through the antenna 100a, 100b, 100c, 100d, a receiving channel of each digital TV 10a, 10b, 10c, 10d will broadcast Corresponding to one of the TV signals, a composite image is displayed on the digital TVs 10a, 10b, 10c, 10d.

In practice, the multimedia signal provided by the multimedia device 9 will be encoded into MPEG2 or H.264 format through the encoding unit to convert it into a streaming multimedia signal, and the streaming multimedia signal will be transmitted through the connection interface 120. It is sent to the processing unit 122 and the modulation unit 124, wherein the modulation unit 124 modulates the coded and converted multimedia signal into a TV signal such as ATSC, DVB-T, ISDB-T or DMB-TH, and converts it through the transmission unit 126 into The radio frequency signal on the predetermined frequency band is then transmitted by the radio frequency antenna 100a, 100b, 100c, 100d, and after the digital TV 10a, 10b, 10c, 10d receives the TV signal from the audio-visual transmission device 12, it can restore the video with sound and video TV signal to output video and audio 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 gourmet program, a sports program, a music program, a news program, or an exclusive interview program. , and the multimedia device 9 will transmit a multimedia signal such as pizza to the audio-visual transmission device 12, and the multimedia signal is modulated into four TV signals by the modulating unit 124, wherein each TV signal is for example indicating to display a quarter of a pizza The intermediate frequency (IF) signal of the image, and these intermediate frequency signals will be transmitted to each digital TV 10a, 10b, 10c, 10d, when each digital TV 10a, 10b, 10c, 10d passes through the antenna 100a, 100b, 100c, 100d When the corresponding TV signal is received, a receiving channel of each digital TV 10a, 10b, 10c, 10d will play the corresponding TV signal, so a synthesized pizza image will be displayed on these digital TVs 10a, 10b, 10c, 10d on, as shown in Figure 1. This embodiment does not limit the operation and form of the video and audio transmission system 1 .

Based on the above, there is no need to set complicated communication addresses between the video and audio transmission device 12 and the digital TVs 10a, 10b, 10c, and 10d, so the communication between the video and audio transmission device 12 and the digital TVs 10a, 10b, 10c, and 10d can be easily completed. Set up and play multimedia audio and video. In other embodiments, the audio and video transmission system 1 can also be used in multi-screen advertisements in video walls, hypermarkets or public places, multi-screen displays in teaching environments, multi-screen displays in stock exchanges, and concerts. Or the multi-screen display of presentations, etc., this embodiment does not limit the operation of the audio-visual transmission system 1 .

FIG. 2 is a functional block diagram of an audio-video transmission system according to another embodiment of the present invention. See Figure 2. The audio-visual transmission system 2 of the present embodiment is similar to the audio-visual transmission system 1 of the foregoing embodiment, and the same components included in the two will be represented by the same reference numerals below. , 10c, 10d, 10e, 10f, 10g, and 10h output the same picture as a composite image, wherein the audio-visual transmission system 2 can also use the modulation unit 124 to modulate the multimedia signal into a TV signal, and the transmission unit 126a can transmit the TV signal to Digital TV 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h.

However, there is still a difference between the audio-visual transmission system 2 and 1, which is: the transmission unit 126a of this embodiment further includes a wired transmission interface 1262, so the present invention can perform wireless and wired dual-mode communication, and the TV signal can be transparent Transmission to the digital TV 10e, 10f, 10g, 10h through the wired transmission interface 1262 and a transmission line 14, wherein the wired transmission interface 1262 is coupled to the modulation unit 124, and the transmission line 14 is, for example, a coaxial cable, coupled between the wired transmission interface 1262 and the Among the digital televisions 10e, 10f, 10g, and 10h, this embodiment does not limit the form of the transmission unit 126a.

Specifically, the multimedia signal includes a data stream and a coded video stream, and the data stream and the coded video stream are transmitted to the processing unit 122 and the modulation unit 124 through the connection interface 120, wherein the multimedia signal is, for example, a gourmet program, a sports program, a music program, etc. For the convenience of description, the multimedia signal in this embodiment is, for example, the streaming signal of a character interview program for the stream signal of a program, a news program or a character interview program.

The modulation unit 124 modulates the multimedia signal into eight corresponding TV signals according to the numbers of these digital TVs 10a, 10b, 10c, 10d, 10e, 10f, 10g, and 10h, wherein each TV signal is an audio-visual program indicating an exclusive interview with a person, And the four digital TVs 10a, 10b, 10c, 10d and the audio-visual transmission device 12a adopt wireless communication, and the other four digital TVs 10e, 10f, 10g, 10h and the audio-visual transmission device 12a adopt wired communication, and these TV signals can be transmitted through Through the wireless radio frequency component 1260 and the wired transmission interface 1262, to transmit to these digital TVs 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, so these digital TVs 10a, 10b, 10c, 10d, 10e, 10f, 10g 10h and 10h will simultaneously broadcast character interview programs. This embodiment does not limit the operation and aspect of the video and audio transmission system 2 . For example, four digital TV sets 10a, 10b, 10c, and 10d can be set in the lecture hall, and another four digital TV sets 10e, 10f, 10g, and 10h can be set respectively in four classrooms adjacent to the lecture hall. The device 12a is installed in a lecture hall, for example. Therefore, the audio-visual transmission device 12a can wirelessly transmit TV signals to the digital TVs 10a, 10b, 10c, and 10d in a short distance, and the video-audio transmission device 12a can transmit TV signals to the digital TVs 10e, 10e, and 10d via long-distance cable. 10f, 10g, 10h, so the personnel in the lecture hall and the four classrooms adjacent to the lecture hall can watch the speech program of the personal interview, wherein the audio-visual transmission device 12a is connected with these digital TVs 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h do not need to go through complex communication address settings, so the audio-visual transmission device 12a and these digital TVs 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h can be easily set up and played Multimedia audio and video.

In addition to the above differences, those skilled in the art should be able to easily deduce them after referring to the above embodiments and the above differences, so details are not repeated here.

FIG. 3 is a functional block diagram of an audio-video transmission system according to another embodiment of the present invention. See Figure 3. The audio-visual transmission system 3 of the present embodiment is similar to the audio-visual transmission system 2 of the foregoing embodiment, and the same components included in the two will be represented by the same reference numerals below. , 10c, and 10d output pictures of different audio-visual programs as composite images, wherein the audio-visual transmission system 3 can also pass through the modulation unit 124, so that the multimedia signal is modulated into a TV signal, and the transmission unit 126a can transmit the TV signal to the digital TV 10a, 10b, 10c, 10d.

However, there is still a difference between the audio-visual transmission systems 3 and 2, which lies in that the digital televisions 10a, 10b, 10c, and 10d of the present invention can simultaneously play different audio-visual programs. Specifically, the multimedia device 9 can provide a plurality of multimedia signals, such as streaming signals of news programs, vehicle advertisements, sports programs and scenery programs, wherein the modulating unit 124 is based on the digital televisions 10a, 10b, 10c , the number of 10d, so as to modulate these multimedia signals into corresponding multiple TV signals, for example, the streaming signals of news programs and sports programs correspond to the fifteenth channel of digital TV 10a, and the streaming signals of vehicle advertisements correspond to digital TV 10b The seventeenth channel of the sports program corresponds to the eighteenth channel of the digital TV 10c, and the scenery program corresponds to the twenty-fifth channel of the digital TV 10d.

Therefore, these TV signals are wirelessly transmitted to these digital TVs 10a, 10b, 10c, 10d through the transmission unit 126a of the radio frequency component 1260, and each digital TV 10a, 10b, 10c, 10d passes through the antennas 100a, 100b, 100c, 100d receive corresponding TV signals, wherein each digital TV 10a, 10b, 10c, 10d passes through a decoding unit (not shown), so that digital TV 10a outputs news programs, and digital TV 10b outputs vehicle advertisements, digital TV 10c outputs sports programs and digital television 10d outputs scenery programs. In addition, the present invention can switch between wireless and wired dual-mode communication, so TV signals can be transmitted to these digital TVs 10a, 10b, 10c, and 10d through the wireless radio frequency component 1260 or the wired transmission interface 1262 . This embodiment does not limit the operation and aspect of the video and audio transmission system 3 .

In addition to the above differences, those skilled in the art should be able to easily deduce them after referring to the above embodiments and the above differences, so details are not repeated here.

In summary, the present invention is an audio-visual transmission system, which includes multiple digital televisions and an audio-visual transmission device, and the audio-visual transmission device is connected to a multimedia device through a connection interface, and modulates the multimedia signal into a plurality of TV signal, and transmit it to digital TV, so that a reserved channel of digital TV can output audio-visual programs, thus forming multi-screen advertisements such as video wall, hypermarket or public place, multi-screen display in teaching environment, stock exchange Multi-screen display, multi-screen display for concerts or presentations, etc. In this way, the video and audio transmission system of the present invention improves the convenience of operation.

The above descriptions are only examples of the present invention, and are not intended to limit the patent scope of the present invention.

Claims (8)

1. An audio-visual transmission device is suitable for communicating with multiple digital televisions, each of which has a receiving assembly, and is characterized in that each of the digital televisions includes a receiving channel reserved, and the audio-visual transmission device includes: a connection interface, used to connect a multimedia device, and the multimedia device is used to provide a multimedia signal; a processing unit, coupled to the connection interface, for processing or calculating the multimedia signal; a modulating unit, coupled to the processing unit, and used to correspond the multimedia signal to the digital televisions, so as to modulate into a plurality of television signals; and a transmission unit, coupled to the modulation unit, for transmitting the television signals; Wherein, the modulation unit modulates the multimedia signal into a plurality of television signals corresponding to the quantity of the digital televisions according to the quantity of the digital televisions, and each of the multiple television signals is a partial picture of a program video and audio, and each The plurality of television signals correspond to the receiving channel of one of the digital televisions, and each of the receiving channels is a different channel in each of the digital televisions, so that each of the digital televisions receives the corresponding receiving channel through the receiving component When one of the TV signals is used, the digital TVs are combined to form a synthetic image as the multimedia signal. 2. The video and audio transmission device according to claim 1, wherein the modulation unit loads each of the television signals into a transmission frequency band, so that the transmission unit transmits each of the television signals to the transmission frequency bands through the transmission frequency bands. For digital television, the transmission frequency bands correspond to the reception channels which are different from each other. 3 . The video and audio transmission device according to claim 1 , wherein the transmission unit is a radio frequency component for wirelessly transmitting the television signals. 4 . 4. The video and audio transmission device according to claim 3, wherein the transmission unit further comprises a wired transmission interface coupled to the modulation unit for connecting a transmission line, the transmission line is coupled between the wired transmission interface and the Between these digital TVs, and transmit these TV signals. 5. The video and audio transmission device according to claim 1, wherein the TV signals conform to a digital video broadcast, an integrated digital service broadcast, an advanced digital television system committee, a digital digital television terrestrial multimedia broadcast, a formal AC AM and/or a China Mobile Multimedia Broadcasting Digital TV signal specification. 6. The video and audio transmission device according to claim 1, wherein the multimedia signal includes a data stream and a coded video and video stream, and the data stream and the coded video and video stream are transmitted to the processing unit and the video through the connection interface the modulation unit. 7. The video and audio transmission device according to claim 6, wherein each of the digital TVs includes a demodulation unit and a decoding unit, and each of the demodulation units receives one of the corresponding TV signals, and demodulating one of the corresponding TV signals into the data stream and the coded video stream, wherein the coded video stream is decoded by the decoding unit so that the digital TVs output a video program. 8. A video and audio transmission system, characterized in that it comprises: A plurality of digital televisions, each of which has a receiving component, and each of which includes a reserved receiving channel; and An audio-visual transmission device, comprising: a connection interface, used to connect a multimedia device, and the multimedia device is used to provide a multimedia signal; a processing unit, coupled to the connection interface, for processing or calculating the multimedia signal; a modulating unit, coupled to the processing unit, and used to correspond the multimedia signal to the digital televisions, so as to modulate into a plurality of television signals; and a transmission unit, coupled to the modulation unit, for transmitting the television signals; Wherein, the modulation unit modulates the multimedia signal into a plurality of television signals corresponding to the quantity of the digital televisions according to the quantity of the digital televisions, and each of the multiple television signals is a partial picture of a program video and audio, and each The plurality of television signals correspond to the receiving channel of one of the digital televisions, and each of the receiving channels is a different channel in each of the digital televisions, so that each of the digital televisions receives the corresponding receiving channel through the receiving component When one of the TV signals is used, the digital TVs are combined to form a synthetic image as the multimedia signal.