CN102137304A

CN102137304A - Television signal transmission method, set top box and television

Info

Publication number: CN102137304A
Application number: CN 201010538283
Authority: CN
Inventors: 林耀升; 余大伟; 秦小庆
Original assignee: Huawei Device Co Ltd
Current assignee: Huawei Device Co Ltd
Priority date: 2010-10-29
Filing date: 2010-10-29
Publication date: 2011-07-27
Anticipated expiration: 2030-10-29
Also published as: CN102137304B

Abstract

The embodiment of the invention discloses a television signal transmission cost, a set top box and a television, which can reduce cost for television program watching on a plurality of televisions. The method provided by the embodiment of the invention comprises the following steps of: receiving a radio frequency (RF) input signal; selecting a corresponding frequency point in the RF input signal according to program information selected by a user; demodulating the frequency point to obtain a scrambled transmission stream; descrambling the scrambled transmission stream to obtain a transmission stream; modulating the transmission stream to obtain an RF output signal; and sending the RF output signal to the plurality of televisions through a television distributor, so that the users can watch corresponding television programs on the televisions. The embodiment of the invention also provides a television signal transmission system and related equipment. The embodiment of the invention can reduce the cost for the television program watching on the plurality of televisions.

Description

Television signal transmission method, set top box and television

Technical Field

The present invention relates to the field of communications, and in particular, to a television signal transmission method, a set-top box, and a television.

Background

In order to facilitate the operation and authority management of tv program service, digital tv operators need to scramble tv programs, and since tv sets generally do not have descrambling function and scrambling techniques used by various operators are different, there is a need for a device, such as a digital set-top box, capable of receiving digital tv programs and having descrambling function.

Nowadays, a family may have multiple televisions at the same time to meet the requirement of watching television programs independently in multiple rooms.

However, programs output by all audio and video interfaces of one set top box are the same at present, the requirement that multiple television sets in one family independently watch television programs cannot be met by using one set top box, and the scheme that one television set is provided with one set top box is a relatively universal solution at present.

In the prior art, if a user wants to watch television programs independently on a plurality of televisions, a set-top box is required for each television, but the cost for the user and the operator is greatly increased.

Disclosure of Invention

The embodiment of the invention provides a television signal transmission method, a set top box and a television, which can reduce the cost of watching television programs by multiple televisions.

The television signal transmission method provided by the embodiment of the invention comprises the following steps: receiving a radio frequency carrier (RF) input signal; selecting a corresponding frequency point in the RF input signal according to the program information selected by the user; demodulating the frequency point to obtain a scrambled transmission stream; descrambling the scrambled transmission stream to obtain a transmission stream; modulating the transport stream to obtain an RF output signal; and transmitting the RF output signal to each television through a television distributor so that the television watches the corresponding television program.

The television signal transmission method provided by the embodiment of the invention comprises the following steps: receiving a radio frequency carrier RF output signal sent by a set top box through a television distributor, wherein the RF output signal is obtained by demodulating, descrambling and modulating a corresponding frequency point in an RF input signal by the set top box; selecting a corresponding frequency point in the RF output signal according to the program information selected by the user; and demodulating the frequency points selected from the RF output signals to obtain television signals.

The set-top box provided by the embodiment of the invention comprises: a signal input for receiving a radio frequency carrier, RF, input signal; the signal demodulator is used for selecting a corresponding frequency point in the RF input signal according to the program information selected by the user and demodulating the frequency point to obtain a scrambled transmission stream; a signal descrambler, configured to descramble the scrambled transport stream to obtain a transport stream; a signal modulator for modulating the transport stream to obtain an RF output signal; and the signal output end is used for transmitting the RF output signal to each television through a television distributor so that the television watches the corresponding television program.

The television provided by the embodiment of the invention comprises: the system comprises a signal receiving end and a signal processing end, wherein the signal receiving end is used for receiving a radio frequency carrier RF output signal sent by a set top box through a television distributor, and the RF output signal is obtained by demodulating, descrambling and modulating a corresponding frequency point in an RF input signal through the set top box; the signal selector is used for selecting corresponding frequency points in the RF output signals according to the program information in the program range selected by the user; and the signal processor is used for demodulating the frequency points selected from the RF output signals to obtain television signals.

According to the technical scheme, the embodiment of the invention has the following advantages:

in the embodiment of the invention, after the set-top box receives a Radio Frequency (RF) input signal, a corresponding Frequency point can be selected in the RF input signal according to program information selected by a user, and the Frequency point is demodulated, so that simultaneous demodulation and output of multiple channels of programs can be realized, the output signal contains a signal of the program information selected by the user, the signal can be distributed to multiple televisions through a television distributor, and the televisions can watch television programs, so that the multiple televisions can watch television programs independently by using one set-top box, and the cost of watching television programs by using multiple televisions is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic diagram of a television signal transmission method according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of another embodiment of a television signal transmission method according to the present invention;

FIG. 3 is a schematic diagram of a television signal transmission process according to the present invention;

FIG. 4 is a schematic view of a user interface arrangement of the present invention;

FIG. 5 is a schematic diagram of another embodiment of a television signal transmission method according to the present invention;

FIG. 6 is a schematic diagram of another embodiment of a television signal transmission method according to the present invention;

FIG. 7 is another schematic diagram of a television signal transmission process according to the present invention;

FIG. 8 is another schematic view of a user interface arrangement according to the present invention;

FIG. 9 is a schematic diagram of one embodiment of a set-top box of the present invention;

FIG. 10 is a schematic view of another embodiment of the set-top box of the present invention;

FIG. 11 is a schematic diagram of a television of the present invention;

FIG. 12 is a schematic diagram of another embodiment of a television set according to the present invention;

fig. 13 is a schematic diagram of a television signal transmission system according to an embodiment of the present invention.

Detailed Description

The television signal transmission method in this embodiment may specifically include:

(1) receiving a radio frequency carrier (RF) input signal;

in this embodiment, the set-top box may receive an RF input signal from a server of a digital television operator, where the RF input signal may include a plurality of frequency points, and each frequency point may carry a plurality of channels of digital programs.

The specific process of receiving the RF input signal is well known to those skilled in the art and is not limited herein.

(2) Selecting a corresponding frequency point in the RF input signal according to the program information selected by the user;

in this embodiment, the set top box may acquire program information selected by a user, and select a corresponding frequency point in the RF input signal according to the program information selected by the user.

(3) Demodulating the frequency point to obtain a scrambled transmission stream;

(4) descrambling the scrambled transmission stream to obtain a transmission stream;

(5) modulating the transport stream to obtain an RF output signal;

after the set-top box obtains the transport stream, the transport stream may be modulated to obtain an RF output signal, where the RF output signal includes content corresponding to the program information selected by the user.

(6) The RF output signal is transmitted to each television through a television distributor so that the television views the corresponding television program.

After the set-top box modulates the transmission stream to obtain an RF output signal, the RF output signal can be output to a television distributor through a cable television line, and then the television distributor outputs the RF output signal to each television connected to the television distributor, so that each television can watch a corresponding television program.

In this embodiment, after receiving a Radio Frequency (RF) input signal, the set-top box may select a corresponding Frequency point in the RF input signal according to program information selected by a user, and demodulate the Frequency point, which may implement simultaneous demodulation and output of multiple channels of programs, where the output signal includes a signal of the program information selected by the user, and the signal may be distributed to multiple televisions through a television distributor, so that the televisions can all watch television programs, and thus, using one set-top box may enable multiple televisions to watch television programs independently, thereby reducing the cost of watching television programs by multiple televisions.

The television signal transmission method in the embodiment of the present invention is described above from the perspective of a set-top box, and the television signal transmission method in the embodiment of the present invention is described below from the perspective of an auxiliary television, and the television signal transmission method in the embodiment of the present invention may specifically include:

(1) receiving a radio frequency carrier RF output signal transmitted by a set-top box through a television distributor;

in this embodiment, the RF output signal is obtained by the set-top box demodulating, descrambling, and modulating the corresponding frequency point in the RF input signal, and the specific process may be similar to the process of the set-top box processing the RF input signal described in the foregoing embodiment.

(2) Selecting a corresponding frequency point in the RF output signal according to the program information selected by the user;

the auxiliary television can select a corresponding frequency point in the received RF output signal according to the program information selected by the user.

(3) The selected frequency points in the RF output signal are demodulated to obtain a television signal.

After the corresponding frequency point is selected, the auxiliary television can demodulate the frequency point selected in the RF output signal to obtain a television signal, so that a television program is played.

The "program information selected by the user" in the above embodiment may be "program information in a program range selected by the user and preset on the set-top box", or "program information of a plurality of target programs specified by the user through a control signal, that is, the control signal corresponds to the program information of the target program selected by the user", which is described below:

firstly, providing the television programs in the program range to the user according to the program range selected by the user:

referring to fig. 1, an embodiment of a television signal transmission method according to the present invention includes:

101. receiving an RF input signal;

102. Selecting a corresponding frequency point in the RF input signal according to preset program information in a program range selected by a user;

in this embodiment, a user may set, in advance, a program range that can be received by each secondary television in the set-top box, where the size of the program range may be determined according to the processing capability of the set-top box, and the specific details are not limited herein.

It should be noted that, in this embodiment, the television directly connected to the set-top box through the high-definition cable is the main television, and the television connected to the set-top box through the television distributor is the auxiliary television.

After the set-top box receives the RF input signal, a corresponding frequency point may be selected in the RF input signal according to each program information in the program range, that is, the frequency point where the program information is located is searched.

103. Demodulating the frequency point to obtain a scrambled transmission stream;

104. descrambling the scrambled transmission stream to obtain a transmission stream;

the processing procedure of the signals in steps 103 to 104 in this embodiment is common knowledge of those skilled in the art, and is not limited herein.

105. Modulating the transport stream to obtain an RF output signal;

after the set-top box obtains the transport stream, the transport stream may be re-modulated, and the specific modulation manner may be digital modulation, or digital-to-analog conversion modulation, or other types of modulation manners, which is not limited herein.

The modulated RF output signal includes output frequency point information, which is a default frequency point or a frequency point set by a user.

106. The RF output signal is transmitted to each television through a television distributor.

After the set-top box modulates the transmission stream to obtain an RF output signal, the RF output signal can be output to a television distributor through a cable television line, and then the television distributor outputs the RF output signal to each secondary television connected to the television distributor, so that the secondary television watches television programs in a specified program range.

Because the set-top box processes the signals corresponding to the program information in the appointed program range, the auxiliary television can select programs from the programs for watching through the television remote controller.

In this embodiment, after receiving the RF input signal, the set-top box may select a corresponding frequency point in the RF input signal according to each program information in the designated program range, that is, select a corresponding frequency point in the RF input signal according to the program information selected by the user, and demodulate the frequency point, which may implement simultaneous demodulation and output of multiple channels of programs, where the output signal includes signals of all television programs in the designated program range, and the signals may be distributed to multiple televisions through the television distributor, so that the televisions can each watch the television programs in the designated program range, and therefore, one set-top box may enable multiple televisions to watch the television programs independently, thereby reducing the cost of watching the television programs by multiple televisions.

In the above description of the television signal transmission method according to the present invention from the perspective of the set-top box, and in the following description of the television signal transmission method according to the present invention from the perspective of the television, referring to fig. 2, another embodiment of the television signal transmission method according to the present invention includes:

201. receiving, by the television distributor, an RF output signal transmitted by the set-top box;

in this embodiment, the auxiliary television may receive an RF output signal sent by the set-top box through the television distributor, where the RF output signal is obtained by the set-top box demodulating, descrambling, and modulating a corresponding frequency point in the RF input signal, and a specific obtaining process is similar to the process described in the embodiment shown in fig. 1, and is not described here again.

202. Selecting corresponding frequency points in the RF output signals according to the information of each program in the designated program range;

after the auxiliary television receives the RF output signal sent by the set-top box, a user can select a corresponding frequency point in the RF output signal according to the information of each program in the preset program range.

It should be noted that the program range in this embodiment is the same as the program range described in the embodiment shown in fig. 1, and is not described here again.

203. The selected frequency points in the RF output signal are demodulated to obtain a television signal.

After the auxiliary television selects the frequency point, the frequency point can be demodulated and the subsequent signal processing operation is performed to obtain a television signal, so that the auxiliary television can store the signal of each program in the specified program range, and then the corresponding television program can be played to the user according to the remote control of the user on the auxiliary television.

In this embodiment, the auxiliary tv may receive the RF output signal sent by the set-top box through the tv distributor, and the RF output signal is obtained by the set-top box demodulating, descrambling, and modulating the corresponding frequency point in the RF input signal, so that the auxiliary tv can watch tv programs within a specified program range, and thus, multiple tvs can watch tv programs independently by using one set-top box, thereby reducing the cost of watching tv programs by multiple tvs.

For ease of understanding, the following description of the television signal transmission method according to the present invention is provided in an embodiment, and refer to fig. 3:

an RF input signal is input into a demodulator of the set-top box, the RF input signal can comprise a plurality of frequency points, each frequency point can bear a plurality of paths of digital programs, the RF input signal is from a program signal of an operator, and all program information is contained in the RF input signal.

In this embodiment, a user may set a program range on the set-top box in advance, where the program range refers to a range of television programs that can be watched by the secondary television (i.e., the televisions B, C, and D shown in fig. 3), the range may be set by himself according to a user requirement, and a set interface may be as shown in fig. 4.

In the setup page of fig. 4, the user can see the complete program list, and the user selects and edits the program list output personally on the basis of inputting the program list.

The frequency point of the output program can generally use a default value, the set-top box is set according to the frequency point of the national standard to reasonably distribute resources, or the frequency point set by the user can also be used, and the specific point is not limited here.

The user can select digital or analog signals to output according to the situation supported by the television:

because one frequency point of the digital signal can bear multiple programs (for example, one frequency point can bear 6 programs if the code rate of one program is 6M) and one frequency point of the analog signal can only bear one program, when the user selects the output type to be digital, the RF output signal can output more programs.

In this embodiment, the basic format information of the program information input to the set-top box may be as shown in table 1:

TABLE 1

Serial number	Program title	Frequency point	Program number
					1	One station at the center	63MHz	Program	1
2	Two stations in the center	63MHz	Program	2
					3	Three stations in the center	651MHz	Program	1
4	Four stations in the center	659MHz	Program	1
					5	Five central stations	677MHz	Program	1

The "frequency point" in table 1 refers to the frequency point where the program is located, and the "program number" is used to distinguish different programs located at the same frequency point.

It should be noted that only part of the program information is displayed in fig. 4 and table 1, and the formats of other program information are similar, and are not limited herein.

Assuming that the user selects one, two and five of the central televisions as the auxiliary televisions to watch the programs, and the main television (i.e., television a) directly connected to the set-top box is also watching the program of the central television, the set-top box will generate an output program list, as shown in table 2:

TABLE 2

The "output frequency point" in table 2 indicates the frequency point in the RF output signal where the program is located, and the "program number" is used to distinguish different programs at the same frequency point.

After the set-top box determines the output program list, the demodulator is used for performing frequency locking demodulation on all input frequency points in the output program list to obtain a scrambled TS, wherein the scrambled TS comprises scrambled program information of a central station I, a central station II and a central station V.

The descrambler descrambles the scrambled TS to obtain the TS, and the TS comprises program information descrambled by one central station, two central stations and five central stations.

A part of the TS including the program information of the central station is input to a decoder, the decoder decodes the TS to generate an audio/Video Signal, and the audio/Video Signal is directly output to the tv a through a High Definition Multimedia Interface (HDMI), a color difference component Interface (YPbPr), a Composite Video Broadcast Signal (CVBS), or other similar interfaces for playing, so that the tv a can view the content of the central station.

The other path of TS is input to a digital modulator for modulation, and the digital modulator modulates the descrambled program information of the central one, the central two and the central five stations in the TS to obtain an RF output signal.

It should be noted that, considering that some televisions in the auxiliary television may not support a digital mode, after the decoder decodes the TS to generate the audio/video signal, the audio/video signal may also be input to the digital-to-analog conversion modulator to be analog-modulated, and the result of modulation and the result of the digital modulator are used as the RF output signal.

It will be appreciated that if the secondary television supports digital mode, a digital to analog conversion modulator may not be required.

The RF output signal reaches each auxiliary television through the television distributor, the auxiliary television can search programs in the RF output signal by adopting the automatic television searching function, the auxiliary television can determine and demodulate the frequency point of 56MHz according to the content of the table 2 to obtain programs of the central one, the central two and the central five, and a user of the auxiliary television can control the auxiliary television to perform operations such as program switching, sound control and the like by using a remote controller of the auxiliary television.

It should be noted that if only one auxiliary tv is provided in the practical application, the RF output signal may be directly connected to the auxiliary tv without a tv distributor.

In this embodiment, after receiving the RF input signal, the set-top box may select a corresponding frequency point in the RF input signal according to each program information in the designated program range, and demodulate the frequency point, which may implement simultaneous demodulation and output of multiple programs, where the output signal includes signals of all television programs in the designated program range, and the signals may be distributed to multiple televisions through the television distributor, so that the televisions can each watch the television program in the designated program range, and thus, using one set-top box may enable multiple televisions to watch the television program independently, thereby reducing the cost of watching the television program by multiple televisions.

Secondly, providing the television programs for the corresponding televisions according to the program information of the target program currently selected by the user:

in the above embodiment, a user may set a program range on a set-top box in advance, and the set-top box may output program signals in the program range to each secondary television, and the secondary television watches the programs, because of the limitation of the processing capability of the set-top box, the program range is generally not settable, when the output mode is digital, generally not more than 40 programs, when the output mode is analog, generally not more than 10 programs, so that the secondary television may not watch all the television programs, and another television signal transmission method in the present invention is described below:

referring to fig. 5, another embodiment of the television signal transmission method according to the present invention includes:

501. receiving an RF input signal and a control signal;

It should be noted that the set-top box may further receive a control signal from the auxiliary television, the control signal may be sent by a remote controller bound to the auxiliary television, the remote controller may send the control signal to the set-top box in a manner of an RF wireless channel, an infrared channel, a cable television cable, or the like, and may also send the control signal in other manners, which is not limited herein.

The control signal in this embodiment corresponds to program information of a target program selected by a user, where the target program is used to indicate a program that the secondary television currently desires to watch. In this embodiment, it can also be understood that the control signal includes program information of a target program selected by the user, and the control signal is used for requesting the set top box by the secondary television to request to play the target program corresponding to the program information selected by the user and included in the control signal.

502. Selecting a corresponding frequency point in the RF input signal according to the program information of the target program selected by the user;

in this embodiment, after the set-top box receives the control signal, the program information of the target program is analyzed from the control signal, and the corresponding frequency point is selected from the RF input signal according to the program information of the target program.

503. Demodulating the frequency point to obtain a scrambled transmission stream;

504. descrambling the scrambled transmission stream to obtain a transmission stream;

the processing procedure of the signals in steps 503 to 504 in this embodiment is common knowledge of those skilled in the art, and is not limited herein.

505. Modulating the transport stream to obtain an RF output signal;

506. The RF output signal is transmitted to each television through a television distributor.

After the set-top box modulates the transmission stream to obtain an RF output signal, the RF output signal can be output to the television distributor through the cable television line, and then the television distributor outputs the RF output signal to each auxiliary television connected to the television distributor, so that the auxiliary television watches the corresponding television program according to the program information of the target program.

Because the set-top box processes the signal corresponding to the program information of the target program, the auxiliary television can watch the target program through the television remote controller.

In this embodiment, after receiving the RF input signal and the control signal, the set-top box may select a corresponding frequency point in the RF input signal according to the program information of the target program selected by the user, and demodulate the frequency point, which may implement simultaneous demodulation and output of multiple programs, where the output signal includes a signal of the target program, and the signal may be distributed to multiple televisions through the television distributor, so that the televisions may watch the target program, and therefore, using one set-top box may enable multiple televisions to watch the television program independently, thereby reducing the cost of watching television programs by multiple televisions.

In the above description of the television signal transmission method according to the present invention from the perspective of the set-top box, and in the following description of the television signal transmission method according to the present invention from the perspective of the television, referring to fig. 6, another embodiment of the television signal transmission method according to the present invention includes:

601. sending a control signal to the set-top box;

in this embodiment, the remote controller bound to the television may send a control signal to the set-top box, where the control signal includes program information of a target program selected by a user, and the target program is used to indicate a program that the secondary television desires to watch currently.

The remote controller may send the control signal to the set-top box through an RF wireless channel, an infrared channel, a cable television cable, or the like, and may also send the control signal in other manners, which is not limited herein.

602. Receiving, by the television distributor, an RF output signal transmitted by the set-top box;

in this embodiment, the auxiliary television may receive an RF output signal sent by the set-top box through the television distributor, where the RF output signal is obtained by the set-top box demodulating, descrambling, and modulating a corresponding frequency point in the RF input signal, and a specific obtaining process is similar to the process described in the embodiment shown in fig. 5, and is not described here again.

603. Selecting a corresponding frequency point in the RF output signal according to the program information selected by the user;

after receiving the RF output signal sent by the set-top box, the auxiliary television may select a corresponding frequency point in the RF output signal according to program information of a target program in a control signal sent by a remote controller previously bound to the auxiliary television.

604. The selected frequency points in the RF output signal are demodulated to obtain a television signal.

After the auxiliary television selects the frequency point, the frequency point can be demodulated and the subsequent signal processing operation is carried out to obtain a television signal, and then the auxiliary television can watch a target program.

In this embodiment, the auxiliary tv may receive the RF output signal sent by the set-top box through the tv distributor, and the RF output signal is obtained by demodulating, descrambling, and modulating the corresponding frequency point in the RF input signal by the set-top box, so that the auxiliary tv can watch the target program, and thus, multiple tvs can watch tv programs independently by using one set-top box, thereby reducing the cost of watching tv programs by multiple tvs.

For ease of understanding, the following description of the television signal transmission method according to the present invention is provided by way of an embodiment, and refer to fig. 7:

In this embodiment, a user may bind in advance a corresponding relationship between each remote controller and each secondary television (i.e., televisions B, C, and D shown in fig. 7), a binding process may be set by the user, and a set interface may be as shown in fig. 8.

In the setting page of fig. 8, the user can bind the corresponding relationship between the remote controller and the television, and the specific binding process is not limited here.

It should be noted that, if the main television (television a) is directly connected to the set-top box, the television a may also use another remote control method, or the set-top box is controlled by the user directly pressing a switch on the set-top box, so that the relationship between the television a and the remote controller does not need to be bound.

The frequency points of the programs output by the set-top box generally use default values, the set-top box sets the frequency points according to the national standard to reasonably distribute resources, or the frequency points set by the user can be used, and the specific details are not limited herein.

In this embodiment, the basic format information of the program information input to the set-top box may be as shown in table 3:

TABLE 3

The "frequency point" in table 3 refers to the frequency point where the program is located, and the "program number" is used to distinguish different programs located at the same frequency point.

Note that, only part of the program information is displayed in table 3, and the formats of other program information are similar, and are not limited here.

Assuming that the set-top box receives two control signals, which are respectively sent by the remote controllers bound to the television a and the television B, wherein the program information of the target program in the control signal sent by the television a is two in the center, and the program information of the target program in the control signal sent by the television B is five in the center, the set-top box generates an output program list, which is specifically shown in table 4:

TABLE 4

The "output frequency point" in table 4 represents the frequency point in the RF output signal where the program is located, and the "program number" is used to distinguish different programs at the same frequency point, and since one frequency point of the digital signal can carry multiple programs, when multiple programs are at the same frequency point, the program numbers need to be used for distinguishing.

After the set-top box determines the output program list, the demodulator is used for performing frequency locking demodulation on all input frequency points in the output program list to obtain a scrambled TS, wherein the scrambled TS comprises scrambled program information of a central second station and a central fifth station, and the demodulator in the embodiment can simultaneously demodulate multiple frequency points.

The descrambler descrambles the scrambled TS to obtain the TS, the TS comprises descrambled program information of the central second station and the central fifth station, and the descrambler in the embodiment can descramble multiple programs simultaneously.

The part of the TS containing the central station two is input into a decoder, the decoder decodes the TS to generate audio and video signals, and the audio and video signals are directly output to a television A for playing through an HDMI (high definition multimedia interface), YPbPr (YPbPr), CVBS (composite video broadcast system) interface or other similar interfaces, so that the television A can watch the content of the central station two.

The other path of TS is input to a digital modulator for modulation, and the digital modulator modulates the descrambled program information of the central two stations and the central five stations in the TS to obtain an RF output signal.

The RF output signal reaches each auxiliary television through the television distributor, the auxiliary television can search programs in the RF output signal by adopting the automatic television searching function, and the frequency point of 561MHz is determined to be demodulated in the table 4 according to the program information of the target program, so that the programs of five central stations can be watched.

The user of the auxiliary television can continue to control the set-top box by using the remote controller bound with the auxiliary television, thereby realizing the operations of program switching, sound control and the like.

In this embodiment, after receiving the RF input signal and the control signal, the set-top box may select a corresponding frequency point in the RF input signal according to the program information of the target program, and demodulate the frequency point, which may implement simultaneous demodulation and output of multiple programs, where the output signal includes a signal of the target program, and the signal may be distributed to multiple televisions through a television distributor, so that the televisions may watch the target program, and therefore, using one set-top box may enable multiple televisions to watch the television program independently, thereby reducing the cost of watching the television program by multiple televisions.

Referring to fig. 9, an embodiment of the set-top box of the present invention includes:

a signal input 901 for receiving a radio frequency carrier RF input signal;

the signal demodulator 902 is used for selecting a corresponding frequency point in the RF input signal according to the program information selected by the user and demodulating the frequency point to obtain a scrambled transmission stream;

a signal descrambler 903, configured to descramble the scrambled transport stream to obtain a transport stream;

a signal modulator 904 for modulating the transport stream to obtain an RF output signal;

a signal output 905 for transmitting the RF output signal to each television through the television distributor so that the television views the corresponding television program.

The signal demodulator 902 in this embodiment may be specifically configured to select a corresponding frequency point in the RF input signal according to the preset program information in the program range selected by the user, and demodulate the frequency point to obtain the scrambled transport stream.

The set-top box in this embodiment may further include:

and a signal decoder 906, configured to decode the transport stream obtained by the signal descrambler and output the transport stream to a television directly connected to the set-top box.

The signal modulator 904 in this embodiment may specifically include:

a digital modulator for digitally modulating the transport stream to obtain a digital RF output signal;

and/or the presence of a gas in the gas,

the digital-to-analog conversion modulator is used for carrying out digital-to-analog conversion modulation on the transmission stream to obtain an analog RF output signal;

the digital RF output signal and the analog RF output signal include output frequency point information, which is a default frequency point or a frequency point set by a user.

For the sake of understanding, the following describes the relationship between the units of the set-top box in this embodiment with a specific example:

in this embodiment, the signal input end 901 may receive an RF input signal from a server of a digital television operator, where the RF input signal may include a plurality of frequency points, and each frequency point may carry a plurality of channels of digital programs.

After the signal input end 901 receives the RF input signal, the signal demodulator 902 may select a corresponding frequency point in the RF input signal according to each program information in the designated program range, that is, search for the frequency point where the program information is located, and demodulate the frequency point to obtain a scrambled transport stream;

the signal descrambler 903 descrambles the scrambled transmission stream to obtain a transmission stream;

after the signal descrambler 903 obtains the transport stream, the signal modulator 904 may re-modulate the transport stream, and the specific modulation manner may be digital modulation, or digital-to-analog conversion modulation, or other types of modulation manners, which is not limited herein.

After the signal modulator 904 modulates the transport stream to obtain the RF output signal, the signal output end 905 may output the RF output signal to the television distributor through the cable television line, and the television distributor outputs the RF output signal to each secondary television connected to the television distributor, so that the secondary television watches the television program within the designated program range.

In this embodiment, after the signal input end 901 receives the RF input signal, the signal demodulator 902 may select a corresponding frequency point in the RF input signal according to each program information in the designated program range, and demodulate the frequency point, which may implement simultaneous demodulation and output of multiple programs, where the output signal includes signals of all television programs in the designated program range, and the signals may be distributed to multiple televisions through the television distributor, so that the televisions can watch the television programs in the designated program range, respectively, therefore, using one set top box may enable multiple televisions to watch the television programs independently, thereby reducing the cost of watching the television programs by multiple televisions.

It should be noted that, in the above embodiment, it is described by taking an example that the signal demodulator specifically selects a corresponding frequency point in the RF input signal according to each program information in the designated program range, and demodulates the frequency point to obtain the scrambled transport stream, in practical application, the set-top box in this embodiment may further include a control signal receiver, and at this time, the signal demodulator may select a corresponding frequency point in the RF input signal according to the program information of the target program corresponding to the control signal, and demodulate the frequency point to obtain the scrambled transport stream, specifically referring to fig. 10, another embodiment of the set-top box in the present invention includes:

a signal input 1001 for receiving a radio frequency carrier RF input signal;

a control signal receiver 1002 for receiving a control signal corresponding to program information of a target program selected by a user;

the signal demodulator 1003 is configured to select a corresponding frequency point from the RF input signal according to the program information of the target program, and demodulate the frequency point to obtain a scrambled transport stream;

a signal descrambler 1004 for descrambling the scrambled transport stream to obtain a transport stream;

a signal modulator 1005 for modulating the transport stream to obtain an RF output signal;

the signal output 1006 sends the RF output signal to each television through the television distributor so that the television views the corresponding television program.

The set-top box in this embodiment may further include:

and a signal decoder 1007, configured to decode the transport stream obtained by the signal descrambler and output the transport stream to a television directly connected to the set-top box.

The signal modulator 1005 in this embodiment may specifically include:

and/or the presence of a gas in the gas,

in this embodiment, the signal input terminal 1001 may receive an RF input signal from a server of a digital television operator, where the RF input signal may include a plurality of frequency points, and each frequency point may carry a plurality of channels of digital programs.

It should be noted that the control signal receiver 1002 may further receive a control signal from the secondary television, the control signal may be sent by a remote controller bound to the secondary television, the remote controller may send the control signal to the set-top box through an RF wireless channel, an infrared channel, a cable television cable, or the like, and the control signal may also be sent in other manners, which is not limited herein.

The control signal in this embodiment includes program information of a target program, where the target program is used to indicate a program that the secondary television currently desires to watch.

In this embodiment, after the control signal receiver 1002 receives the control signal, the signal demodulator 1003 analyzes the program information of the target program from the control signal, selects a corresponding frequency point in the RF input signal according to the program information of the target program, and demodulates the frequency point to obtain a scrambled transport stream;

the signal descrambler 1004 descrambles the scrambled transport stream to obtain a transport stream;

after the signal descrambler 1004 obtains the transport stream, the signal modulator 1005 may re-modulate the transport stream, and the specific modulation method may be digital modulation, or digital-to-analog conversion modulation, or other types of modulation methods, which is not limited herein.

After the signal modulator 1005 modulates the transport stream to obtain an RF output signal, the signal output terminal 1006 may output the RF output signal to the television distributor through the cable television line, and the television distributor may output the RF output signal to each of the auxiliary televisions connected to the television distributor, so that the auxiliary televisions view the corresponding television programs according to the program information of the target program.

In this embodiment, after the signal input terminal 1001 and the control signal receiver 1002 receive the RF input signal and the control signal, the signal demodulator 1003 may select a corresponding frequency point in the RF input signal according to program information of a target program, and demodulate the frequency point, which may realize simultaneous demodulation and output of multiple channels of programs, where the output signal includes a signal of the target program, and the signal may be distributed to multiple televisions through a television distributor, so that the televisions can watch the target program, and thus, a set-top box may enable multiple televisions to watch television programs independently, thereby reducing the cost of watching television programs with multiple televisions.

Referring to fig. 11, a television according to an embodiment of the present invention is described below, where the television according to the embodiment of the present invention includes:

a signal receiving terminal 1101, configured to receive a radio frequency carrier RF output signal sent by a set-top box through a television distributor, where the RF output signal is obtained by the set-top box demodulating, descrambling, and modulating a corresponding frequency point in an RF input signal;

a signal selector 1102 for selecting a corresponding frequency point in the RF output signal according to the program information selected by the user;

a signal processor 1103 configured to demodulate the frequency points selected in the RF output signal to obtain a television signal.

The signal selector 1102 in this embodiment may specifically select a corresponding frequency point in the RF output signal according to each program information in the designated program range, or may also select a corresponding frequency point in the RF output signal according to the program information of the target program selected by the user.

In this embodiment, first, an example of "selecting a corresponding frequency point in an RF output signal according to program information in a designated program range" is described:

in this embodiment, the signal receiving end 1101 may receive an RF output signal sent by a set-top box through a television distributor, where the RF output signal is obtained by the set-top box demodulating, descrambling, and modulating a corresponding frequency point in an RF input signal, and a specific obtaining process is similar to the process described in the embodiment shown in fig. 1, and is not described here again.

After the signal receiving end 1101 receives the RF output signal sent by the set-top box, the signal selector 1102 may select a corresponding frequency point in the RF output signal according to each program information in the designated program range.

After the signal selector 1102 selects the frequency point, the signal processor 1103 may demodulate the frequency point and perform subsequent signal processing operations to obtain a television signal, and the secondary television may store signals of programs in a designated program range, and then may play a corresponding television program to a user according to a remote control of the secondary television by the user.

In this embodiment, the signal receiving terminal 1101 may receive an RF output signal sent by the set-top box through the television distributor, where the RF output signal is obtained by the set-top box demodulating, descrambling, and modulating a corresponding frequency point in the RF input signal, so that the secondary television can watch television programs within a specified program range, and thus, multiple televisions can watch television programs independently by using one set-top box, thereby reducing the cost of watching television programs by multiple televisions.

In the above embodiment, the signal selector selects a corresponding frequency point in the RF output signal according to each program information in the designated program range, and in practical applications, the signal selector may also select a corresponding frequency point in the RF output signal according to the program information of the target program selected by the user, specifically referring to fig. 12, another embodiment of the television of the present invention includes:

a sending end 1201, configured to send a control signal to a set-top box, where the control signal corresponds to program information of a target program selected by a user;

a signal receiving end 1202, configured to receive, through a television distributor, a radio frequency carrier RF output signal sent by a set-top box, where the RF output signal is obtained by the set-top box demodulating, descrambling, and modulating a frequency point corresponding to program information of a target program in an RF input signal;

a signal selector 1203, configured to select a corresponding frequency point in the RF output signal according to program information of the target program;

a signal processor 1204 is used for demodulating the frequency points selected in the RF output signal to obtain a television signal.

For ease of understanding, the relationship between the units of the tv in this embodiment is described below with a specific example:

in this embodiment, the remote controller bound to the television or the sending end 1201 of the television may send a control signal to the set-top box, where the control signal includes program information of a target program, and the target program is used to indicate a program that the secondary television desires to watch currently.

The sending end 1201 may send a control signal to the set-top box through an RF wireless channel, an infrared channel, a cable television cable, or the like, and may also send a control signal in other manners, which is not limited herein.

In this embodiment, the signal receiving end 1202 may receive, through the television distributor, an RF output signal sent by the set-top box, where the RF output signal is obtained by the set-top box demodulating, descrambling, and modulating a corresponding frequency point in the RF input signal, and a specific obtaining process is similar to the process described in the embodiment shown in fig. 5, and is not described here again.

After the signal receiving end 1202 receives the RF output signal sent by the set-top box, the signal selector 1203 may select a corresponding frequency point in the RF output signal according to the program information of the target program in the control signal sent by the sending end 1201.

After the signal selector 1203 selects the frequency point, the signal processor 1204 may demodulate the frequency point and perform subsequent signal processing operations to obtain a television signal, and the auxiliary television may view the target program.

In this embodiment, the signal receiving terminal 1202 may receive an RF output signal sent by the set-top box through the television distributor, where the RF output signal is obtained by the set-top box demodulating, descrambling, and modulating a corresponding frequency point in the RF input signal, so that the auxiliary television can watch a target program, and thus, multiple televisions can watch television programs independently by using one set-top box, thereby reducing the cost of watching television programs by multiple televisions.

Referring to fig. 13, a television signal transmission system according to an embodiment of the present invention is described below, where the television signal transmission system according to the embodiment of the present invention includes:

a set-top box 1301, a television distributor 1302, a plurality of televisions 1303 and a main television 1304;

the set top box 1301 in this embodiment may be similar to the set top box described in the embodiment shown in fig. 9, and details are not described here;

the television 1303 in this embodiment may be similar to the television described in the embodiment shown in fig. 11, and is not described here again. Or,

the set top box 1301 in this embodiment may be similar to the set top box described in the embodiment shown in fig. 10, and is not described again here;

the television 1303 in this embodiment may be similar to the television described in the embodiment shown in fig. 12, and is not described here again.

It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by hardware that is related to instructions of a program, and the program may be stored in a computer-readable storage medium, where the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

While the television signal transmission method, the set-top box and the television provided by the present invention have been described in detail, for those skilled in the art, according to the idea of the embodiment of the present invention, the specific implementation manner and the application scope may be changed, and in summary, the content of the present description should not be construed as limiting the present invention.

Claims

1. A television signal transmission method, comprising:

receiving a radio frequency carrier (RF) input signal;

selecting a corresponding frequency point in the RF input signal according to the program information selected by the user;

demodulating the frequency point to obtain a scrambled transmission stream;

descrambling the scrambled transmission stream to obtain a transmission stream;

modulating the transport stream to obtain an RF output signal;

and transmitting the RF output signal to each television through a television distributor so that the television watches the corresponding television program.

2. The method of claim 1, wherein the step of selecting a corresponding frequency point in the RF input signal according to the program information selected by the user comprises:

and selecting corresponding frequency points in the RF input signal according to the preset information of each program in the program range selected by the user.

3. The method of claim 1, wherein the step of selecting a corresponding frequency point in the RF input signal according to the program information selected by the user comprises:

receiving a control signal corresponding to program information of a target program selected by a user;

and selecting a corresponding frequency point in the RF input signal according to the program information of the target program selected by the user.

4. The method of any of claims 1-3, wherein the set top box modulating the transport stream to an RF output signal comprises:

carrying out digital modulation on the transport stream to obtain a digital RF output signal, and/or carrying out digital-to-analog conversion modulation on the transport stream to obtain an analog RF output signal;

the digital RF output signal and the analog RF output signal contain output frequency point information, and the output frequency point information is a default frequency point or a frequency point set by a user.

5. The method of claim 1, wherein descrambling the scrambled transport stream into a transport stream further comprises:

and decoding the transport stream and then sending the transport stream to a television connected with the set top box through an audio and video interface.

6. A television signal transmission method, comprising:

receiving a radio frequency carrier RF output signal sent by a set top box through a television distributor, wherein the RF output signal is obtained by demodulating, descrambling and modulating a corresponding frequency point in an RF input signal by the set top box;

selecting a corresponding frequency point in the RF output signal according to the program information selected by the user;

and demodulating the frequency points selected from the RF output signals to obtain television signals.

7. The method of claim 6, further comprising:

sending a control signal to the set top box, wherein the control signal corresponds to the program information of the target program selected by the user;

selecting a corresponding frequency point in the RF output signal according to the program information;

and selecting a corresponding frequency point in the RF output signal according to the program information of the target program.

8. A set top box, comprising:

a signal input for receiving a radio frequency carrier, RF, input signal;

the signal demodulator is used for selecting a corresponding frequency point in the RF input signal according to the program information selected by the user and demodulating the frequency point to obtain a scrambled transmission stream;

a signal descrambler, configured to descramble the scrambled transport stream to obtain a transport stream;

a signal modulator for modulating the transport stream to obtain an RF output signal;

and the signal output end is used for transmitting the RF output signal to each television through a television distributor so that the television watches the corresponding television program.

9. The set top box of claim 8, wherein the signal demodulator is further configured to select a corresponding frequency point in the RF input signal according to preset program information in a program range selected by a user, and demodulate the frequency point to obtain a scrambled transport stream.

10. The set-top box according to claim 8, further comprising:

a control signal receiver for receiving a control signal corresponding to program information of a target program selected by a user;

the signal demodulator is specifically configured to select a corresponding frequency point in the RF input signal according to the program information of the target program selected by the user, and demodulate the frequency point to obtain a scrambled transport stream.

11. The set-top box according to any one of claims 8 to 10, further comprising:

and the signal decoder is used for decoding the transmission stream obtained by the signal descrambler.

12. A set-top box according to any one of claims 8 to 10, wherein the signal modulator comprises:

a digital modulator for digitally modulating the transport stream to obtain a digital RF output signal; and/or the presence of a gas in the gas,

13. A television, comprising:

the system comprises a signal receiving end and a signal processing end, wherein the signal receiving end is used for receiving a radio frequency carrier RF output signal sent by a set top box through a television distributor, and the RF output signal is obtained by demodulating, descrambling and modulating a corresponding frequency point in an RF input signal through the set top box;

the signal selector is used for selecting corresponding frequency points in the RF output signals according to the program information in the program range selected by the user;

and the signal processor is used for demodulating the frequency points selected from the RF output signals to obtain television signals.

14. The television of claim 13, further comprising:

the sending end is used for sending a control signal to the set top box, wherein the control signal corresponds to the program information of the target program selected by the user;

the signal selector is specifically configured to select a corresponding frequency point in the RF output signal according to the program information of the target program selected by the user.