CN107786892B - Method and device for broadcasting digital television and readable storage medium - Google Patents
Method and device for broadcasting digital television and readable storage medium Download PDFInfo
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- CN107786892B CN107786892B CN201711038507.6A CN201711038507A CN107786892B CN 107786892 B CN107786892 B CN 107786892B CN 201711038507 A CN201711038507 A CN 201711038507A CN 107786892 B CN107786892 B CN 107786892B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
- H04N21/440263—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by altering the spatial resolution, e.g. for displaying on a connected PDA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
- H04N21/44209—Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/84—Generation or processing of descriptive data, e.g. content descriptors
Abstract
The invention discloses a method and a device for broadcasting a digital television and a readable storage medium. The invention receives the current television signal transmitted by a wireless transmitting end through a two-way layer; detecting the signal intensity of the current television signal to obtain a signal intensity detection result; the signal intensity grade of the current television signal is determined according to the signal intensity detection result, the video resolution level corresponding to the signal intensity grade is extracted from the current television signal according to the signal intensity grade, and the resolution video corresponding to the video resolution level is obtained according to the video resolution level to realize digital television playing.
Description
Technical Field
The present invention relates to the field of television technologies, and in particular, to a method and an apparatus for playing digital television, and a readable storage medium.
Background
The satellite pan can be used in places such as hotels, scientific research institutions, schools and the like, and can also be widely applied to national guidelines such as digital television village-to-village communication and the like popularized in rural areas.
The satellite pan is a metal paraboloid, can reflect satellite signals to a feed source and a tuner positioned at the focus of the satellite antenna, collects weak signals transmitted by the satellite and carries out television watching. Generally, the larger the caliber of the satellite pan, the stronger the signal of the program, and the higher the reception quality. However, in consideration of factors such as cost and installation, the smaller the diameter of the pot of the satellite, the better the pot diameter is, and thus the strength of receiving signals transmitted from the satellite is limited.
However, when the user encounters an extreme weather such as cloudy weather or rain or snow, due to the shielding of the thick cloud layer, the originally weak signal is weakened by times, so that the television signal received by the user is blocked and even cannot be received at all.
Disclosure of Invention
The invention mainly aims to provide a method and a device for broadcasting digital televisions and a readable storage medium, and aims to solve the problem that the television signals of the existing satellite pot are weak or even the digital televisions cannot be broadcasted in severe weather.
In order to achieve the above object, the present invention provides a method for broadcasting digital television, comprising the steps of:
receiving a current television signal transmitted by a digital television wireless transmitting end through a two-way layer, wherein the current television signal comprises a first television signal in a first transmission layer and a second television signal in a second transmission layer, and the bandwidth of the second transmission layer is greater than that of the first transmission layer;
detecting the signal strength of the second television signal to determine a signal strength value of the second television signal;
determining the signal intensity level of the current television signal according to the signal intensity value of the second television signal;
and extracting a video resolution level corresponding to the signal intensity level from the first television signal or the second television signal according to the signal intensity level, and acquiring a resolution video corresponding to the video resolution level according to the video resolution level to realize digital television playing.
Preferably, the determining the signal strength level of the current television signal according to the signal strength value of the second television signal specifically includes:
and comparing the signal intensity value of the second television signal with a preset signal intensity threshold value, and determining the signal intensity level of the current television signal according to the comparison result.
Preferably, the first television signal comprises a first video resolution level, the preset signal strength threshold comprises a first preset signal strength threshold and a second preset signal strength threshold, and the second preset signal strength threshold is greater than the first preset signal strength threshold;
correspondingly, the comparing the signal strength value of the second television signal with a preset signal strength threshold value, and determining the signal strength level of the current television signal according to the comparison result, further includes:
comparing the signal intensity value of the second television signal with a preset signal intensity threshold, and when the signal intensity value of the second television signal is smaller than the first preset signal intensity threshold, judging that the signal intensity level of the current television signal is a first signal intensity level;
correspondingly, the extracting, according to the signal strength level, a video resolution level corresponding to the signal strength level from the first television signal or the second television signal, and obtaining, according to the video resolution level, a resolution video corresponding to the video resolution level to implement digital television playing specifically include:
and extracting a first video resolution level corresponding to the first signal intensity level from a first television signal according to the first signal intensity level, and acquiring a resolution video corresponding to the first video resolution level according to the first video resolution level to realize digital television playing.
Preferably, the signal strength levels further comprise a second signal strength level, the second signal strength level being greater than the first signal strength level;
the second television signal comprises a second video resolution level, and the resolution corresponding to the second video resolution level is greater than the resolution corresponding to the first video resolution level;
correspondingly, after the first video resolution level corresponding to the first signal strength level is selected from the first television signal according to the first signal strength level and the resolution video corresponding to the first video resolution level is obtained according to the first video resolution level to realize the digital television playing, the method further includes:
when the signal intensity value of the second television signal is detected to be larger than the second preset signal intensity threshold value, judging the signal intensity level of the second television signal to be a second signal intensity level;
and selecting a second video resolution level corresponding to the second signal intensity level from the second television signals according to the second signal intensity level, and acquiring a resolution video corresponding to the second video resolution level according to the second video resolution level to continue playing the digital television.
Preferably, the first television signal in the first transmission stage is transmitted by a quadrature phase shift keying modulation scheme.
In addition, to achieve the above object, the present invention also provides an apparatus for broadcasting digital tv, the apparatus comprising: a memory, a processor and a broadcast digital television program stored on the memory and executable on the processor, the broadcast digital television program configured to implement the steps of the broadcast digital television method as described above.
In addition, to achieve the above object, the present invention also provides a computer readable storage medium having a broadcast digital television program stored thereon, which when executed by a processor implements the steps of the method for broadcasting digital television as described above.
The method comprises the steps that firstly, a current television signal transmitted by a digital television wireless transmitting end through a double-channel layer is received, wherein the current television signal comprises a first television signal in a first transmission layer and a second television signal in a second transmission layer, the bandwidth of the second transmission layer is larger than that of the first transmission layer, namely, a television signal with strong anti-interference capability exists in the current television signal in severe weather by utilizing a hierarchical modulation principle of the digital television; then detecting the signal strength of the second television signal to determine the signal strength value of the second television signal; determining the signal intensity level of the current television signal according to the signal intensity value of the second television signal; and finally, extracting a video resolution level corresponding to the signal intensity level from the first television signal or the second television signal according to the signal intensity level so as to realize digital television playing. The invention can automatically switch to proper resolution ratio according to the signal intensity level of the current television signal under the same program which needs to be broadcast by the digital television, thereby solving the problem that the television signal of the satellite pot is weak or even can not be broadcast under severe weather.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus for broadcasting digital television in a hardware operating environment according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a first embodiment of a method for broadcasting digital tv according to the present invention;
fig. 3 is a flowchart illustrating a method for broadcasting digital tv according to a second embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an apparatus for broadcasting digital television in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the apparatus for broadcasting digital television may include: a processor 1001 such as a CPU, a communication bus 1002, a digital television interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The digital television interface 1003 is used for connecting a television. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high speed RAM memory. The device for broadcasting the digital television is characterized as a digital television receiving end, and the device can be a digital television receiver.
Those skilled in the art will appreciate that the configuration of the apparatus shown in fig. 1 does not constitute a limitation of the apparatus for presenting digital television, and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, the memory 1005 may include an operating system, a network communication module, a digital television interface module, and a broadcast digital television program.
In the apparatus shown in fig. 1, the digital television interface 1003 is mainly used for connecting a television and performing data communication with the television; the apparatus calls, via the processor 1001, a broadcast digital television program stored in the memory 1005 and performs the following operations:
receiving a current television signal transmitted by a digital television wireless transmitting end through a two-way layer, wherein the current television signal comprises a first television signal in a first transmission layer and a second television signal in a second transmission layer, and the bandwidth of the second transmission layer is greater than that of the first transmission layer;
detecting the signal strength of the second television signal to determine a signal strength value of the second television signal;
determining the signal intensity level of the current television signal according to the signal intensity value of the second television signal;
and extracting a video resolution level corresponding to the signal intensity level from the first television signal or the second television signal according to the signal intensity level, and acquiring a resolution video corresponding to the video resolution level according to the video resolution level to realize digital television playing.
Further, the apparatus may call, through the processor 1001, a broadcast digital tv program stored in the memory 1005, and further perform the following operations:
and comparing the signal intensity value of the second television signal with a preset signal intensity threshold value, and determining the signal intensity level of the current television signal according to the comparison result.
Further, the apparatus may call, through the processor 1001, a broadcast digital tv program stored in the memory 1005, and further perform the following operations:
comparing the signal intensity value of the second television signal with a preset signal intensity threshold, and when the signal intensity value of the second television signal is smaller than the first preset signal intensity threshold, judging that the signal intensity level of the current television signal is a first signal intensity level;
accordingly, the apparatus may invoke, via the processor 1001, a broadcast digital television program stored in the memory 1005, and also perform the following operations:
and extracting a first video resolution level corresponding to the first signal intensity level from a first television signal according to the first signal intensity level, and acquiring a resolution video corresponding to the first video resolution level according to the first video resolution level to realize digital television playing.
Further, the apparatus may call, through the processor 1001, a broadcast digital tv program stored in the memory 1005, and further perform the following operations:
when the signal intensity value of the second television signal is detected to be larger than the second preset signal intensity threshold value, judging the signal intensity level of the second television signal to be a second signal intensity level;
and selecting a second video resolution level corresponding to the second signal intensity level from the second television signals according to the second signal intensity level, and acquiring a resolution video corresponding to the second video resolution level according to the second video resolution level to continue playing the digital television.
The method comprises the steps that a current television signal transmitted by a digital television wireless transmitting end through a double-channel layer is received, wherein the current television signal comprises a first television signal in a first transmission layer and a second television signal in a second transmission layer, the bandwidth of the second transmission layer is larger than that of the first transmission layer, namely, a television signal with strong anti-jamming capability exists in the current television signal in severe weather by utilizing a hierarchical modulation principle of the digital television; then detecting the signal strength of the second television signal to determine the signal strength value of the second television signal; determining the signal intensity level of the current television signal according to the signal intensity value of the second television signal; and finally, extracting a video resolution level corresponding to the signal intensity level from the first television signal or the second television signal according to the signal intensity level so as to realize digital television playing. The embodiment can automatically switch to proper resolution according to the signal intensity level of the current television signal under the same program needing to be broadcast by the digital television, and further solves the problem that the television signal of the satellite pot is weak or even can not be broadcast under severe weather.
Based on the hardware structure, the embodiment of the method for broadcasting the digital television is provided. Referring to fig. 2, fig. 2 is a flowchart illustrating a method for broadcasting digital tv according to a first embodiment of the present invention.
S10: receiving a current television signal transmitted by a digital television wireless transmitting end through a two-way layer, wherein the current television signal comprises a first television signal in a first transmission layer and a second television signal in a second transmission layer, and the bandwidth of the second transmission layer is greater than that of the first transmission layer;
it should be noted that the execution subject of the method of the present embodiment may be a processor of the above-mentioned apparatus (i.e. digital television receiving end).
The digital television wireless transmitting end may be a digital television transmission relay station or an operator server, and certainly, may also be other devices with similar functions, which is not limited in this embodiment.
It can be understood that the present embodiment can use the existing digital tv hierarchical modulation technique to transmit by using a hierarchical two-way transmission hierarchy, thereby implementing transmission of tv signals at different hierarchies. The digital television receiver can receive the current television signal transmitted by the digital television wireless transmitting end through the two-way hierarchy. In this embodiment, the first transmission hierarchy is referred to as a low hierarchy for short, and the second transmission hierarchy is referred to as a high hierarchy for short, where the bandwidth of the high hierarchy is greater than that of the low hierarchy. The present television signal is transmitted by layers by using the layered modulation technology of the digital television, and the data of the code streams transmitted by different layers are different, which can be understood as the code streams transmitted by two physical networks, namely, the network transmission data rate of the high-level layer is high but is easy to be interfered, the network transmission data rate of the low-level layer is low but is not easy to be interfered, the two networks jointly form the present code stream (or the present television signal), and the transmission of the television signal is ensured by using the differentiated network.
In a specific implementation, for example, according to the ISDB specification of the isdn digital broadcasting, in the case of the ISDB specification (13 receiving bands in total, namely 13 segments), a television signal in a high level (namely, the second television signal) is modulated by using a 64QAM (Quadrature Amplitude Modulation) method, and is transmitted by using 12 segments, because the 64QAM Modulation method has a very high transmission rate (64QAM can support a peak transmission rate of 28Mbps at most in one 6MHz channel), it can be further ensured that the television signal is transmitted by using a main bandwidth in the high level in daily life (when the weather environment is normal), and the television signal includes a digital television broadcast high definition video (corresponding to a second video resolution level in the following text);
a television signal in a lower hierarchy (i.e., the first television signal) is modulated by using a QPSK (Quadrature Phase shift keying) method and transmitted by using a 1Segment, and the QPSK modulation method has the advantages of high modulation efficiency and strong interference rejection capability, and can ensure the signal quality of the first television signal even in severe weather; the low-level layer occupies only a small portion of the bandwidth, the first television signal in the low-level layer includes the most basic broadcast data for digital television broadcast, and the present embodiment adds low-definition video (corresponding to the first video resolution level hereinafter) data and audio data to the most basic broadcast data in the low-level layer.
S20: detecting the signal strength of the second television signal to determine a signal strength value of the second television signal;
it can be understood that, according to shannon's theorem (the larger the bandwidth is, the higher the transmission rate is, and the higher the snr is), the transmission rate of the tv signal (i.e. the second tv signal) of the high hierarchy (i.e. the second transmission hierarchy) is high, but the interference resistance is poor, and the bandwidth of the low hierarchy (i.e. the first transmission hierarchy) is small but the interference resistance is strong, so that the strength of the current tv signal only needs to be detected by detecting the second tv signal of the high hierarchy with the larger bandwidth.
S30: comparing the signal intensity value of the second television signal with a preset signal intensity threshold, and when the signal intensity value of the second television signal is smaller than the first preset signal intensity threshold, judging that the signal intensity level of the current television signal is a first signal intensity level;
it can be understood that, the embodiment may set a signal strength threshold in the factory setting of the apparatus in advance, compare the signal strength detection result of the current television signal with the preset signal strength threshold,
the preset signal intensity threshold comprises a first preset signal intensity threshold and a second preset signal intensity threshold, and the second preset signal intensity threshold is larger than the first preset signal intensity threshold;
determining the signal strength level of the current television signal according to the comparison result, this embodiment may define at least two signal strength levels: the television signal state is characterized as a weak signal state; and a second signal strength level indicating that the television signal state is a normal signal state, that is, the second signal strength level is greater than the first signal strength level. Accordingly, the present embodiment may further define a third signal strength level (which is used to represent that the television signal state is the no-signal state), a fourth signal strength level (which is used to represent that the television signal state is the super-strong signal state), and so on, which is not described herein again. And judging the current television signal intensity by presetting a threshold value, and further preparing for automatically switching to a step of proper resolution ratio according to the signal intensity level of the current television signal in the subsequent steps.
In a specific implementation, the preset signal strength threshold may be set by a television manufacturer according to a condition of the device itself, for example, the first preset signal strength threshold may be set to 17db, the second preset signal strength threshold may be set to 17.5db, or the two preset signal strength thresholds may be appropriately increased, for example, the second preset signal strength threshold may also be set to 19 db; it should be noted that the second preset signal strength threshold should be greater than the first preset signal strength threshold, so that the current tv signal strength reaches a stable state and then the related technical link of automatically switching to the proper resolution according to the current tv signal strength level in the subsequent step S40 is performed to ensure the accuracy of the final operation, and the problem of frequently switching to different resolutions does not occur when the current tv signal strength is at the critical value.
When the extreme weather such as overcast days or raining, snowing and the like is met, if the signal intensity of the second television signal (of the high-order layer) is detected to be less than 17db, the signal intensity of the current television signal is indicated to be a weak signal, namely the television signal received by the digital television receiver is changed from the original signal normal state to a weak signal state, and the step S40 is executed; of course, if it is detected that the signal strength of the (higher-level) second television signal is not less than 17db, that is, always greater than the first preset signal strength threshold or greater than the second preset signal strength threshold, the playing is performed according to the normal digital television program, and the step S40 is not necessarily executed.
S40: and extracting a first video resolution level corresponding to the first signal intensity level from a first television signal according to the first signal intensity level, and acquiring a resolution video corresponding to the first video resolution level according to the first video resolution level to realize digital television playing.
It is understood that the video resolution levels can be divided into a first video resolution level and a second video resolution level, in this embodiment, the first video resolution level is characterized as a low definition video, and the second video resolution level is characterized as a high definition video. And extracting a low-definition video (namely a first video resolution level) corresponding to the weak signal from the current television signal according to the condition that the (detected) current signal strength is a first signal strength level (namely the weak signal), and playing the current program according to the low-definition video.
It should be noted that the current television signal in step S10 may be understood as a television program Transport Stream (TS Stream), which is a code Stream of the MPEG-2 standard, where the TS Stream is composed of one or more programs, and each program is composed of one or more original streams and some other streams, including a video Stream, an audio Stream, a program specific information Stream (PSI), and other data packets. Among them, the PSI table has 4 types: a Program Association Table (PAT), a Program Map Table (PMT), a Network Information Table (NIT) and a Conditional Access Table (CAT); in the embodiment, the Program Association Table (PAT), the Program Map Table (PMT), the Network Information Table (NIT), and the Conditional Access Table (CAT) are all in a lower hierarchy (i.e., a first transmission hierarchy).
In the specific implementation, in the current television signal transmitted by the wireless transmitting end of the digital television, the high-definition video in the second television signal is normal video data, while the low-definition video data in the first television signal is obtained by adding a layered transmission descriptor in the PMT, and when the digital television receiving end detects that the layered transmission descriptor exists in the PMT, the digital television receiving end finds the resolution corresponding to the proper video resolution level (low-definition or high-definition) according to the layered transmission descriptor to realize the digital television playing.
In this embodiment, the digital television wireless transmitting end sets a layered transmission descriptor layer _ transmit _ descriptor in the PMT for some television channels in advance, and the structure design is as follows:
the meaning of the above code is:
descriptor _ tag: an identifier representing the hierarchical transport descriptor, fixed as 0xC 0;
descriptor _ length: represents the length of the descriptor;
layer _ type: the video playing method comprises the steps of representing the hierarchy of a current video (including audio) to be played, and representing that the video to be played is positioned in a low hierarchy when layer _ type is set to be 0; when layer _ type is set to 1, it indicates that the video to be played is in a high hierarchy level.
reserved _ future _ use: indicating a reserved bit.
reference _ PID: and a PID (packet identifier) representing another hierarchical video corresponding to the current video to be played. If layer _ type is 0 (low level), reference _ PID is PID of corresponding audio/video of high level; if layer _ type is 1 (high hierarchy), reference _ PID is PID of corresponding audio and video of low hierarchy.
Under the condition of bad weather, when a television signal received by a digital television receiver is changed from an original signal normal state to a weak signal state (the weak signal corresponds to the first signal intensity level), the digital television receiver detects whether a PID of a video currently played (located in a lower layer) in a PMT of a current television signal (namely, a current TS stream) corresponds to the above hierarchical transmission descriptor, and then layer _ type in the hierarchical transmission descriptor is 1 (a higher layer) through detection, namely, the hierarchical transmission descriptor is characterized in that the current television signal is changed from a normal signal intensity to a weak signal; correspondingly, since the layer _ type is 1, the reference _ PID is a PID of a low-definition video (i.e., a first video resolution level) corresponding to the low-price layer, and finally, the current video to be played is switched to the low-definition video corresponding to the reference _ PID, so that the satellite pan can still play the digital television program (of the low-definition video) under the condition that the television signal is weak due to severe weather.
The method comprises the steps that a current television signal transmitted by a digital television wireless transmitting end through a double-channel layer is received, wherein the current television signal comprises a first television signal in a first transmission layer and a second television signal in a second transmission layer, the bandwidth of the second transmission layer is larger than that of the first transmission layer, namely, a television signal with strong anti-jamming capability exists in the current television signal in severe weather by utilizing a hierarchical modulation principle of the digital television; then detecting the signal strength of the second television signal to determine the signal strength value of the second television signal; comparing the signal intensity value of the second television signal with a preset signal intensity threshold, and judging the signal intensity level of the current television signal to be a first signal intensity level when the signal intensity value of the second television signal is smaller than a first preset signal intensity threshold; and finally, extracting a first video resolution level corresponding to the first signal intensity level from a first television signal according to the first signal intensity level, and acquiring a resolution video corresponding to the first video resolution level according to the first video resolution level to realize digital television playing. In the embodiment, under the same program needing to be broadcast by the digital television, when the current television signal state is a weak signal state, the low-definition video is automatically switched to be suitable so as to realize the digital television broadcast, and further the problem that the satellite pan can not broadcast even if the television signal is weak in severe weather is solved.
Further, as shown in fig. 3, a second embodiment of the method for broadcasting digital tv according to the present invention is provided based on the first embodiment of the method according to the present invention, in this embodiment, after step S40, the method further includes:
s50: when the signal intensity value of the second television signal is detected to be larger than the second preset signal intensity threshold value, judging the signal intensity level of the second television signal to be a second signal intensity level;
it can be understood that, knowing that the second preset signal strength threshold is greater than the first preset signal strength threshold, the step of determining that the signal strength level of the second television signal is the second signal strength level is performed only when the signal strength value of the second television signal is detected to be greater than the second preset signal strength threshold, so as to avoid the problem that frequent switching between different resolutions may occur when the current television signal strength is at a critical value, so as to ensure the accuracy and effectiveness of the final operation.
S60: and selecting a second video resolution level corresponding to the second signal intensity level from the second television signals according to the second signal intensity level, and acquiring a resolution video corresponding to the second video resolution level according to the second video resolution level to continue playing the digital television.
It can be understood that after the current program is played according to the low-definition video, when it is detected that the signal intensity of the current television signal is greater than 17.5db (i.e. the second preset signal intensity threshold), it indicates that the signal intensity of the current television signal is a normal signal (the second signal intensity level), i.e. the television signal received by the digital television receiver is changed from a later weak signal state to a normal signal state, at this time, according to the fact that the current television signal is in the normal signal state, a high-definition video (the second video resolution level) corresponding to the normal signal is extracted from the current television signal, and the current program is continuously played according to the high-definition video, so that when the television signal intensity is restored to normal due to weather improvement, the low-definition video can be automatically switched to the high-definition video, and the user does not need to manually switch the video resolution level, great convenience is brought to the user, and the user experience is further improved.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, where a program for broadcasting a digital television is stored on the computer-readable storage medium, and when executed by a processor, the program for broadcasting a digital television implements the following operations:
receiving a current television signal transmitted by a digital television wireless transmitting end through a two-way layer, wherein the current television signal comprises a first television signal in a first transmission layer and a second television signal in a second transmission layer, and the bandwidth of the second transmission layer is greater than that of the first transmission layer;
detecting the signal strength of the second television signal to determine a signal strength value of the second television signal;
determining the signal intensity level of the current television signal according to the signal intensity value of the second television signal;
and extracting a video resolution level corresponding to the signal intensity level from the first television signal or the second television signal according to the signal intensity level, and acquiring a resolution video corresponding to the video resolution level according to the video resolution level to realize digital television playing.
Further, the program for broadcasting digital television when executed by the processor further realizes the following operations:
and comparing the signal intensity value of the second television signal with a preset signal intensity threshold value, and determining the signal intensity level of the current television signal according to the comparison result.
Further, the program for broadcasting digital television when executed by the processor further realizes the following operations:
and comparing the signal intensity value of the second television signal with a preset signal intensity threshold, and judging that the signal intensity level of the current television signal is a first signal intensity level when the signal intensity value of the second television signal is smaller than the first preset signal intensity threshold.
Accordingly, the program for broadcasting digital television when executed by the processor further realizes the following operations:
and extracting a first video resolution level corresponding to the first signal intensity level from a first television signal according to the first signal intensity level, and acquiring a resolution video corresponding to the first video resolution level according to the first video resolution level to realize digital television playing.
Further, the program for broadcasting digital television when executed by the processor further realizes the following operations:
when the signal intensity value of the second television signal is detected to be larger than the second preset signal intensity threshold value, judging the signal intensity level of the second television signal to be a second signal intensity level;
and selecting a second video resolution level corresponding to the second signal intensity level from the second television signals according to the second signal intensity level, and acquiring a resolution video corresponding to the second video resolution level according to the second video resolution level to continue playing the digital television.
The method comprises the steps that a current television signal transmitted by a digital television wireless transmitting end through a double-channel layer is received, wherein the current television signal comprises a first television signal in a first transmission layer and a second television signal in a second transmission layer, the bandwidth of the second transmission layer is larger than that of the first transmission layer, namely, a television signal with strong anti-jamming capability exists in the current television signal in severe weather by utilizing a hierarchical modulation principle of the digital television; then detecting the signal strength of the second television signal to determine the signal strength value of the second television signal; determining the signal intensity level of the current television signal according to the signal intensity value of the second television signal; and finally, extracting a video resolution level corresponding to the signal intensity level from the first television signal or the second television signal according to the signal intensity level so as to realize digital television playing. The embodiment can automatically switch to proper resolution according to the signal intensity level of the current television signal under the same program needing to be broadcast by the digital television, and further solves the problem that the television signal of the satellite pot is weak or even can not be broadcast under severe weather.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A method for broadcasting digital television, the method comprising:
receiving a current television signal transmitted by a digital television wireless transmitting end through a two-way hierarchy based on a digital television hierarchical modulation technology, wherein the current television signal comprises a first television signal in a first transmission hierarchy and a second television signal in a second transmission hierarchy, and the bandwidth of the second transmission hierarchy is greater than that of the first transmission hierarchy;
detecting the signal strength of the second television signal to determine a signal strength value of the second television signal;
determining the signal intensity level of the current television signal according to the signal intensity value of the second television signal;
and extracting a video resolution level corresponding to the signal intensity level from the first television signal or the second television signal according to the signal intensity level, and acquiring a resolution video corresponding to the video resolution level according to the video resolution level to realize digital television playing.
2. The method of claim 1, wherein said determining a signal strength level of said current television signal based on a signal strength value of said second television signal comprises:
and comparing the signal intensity value of the second television signal with a preset signal intensity threshold value, and determining the signal intensity level of the current television signal according to the comparison result.
3. The method of claim 2, wherein the first television signal comprises a first video resolution level, wherein the preset signal strength threshold comprises a first preset signal strength threshold and a second preset signal strength threshold, wherein the second preset signal strength threshold is greater than the first preset signal strength threshold;
correspondingly, the comparing the signal strength value of the second television signal with a preset signal strength threshold value, and determining the signal strength level of the current television signal according to the comparison result, further includes:
comparing the signal intensity value of the second television signal with a preset signal intensity threshold, and when the signal intensity value of the second television signal is smaller than the first preset signal intensity threshold, judging that the signal intensity level of the current television signal is a first signal intensity level;
correspondingly, the extracting, according to the signal strength level, a video resolution level corresponding to the signal strength level from the first television signal or the second television signal, and obtaining, according to the video resolution level, a resolution video corresponding to the video resolution level to implement digital television playing specifically include:
and extracting a first video resolution level corresponding to the first signal intensity level from a first television signal according to the first signal intensity level, and acquiring a resolution video corresponding to the first video resolution level according to the first video resolution level to realize digital television playing.
4. The method of claim 3, wherein the signal strength level further comprises a second signal strength level, the second signal strength level being greater than the first signal strength level;
the second television signal comprises a second video resolution level, and the resolution corresponding to the second video resolution level is greater than the resolution corresponding to the first video resolution level;
correspondingly, after the first video resolution level corresponding to the first signal strength level is selected from the first television signal according to the first signal strength level and the resolution video corresponding to the first video resolution level is obtained according to the first video resolution level to realize the digital television playing, the method further includes:
when the signal intensity value of the second television signal is detected to be larger than the second preset signal intensity threshold value, judging the signal intensity level of the second television signal to be a second signal intensity level;
and selecting a second video resolution level corresponding to the second signal intensity level from the second television signals according to the second signal intensity level, and acquiring a resolution video corresponding to the second video resolution level according to the second video resolution level to continue playing the digital television.
5. A method according to any one of claims 1 to 4, wherein the first television signal in the first transmission stage is transmitted by quadrature phase shift keying modulation.
6. An apparatus for broadcasting digital television, the apparatus comprising: memory, a processor and a broadcast digital television program stored on the memory and executable on the processor, the broadcast digital television program being configured to implement the steps of the method of broadcasting digital television according to any of claims 1 to 5.
7. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a broadcast digital television program which, when executed by a processor, implements the steps of the method of broadcasting digital television of any of claims 1 to 5.
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| CN1784878A (en) * | 2003-05-05 | 2006-06-07 | 汤姆森许可公司 | Apparatus and method for decoding in a hierarchical modulation system |
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