15 results about "Digital terrestrial television" patented technology

The invention discloses a UHF signal dynamic pre-correction method and system for a terrestrial digital television, and relates to the field of signal pre-correction, and the method comprises the steps: collecting a detection signal sequence of a UHF frequency band in real time, and obtaining an actual output signal processed by a power amplifier; separating the actual output signal into a detection signal component and a television data signal component; distortion feature extraction is carried out, and a nonlinear distortion parameter matrix is obtained through calculation; inputting the nonlinear distortion parameter matrix into the model as an input feature for learning training based on time domain-frequency domain dual paths of the double-circulation convolutional neural network, and obtaining a pre-distortion function; a television data signal is input into a pre-distortion function, a pre-correction signal is output, and the pre-correction intensity is dynamically adjusted through a closed-loop control mechanism. The method has the advantages that through the deep learning technology, signal components are accurately separated, distortion features are extracted, the pre-correction intensity is dynamically adjusted, and the transmission quality and stability of terrestrial digital television signals are remarkably improved.

The utility model relates to signal processing technical field, and disclose a kind of ground digital television signal receiver, including shell assembly and signal processing component, the signal processing component includes PCB board, external antenna interface, charging interface and OTG-Type-C interface;The surface of one end of the PCB board is respectively encapsulated with external antenna interface and charging interface;The surface of the other end of the PCB board is encapsulated with OTG-Type-C interface;The signal processing component is installed in the inside of the shell assembly, and the one end opening portion of the shell assembly is connected with cover plate.The utility model passes through the whole process cooperation of "radio frequency receiving pretreatment→DVB-T2, DVB-T, ISDB-T, SBTVD-T, ATSC1.0, ATSC3.0 demodulation decoding→USB interface adaptation→terminal APP processing", realizes following core value: solve the original defect that mobile terminal cannot receive ground digital television signal;Adopt the cooperative architecture of "hardware demodulation+USB protocol adaptation+APP software processing", without hardware modification to mobile terminal, reduce application threshold.

To enable more appropriate processing of control information.SOLUTION: A conversion unit that converts first control information transmitted in a physical layer defined in a first broadcasting scheme that is a broadcasting scheme of terrestrial digital television broadcasting into second control information to be transmitted in an upper layer that is an upper layer of the physical layer defined in a second broadcasting scheme that is a broadcasting scheme of digital cable television broadcasting, in which the second broadcasting scheme employs an IP scheme, and the second control information is included in signaling information related to transmission control and is transmitted by a TLV packet, the signaling information being used in the second broadcasting scheme. The present disclosure is applicable to, for example, a retransmission device for retransmitting terrestrial digital television broadcasting.SELECTED DRAWING: Figure 3

To more surely recognize simultaneous broadcasting.SOLUTION: There is provided a transmission device including a transmission unit configured to transmit a broadcast stream including signaling information regarding a broadcast component configuring content, in which the signaling information includes a descriptor in which a service identifier or location information for identifying a service corresponding to simultaneous broadcast content among one or more services included in a transmission stream for transmitting the simultaneous broadcast content corresponding to the content is arranged, and the descriptor is included in broadcaster information regarding information of a broadcaster. The present disclosure can be applied to, for example, a transmission system corresponding to a broadcasting scheme of terrestrial digital television broadcasting.SELECTED DRAWING: Figure 4

There is provided a transmission device, a transmission method, a reception device, and a reception method that enable more appropriate transmission of time information. The transmission device includes: a generation unit that generates physical layer control information included in a physical layer frame; and a transmission unit that transmits the physical layer frame as a broadcast signal to which a layered division multiplexing system is applied, in which a broadcast signal of a first broadcast system is transmitted in a first hierarchical layer of the layered division multiplexing system, and a broadcast signal of a second broadcast system is transmitted in a second hierarchical layer of the layered division multiplexing system, and, of the physical layer control information, first physical layer control information included in the broadcast signal of the first broadcast system includes time information to be used in a synchronization process related to the broadcast signal of the second broadcast system. The present disclosure can be applied to a transmission system compatible with a broadcast system of digital terrestrial television broadcasting, for example.

To more appropriately process time information.SOLUTION: There is provided a retransmission device including a conversion unit configured to convert first time information transmitted in a physical layer defined in a first broadcasting scheme into second time information in an NTP format stored in a packet transmitted in an upper layer that is an upper layer of the physical layer defined in a second broadcasting scheme different from the first broadcasting scheme, in which the first time information includes specific information regarding time, and the conversion unit converts the first time information into the second time information including the specific information and a predetermined fixed value. The present disclosure is applicable to, for example, a retransmission device for retransmitting terrestrial digital television broadcasting.SELECTED DRAWING: Figure 3

This application relates to a channel switching method for mobile communication multimedia broadcasting and terrestrial digital television broadcasting. The method includes: inserting multiple program stream time tags into the target digital television broadcasting program stream to obtain two identical target program streams; inputting the target program streams to a target broadcasting channel and a mobile internet channel respectively, and performing program stream time tag detection to obtain first and second program stream time tag detection results; and based on the first and second program stream time tag detection results, performing buffer control on the target digital television broadcasting program streams to achieve real-time seamless switching of the target digital television broadcasting program between the mobile network digital television broadcasting platform and the terrestrial digital television broadcasting system. This solves the problems of incompatibility and lack of seamless integration between traditional broadcast television services and online audiovisual services, resulting in poor user experience.

The application discloses a filter device for a ground digital television transmitter 2+1 system backup machine, which mainly comprises a switch controller, four coaxial switches, a channel 1 filter, a channel 2 filter and four loads; when the backup machine uses the channel 1 to transmit, the switch controller switches the filter device to the channel 1 filter working mode; when the backup machine uses the channel 2 to transmit, the switch controller switches the filter device to the channel 2 filter working mode; when the backup machine does not need to transmit the filter, the switch controller switches the filter device to the straight-through working mode. The application can solve the problem that the existing ground digital television transmitter 2+1 system backup machine cannot be equipped with an independent filter, so that the backup machine can realize the filter output under two channels, greatly improves the spectrum quality of the transmitter output signal and improves the ground digital television program watching effect.

The application discloses a UHF signal dynamic pre-correction method and system for ground digital television, relates to the field of signal pre-correction, and comprises the following steps: collecting a detection signal sequence of a UHF frequency band in real time, and obtaining an actual output signal processed by a power amplifier; separating the actual output signal into a detection signal component and a television data signal component; performing distortion feature extraction, and calculating and obtaining a nonlinear distortion parameter matrix; inputting the nonlinear distortion parameter matrix into a model as input features for learning and training based on a time domain-frequency domain double channel of a double-loop convolutional neural network, and obtaining a pre-distortion function; inputting the television data signal into the pre-distortion function, and outputting a pre-correction signal; and dynamically adjusting the pre-correction strength through a closed-loop control mechanism. The application has the advantages that: through deep learning technology, signal components are accurately separated, distortion features are extracted, and the pre-correction strength is dynamically adjusted, so that the transmission quality and stability of the ground digital television signal are significantly improved.

The application discloses a reconstruction method, in particular to a ground digital television multimedia broadcast reference signal high-quality reconstruction method, which comprises the following steps: step 1, high-precision synchronization and parameter tracking; step 2, robust channel estimation and equalization; step 3, soft information demapping and iterative decoding; step 4, bit stream re-modulation. The two-stage synchronization mechanism combining coarse synchronization and fine synchronization, combined with the improved windowing peak detection algorithm and dynamic threshold, can effectively resist noise and multipath interference, and significantly reduce the false alarm and missed detection probability. The joint tracking loop continuously compensates the carrier frequency deviation and the sampling clock deviation, effectively suppresses the phase noise and the inter-subcarrier interference, and ensures stable timing and carrier synchronization under high-speed movement and severe channel conditions.

The invention discloses an EPG processing method of a dual-mode set top box, the dual-mode set top box and a system, and the EPG processing method of the dual-mode set top box is applied to the dual-mode set top box and comprises the steps: obtaining a first electronic program list of a satellite television through the Internet; searching a second electronic program list of the local terrestrial digital television, and uploading the first electronic program list and the second electronic program list to the preset server; and receiving a target electronic program list sent by the preset server, wherein the target electronic program list is obtained after the preset server carries out comparison and re-operation on the first electronic program list and the second electronic program list. According to the technical scheme provided by the invention, automatic pulling, comparison, synthesis and issuing of the EPG are realized, manual operation and channel redundancy can be eliminated, and the method is particularly suitable for a Zhongsa-9 dual-mode enhanced set top box.

The utility model relates to the field of information detection, and provides FPGA-based portable signal detection equipment, which comprises a shell, an integrated conformal antenna, a signal demodulation module, an FPGA module, a communication module, a storage module, a power supply module, a touch display screen module and an audio output module. The device can receive and demodulate various types of broadcast and communication signals, such as FM / AM broadcast signals, DTMB terrestrial digital television signals and CMMB mobile multimedia broadcast signals, and comprehensively detect and process a physical layer, a code stream layer and an audio and video layer through the FPGA module. And meanwhile, the equipment has the function of transmitting detection data and alarm information back to a monitoring center, so that efficient signal detection and management are realized, and the accuracy and convenience of signal detection are improved.

To more flexibly operate a broadcast service.SOLUTION: There is provided a transmission device including a generation unit configured to generate additional information including at least one of a plurality of types of control information or data, and a transmission unit configured to transmit a physical layer frame including the additional information and transport multiplexing control information as a broadcast signal, in which the additional information is included in a signal to be transmitted on a predetermined channel defined in a next-generation system of ISDB-T and is transmitted on the basis of a band use system defined in the transport multiplexing control information. The present disclosure can be applied to, for example, a transmission system corresponding to a broadcasting scheme of terrestrial digital television broadcasting.SELECTED DRAWING: Figure 7

The invention provides video playing equipment and a video playing method, and relates to the technical field of terrestrial digital televisions, and the video playing equipment comprises a DTMB signal obtaining module, a media signal obtaining module and a signal output module which are electrically connected with a main control module; the DTMB signal acquisition module is used for acquiring a DTMB signal, amplifying the DTMB signal and sending the DTMB signal to the main control module; the main control module is used for sending the amplified DTMB signal to the signal output module if the signal intensity of the amplified DTMB signal is greater than a preset intensity threshold value; if not, sending a media signal acquisition request to a media signal acquisition module; the media signal acquisition module is used for sending a media signal to the main control module; the main control module is used for sending a media signal to the signal output module; and the signal output module is used for outputting media information according to the DTMB signal or the media signal. According to the invention, intelligent switching between a traditional DTMB signal and a network media signal is realized.

The invention discloses a three-mode integrated one-way television gateway chip and a signal processing method. The chip integrates an ARM Cortex-M series processor, a Beidou / GPS module, an all-standard demodulator and a TS hard processing engine through BGA packaging with the size smaller than or equal to 15 mm < 2 >. Adaptive demodulation (compatible with DVB-S2 / T2 / C2 and ABS-S / DTMB) of wired / satellite / terrestrial digital television signals input by a single radio frequency line is supported; a national cipher SM4 engine and an OTP security area are arranged in the mobile terminal, and GD / J 072-2020 network access authentication is met; meanwhile, the expansion interface supports the USB 3.0, the gigabit Ethernet and multiple paths of UART / I2C, the problems of multi-signal compatibility, high-security authentication and miniaturized integration are solved, and the problem that a traditional television gateway device cannot achieve multi-signal access, high-security descrambling and radio and television compliance is solved.