97 results about "Digital radio" patented technology

The invention discloses a signal integrity simulation analysis method for a digital radio frequency hybrid microsystem, and belongs to the field of advanced packaging of integrated circuits. According to the method, a complete analysis process accompanied with product research and development is established, systematic work of qualitative simulation evaluation, rule design and quantitative analysis verification is sequentially carried out in various stages of project approval demonstration, scheme design, design verification and the like of product design, and process conditions, material characteristics and rationality and feasibility of system layout are rapidly evaluated; qualitative support is provided for agile design of the scheme; designing rules and optimization ranges of structures such as a radio frequency link, a digital link and a coupling shield are formulated according to process and material rules, and accurate initial input is provided for comprehensive design of a product; according to the layout wiring form, digital, radio frequency and coupling areas are formed through division, time domain analysis, frequency domain analysis and near field analysis are carried out in a targeted mode, quantitative reference is provided for judging design reasonability, and an effective basis is provided for optimizing design content.

A PAPR optimization method for digital FM radio transmission is disclosed. The method includes generating an Orthogonal Frequency-Division Multiplexed (OFDM) signal for transmission and applying an adaptive PAPR reduction algorithm to the generated signal. The method further includes determining a Modulation Error Ratio (MER) for one or more frequency sidebands and iteratively adjusting PAPR reduction parameters based on the measured MER values. The adjustment includes optimizing the number of PAPR reduction iterations for a highest-power primary digital sideband, optimizing QAM constellation constraint limits, and adjusting convergence bias weight settings for a lowest-power primary digital sideband and / or secondary digital sidebands to maintain target MER values. The method further includes updating PAPR reduction parameters in real-time until the measured MER values meet predefined target thresholds and executing instructions to coordinate the operation of an optimization servomechanism, ensuring dynamic PAPR optimization across multiple transmission modes.

The invention provides a gain control method, a storage medium and a radio frequency generator, and the method is applied to the technical field of radio frequency, and comprises the steps: determining a target analog gain control parameter and a target digital gain control parameter according to a target power proportion in a radio frequency output instruction when the radio frequency output instruction is received; and performing digital domain gain modulation based on the target digital gain control parameter and a radio frequency signal parameter in the radio frequency output instruction to obtain a digital radio frequency waveform, converting the digital radio frequency waveform into an analog radio frequency waveform, and performing analog domain gain modulation on the analog radio frequency waveform based on the target analog gain control parameter to obtain a target radio frequency signal.

Digital radio signals and apparatuses for providing or receiving such signals are described. A digital radio signal has one or more of a link type indicator, indicating the source of image content. A further digital radio signal has compressed SVG data. A further digital radio signal has an indicator indicating a presentation style for text information. A further digital radio signal has an indication of a target group for an information object. A further digital radio signal has signature data. A further digital radio signal has a predetermined start object identifier.

1. The name of the design product: radio (wide screen digital radio). 2. The use of the design product: the design product is used for receiving broadcast, playing audio. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

FIG. 1 illustrates an apparatus for decoding according to an embodiment. The apparatus comprises an interface for receiving a plurality of ATSC Link-layer Protocol packets each of which comprising a packet header and a packet payload encapsulating digital content. Moreover, the apparatus comprises a decoding unit. In a first embodiment, the digital content being encapsulated within the packet payload of each of one or more ATSC Link-layer Protocol packets of the plurality of ATSC Link-layer Protocol packets comprises digital radio content, and / or a Distribution and Communications Protocol packet or a portion thereof, and / or Unified Speech and Audio Coding content or extended High Efficiency Advanced Audio Coding content, and / or Journaline content. The decoding unit is configured to decode the packet payload of each one of at least one ATSC Link-layer Protocol packet of the one or more ATSC Link-layer Protocol packets to obtain the digital content of said one of the at least one ATSC Link-layer Protocol packet.

A digital broadcast receiver apparatus (1) receives a digital broadcast in an OFDM system. A physical channel of the digital broadcast has a partial reception band (Bp) which is a part of a reception band. The digital broadcast receiver apparatus (1) is provided with a plurality of demodulation units (30) and a synthesis unit (50) that synthesizes the plurality of demodulation units (30). In a first operation mode (m1), the plurality of demodulation units (30) process signals in the partial reception band (Bp) of the same physical channel, thereby outputting a plurality of demodulation signals (s1). The synthesis unit (50) performs a process for the partial reception band (Bp) on the basis of the plurality of demodulation signals (s1). In a second operation mode (m2), one demodulation unit (31) among the plurality of demodulation units (30) processes a signal in all the reception band (Bf) including the partial reception band (Bp), thereby outputting one demodulation signal (s2). The synthesis unit (50) performs a process for all the reception band (Bf) on the basis of the one demodulation signal (s2).

The invention discloses a digital radio frequency memory and a test method thereof, and belongs to the technical field of digital signal processing, the digital radio frequency memory is realized through an FPGA, the FPGA comprises an ADC conversion module, a storage module, an automatic gain amplification module and a DAC conversion module, and the test method comprises the following steps: receiving an analog signal input from the outside through the ADC conversion module, the analog signal is converted into a digital signal; writing the digital signal into a storage module, and performing data length conversion through the storage module; calculating an amplification coefficient of the digital signal by using an automatic gain amplification module, and amplifying the digital signal output by the ADC conversion module to the maximum power of the DAC conversion module by using the amplification coefficient; and the DAC conversion module converts the digital signal after gain amplification into an analog signal and outputs the analog signal, so as to intuitively judge whether the whole hardware link function of the digital radio frequency memory is normal or not according to the characteristics of the output analog signal.

A method of determining a time of arrival of a packet at a digital radio device is provided. The packet comprises a header portion and a payload portion. The method comprises the digital radio device receiving a radio signal and processing said radio signal to produce an incoming bit sequence, correlating a first section of the incoming bit sequence with a first correlation sequence corresponding to a first section of the packet to determine a first correlation result, correlating a second section of the incoming bit sequence with a second correlation sequence corresponding to a second section of the packet to determine a second correlation result, said second section including at least part of the payload portion, identifying correlation peaks in the first and second correlation results, and determining a time of arrival of the packet at the digital radio device based on said correlation peaks.

An integrated digital RF circuit system includes: a substrate, the substrate including a substrate integrated waveguide, the substrate integrated waveguide including a waveguide width, a first plurality of vias and a second plurality of vias; and a source circuit board including a waveguide channel, wherein: the waveguide channel is at least partially positioned between the first plurality of vias and the second plurality of vias; the waveguide channel defines a channel length and a channel width; the channel length is greater than the channel width; and the channel length is greater than the waveguide width.

The utility model provides a kind of railway shunting handheld device, it is related to railway shunting technical field, including external structure and internal structure, external structure includes host computer and antenna, host computer includes: screen and button;Internal structure includes: communication module and positioning module;Communication module is used to receive shunting signaling and transmit shunting group personnel and vehicle position to shunting center, including: DMR digital radio unit and 4G / 5G full-network unit, DMR digital radio unit uses 400MHz frequency band communication, 4G / 5G full-network unit uses 4G / 5G full-network communication;Positioning module uses single Beidou RTK high-precision positioning technology to position shunting group personnel and vehicle position.The utility model improves the problem of function fragmentation in prior art, improves the efficiency and safety of shunting operation.

The invention relates to the technical field of vehicle communication, and discloses a multi-link cooperative multi-transmitting selective-receiving communication device for a remanufactured off-highway wide-body dumper, which comprises a system module assembly, the system module assembly comprises a power management module, a high-precision positioning module, a multi-mode communication module, a data interface module and a main control processing module, the power supply management module adapts to power supply fluctuation of mining area vehicles, is internally provided with a capacitor filter and an overcurrent protection circuit, accurately supplies power to connected modules or high-power components, and prevents voltage fluctuation from influencing the performance of the device, and the high-precision positioning module is a GNSS and RTK module, adopts a north cloud technology Alita chip, and supports Beidou, GPS and GLONASS multi-constellation combined positioning. According to the invention, a special digital radio station and a 5G and V2X multimode communication module are provided, double receiving circuit redundancy is designed for the special digital radio station, a reliable triple link pool is constructed, and the risk of single link interruption is avoided from the hardware level.

The application discloses a frequency control array jamming signal implementation method for countering space-time adaptive processing of airborne MIMO radar, and belongs to the technical field of radar jammer design based on frequency control array. The application firstly obtains jamming signals by intercepting radar signals and storing and processing the jamming signals through digital radio frequency modulation based on the frequency control array jammer, and then loads a deceptive delay on the jamming signals; after different frequency offsets are added to different radiating antennas of the frequency control array jammer, the jamming signals are transmitted to the ground in the form of array antennas, and after being reflected by the ground, frequency control array scattering jamming signals are generated and received by the airborne radar; the airborne radar performs space-time adaptive processing on echo data to resist jamming signals. The frequency control array scattering jamming signals adopted by the application can change the rank of the clutter covariance matrix of the airborne radar by changing the frequency offset, thereby affecting the degree of freedom of the clutter; and the frequency offset can affect the notch of the STAP improvement factor of the airborne radar, thereby affecting the STAP anti-jamming performance of the radar.

The invention discloses a repeater system compatible with multiple frequency bands and multiple systems and a working mode switching method, and relates to the technical field of communication, and the repeater system comprises a digital access control main unit which is connected with a base station and is used for receiving and sending signals of different systems and different frequency bands, the digital access control main unit processes signals of different standards through the radio frequency circuit, configures channels based on the standards of the signals through the baseband processing unit, and adjusts system local oscillation parameters through the baseband processing unit so as to output the signals of different frequency bands; and the digital radio remote unit is connected with the antenna and switches different working modes through a radio frequency switch. Signal transmission is carried out through the repeater system. According to the invention, the technical problem that a repeater system in the prior art cannot be compatible with multi-band and multi-standard signals is solved.

This invention relates to the field of wireless sensing, and in particular to a digital radio frequency reconstruction circuit, module, and radar transceiver system for suppressing antenna leakage. The digital radio frequency reconstruction circuit consists of a polyphase filter, a phase interpolator, and a multi-stage attenuator. The polyphase filter orthogonally decomposes the leakage signal into multiple orthogonal signals. Then, the gating circuit in the phase interpolator performs weighted synthesis of two orthogonal signals based on the principle of orthogonal vector synthesis, and adjusts the weights of the two orthogonal signals with the help of multiple signal interpolation circuits, thereby achieving precise phase adjustment. Finally, through cascaded and matched multi-stage attenuators with different attenuation amplitudes, the phase-adjusted circuit undergoes fine amplitude adjustment, thus reconstructing a corrected signal that accurately matches the leakage signal. This invention solves the problems of insufficient correction accuracy and narrow operating frequency band of existing circuits for leakage signals under high-frequency conditions.

Aspects of this disclosure relate to determining a transmission mode and a spectrum mode of a Convergent Digital Radio signal. The Convergent Digital Radio signal can be filtered by a plurality of filters. Correlation coefficients can be generated from the filtered signals, in which each correlation coefficient corresponds to a particular transmission mode and at least one particular spectrum mode. The transmission mode and the spectrum mode can be selected based on the correlation coefficients.

The invention belongs to the technical field of wireless digital broadcast communication security, and relates to an Auracast broadcast privacy protection system supporting key distribution and access control, which comprises a channel establishment and authentication module for establishing an out-of-band security control channel; the precursor key issuing module is used for issuing a static session precursor key to the target receiving equipment and the broadcast source equipment through channel encryption; the session key generation module is used for deriving a slice session key in combination with the public synchronization factor and the precursor key; the data packaging and sending module is used for encrypting the audio by using the slice session key, assembling a data frame and sending the data frame; the local key synthesis module is used for extracting a synchronization factor and locally synthesizing a slice session key; the audio stream analysis and output module is used for decrypting the data and managing a key life cycle; and the secret key life cycle management module is used for monitoring the state through a channel and executing erasing. According to the invention, the problem of realizing low-delay dynamic encryption and instant permission revocation without relying on periodic key redistribution in wireless broadcasting is solved.

Presented are control systems for governing analog and digital radio services in motor vehicles, methods for making / using such systems, and vehicles equipped with such systems. A method of controlling a vehicle includes an in-vehicle radio tuner receiving selections of broadcast radio stations output by analog signals and / or streaming radio stations output by digital signals. A vehicle controller retrieves a memory-stored broadcast station service (BSS) map with a service contour containing available broadcast radio stations having sufficient signal strength within a designated area. The controller receives geopositional data indicative of the host vehicle's location, and accesses a remote database to retrieve an updated BSS map that corresponds to the vehicle's location. The controller then determines if the stored BSS map corresponds to the updated BSS map; if not, the radio tuner responsively displays an updated list of available stations revised to reflect available stations contained in the updated BSS map.

To provide a technique for more preferably transmitting or receiving an advanced digital broadcasting service.SOLUTION: A digital broadcast receiver includes a first receiving unit that receives a digital broadcasting broadcast wave in which a 2K broadcast program and an extended broadcast program transmitted by modulated waves of different layers of the same broadcast wave are transmitted by simultaneous broadcasting from a broadcasting station, and a second receiving unit that receives the broadcast wave of the digital broadcast. In the broadcast wave, a 2K broadcast service that transmits the 2K broadcast program is transmitted by a modulated wave in an upper layer of the broadcast wave, and a 2K broadcast service that transmits the extended broadcast program is transmitted by the modulated wave of the lower layer of the broadcast wave.SELECTED DRAWING: Figure 2A

The invention discloses a pre-processing system for eliminating interference in adjacent ranges of analog signals of HDR and CDR. The present embodiment provides a pre-processing system for cancelling interference within adjacent ranges of analog signals of HDR and CDR, which, in the process of receiving hybrid digital radio (HDR, Hybrid Digital Radio) and Content Digital Radio (CDR, Conditional Digital Radio), restores the Symmetric attribute, and in addition, uses the FM phase (Phase) characteristic of the signal to determine whether the signal is noisy, thereby eliminating interference within adjacent ranges of the analog signals of HDR and CDR. Therefore, interference in an adjacent range of analog signals can be eliminated through a single path under the condition that beam forming (more than two paths) is not used.

The invention belongs to the technical field of radar calibration, and particularly discloses a method for automatically adjusting the flatness of a radar power beacon machine, which comprises a receiving link, a digital radio frequency storage DRFM unit and a transmitting link, the digital radio frequency storage DRFM unit comprises an AD conversion chip, an FPGA chip and a DA conversion chip, the FPGA chip presets a flatness power coefficient table, and the DA conversion chip is connected with the receiving link. The flatness power coefficient table is a frequency-link combination two-dimensional power coefficient matrix; the AD conversion chip converts an analog signal transmitted by the receiving link into a digital signal; the FPGA chip traverses the flatness power coefficient table according to the frequency and link combination of the received digital signal, and outputs a corresponding digital power compensation value; and the DA conversion chip carries out 0.01 dB stepping adjustment on the signal amplitude according to the received digital power compensation value. According to the invention, flatness leveling of any bandwidth and any frequency is realized, and the problem of non-adjustable flatness in broadband, multi-fluctuation and dynamic link scenes is solved.

A method performed by at an importer-exporter of an in-band on-channel (IBOC) digital radio broadcasting system comprises: receiving, from a first audio client, first protocol data units (PDUs) (first PDUs) of encoded main audio and that include first sequence numbers that progress in a first order; sending the first PDUs for transmission over a logical channel of an IBOC waveform; receiving, from a second audio client, second PDUs of encoded non-main audio and that include second sequence numbers; aligning the second PDUs to the first PDUs by aligning the second sequence numbers to the first sequence numbers, to produce aligned second PDUs; and switching to sending the aligned second PDUs for transmission over the logical channel in place of the first PDUs such that the second sequence numbers of the aligned second PDUs after switching maintain the first order of the first sequence numbers as established prior to switching.

A radio broadcast receiver comprising: a memory; and a processor that is coupled to the memory, and, when executing a program stored in the memory, performs operations. The operations include: receiving analog quality information indicating a reception quality of an analog radio based on a broadcast radio including a digital radio and the analog radio; and determining switching of a radio source from one of the broadcast radio and an IP radio to the other of the broadcast radio and the IP radio based on the analog quality information indicating the reception quality of the analog radio.

The invention relates to the field of wireless sensing, in particular to a digital radio frequency reconstruction circuit and module for suppressing antenna leakage and a radar transceiving system. The digital radio frequency reconstruction circuit is composed of a multi-phase filter, a phase interpolator and a multi-stage attenuator. Wherein the multi-phase filter performs orthogonal decomposition on the leakage signal to obtain multiple paths of orthogonal signals; a gating circuit in the phase interpolator performs weighted synthesis on the two paths of orthogonal signals based on an orthogonal vector synthesis principle, and is matched with a plurality of signal interpolation circuits to adjust the weights of the two paths of orthogonal signals so as to realize accurate phase adjustment; and finally, performing fine amplitude adjustment on the circuit after phase adjustment through the cascaded and matched multi-stage attenuators with different attenuation amplitudes. And a correction signal accurately matched with the leakage signal is reconstructed. The problems that an existing circuit is insufficient in correction precision of leakage signals under the high-frequency working condition and narrow in working frequency band are solved.

To evaluate the audio quality of radio broadcasts and appropriately switch radio audio in a radio device, such as an in-vehicle radio device.SOLUTION: A radio device includes: a receiving unit that receives digital radio signals which are radio signals of digital radio broadcasts, analog radio signals which are radio signals of analog radio broadcasts, and IP radio signals which are radio signals of IP radio broadcasts, which are simultaneously broadcasted; an evaluation unit that evaluates the sound quality of the analog radio audio using the digital radio audio based on the digital radio signals and the analog radio audio based on the analog radio signals; and a switch unit that switches the audio output of the digital radio audio to either the analog radio audio or the IP radio audio based in the IP radio signals, on the basis of the sound quality evaluation.SELECTED DRAWING: Figure 1

A method of operating a digital radio transmitter device (10, 12) according to a predetermined communication protocol that defines a transmission timing tolerance (30) is disclosed. The method comprises transmitting a plurality of first periodic transmissions (31) according to the predetermined communication protocol, the first periodic transmissions having a first period (39) and an inherent timing uncertainty (40) that is less than the transmission timing tolerance (30); performing a plurality of second periodic actions (55, 64) having a second period (39, 72), wherein the first period (39) and the second period (39, 72) are equal to or integer multiples of each other; and adjusting the timing of one or more of the first periodic transmissions (31) by an amount that is greater than the inherent timing uncertainty (40) but less than or equal to a difference (42) between the inherent timing uncertainty (40) and the transmission timing tolerance (30) so as to temporarily change the first period (39) by an amount that is less than or equal to the transmission timing tolerance (30), thereby changing an offset amount (60, 74) between the first transmissions (31) and the second actions (55, 64).

The utility model discloses an automatic switching system of a television transmitter, and relates to the technical field of radio and television. The television transmitter automatic switching system comprises at least two transmitters, a system controller, a coaxial module, a decision module and an antenna feed tube, wherein the transmitter is respectively connected with the coaxial module and the decision module; the coaxial module is also connected with the decision module, the system controller and the antenna feed tube; the antenna feed tube is also connected with the decision module; the decision module is also connected with the system controller; and the system controller is used for sending the transmitter switching instruction to the coaxial module, so that the coaxial module switches the transmitter connected with the antenna feed tube based on the transmitter switching instruction. According to the embodiment of the utility model, automatic switching is realized according to the first signal of the terrestrial digital radio frequency signal, the limitation that the existing system can only respond to power failure for switching is effectively solved, the guarantee capability of a transmitter for safe broadcasting is improved, and the use experience of a user is improved.

A summing unit within telecommunications system includes: port to receive digital data stream from another device; and summer function. Digital data stream includes first and second digital data derived from first and second base station. First and second digital data comprises first and second digital values associated with respective time periods. Summing unit extracts first digital data from digital data stream. Summer function digitally sums first digital data with third digital data derived from third base station to generate summed digital data for conversion to radio frequency signals and transmission at antenna. Third digital data comprises third series of third digital values associated with respective time periods. Summer function digitally sums first digital data with third digital data by digitally summing (i) first digital value associated with respective time period and (ii) third digital value associated with respective time period to produce summed value for respective time period.

This invention relates to a method for arc detection and self-recovery in an accelerator. The accelerator includes a digital radio frequency low-level system, a power source, and a radio frequency resonant cavity. The method includes: acquiring the cavity pressure signal of the radio frequency resonant cavity using the digital radio frequency low-level system, and detecting whether an arc event has occurred based on the cavity pressure signal; when an arc event is detected, the digital radio frequency low-level system switches the current normal output signal to the power source to an automatic recovery signal for automatic recovery; after automatic recovery is completed, the digital radio frequency low-level system switches the output back to the current normal output signal to the power source. This solution can be applied to the digital radio frequency low-level system of an accelerator to realize arc detection and fault recovery, reducing the fault recovery time to the millisecond level, and improving the accelerator's operating efficiency and availability.

Digital radio transmitters and data transmission methods are provided. Chirp-based spread spectrum digital radio transmitters are configured to suppress or attenuate discontinuities in the chirp frequency profile by an interpolation or smoothing procedure. The interpolation significantly reduces out-of-band emissions and does not affect demodulation and decoding. In the case of LoRa communications, the transmitter of the invention has low constellation error and can communicate with conventional unmodified receivers. The procedure does not introduce unwanted phase shifts and can be used to control the phase of the signal, also inserting arbitrary phase shifts on consecutive segments of the chirp.