63results about "Dot-and-dash receiving apparatus" patented technology

A spectral notch modulation technique for encoding information in a signal involves transforming the signal into the frequency domain via a fast Fourier transform (FFT) of length N, such that the signal is represented by N frequency bins, selectively nulling M of the N frequency bins, where nulled combinations of M frequency bins respectively correspond to encoded information bits, transforming the selectively nulled signal to the time domain via an inverse FFT, and transmitting the selectively nulled signal. At the receiving end, the signal is demodulated to recover the encoded information by transforming the signal into the frequency domain via a fast Fourier transform (FFT) of length N, identifying the set of M nulled frequency bins among the N frequency bins, and converting the set of M nulled frequency bins to corresponding information bits.

Embodiments of the present invention provide a method, apparatus, and system of wireless transmission with frame alignment. For example, a method in accordance with demonstrative embodiments of the invention may include synchronizing between a transmitter using a first modulation scheme, which may have multiple frame formats, and a receiver using a second modulation scheme, by calculating a transmission time that aligns an inter frame space start time of the first and second modulation schemes. Other features are described and claimed.

Methods and apparatus are provided for securely printing a print job on a networked printer. An application program running on a networked computer instructs the printer to generate and exchange cryptographic keys. The application program then encrypts the print job using the keys, and then communicates the encrypted print job to the printer. The printer decrypts the received print job and prints the document.

A system and method for providing secure, on-demand delivery and retrieval of documents, messages and the like utilizing an adaptor coupled to a facsimile machine. An adaptor is coupled between a facsimile machine and a telephone line. A mobile device communicates with the adaptor to allow a user to log onto a document delivery system, via the telephone line, and select a document, message or the like to be printed. The telephone number of the facsimile machine is provided to the data center by the adaptor or mobile device, and the data center then sends the selected documents to the facsimile machine through the adaptor. Alternatively, the data center can encrypt the documents before sending, and a key is used by the adaptor to decrypt the documents prior to sending to the facsimile machine.

A system and method for sending a print job to a preselected recipient. The method includes encrypting a data stream received in a first peripheral device; and transmitting the encrypted data stream from the first peripheral device to a second peripheral device.

The invention relates to the technical field of communication signal processing equipment, in particular to a message copying and sending intelligent terminal based on Morse codes. A voice acquisitionunit is used for acquiring a Morse code audio signal. A computer main control unit is used for processing the Morse code audio signal and obtaining Morse code message information. A message output unit is used for outputting Morse code message information. A power supply unit is used for supplying power to the voice acquisition unit, the computer main control unit and the message output unit. Thecomputer main control unit is respectively in signal butt joint with the voice acquisition unit and the message output unit. According to the invention, the conversion from a manual copying mode to amachine automatic copying mode in short-wave communication can be realized. The labor intensity and the training difficulty of a telegraph operator are reduced. The telegraph operator can continuously work for 24 hours.

Content data (CD) and printer specifying information (PI) generated by encrypting a printer identifier to specify a printer capable of printing this content data (CD) are included in print job data to be transmitted from a content server (44) to a printer (36). The printer (36) which has received the print job data reads and decrypts the printer specifying information (PI) included in the print job data and judges whether the printer identifier included therein coincides with its own printer identifier or not. Only when both printer identifiers coincide, print of the print job data is executed. Hence, unjust copy print of content data can be prevented.

The invention relates to a mobile electronic device for transmitting and receiving a Morse code, which comprises an input module, an encoding module, a laser transmitter and a processing module. The input module, the encoding module, the processing module and the laser transmitter are connected in turn. The invention provides the mobile electronic device for transmitting and receiving the Morse code, through which a user can also communicate with faraway persons through the transmitting and receiving of the Morse mode under the condition that a mobile communication network cannot be in normal use.

The invention relates to the technical field of message identification of Morse signals in various communication systems. The invention discloses an intelligent detection and recognition method of Morse messages based on deep learning, and the method comprises the steps: carrying out the time-frequency analysis and clustering of a received Morse signal, calculating a judgment threshold, detectingthe energy of a signal through the judgment threshold, and recognizing the position of a Morse code word interval; and identifying the Morse code words corresponding to the Morse signals between the two intervals section by section by using a neural network. According to the invention, the problems that the current Morse message automatic recognition technology has poor recognition effects on manual shot Morse messages and is greatly affected by channel are solved, and the method has relatively high automatic identification speed and accuracy of the Morse code.

The invention provides a short wave Morse message automatic identification method based on intelligent image analysis. The method comprises the following steps: step 1, locally generating a code wordsample of a training Morse signal according to a code rate of the training Morse signal and a system sampling rate to form a training sample set; Step 2, generating a modified spectrogram of each sample signal in the training sample set; Step 3, taking the corrected spectrogram of each sample signal as the input of a convolutional neural network, and training the convolutional neural network by adopting a transfer learning method; Step 4, performing code word interception on the received target Morse signal to obtain all code word data of the target Morse signal, and generating a correction speech spectrogram of each code word data according to the step 2; And 5, identifying the modified spectrogram of each code word data of the target Morse signal by using the trained convolutional neuralnetwork, and outputting a code word corresponding to the modified spectrogram. According to the invention, the Morse signal message identification effect can be improved.

The invention relates to the technical field of radio, and provides a Morse code radio frequency signal receiving and identifying method and device and an analog radio station host, which are used forimproving the decoding accuracy. The method comprises the following steps: carrying out edge capture on a received 48KHz bit stream to find a rising edge and a falling edge of a corresponding Morse code message; timing each rising edge and each falling edge according to a preset 64S timer; caching the time of each rising edge and each falling edge; further establishing a cached high-low level duration time table; and calculating a dot code time length, a code division time length, a code interval, a character interval and a word interval time length according to the high-low level duration time table so as to determine a decoding time window, so that an ASCII code of a character corresponding to the 48KHz bit stream is inquired according to a preset Morse code ASCII code lookup table. According to the invention, the problem of low Morse code identification and decoding accuracy of the Morse code radio frequency signals received by the analog radio station host and sent manually is solved.

The invention discloses a network access method, device and system. The method comprises the following steps: receiving network access information of a target wireless network; generating corresponding coding information according to the network access information, wherein the coding information is used for indicating a to-be-executed action; and executing a to-be-executed action indicated in thecoding information, analyzing the network access information by the to-be-executed network access equipment according to the to-be-executed action, and accessing the target wireless network through the analyzed network access information. The technical problem that the safety performance of information in the network access process is low due to the fact that a communication mode adopted when theInternet of Things device conducts network access in the prior art is a wireless communication mode is solved.

The embodiment of the invention provides a voice updating method and apparatus for voice control of a home appliance, and belongs to the field of home appliances. The voice updating method comprises the following steps: obtaining a voice category available for a user from a server; displaying the voice category to the user for the selection of the user; and obtaining voice corresponding to the voice category from the server according to the voice category selected by the user for the voice control. By adoption of the voice updating method and apparatus, a variety of voices can be provided forvoice control without being limited by the storage space in the home appliance, thereby improving the user experience.

The invention discloses a Morse signal detection method based on a Kalman filtering algorithm. Signals are subjected to bit synchronization by means of a self-synchronization algorithm, an adaptive energy threshold is set for interference noise energy time varying by means of the Kalman filtering algorithm to conduct soft judgment on calculated actual energy values of the signals, and then the purified CW signals are recognized. According to the method, the CW signals can be effectively detected out synchronously under a strong noise background, the anti-interference capacity is high, the error rate is low, the adaptivity is high, and the real-time performance is better.

In one embodiment of the invention, a format for renewability content (e.g., a System Renewability Message (SRM)) corresponding to a content protection protocol (e.g., High-Bandwidth Digital Content Protection (HDCP)) may be interoperable with devices that are compliant with different versions of the standard (e.g., HDCP1.x and 2.x devices) and that include different amounts of storage for the renewability content (e.g., first and second generation devices).