40results about How to "Avoid nonlinear distortion" patented technology

A method for registering patterns on a web to provide independent scale control in both the lateral and longitudinal directions is provided. The method includes routing the web over a first roller; routing the web over a second roller and stabilizing the web; applying a pattern to the web using process hardware; measuring registration of the pattern and providing an error signal; controlling lateral position error using the error signal; controlling longitudinal position error using the error signal; controlling lateral scale error using the error signal; and controlling longitudinal scale error using the error signal. The method provides independent scale control in both the lateral and longitudinal directions. Independent scale control avoids non-linear distortions otherwise imposed by attempting to accomplish both corrections by stretching the web in both directions.

A method for registering patterns on a web to provide independent scale control in both the lateral and longitudinal directions is provided. The method includes routing the web over a first roller; routing the web over a second roller and stabilizing the web; applying a pattern to the web using process hardware; measuring registration of the pattern and providing an error signal; controlling lateral position error using the error signal; controlling longitudinal position error using the error signal; controlling lateral scale error using the error signal; and controlling longitudinal scale error using the error signal. The method provides independent scale control in both the lateral and longitudinal directions. Independent scale control avoids non-linear distortions otherwise imposed by attempting to accomplish both corrections by stretching the web in both directions.

A device for receiving a RF signal (1; 21) with loop-through output (16) is provided. The device comprises: an input (3) receiving a RF input signal (2); an analog- digital converter (8) converting the RF input signal (2) to a digital signal (9); a digital signal processing unit (10) digitally processing the digital signal (9); a digital-analog converter (14) converting the processed digital signal (13) to a loop-through RF signal (15) corresponding to the RF input signal (2); and a loop-through output (16) outputting the loop-through RF signal (15).

During digital transmission using existing non-linear AM emitters, spurious emissions occur as a result of the non-linear distortions, in turn causing inner band disturbances and also disturbing adjacent channels, as out-of-band radiation. Non-linear distortions are especially critical for digital multiple carrier signals (e.g. OFDM) which are recommended by the ITU with the DRM system for the AM area. In order to avoid the non-linear distortions, the end step of the AM emitter is operated in the linear mode, thus ensuring the ITU spectrum mask. The relatively low efficiency of the emitter during the linear operation can be improved by tracking the distribution voltage of the emitter end step according to the drive. To this end, the envelope of the complex modulated data signal is scanned, and said signal controls the distribution voltage for the emitter end step by means of the modulator operating as a switched-mode power supply unit.

An embodiment of the invention provides a data receiving terminal in a network data transmission system. The network data transmission system further comprises a front data transmission terminal, a transmission network and an access network. The front data transmission terminal comprises a convergence switch, a transceiving port of the convergence switch is forcedly set to transmit only, and the front data transmission terminal is used for encoding and IP (internet protocol) packing of audio-video data and the like and outputting an IP data packet in an IP broadcasting or multicast mode via the convergence switch. The transmission network is a cable television broadcasting network which is used for unidirectional and transparent transmission of the IP packet at the speed of 1Gb or above. The access network comprises a first switch and is used for obtaining the IP data packet from the transmission network via the first switch which is a broadcasting switch or a multicast switch. The data receiving terminal is used for obtaining the IP data packet from the access network and unpacking and decoding the IP data packet so as to play the audio-video data.

The invention discloses a fingerprint identification sensor and a fingerprint identification method, which include a fingerprint image sensing array for detecting finger touch, including a plurality of driving electrodes and sensing electrodes arranged in an appropriate manner, and a processor, which Cooperate with the sensing array, scan the sensing array and generate a complete fingerprint image based on the sensing signal, which generates different modulation signals and applies them to multiple driving electrodes to obtain a composite signal, and uses the modulation signal to Sensing signals of the sensing electrodes are demodulated to obtain electrical sensing signals indicating fingerprint information, and a complete fingerprint image is generated by processing the sensing signals. The invention effectively reduces the number of pins of the processor circuit chip package through the multiplexing of the electrodes, reduces the crosstalk and coupling between the sensing signals of the sensing electrodes, and optimizes the system design.

The invention discloses a power operation monitoring system for a 5G communication base station, which includes a power operation acquisition module, a control module and a wireless transmission module. The power operation acquisition module includes a power parameter acquisition circuit, an operational amplifier frequency selection circuit, a measurement protection circuit and a peak detection circuit , in the op amp frequency selection circuit, the op amp AR1 performs secondary amplification on the detection signal, effectively avoiding the nonlinear distortion caused by signal amplification, and at the same time adding a third-order bandpass filter for frequency selection, which eliminates the op amp process. The noise interference mixed in; the measurement protection circuit and the peak detection circuit are designed to measure the two key parameters of the frequency and amplitude of the detection signal respectively, so that the detection results are more stable and reliable, and the ARM microcontroller will collect the data through GPRS wireless transmission The module is sent to the monitoring server for monitoring and management, so as to realize remote monitoring of the power operation of the 5G communication base station, and has good reliability, fault diagnosis and system monitoring capabilities.