33results about How to "Eliminate signal distortion" patented technology

The invention discloses a sound signal processing method and device and equipment. The sound signal processing method comprises the steps that in the last signal processing cycle, an emitted signal spectrum of a target sound signal emitted by a loudspeaker and a received signal spectrum of the target sound signal received by a microphone are obtained; according to the emitted signal spectrum and the received signal spectrum, whether a distorted signal distortion frequency band appears in the target sound signal or not is detected; and when the signal distortion frequency band is detected, in the current signal processing cycle, the target sound signal is compressed according to the signal distortion frequency band, and the compressed target sound signal is emitted by the loudspeaker.

The invention relates to an ethernet tranceiving device on the basis of a coaxial cable network and a method for transmitting the Ethernet, the receiving device is used in an ethernet access point and each coaxial terminal and comprises a an analog interface which is connected with the coaxial cable, a received signal detecting module which is connected with the analog interface and used to detect electric level amplitudes for the received signals form the analog interface and a receiving automatic amplifying module which is connected with the received signal detecting module and self-adaptively adjusts magnification factors according to results for detecting the electric level amplitudes by the received signal detecting module, which enables the received signals after amplification to reach the same output electric level. The invention realizes the intercommunications between the access point of the ethernet and each coaxial terminal and between each coaxial terminal, thereby a CSMA / CD MAC layer of the ethernet can be used in applied environment of wide electric coaxial cable network, and the realizing cost is low.

The invention relates to an ethernet tranceiving device on the basis of a coaxial cable network and a method for transmitting the Ethernet, the receiving device comprises an analog interface (110) which is connected with a coaxial cable, a voltage amplification unit (260) which is connected with the analog interface (110) and used to amplify sent signal electric levels of the analog interface (110), a receiving unit (200) which is connected with the analog interface (110), wherein the receiving unit (200) comprises a receiving and amplifying unit (210) which is used to amplify received signalelectric levels form the analog interface (110), wherein the magnification factors of the voltage amplification unit (260) and the receiving and amplifying unit (210) are confirmed by attenuation characteristics parameters of a coaxial cable distributing network. The method for transmitting comprises: amplifying service signals before sending services and amplifying the service signals on the direction of receiving the services. The invention can realize that baseband electrical signals of the ethernet are transmitted in a coaxial distributing network and the cost is low.

The invention provides a method and system for reducing light source LED nonlinearity in a visible light communication system. According to the method and the system, signal distortion resulting from the nonlinearity characteristic of the LEDs can be eliminated from the sent signals themselves. The method comprises following steps of obtaining to-be-sent signal sequences; processing the signal sequences based on a selective mapping algorithm, thus obtaining a set of multi-carrier signal sequence with the minimum peak-to-average power ratio; converting the multi-carrier signal sequence into serial signals; generating a set of marking sequence with same length to the serial signals; if the amplitude value of the serial signals is more than an LED saturation threshold value, multiplying a pre-distortion compression coefficient by the multi-carrier signals of which amplitude value is more than the LED saturation threshold value; and assigning 1 at corresponding position in the marking sequence. The method and the system are applicable to the technical field of visible light wireless communication.

The invention discloses a parallel access memory system based on optical interconnection and mainly solves that problems that according to an existing electric bus memory system, the access bandwidth is small, access delay is large, area occupation is large, and board-level circuit data rate is low. The system comprises an optical transmitting layer (101) and memory layers (103). The optical transmitting layer is provided with optical emitters, optical receivers, U-shaped waveguides and broadband micro rings. The optical emitters and the optical receivers are located in the middle of the optical transmitting layer in two rows, and the U-shaped waveguides are arrayed around a reference position. Each memory layer is provided with memory units (104) distributed and arrayed in a grid type, and the memory units in a same rank are perpendicularly distributed on different memory layers. The parallel access performance of the memory system is improved, the data access bandwidth and the data rate are increased, the access delay is reduced, the area occupation of the memory system on a circuit board is reduced, and the memory system can be adaptive to optical communication between a processor core and the memory system.