34 results about "Null field" patented technology

A method and system for multi-channel audio encoding and decoding with backward compatibility based on the null field information maximum entropy rule is disclosed. The technical solution can adopt any existing stereo channel encoding system to encode the multi-channels audio signal, so as to transmit the multi-channel audio signal at the low bit rate identical with that of the stereo audio signal. It is more important that the existing stereo channel reproducing system can reproduce the audio format which utilizing the encoding method.

A method for removing cultural noise from a measurement of the field generated by an electromagnetic source, such as a current bi-pole or a magnetic loop source, the method comprising: simultaneously measuring the electromagnetic signal at a field measurement position and a calibration position close to the field measurement position, but in a null field of the source; using the field measurement and the calibration measurement to compute a filter that estimates the component of the field measurement that is correlated with cultural noise; convolving the computed filter with the calibration measurement to yield the estimated cultural noise component, and subtracting that component from the field measurement.

The invention discloses an all-shearing type magneto-rheological damper. The all-shearing type magneto-rheological damper is characterized by comprising an outer cylinder, an inner cylinder and a ball screw pair, wherein the inner cylinder is coaxially arranged with the outer cylinder, shearing discs are fixed by the ball screw pair, the inner wall of the inner cylinder is provided with electromagnetic coils and sharing ring sets corresponding to the shearing discs one by one, magneto-rheological liquid is filled in a cavity of the inner cylinder, at least one electromagnetic coil is arranged between adjacent shearing rings fixed on the inner wall of the inner cylinder, and the shearing discs, the shearing rings and the inner cylinder form a closed flux loop. On the premise of keeping same external size and energy consumption of a magneto-rheological damper, null-field viscous damping of the magneto-rheological damper is reduced, controllable damping ratio range is enlarged, and the all-shearing type magneto-rheological damper is added with potential for application to a high-speed impact / vibration control system. Besides, service efficiency of the magneto-rheological liquid in the magneto-rheological damper is improved, and cost of the magneto-rheological damper is effectively reduced.

A generator including a first magnetic assembly and a second magnetic assembly wherein the first and second magnetic assemblies are arranged in parallel for the production of a magnetic field and a null magnetic field region, a rotor positioned between the first and second magnetic assemblies the rotor being coupled to a drive shaft extending through the first and second magnetic assemblies wherein a portion of the rotor is positioned in the null field region, a least one current transfer mechanism coupled to the rotor in the null field region and at least one current transfer mechanism coupled to the shaft, a drive mechanism attached to the shaft, whereby actuation of the drive mechanism causes rotation of the rotor in the magnetic field to produce a electric potential between the first and second current transfer mechanisms.

A method of multi user multiple input multiple output (MIMO) communication in a wireless local area network (WLAN) system; and a transmitting device therefore are discussed. The method according to an embodiment includes generating an Aggregate-Medium Access Control Protocol Data Unit (A-MPDU) including an A-MPDU subframe, the A-MPDU subframe including a Medium Access Control Protocol Data Unit (MPDU) delimiter field; and selecting a type of a guard interval. When the A-MPDU is generated for a plurality of receiving devices, the transmitting device selects a short guard interval only if all of the plurality of receiving devices support the short guard interval. The MPDU delimiter field includes a null field and an MPDU length field, the null field indicates a corresponding A-MPDU subframe is used to pad the A-MPDU, and the MPDU length field indicates a length of an MPDU. The null field is a 1-bit information field.

The invention discloses a digital image fuzzy intensification method for inosculating a plurality of fuzzy operators. The method is divided into four steps: step one, brightness-darkness grades are defined as four grades; step two, for a first grade image and a second grade image , a linear transit function is adopted to make conversion, for a third grade image and a fourth grade image, a nonlinear transit function is adopted to make conversion; step 3, on a fuzzy field, different brightness-darkness grades choose different fuzzy operators to make fuzzy image intensification: for the first grade image, a multinomial intensification operator is adopted to make fuzzy field intensification; for the second grade image, a logarithm type intensification operator is adopted to make fuzzy field intensification; for the third grade image and the fourth grade image, a sectional transit type intensification operator is adopted to make fuzzy field intensification; step 4, inverting back to null-field, fuzzy intensified null-field images are obtained and sent out. The invention can get a better visual efficiency whether the image is of insufficient exposure or over exposure.