6 results about "Sideband" patented technology

A wireless magnetic resonance imaging scanner has one or more local coils, a microwave antenna array, and a local oscillator, and an upconverter. The local oscillator signal from the local oscillator is transmitted from the microwave antenna array to illuminate the local coils. The local coils generate magnetic resonance signals at a first frequency and the magnetic resonance signals at the first frequency are upconverted in the upconverter to microwave frequencies. The local oscillator operates at a frequency within an unlicensed band, chosen such that desired sidebands for reception of the upconverted local coil magnetic resonance signals fall outside the unlicensed band.

The invention discloses a microwave photon radio frequency phase shifter based on spectrum processing and a phase shifting method thereof. The phase shifter comprises a laser source, an optical modulator, an optical fiber amplifier, a spectrum processing system, a photoelectric detector and an optical coupler. The optical amplification signal of the optical fiber amplifier is incident on the diffraction grating and is separated into a plurality of reflected light rays. Different spectral components in the plurality of reflected light rays are projected on different pixel points of each row, and the same spectral components are projected on different pixel points of each column. The laser processor modulates the amplitude and phase of the spectral component and forms a plurality of beat frequency light waves. Each optical coupler synthesizes an optical carrier wave and a first-order modulation sideband in a spectrum manner to generate an optical single sideband modulation signal. The optical single sideband modulation signal is subjected to beat frequency in a photoelectric detector to generate a radio frequency signal. The phase noise of the photon radio frequency phase shifter iseffectively restrained, the photon radio frequency phase shifting function is achieved, scanning at any angle can be achieved, flexibility is high, reconfiguration is achieved, and the phase shifter is suitable for large-scale phased array radar.

The invention provides a guided mode resonance filter. The guided mode resonance filter comprises homogeneous dielectric rods uniformly distributed in a single layer. The dielectric constant of each homogeneous dielectric rod is arranged to be n; and dielectric constant of media around the dielectric rods is arranged to be n<o>, wherein n>n<o>. The section radius of the dielectric rod is r. Separation distance between two dielectric rods is d. The uniformly distributed homogeneous dielectric rods are regarded as an equivalent waveguide. The operating wavelength of the guided mode resonance filter is decided by the guided mode resonance effect. The guided mode resonance filter has the advantages that the structure is simple and the design is flexible. The guided mode resonance filter has excellent performance parameters. The reflectivity rate of resonant wavelength is 100%, the bandwidth less than 3nm, the sideband reflectivity rate is less than 0.5%, and the resonant wavelength is tunable.

A client system presents, within an execution environment of an application, a third-party media stream distinct from the application, received from a remote host server via a network. The client system detects interaction events during presentation of the third-party media stream, and transmits descriptions of the detected interaction events to the remote host server. The application may be pre-cued prior to presentation, e.g., to minimize start-up time. In some implementations, a side-band message channel is established to facilitate communication between the client system and the remote host server.