95 results about "Broadcast band" patented technology

The invention relates to an apparatus 1 comprising a broadcast receiver circuit, an embedded antenna for receiving broadcast signals and a tuning circuit coupled between the antenna and the receiver circuit, which tuning circuit comprises a filter circuit coupled to ground, wherein the tuning circuit is designed to have a first resonance at a first frequency below a broadcast band of interest, and a second resonance at a second frequency above the broadcast band and wherein the tuning circuit comprises an amplifier with an output to the receiver circuit and with an input to the filter circuit, and wherein the tuning circuit is provided with a carrier to noise ratio (CNR) which is substantially fiat across the broadcast band.

A system and method for reducing interference between communications systems sharing at a portion of at least some allocated frequency bands is described. The system comprises a first communication system broadcasting on a first set of broadcast bands having guard bands therebetween, and a second communications system broadcasting on a second set of broadcast bands substantially spanning the guard bands of the first communications system.

A wireless transceiver comprising: a receiver adapted to receive signals in a television broadcast band; and a transmitter adapted to transmit signals in a different band. Also provided is a counterpart transceiver. The latter transceiver comprises: a transmitter adapted to transmit signals in a television broadcast band; and a receiver adapted to receive signals in the different band.

A method for an antenna architecture may comprise receiving at a first radio frequency integrated circuit (RFIC) integrated within a mobile terminal, first signals via at least a first antenna, where the first signals may comprise signals within a 2100 MHz band. Second signals may be received at a second RFIC integrated within the mobile terminal via at least one of the first antenna and at least one other antenna, where the second signals may comprise signals within at least one of an 1800 MHz band and a 900 MHz band. Third signals may be received at at least a third RFIC integrated within the mobile terminal via at least one of the first antenna and at least one other antenna, where the third signals may comprise VHF / UHF broadcast signals within at least one of a DVB broadcast band, an ATSC broadcast band and an ISDB broadcast band.

A Frequency Agile Electrically Small Tactical AM Broadcast Band Antenna System (NC#098978) comprising a transmitter, antenna, plurality of mast wires and configurable tophat assembly. The transmitter is designed to transmit radio frequency signals. The antenna tuning unit is operatively coupled to the transmitter and designed to tune the apparatus to a desired frequency. The plurality of mast wires operatively is coupled to the antenna tuning unit and designed to receive and output radio frequency signals. The configurable tophat assembly is operatively coupled to the plurality of mast wires. The configurable tophat assembly comprises a tophat disc comprising a conductive material, a plurality of tophat wires comprising a conductor material and a plurality of tophat jumpers designed to help configure said plurality of tophat wires to different lengths by providing electrical open and electrical short states.

A dual-port IBOC® antenna provides omnidirectional radiation of orthogonal, circularly polarized analog (FM) and digital (OFDM) signals using quadruple coplanar square loops driven from a hybrid having balanced outputs. The loops are arranged in a tiled square, with proximal sides functioning as further stripline hybrids to cancel cross coupling between the loops. Each loop quad is reflector-backed and emits a directional signal; multiple loop quads oriented radially form an omni bay. Vertical spacing between bays includes a minimum position for mutual coupling, while symmetry establishes uniform input impedance on the hybrid input ports. Tuning barbs on the loops fine tune frequency response. Bandwidth is wide, so that a single antenna can radiate multiple FM analog and hybrid IBOC® channels over the VHF FM radio broadcast band.

A dual-port IBOC® antenna provides omnidirectional radiation of orthogonal, circularly polarized analog (FM) and digital (OFDM) signals using quadruple coplanar square loops driven from a hybrid having balanced outputs. The loops are arranged in a tiled square, with proximal sides functioning as further stripline hybrids to cancel cross coupling between the loops. Each loop quad is reflector-backed and emits a directional signal; multiple loop quads oriented radially form an omni bay. Vertical spacing between bays includes a minimum position for mutual coupling, while symmetry establishes uniform input impedance on the hybrid input ports. Tuning barbs on the loops fine tune frequency response. Bandwidth is wide, so that a single antenna can radiate multiple FM analog and hybrid IBOC® channels over the VHF FM radio broadcast band.

A method and apparatus is disclosed for detecting the frequency to which a broadcast receiver is tuned. In one embodiment, a sensing unit emits a chirp signal over a range of broadcast bands and monitors the output of the radio receiver to detect the frequency to which the radio receiver is tuned. In another embodiment, a sensing unit demodulates radio signals across a range of frequencies and compares the demodulated signals to observed audio output of the radio receiver.

A method for an antenna architecture that handles World band cellular and broadcast channels may be provided. The method may comprise receiving at a first radio frequency integrated circuit (RFIC) integrated within a mobile terminal, first signals via a first antenna, where the first signals comprise signals within at least one of a 2100 MHz band and a 1900 MHz band. The method may further comprise receiving at a second RFIC integrated within the mobile terminal, second signals via the first antenna, where the second signals comprise signals within at least one of a 1900 MHz band, a 1800 MHz band, a 900 MHz band and a 850 MHz band. Additionally, third signals may be received via the first antenna at a third RFIC integrated within the mobile terminal, where the third signals comprise signals within a VHF / UHF broadcast band.

A method for an antenna architecture may comprise receiving at a first radio frequency integrated circuit (RFIC) integrated within a mobile terminal, first signals via at least a first antenna, where the first signals may comprise signals within a 2100 MHz band. Second signals may be received at a second RFIC integrated within the mobile terminal via at least one of the first antenna and at least one other antenna, where the second signals may comprise signals within at least one of an 1800 MHz band and a 900 MHz band. Third signals may be received at at least a third RFIC integrated within the mobile terminal via at least one of the first antenna and at least one other antenna, where the third signals may comprise VHF / UHF broadcast signals within at least one of a DVB broadcast band, an ATSC broadcast band and an ISDB broadcast band.

The invention provides an underground positioning and safety monitoring system on the basis of a communication network, which comprises a ground control center, a plurality of personnel positioning terminals, a plurality of short message positioning terminals, a plurality of voice communication positioning terminals, a plurality of wireless positioning base stations and a base station gateway. The personnel positioning terminals carry out timing on broadcast signals by broadcast bands; the base station gateway or the wireless base stations receive the broadcast signals, acquire contents and the signal strengths of the broadcast signals, encapsulate information according to a protocol, transmit the information to the ground control center by the network for positioning processing, and acquire corresponding position information; meanwhile, a mobile node adopts a timing POLL mechanism to receive a downlink command of a data center so as to realize bidirectional data transmission, and a network base station controls illumination equipment to realize energy-saving production according to existence or non-existence of the mobile node in a current region. The underground positioning and safety monitoring system has the characteristics of high reliability, simplicity in construction and accuracy in position.

A method of near-field electromagnetic ranging and location exploits the long-wavelength, near-field characteristics of low-frequency RF signals like those in the vicinity of the AM broadcast band. These signals are robust against scattering from small objects and only mildly perturbed by the urban landscape including building structures. They are thus amenable to an RF fingerprinting approach exploiting a coarse calibration to capture the behavior of the gradually varying signal characteristics. In embodiments, a method of near-field electromagnetic ranging and location may exploit transmit tags transmitting to an infrastructure of locator-receivers, or locator-receiver tags detecting signals from an infrastructure of fixed transmitter beacons. In still further embodiments, fixed transmitter beacons may be supplemented by uncooperative signals sources including signals-of-opportunity like AM broadcast band signals.

A first resonance is generated by the inductance of a first coil connected between a first antenna conductor in a window glass sheet and a receiver and the impedance of the antenna conductor, and a second resonance is generated by the inductance of a second coil connected between a second antenna conductor and an automobile body as the earth. The antenna conductor and the antenna conductor are in a capacitive coupling relation, whereby signals in different broadcast band: a low frequency band and a high frequency band, are well received.

A first resonance is generated by the inductance of a first coil connected between a first antenna conductor in a window glass sheet and a receiver and the impedance of the antenna conductor, and a second resonance is generated by the inductance of a second coil connected between a second antenna conductor 3b and an automobile body as the earth. The antenna conductor and the antenna conductor are in a capacitive coupling relation, whereby signals in different broadcast band: a low frequency band and a high frequency band, are well received.

A wireless remote unit is operable to demodulate signals received over a plurality of different bands, such as the FM broadcast band, and one or more higher frequency bands. The various bands have different channels and the selection of the band and the channel is accomplished by control signals received by the receiver. The control signal can carry menu information in one direction to the user and can carry user data, including the identity of the user, in the other direction. There can be multiple transmitters, wherein each transmitter sends information on a different channel within a band, and tunes remote units to a particular transmitter based upon proximity to that transmitter. The transmitter is capable of displaying visual data. The visual data includes a predetermined number of advertisements to be displayed during a user session, prompted either by a user logging onto the system, or by the system's detection of a user's presence.

A personal listening system uses the FM broadcast band for transmission and reception. The system includes a base unit and physically separate right- and left-ear listening units. The base unit includes an FM stereo transmitter. Each listening unit demodulates and amplifies the received signal, but the right-ear unit only amplifies the right channel and the left-ear unit only amplifies the left channel. The base unit may be a digital music player, book reader, video player, smart cellular telephone, or any other portable device. The base unit may include a display for displaying the selected FM frequency. The base unit may be a self-contained or integrated unit, or a device that couples to a digital music player, smart cellular telephone or other device to receive the audio signal therefrom. The right- and left-ear listening units may be any type of on-ear, in-ear or around-ear sound delivery devices including earbuds.

Aspects of a method and system for LNA adjustment to compensate for dynamic impedance matching are provided. In this regard, an antenna matching network may be configured to maximize received signal strength for a determined frequency and an amplifier gain may be adjusted based on the maximized signal strength such that output levels of the amplifier are between specified limits. The antenna matching network may be programmatically controlled via one or more switching elements. The amplifier gain may be programmatically controlled via one or more bias points. The antenna matching network may be configured for a plurality of frequencies in a frequency band, such as an FM broadcast band, and a configuration for each frequency may be stored. Accordingly, when the receiver is tuned to a frequency, a corresponding configuration may be retrieved from memory.

The present invention refers to a method for defining useable frequency bands for a powerline communication (PLC) system (101) using power supply lines of a power supply network (104a) for interconnecting a number of PLC nodes (302, 306) such that electromagnetic emissions generated by PLC signals (s(t)) transmitted via said power supply lines do not interfere with broadcast RF signals radiated in the same frequency bands. Before starting own communication activities, PLC nodes (302, 306) participating in a PLC session scan (S1a) the entire frequency range designated for powerline communication to detect (S1b) frequency bands which are occupied by broadcast services. During powerline communication the occurrence of broadcast signals is regularly checked (S2) by screening (S2a) the entire frequency range designated for powerline communication and detecting (S2b) relevant broadcast bands that should be omitted during powerline communication to avoid interference noise (n(t)). After that, new frequency bands for powerline communication are allocated (S3) within said frequency range, provided that these new bands are not occupied by any detected wireless service.

A method for an antenna architecture that handles European band cellular and broadcast channels may be provided. The method may comprise receiving at a first radio frequency integrated circuit (RFIC) integrated within a mobile terminal, first signals via a first antenna, where the first signals comprise signals within a 2100 MHz band. The method may further comprise receiving at a second RFIC integrated within the mobile terminal, second signals via the first antenna, where the second signals comprise signals within at least one of a 1800 MHz band and a 900 MHz band and receiving at a third RFIC integrated within the mobile terminal, third signals via the first antenna, where the third signals comprise signals within a VHF / UHF broadcast band.

The invention relates to a method and a system for receiving digital broadcasting signals in frequency modulation (FM) broadcast bands. The method comprises the following steps of: receiving digital / analog (D / A) mixed signals x (t); preliminarily separating to acquire preliminarily recovered analog FM signals x0FM (t) and digital FM signals d0 (t); performing first level pilot frequency-based iterative separation on the signals to acquire digital and analog FM signals after the first level iterative separation; and performing second level iterative separation by means of pilot frequency and internal codes, wherein the digital FM signals after the iterative separation acquire digital audio signals and data signals through channel decoding, and the analog FM signals acquire analog audio signals through demodulation and D / A conversion. A digital FM signal demodulation decoder of the system comprises a preliminary FM separator, an iterative FM separator, and a synchronization recovery and channel equalizer and a decoding module, and the iterative offset separation of the analog master FM from digital signals is realized. According to the method and the system, the mixed D / A signals overlapped by the same channel are separated, the mutual interference of the signals is eliminated, and the FM band digital broadcasting system can be realized.

Disclosed herein is a modulator module that uses a radio receiver to search the broadcast band for an unoccupied area (ie., unutilized spectrum) where a modulator can transmit without interference. Additionally, it automatically adjusts the modulator and car radio to the same frequency within one of the unoccupied areas to exploit the free spectrum. The system further provides a hands-free approach to using a modulator in a vehicle by automatically adjusting both the modulator and car radio to the same frequency without manual intervention from the user.

A low-power radio frequency (RF) transmitter includes circuitry for finding unused transmission frequencies on a frequency band, such as an FM broadcast band, and to use an available frequency to broadcast a low-power audio signal to a sound reproduction device. In one embodiment, the sound reproduction device forms part of an entertainment system such as a vehicular stereo, home stereo, boom box, or RF headset. In one embodiment, the transmitter is operatively part of a sound generation device capable of generating and / or reproducing music or sound, such as an MP3 player or other portable entertainment device, personal digital assistant, electronic musical instrument, electronic toy, wireless microphone, or the like. The sound generation device can use an RF receiver or a geoposition source to identify an available transmission frequency. Also described are a sound generation system, a computer-readable medium, and various methods, including methods for finding and using available transmission frequencies.

The invention discloses a composite modulation system compatible with medium-wave analogue amplitude modulation (AM) broadcast. According to the system, a low-sideband m-ary position phase keying (MPPSK) signal with modulated high-speed data is adopted to replace a sinusoidal carrier; carrier-retained double sideband amplitude modulation is performed with an analogue audio signal; after a receiver performs up-conversion and impacting filter on the received composite modulation signal and extracts a coherent carrier to multiply, an analogue audio signal is separated by using spectral distribution difference, and MPPSK modulated data is demodulated by using correlation matching. According to the system, the frequency resource and the 9 kHz bandwidth division of the conventional medium-wave amplitude modulation broadcast band, the infrastructures of an amplitude modulation broadcast transmitter, the broadcast system of DSB-AM (Double Sideband Amplitude Modulation) transmission and a mature product of a medium-wave amplitude modulation radio are directly used to realize that the original analogue sound signal and a new digital code stream are really broadcast at the same bandwidth on the same channel at the same time, so that the spectrum utilization efficiency and the energy utilization rate of the digital AM broadcast system are greatly improved.

A method for an antenna architecture that handles US band cellular and broadcast channels may be provided. The method may comprise receiving at a first radio frequency integrated circuit (RFIC) integrated within a mobile terminal, first signals via a first antenna, where the first signals comprise signals within a 1900 MHz band. The method may further comprise receiving at a second RFIC integrated within the mobile terminal, second signals via the first antenna, where the second signals comprise signals within at least one of a 1900 MHz band and a 850 MHz band and receiving at a third RFIC integrated within the mobile terminal, third signals via the first antenna, where the third signals comprise signals within a VHF / UHF broadcast band.

Aspects of a method and system for an integrated local oscillator generator for an integrated FM radio are provided. In this regard, a FM radio receive path and / or a FM radio transmit path may utilize one or more signals which are a frequency scaled version of a generated signal. In this regard, the frequency scaling may be performed by one or more configurable frequency dividers which may be programmably controlled by a processor. The generated signal may be in the range of about 990 MHz to 1190 MHz such that harmonics of the generated signal do not interfere with coexistent wireless technologies. Additionally the frequency scaled version may be in the frequency range of about 76 MHz to 108 MHz such that FM Radio signals in a FM broadcast band may be transmitted and / or received. The frequency scaled versions of the generated signal may comprise in-phase and quadrature components and may be utilized to up-convert and / or down-convert FM radio signals.

The invention provides a separation method and receiving device of a digital broadcasting analog-to-digital (A / D) signal at a frequency modulation (FM) broadcast band. The separation method comprises the following steps: adding two neighboring vector signals in in-band-on-channel (IBOC) A / D mixed signals S, eliminating component of a digital signal dm to obtain x<2m>+x<2m>+1, and then obtaining amplitude and phase, wherein, the nth component of x<2m> and x<2m>+1 can be those of phase modulation signals ej alpha and ej beta; solving parameters theta and delta to obtain x<2m> and x<2m>+1; and restoring the digital signal dm. In the method, the designed antenna of the receiving device is sequentially connected with a tuning module, an A / D converter, a digital down converter (DDC) and a re-sampling module; output of the re-sampling module is switched in an A / D signal separation module with a concrete calculation program to obtain corresponding analog FM signals and digital signals; the signals are respectively accessed to a digital signal demodulator / decoder of an analog FM receiver; and finally an analog sound signal, a digital audio signal and a data signal which are sent from a sending end are obtained finally. The separation method has the advantages of good A / D signal separation effect, capability of eliminating mutual interferences and reliable performance and is easy to achieve.

To realize a service of data content that can interlock with AV content of programs without providing a band for broadcasting data content in a broadcast band for digital television broadcast, provided is a reception apparatus that receives an audio and / or video (AV) content, the apparatus including: an extraction section to extract trigger information from the AV content, the trigger information being related to an application program that is executed interlocking with a progress of the AV content, the trigger information including a trigger type; and a control section to control one of an activation of the application program, a dispatch of an event of the application program being executed, and an end of the application program being executed in accordance with the trigger type included in the extracted trigger information.

A receiver system and audio processing method for use therewith are provided. The system includes pairs of receivers with each pair receiving broadcasts on a unique broadcast band. A decoder converts the received signal to a character representation thereof. A user selects a broadcast band and frequency as well as search criteria. One of the receivers is tuned to the user-selected frequency and outputs the program associated with the received broadcast signal to an audio output device. Simultaneously, the broadcast band associated with each of the remaining receivers is scanned with the character representation of each of these broadcast signals associated therewith being compared with the search criteria. A match with the search criteria is identified to allow the user to uncouple the tuned receiver from the audio output device and couple a designated one of the receivers that produced the match to the audio output device.

An apparatus and a method for receiving two broadcast modes using one tuner in a Set-Top-Box (STB) are provided. The integrated tuner unit receives a broadcast signal of at least one of a DSG scheme and an OOB scheme to tune a desired broadcast band, and converts the broadcast signal into at least one Intermediate Frequency (IF) signal. The switching unit switches the at least one IF signal to at least one of the DSG demodulator and the OOB demodulator. The DSG demodulator demodulates the at least one IF signal according to the DSG scheme, when the broadcast signal of the DSG scheme is received. The OOB demodulator demodulates the at least one IF signal according to the OOB scheme, when the broadcast signal of the OOB scheme is received.