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| Number | Title | Issue Date |
| 7376173 | Unambiguously encoding and decoding signals for wireless channels A method encodes a sequence of blocks of input bits to be transmitted over a wireless channel. Each block of input bits is converted to a codeword, and each codeword is mapped to multiple sub-blocks of complex numbers. Each sub-block is multiplied by a disambiguatin... | 05/20/2008 |
| 7376391 | Wireless data transmission between base station and transponder with encoding/decoding parameter adjusted dependent on header symbol duration Data encoded in packets modulated onto a carrier wave is transmitted between a base station and a transponder. Each packet includes a header section containing at least a reference symbol, and a further section such as a data section. In the transponder, the time du... | 05/20/2008 |
| 7363007 | Adaptive modulation/demodulation method and radio communications systems Adaptive modulation/demodulation method in a radio communication system is provided. A modulation multi-level number in a transmission device and a demodulation multi-level number in a reception device are judged independently from each other according to a propagat... | 04/22/2008 |
| 7333789 | Wide-band modulation PLL, timing error correction system of wide-band modulation PLL, modulation timing error correction method and method for adjusting radio communication apparatus having wide-band modulation PLL A broadband modulation PLL includes a PLL portion containing a voltage controlled oscillator (101), a frequency divider (105), a phase comparator (104) and a loop filter (103). A frequency-dividing ratio of the frequency divider (105 | 02/19/2008 |
| 7221911 | Multi-band ultra-wide band communication method and system The present invention provides ultra-wide band communication systems and methods, including multi-band ultra-wide band communication systems and methods. Methods and systems are provided in which frequency sub-bands of an ultra-wide band spectrum are allocated for s... | 05/22/2007 |
| 7196587 | Waveform lineariser An improved apparatus and method of generating swept frequency waveforms in the field of digital lineariser technology, using a phase-locked loop frequency synthesiser, is provided. Preferably, a ramp generator 120 is used to apply a modulation signal ... | 03/27/2007 |
| 7144290 | Discharge lamp with stabilized discharge vessel plate The invention relates to a new design of discharge vessel for a discharge lamp, in which dielectrically impeded discharges are to be generated. In this case, a discharge vessel plate 1, 9 is, as it were, of two-fold design, specifically as a first discharge v... | 12/05/2006 |
| 7142070 | Two-point modulator arrangement A two-point modulator arrangement is specified, said arrangement being developed with respect to conventional two-point modulators to the effect that the high-pass coupling-in point of the modulator that comprises a phase locked loop is formed by an expanded loop fi... | 11/28/2006 |
| 7130596 | Dynamically varying linearity system for an RF front-end of a communication device A dynamically varying linearity system “DVLS” capable of varying the linearity of a radio frequency (RF) front-end of a communication device responsive to receiving a condition signal indicating a desired mode of operation of a transmitter. The DVLS may include ... | 10/31/2006 |
| 7123666 | Gaussian minimum shift key transmitter with feedforward phase compensation A method and apparatus for generating a burst FSK signal having precisely shaped transitions between modulation states. The apparatus uses feedforward compensation of phase gain and phase preemphasis coefficients for compensating the frequency conversion gain of the... | 10/17/2006 |
| 7068740 | Processing of modulated signals In response to a first signal having modulation representing information and a modulation index, embodiments of the present invention generate a second signal that differs from the first signal in its modulation index, and demodulate the second signal. In one embodi... | 06/27/2006 |
| 7023897 | Transmission circuit A transmission circuit includes a baseband circuit, spreading section, multiplier, digital modulator, quadrature modulator, and antenna. The baseband circuit generates and outputs at least one transmission data constituted by first and second channel data. The sprea... | 04/04/2006 |
| 7012470 | Communication semiconductor integrated circuit with frequency adjustment/control circuit The present invention provides a communication semiconductor integrated circuit wherein a first control voltage for a voltage-controlled oscillator circuit is controlled based on a feedback signal sent from a PLL loop to generate a carrier frequency signal used as a... | 03/14/2006 |
| 6933798 | Trimming method and trimming device for a PLL circuit for two-point modulation In the case of a trimming method for a PLL circuit operating based on the principle of a two-point modulation, the PLL circuit is locked without any modulation being impressed and then an analog and a digital modulation signal are impressed into the locked PLL circu... | 08/23/2005 |
| 6801794 | Operating state based energy-saving display device For a terminal for mobile communication which includes a display device it is proposed to save energy by arranging a control device so as to disconnect at least a part of the display device in dependence on a relevant operating state. ... | 10/05/2004 |
| 6721539 | Communications device retroreflecting incident modulated radiation A communications device such as a personal identity card is in the form of a badge or label worn on the outside of the wearer's clothing. The badge includes a first layer of a transparent material having an inner surface that is contoured with a retroreflecting repe... | 04/13/2004 |
| 6205184 | System and method for compressing a transmitted signal to achieve narrow and very narrow band frequency or phase modulation The present system increases the number of channels in a given communication band by using narrow or very narrow band frequency modulation (FM) or phase modulation (PM). The system also improves sound quality, increases the signal-to-noise ratio, increase... | 03/20/2001 |
| 6198908 | System and a method for transfer of a digital information carrying signal A system and a method for transfer of a digital information carrying signal 51 between an input of a transmitter and an output of a receiver. The information carrying signal is modulated in a modulator included in the transmitter 12, and the modulated sig... | 03/06/2001 |
| 6034573 | Method and apparatus for calibrating modulation sensitivity A method and apparatus for continuously calibrating the modulation sensitivity of a voltage controlled oscillator (VCO) within a modulator of a transmitter. In accordance with the present invention, the transmitter is coupled to the receiver in order to l... | 03/07/2000 |
| 5983077 | Systems and methods for automatic deviation setting and control in radio transmitters A frequency modulation (FM) radio transmitter, such as a cellular telephone, includes an automatic deviation control system to automatically compensate for varying sensitivity of the FM transmitter. The FM transmitter includes a phase lock loop including ... | 11/09/1999 |
| 5907808 | Handover with fast moving mobile station detection between a microcell and a macrocell In a hierarchical micro/macro-cell network, a mobile station will be handed over from a microcell to a macrocell if a number of microcells recognize the mobile station as fast, so that the fast moving mobile stations do not cause a considerable number of ... | 05/25/1999 |
| 5832022 | Method and apparatus for controlling the modulation index of continuous phase modulated (CPM) signals A transceiver uses feedback control to monitor a transmitted continuous phase modulation (CPM) waveform, such as a spread spectrum CPM waveform, and adjust the modulation index in response thereto. Codewords are selected from a table according to a data s... | 11/03/1998 |
| 5633893 | Digital modulation method with controlled envelope variation Continuous phase modulated (CPM) signals, such as quaternary CPFSK signals, are filtered to limit their bandwidth while simultaneously minimizing the amount of amplitude modulation and intersymbol interference introduced by this filtering process. By desi... | 05/27/1997 |
| 5592132 | Frequency modulator comprising an adjusting circuit In a frequency modulator (1) having an adjusting circuit by which frequency modulator an applied luminance signal of a color video signal that contains synchronization pulses is frequency modulated, while the chrominance signal of the color video signal i... | 01/07/1997 |
| 5590417 | Radiotelephone apparatus including a wireless headset A radiotelephone includes a multifunctional headset that operates in two different modes. According to a first mode, the headset may be mounted on a radiotelephone body where it serves as a speaker and microphone for the radiotelephone. Also, the headset ... | 12/31/1996 |
| 5590402 | Multi-mode transmitter for transmitter for signals having varying deviation levels A dual-mode transmitter (100) adjusts a signal's deviation level when switched between a wideband mode and a narrowband mode of operation. The transmitter (100) automatically attenuates the deviation of the signal based on a ratio of the maximum deviation... | 12/31/1996 |
| 5513219 | Apparatus and method for transmitting information with a subminimally modulated transmission signal Applicant's invention includes an apparatus and associated method for transmitting information at a high rate using an undermodulated frequency shift keyed signal. The transmission rate is independent of the data content and the system requires no zero cr... | 04/30/1996 |
| 5423071 | Monitoring and alarm circuitry for a base station transmitting supervising signals to one or more mobile radio stations A base station is provided which supervises the quality of a radio link and including a generator circuit for generating a supervising signal having a desired baseband frequency, a measuring circuit for monitoring the level of the baseband supervising sig... | 06/06/1995 |
| 5170486 | Apparatus for synthesizing a composite RF signal suitable for use as a test signal in testing adjacent channel rejection of radio receivers Apparatus for synthesising a composite signal (53) which has spaced first and second frequency channels of which each has an independently predetermined power, the power of the first channel being substantially below that of the second, and each channel b... | 12/08/1992 |
| 4907087 | Transmission of signals through analog channels using adaptive frequency modulation Improved effifiency of frequency-modulated (FM) transmission of signals through analog channels, i.e., achievement of a higher bandwidth and/or signal-to-noise ratio (SNR) in the received signal for a given channel bandwidth and channel carrier-to-noise r... | 03/06/1990 |
| 4775995 | Adaptive splatter control An improved arrangement and method for use in a radio communication system is disclosed which makes possible mobile radio channel assignments on narrower channel spacings with a minimum amount of adjacent channel interference or splatter occurring at an i... | 10/04/1988 |
| 4581749 | Data frequency modulator with deviation control An automatic deviation control circuit for an angle modulated data transmitter is disclosed wherein the deviation level of modulated data is controlled by a modulation cancelling deviation error detection feedback loop. After the modulation is cancelled f... | 04/08/1986 |
| 4554517 | Device for the automatic linearization of the control signal-frequency characteristic of a frequency-modulated variable frequency oscillator A phase lock loop having an instruction input to which is applied the output signal of the frequency-modulated variable frequency oscillator. The pass band of the loop is regulated in order to obtain at its output, a frequency-filtered signal correspondin... | 11/19/1985 |
| 4363132 | Diversity radio transmission system having a simple and economical structure In a system for frequency-diversity transmission, separate and distinct frequency carriers are obtained from the frequency modulation of an oscillator by a pure frequency with an index such that a certain number of Bessel lines thus obtained constitute a ... | 12/07/1982 |
| 4281348 | Television signal receiving apparatus In apparatus for receiving a television signal which is made by a frequency-modulation by a video signal, the improvement is that a band-pass filter provided in the receiver for selectively taking out selected television signal is designed in a manner to ... | 07/28/1981 |
| 4223282 | Method of reducing interference components in a frequency modulated signal and device for carrying out said method A method of reducing interference components in a frequency-modulated carrier signal in which the modulating signal contains a composite color television signal with a chrominance signal modulated on a chrominance subcarrier wave. In addition to the frequ... | 09/16/1980 |
| 4062632 | Constant modulation index technique for measuring the derivatives of device parameters Described is a technique for generating directly certain derivatives of device parameters by measuring the device response to ac modulation under conditions of constant modulation index. In particular, the technique as it applies to measuring directly idF... | 12/13/1977 |
| 3967202 | Data transmission system including an RF transponder for generating a broad spectrum of intelligence bearing sidebands A data transmission system for obtaining information from a plurality of data sources includes an interrogate source for transmitting RF interrogate signals to the locations of the data sources and a transponder associated with each data source for receiv... | 06/29/1976 |
