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| Number | Title | Issue Date |
| 8188803 | Apparatus and method for digital up converting in a mobile communication system An apparatus and method for digital up converting in a mobile communication system are provided. The apparatus includes a Selectable Input Logic (SIL), a Scalable Clock Distribution Logic (SCDL), a filter logic, and a mixer logic. The SIL performs decimation at a de... | 05/29/2012 |
| 7336721 | Digital frequency modulator A digital frequency modulator is disclosed. In the digital frequency modulator, a first gain controller multiplies an input digital signal by a first gain determined according to a required modulation frequency, a phase accumulator accumulates the input digital sign... | 02/26/2008 |
| 7283012 | Tri-state pulse density modulator A tri-state pulse density modulator includes a first switch device coupled to a high voltage, and a second switch device coupled to a low voltage. An adder receives a pulse density modulation (PDM) input signal and a latched input signal to generate an output sum si... | 10/16/2007 |
| 7274753 | Method of implementing modulation and modulator A transmitter in which modulator output signal values are generated by a multi-level modulation method. The transmitter comprises a look-up table for storing a pre-defined number of values corresponding to data symbols and representing a signal or a pulse format, re... | 09/25/2007 |
| 7266171 | Phase-locked loop circuit and radio communication apparatus using the same A communication apparatus includes a phase-locked loop circuit which receives a first signal having a frequency and converts it into an output signal having a transmission frequency and includes a current output type phase comparator which converts a phase differenc... | 09/04/2007 |
| 7236541 | Translation loop modulator A translation loop modulator for a transmission circuit in a communication system includes an input modulation unit for receiving at least one input signal that is representative of information to be modulated. The input modulation unit also receives a feedback sign... | 06/26/2007 |
| 7154980 | Frequency synthesizer with on-chip registers A system and method are disclosed for configuring a frequency synthesizer to generate a frequency. Configuring a frequency synthesizer to generate a frequency includes storing a plurality of value sets in a plurality of register sets; receiving a selection sequence ... | 12/26/2006 |
| 7149269 | Receiver for clock and data recovery and method for calibrating sampling phases in a receiver for clock and data recovery A receiver for clock and data recovery includes n sampling latches (SL1 . . . SLn) for determining n sample values (SV1 . . . SVn) of a reference signal (Ref2) at n sampling phases (φ1a . . . (φna) having sampling latch inputs an... | 12/12/2006 |
| 7065157 | GMSK modulation techniques This disclosure is directed to digitally implemented GMSK modulation techniques. The digital GMSK modulation techniques make use of a lookup table (LUT) and mapping logic to digitally generate GMSK waveforms. The mapping logic can significantly reduce the size of th... | 06/20/2006 |
| 6996218 | FSK decoder for caller ID A device for processing a frequency shift keying (FSK) signal including caller ID information that comprises an analog-to-digital converter (ADC) converting the FSK signal into a digital FSK signal, the FSK signal further comprising a first frequency component, a se... | 02/07/2006 |
| 6967607 | Data converters with digitally filtered pulse width modulation output stages and methods and systems using the same A digital to analog converter including a noise shaping modulator for modulating an input digital data stream, a plurality of output elements for generating a plurality of intermediate data streams from a modulated output stream from the modulator, and an output sum... | 11/22/2005 |
| 6937666 | Wideband digital radio with transmit modulation cancellation A microwave radio assembly is described including a directional antenna wherein the installation and aiming is simplified. The assembly is attached to the wall-mount fix via gimbals mechanism with one rotation axis for azimuth and one for elevation and the assembly ... | 08/30/2005 |
| 6674812 | High IF frequencies with a lower frequency logic based FSK modulation selecting a harmonic alias and demodulation using sub-sampling techniques A cost-effective continuous phase logic-based modulator and demodulator are provided to allow communications using binary frequency shift keying (BFSK) as well as M-ary FSK techniques. The modulator of the 1-bit precision modem architecture is based on a ... | 01/06/2004 |
| 6452461 | High-speed power-efficient coded M-ary FSK modulator A high-speed power-efficient coded M-ary Frequency-Shift Keying (M-ary FSK) modulator. The modulator includes a coding logic, which generates (M/2) Gray code signals in accordance with an (N-1) bits control signal; and (M/2) switching oscillators. Each sw... | 09/17/2002 |
| 6392499 | Frequency shift modulation circuit A frequency shift modulation circuit has a direct digital synthesizer DDS and a phase-locked loop PLL. DDS stores output signal frequency data in a plurality of registers. DDS selects the register storing the frequency data in accordance with a frequency ... | 05/21/2002 |
| 6324603 | Data transmission system and game system using the same To provide a new data transmission system between a game device and related peripheral devices, and a device using same. Serial transmission data is divided into an odd-numbered bit sequence and an even-numbered bit sequence. Each bit of the odd-numbered bit s... | 11/27/2001 |
| 6317009 | Frequency shift key modulating oscillator The present invention teaches a system for selectably oscillating at a first or a second oscillating frequency. The system comprises an oscillator for providing an oscillating output. Moreover, the system comprises a switching device for selecting a first... | 11/13/2001 |
| 6313772 | Complex carrier signal generator for determining cyclic wave shape A method for generating digital carrier signals for application as the carrier to a digital modulator includes providing a first repeating sequence of complex values occurring at a given sample rate and upsampling these values to a higher sample rate. A s... | 11/06/2001 |
| 6288618 | Logic-based architecture for FSK modulation and demodulation A cost-effective continuous phase logic-based modulator and demodulator are provided to allow communications using binary frequency shift keying (BFSK) as well as M-ary FSK techniques. The modulator of the 1-bit precision modem architecture is based on a ... | 09/11/2001 |
| 6265948 | Image rejection in logic-based architecture for FSK modulation and demodulation A cost-effective continuous phase logic-based modulator and demodulator are provided to allow communications using binary frequency shift keying (BFSK) as well as M-ary FSK techniques. The modulator of the 1-bit precision modem architecture is based on a ... | 07/24/2001 |
| 6225873 | Frequency shift key modulating oscillator The present invention teaches a system for selectably oscillating at a first or a second oscillating frequency. The system comprises an oscillator for providing an oscillating output. Moreover, the system comprises a switching device for selecting a first... | 05/01/2001 |
| 6163229 | Frequency generator for generating two independent FSK signals A frequency generating circuit scales a warp range of a frequency signal. The frequency generating circuit includes a first frequency signal (10) having a first offset signal with a first frequency relationship to the first frequency signal, and a second ... | 12/19/2000 |
| 6002304 | Data modulation system using digital signal processing A modulation system is provided with a data analyzer detecting input of a modulated data and a modulation clock signal and latching and detecting an edge of the modulated data, in response to the modulated data and the modulation clock signal, a signal co... | 12/14/1999 |
| 5942955 | Quasi-GMSK modulator In order to provide a digital GMSK modulator operating sufficiently stably without aliasing distortion even with a sampling rate of twice of that of input signal, a quasi-GMSK modulator of the invention comprises: integration means (105) for integrating a... | 08/24/1999 |
| 5926072 | FM modulator using a monostable multivibrator A frequency modulation circuit includes an emitter-follower connection transistor (2), having a base supplied with a modulation signal, for generating an emitter voltage which is in proportion to a modulation signal level; and an integrated mono-stable mu... | 07/20/1999 |
| 5889443 | Frequency synthesizing circuit using a phase-locked loop A frequency synthesizing circuit has an input on which a bit flow is received, and an output on which a data-modulated output signal is supplied. The circuit moreover comprises a crystal oscillator supplying a reference clock signal, a phase-locked loop (... | 03/30/1999 |
| 5838208 | Modulation of transmission data signal in sychronous with transmission clock signal In a modulating system, a converting unit generates first and second quadrature signals based on a transmission data signal in synchronous with a transmission clock signal. First and second filters perform band limitation to the first and second quadratur... | 11/17/1998 |
| 5835539 | FSK modulator The FSK modulator for modulating binary data of the present invention has an object to provide an FSK modulator which can operate at a stable frequency also when a discontinuous data row is entered. The FSK modulator comprises a PLL (phase locked loop) in... | 11/10/1998 |
| 5789991 | FSK modulating and demodulating apparatus wherein each binary data is represented by same number of cycles of modulated signal A signal FSK-modulated with a binary data signal has first signal portions representing first logical level data contained in the binary data signal and second signal portions representing second logical level data contained in the binary data signal. Eac... | 08/04/1998 |
| 5627499 | Digital modulator and upconverter having single-bit delta-sigma data converters A method and apparatus for digitally phase modulating and frequency upconverting communication signals to an intermediate frequency, producing the IF output with only digital hardware and without the use of digital to analog converters, analog multipliers... | 05/06/1997 |
| 5485129 | Method and apparatus for digital modulation using pulse deletion An apparatus (500) for generating first and second output signals having predetermined frequency shifts relative to a frequency provided by a reference signal is included in a system comprising a phase-locked loop (206) coupled to the reference signal for... | 01/16/1996 |
| 5444415 | Modulation and demodulation of plural channels using analog and digital components In the modulation and demodulation of a plurality of frequency separated channels on a radio frequency carrier by digitally coded speech or data, the speech or data is modulated on a digitally generated sub-carrier by quadrature phase shift keying and aft... | 08/22/1995 |
| 5436599 | Method and apparatus for digital modulation using pulse addition An apparatus for generating output signals having predetermined frequency shifts relative to a frequency provided by a reference signal is included in a system (500) comprising a phase-locked loop (206) coupled to the reference signal for generating the f... | 07/25/1995 |
| 5399998 | Digital FM modulator An A/D converter (1) converts analog modulation signals, such as video signals and audio signals, into digital modulation signals. A center frequency data setting circuit (6) outputs center frequency data for setting the center frequency of an FM wave. An... | 03/21/1995 |
| 5382924 | Continuous phase frequency shift keying modulator A modulator is adapted for use in a transmitter of an information transmission signal in which the information is in the form of a frequency shift keyed code. The signal is centered on a fictional carrier frequency fc, on either side of which are emitted ... | 01/17/1995 |
| 5365548 | Digital FSK transmitter A digital FSK transmitter utilizing a clock feedback signal driving an accumulator to operate a pair of registers having a pair of preset numbers stored therein to selectively add said numbers through a binary adder to the accumulator to output the FSK si... | 11/15/1994 |
| 5361046 | Modulator having fractional sample/symbol time A modulator capable of providing a fractional sample or symbol 995486 time employs a decimation counter (23) responsive to a clock having a frequency equal to M/N×(data symbol clock), where M is an interpolation factor and N is a decimation factor, for g... | 11/01/1994 |
| 5289141 | Method and apparatus for digital modulation using concurrent pulse addition and subtraction A method and apparatus for generating an output signal (616) having a pre-determined frequency shift relative to the frequency of a reference signal from a reference frequency generator (202) comprise a digital phase-locked loop (206) coupled to the refer... | 02/22/1994 |
| 5227741 | Variable speed asynchronous modem A modem for use in a simulcast paging system includes a modulator (26) and a demodulator (30), both of which produce very low jitter, enabling the modem to be used at data rates well in excess of 1,200 baud. Both the modulator and the demodulator are impl... | 07/13/1993 |
| 5216391 | MSK modulator having a digital quadrature reference waveform generator An MSK modulator providing a high precision digital phase adjustment with a simple circuit structure. A sample data of a sine wave or cosine wave is read from a memory at an address calculated from an initial address value. The initial address value is se... | 06/01/1993 |
