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7298202 FSK demodulator  
An FSK demodulator which outputs an enable signal in response to the detection of a data change point in a detected signal of an amplitude associated with the received frequency of an input FSK...
7116964 Signal reception and processing method for cordless communications systems  
Channel selection of a received signal is first of all carried out, in the process, by way of an analog channel selection filter. The signal is then converted to a digital discrete-time and...
7026864 Non-coherent FSK demodulator  
A non-coherent frequency shift key demodulator comprising an oversampling device, a chain of registers, and a threshold device is disclosed. The oversampling device receives an input digital...
7015749 Frequency discriminator using replica compensated delay lines and method of operation  
A frequency discriminator for detecting phase shifts between sequential pulses in a frequency-shift keyed (FSK) signal having a nominal frequency, f. The frequency discriminator comprises: 1) a...
6990157 All-digital FSK demodulation with selectable data rate and adjustable resolution  
All-digital FSK demodulation can be accomplished by producing in response to a received IF signal digital information ( 22 ) indicative of a frequency of the IF signal. A symbol represented by the...
6933776 Signal demodulating method of a two-phase frequency shift keying (FSK) digital demodulator  
There is provided a signal demodulating method of a two-phase frequency shift keying (FSK) digital demodulator. The method utilizes at least a detect circuit respectively detecting and collecting a...
6836181 FSK demodulation system  
A FSK demodulation system of the present invention has a means for comparing two preset values across 0, a positive side level shift amount and a negative side level shift amount, with an inputted...
6703896 Method and demodulator for FSK demodulation, and receiver including such a demodulator device  
In a method for demodulating an analog FSK signal (FSKin), a current sample (Id(k);Id i ) of the downconverted and digital inphase component is multiplied with a previous sample (Qd(k−1);Qd i−1...
6639458 FM demodulator capable of providing demodulated data with high determination accuracy  
An FM demodulator for reproducing data by performing FM demodulation of a received RF signal in a Bluetooth transmission system is provided. The FM demodulator includes a frequency discrimination...
6396338 Variable delay line detector  
A variable delay line detector ( 34, 48, 66 )includes a power splitter ( 36, 50, 68 ), a mixer ( 44, 62, 72 ) and a variable delay line ( 42,52, 70 ). Various devices are suitable for the variable...
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...
6144253 Digital FSK demodulator  
A FSK demodulator which uses the combination of a digital phase comparator and a digital controlled oscillator (DCO) in the form of a state machine to demodulate an FSK signal. The phase comparator...
6121829 Frequency demodulator  
A frequency demodulator of the present invention includes: an amplification section for receiving a frequency-modulated signal and amplifying the frequency-modulated signal based on a gain so as to...
6046628 Demodulating device comprising a small circuit and a small consumption power  
In a demodulating device which comprises an orthogonal transforming circuit, an up-converting circuit, a pulse signal producing circuit, and a low-pass filter, the orthogonal transforming circuit...
5999577 Clock reproducing circuit for packet FSK signal receiver  
A circuit is provided by which in the case of the transmission of a short packet signal through an FSK transmission channel having a frequency error for transmission and reception, directly from...
5966406 Method and apparatus for noise burst detection in signal processors  
A method and apparatus for noise burst detection in a signal processor is provided. The method and apparatus is based on the zero-crossing rate (ZCR) of the received signal, which is defined as the...
5949280 Multivalued FSK demodulation window comparator  
A multivalued FSK demodulation window comparator includes an MSB comparator, an LSB comparator, a reception electric field strength detector, and a reference voltage generating circuit. The MSB...
5942937 Signal detection circuit using a plurality of delay stages with edge detection logic  
A signal detection circuit employs a delay line with edge detection logic for capturing and buffering timing information about an input signal. A plurality of comparators for comparing the input...
5917871 Bit synchronization circuit and method capable of correct bit synchronization for both 2-value and 4-value FSK transmission signals  
A bit synchronization circuit receives polarity-judged output signal and a level-judged output signal that are produced through demodulation of a 2-value FSK or 4-value FSK transmission signal....
5903186 Demodulator of MSK signal  
A demodulator for demodulating an MSK signal constituted by a sequence of MSK modulated symbols is disclosed. An exclusive OR signal obtained by delay detection is delayed by delay times shorter...
5828238 Digital frequency discriminator  
A frequency discriminator circuit that includes a signal shaping and power splitting circuit (20) responsive to a sinusoidal RF input signal for providing first and second substantially identical...
5822378 Receiver, a demodulator, and a demodulation method  
Known is a receiver having a demodulator for intermediate frequency modulated frequency shift keyed signals. The known demodulator applies absolute period time measurements expressing the period of...
5818881 Digital frequency demodulator  
A digital frequency demodulator includes a first counter and a second counter measuring the instantaneous and mean values of the period of a frequency modulated signal. A comparator compares the...
5809097 Low jitter phase detector for phase locked loops  
A digital phase detector which generates low jitter when the phase-locked-loop is in lock. A delay line, combined with an UP/DOWN phase detector causes substantial overlap in the UP and DOWN...
5808509 Receiver and demodulator for phase or frequency modulated signals  
In a quadrature receiver for phase and/or frequency modulated signals an intermediate phase signal is quantized to produce a quantized phase signal. The receiver includes a demodulator in which...
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...
5783967 Frequency shift keying demodulation circuit using logic circuitry  
A miniaturized FSK demodulation circuit for accurately demodulating a signal having a small modulation index comprises a multiplier for multiplying a FSK modulated input signal by 4, an oscillator...
5781064 Digital filtering system for filtering digital outputs of a four level FSK demodulator  
A digital filtering system for filtering a first and a second digital signals inputted from a FSK (frequency-shift-keying) demodulator to generate a first and a second filtered digital signals. The...
5724001 Method and apparatus for demodulating a frequency shift keyed signal  
A receiver (100) is utilized for demodulating a multi-level frequency shift keyed (FSK) signal. The receiver (100) includes a mixer (102) for mixing the multi-level FSK signal to generate an...
5686869 Pulse-width modulating device  
A pulse-width modulating device comprises: a counter for generating a plurality of counter signals of n-bit, where n is an integer of 2 or more; a fundamental waveform generator for outputting a...
5684837 Adjustable digital FSK demodulator  
An apparatus and method for demodulating a frequency-shift keyed (FSK) signal to provide a data signal. An input FSK signal is processed in a waveform reshaper to generate a first pulse signal...
5612976 Detectors  
A direct conversion Binary FSK radio receiver has an AFC loop comprising an Exclusive-Or phase detector 104 responsive to the I 3 and Q 3 signals. I and Q filters 100, 101 are not identical but...
5550505 Frequency shift keying (FSK) demodulator for use in low signal-to-noise ratio environments  
A frequency-shift keying (FSK) demodulator demodulates a binary signal encoded in an FSK signal. The present invention employs a bandpass filter to filter out noise and pass the frequencies used in...
5539355 Frequency-shift-keying detector using digital circuits  
A signal modulated by frequency-shift keying is input to a detector consisting of an instantaneous phase detection circuit that detects the instantaneous phase of the input signal, a...
5514998 Method and system for demodulating GMSK signals in a cellular digital packet data system  
A decision feedback multiple symbol differential demodulator for Gaussian filtered Minimum Shift Keying (GMSK) has a performance very close to theoretical limit even under a fading channel. The...
5453714 Binary FM demodulator with self-adjusting resonant operating frequency according to demodulated binary output signal duty cycle  
A demodulator for demodulating a binary frequency-modulated signal includes a demodulator with a quadrature tank circuit and a duty cycle monitor circuit. The quadrature tank circuit has a...
5450032 FSK data demodulator using mixing of quadrature baseband signals  
A first demodulator for generating a demodulated signal by demodulating first and second baseband signals obtained from a received frequency shift keying signal, comprises: a first mixer for mixing...
5446762 Data demodulation circuit for FSK modulated RF signal receiver providing wide-band 90° baseband phase shifting  
An FSK radio receiver of direct conversion type, which derives baseband in-phase and phase quadrature signals from a received FSK RF signal in respective mixers by applying local oscillator signals...
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...
5436589 Demodulator for frequency shift keyed signals  
A demodulator (414) for improving bit error rate performance where alternating bit patterns produce the worst occurrences of bit errors. The demodulator (414) consists of a zero threshold...
5436590 Digital FSK demodulator with automatic offset cancellation  
A digital FSK demodulator used in e.g. a telephone loop produces unequal amplitudes in detected mark and space tones. The inequality or offset must be cancelled so that a proper timing signal can...
5373533 FSK signal receiving device  
An FSK signal receiving device is constituted by a first phase shifting circuit for applying a first phase shift to a first reception base band signal of first and second reception base band...
5333151 High speed frequency-shift keying decoder  
A frequency-shift keying (FSK) signal detector splits an FSK signal into two paths. In one path, a phase-altering circuit having a variable frequency characteristic between the two encoding...
5311556 Digital FSK transmitter receiver and method of operating same  
A digital FSK receiver includes a zero-crossing detector which detects the zero crossings in an FSK signal having at least two signal frequencies. The time interval between zero crossings is then...
5309113 FSK data demodulator  
An FSK demodulator for demodulating first and second baseband signals obtained from a received frequency shift keying signal, the first and second baseband signals having a quadrature relation...
5293408 FSK data receiving system  
A data receiving system comprising an I base-band signal and a Q base-band signal which are used in a quadrature demodulation operation. Zero-crossing points of respective base-band signals are...
5278514 MSK demodulator using one synchronous detector  
An MSK signal demodulating circuit including a carrier reproducing circuit for reproducing a carrier phase-synchronized with a component of a mark frequency or a space frequency of an MSK signal, a...
5197085 Radio receiver  
A receiver for FSK signals produces quadrature related first and second frequency down-converted difference signals (I and Q), which are amplitude limited to form respectively first and second...
5155446 Digital FSK demodulator  
Digital FSK demodulators to be used in the telephone environment are disclosed. The demodulator according to one embodiment uses the sequential processing of a digital signal encoded in the...
5150382 Frequency error detecting apparatus  
A frequency error detecting apparatus for an FSK signal communication system in which data symbols are represented by frequencies displaced from a center frequency, includes a counter for counting...
Matches 1 - 50 out of 123 1 2 3 >