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A self defense weapon formed as a memo pad and which is easily held by a person's fingers, therefore making it possible to provide protection from a mugger and also to quickly and easily write a record or a message without failure of missing or forgetting significant information under a stressful situation.
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| Number | Title | Issue Date |
| 7671671 | Device and method for the demodulation of modulated electric signals A demodulation device (1) in semiconductor technology is disclosed. The device (1) is capable of demodulating an injected modulated current. The device (1) comprises an input node (IN1), a sampling stage (DG1, IG1, GS1 | 03/02/2010 |
| 7449945 | Phase demodulator and portable telephone apparatus A phase demodulator has a high frequency amplifier which amplifies a received signal modulated by phase, a voltage control oscillator which conducts oscillation operation in tune with the received signal amplified by the high frequency amplifier, a phase comparator ... | 11/11/2008 |
| 7248649 | Digital baseband receiver including a time domain compensation module for suppressing group delay variation distortion incurred due to analog low pass filter deficiencies A digital baseband (DBB) radio frequency (RF) receiver used for receiving and processing a wireless communication signal. The DBB receiver includes a demodulator, first and second analog low pass filters (LPFs), first and second digital gain control circuits, and a ... | 07/24/2007 |
| 7239431 | System and method for recovering primary channel operation in a facsimile receiver and facsimile machine incorporating the same A system for, and method of recovering primary channel operation in a facsimile (fax) receiver and a fax machine that incorporates the system, the method or both. In one embodiment, the system includes: (1) a signal receiver that receives a signal containing first a... | 07/03/2007 |
| 7233895 | Apparatus and method to compensate for unsynchronized transmission of synchrous data using a sorted list A low energy detector maintains a sorted list that defines to the circuit removing samples from the queue the location and energy of all samples that fall below the predetermined energy level. This allows a circuit removing samples to execute an algorithm that allow... | 06/19/2007 |
| 7190216 | Demodulation circuit and receiving set In a sampling block 40a-1, an intermediate frequency signal RIFs is sampled at a frequency of the intermediate frequency signal RIFs multiplied by “1/(m+0.25)” or “1/(m+0.75)” (m: 0 or natural number), to generate signals having phase di... | 03/13/2007 |
| 7190742 | Differential receiver circuit with electronic dispersion compensation The invention describes a number of differential, balanced high-speed circuits that permit the design of a receiver with Electronic Dispersion Compensation (EDC) on a single semiconductor substrate, including the functions of an analog Fast Forward Equalizer (FFE), ... | 03/13/2007 |
| 7161996 | Multi-antenna wireless receiver chains with vector decoding A receiver chain is provided for use in wireless data communication including a plurality of receive antennas and a vector Barker decoder or a CCK decoder. The vector Barker decoder operates on the plurality of received signals, preferably processed through a plural... | 01/09/2007 |
| 7129794 | Phase detector for reducing noise The present invention provides a method and an apparatus for reducing noise. The apparatus includes a phase detector adapted to determine a phase difference between a first and a second signal, a first circuit adapted to generate a control signal based upon the dete... | 10/31/2006 |
| 7079577 | Wide window decoder circuit for dual phase pulse modulation A dual phase pulse modulation (DPPM) decoder circuit processes a DPPM signal, which is in the form of a series of high and low pulses whose pulse widths represent successive groups of M data bits, so as to recover data carried by the signal. Each of the 2M | 07/18/2006 |
| 7069034 | Systems and methods for reduced forward link power control delay A communication system includes a mobile terminal and a base station. The mobile terminal estimates signal quality of a forward link during a first power control group period and determines a power control bit based on the estimated signal quality. The mobile termin... | 06/27/2006 |
| 7049936 | Validation of the presence of an electromagnetic transponder in the field of a reader A method for controlling an electromagnetic field generation terminal using a signal for exciting an oscillating circuit, provided with circuitry for regulating the signal phase in the oscillating circuit, including comparing current values of variables linked to th... | 05/23/2006 |
| 7023391 | Electromagnetic field generation antenna for a transponder An antenna for generating an electromagnetic field including several planar inductive cells parallel connected in an array and forming, in association with at least one capacitor, an oscillating circuit adapted to being excited by a high-frequency signal. ... | 04/04/2006 |
| 7006562 | Phase demodulator, phase difference detector, and interferometric system using the phase difference detector A phase demodulator is used for measuring a phase difference between a phase-modulated test signal and a phase-modulated reference signal having fixed carrier frequencies. The phase demodulator includes an amplitude control device for adjusting amplitudes of the tes... | 02/28/2006 |
| 6859094 | Phase demodulation method for minimizing phase error in communication signals Disclosed is a phase-demodulation method for minimizing the phase error of a communication signal. The phase-demodulation method for demodulating a phase-demodulated communication signal using a digital phase-demodulation algorithm includes the steps of: adding one ... | 02/22/2005 |
| 6765435 | Phase locked loop demodulator and demodulation method using feed-forward tracking error compensation In embodiment, the present invention is directed to a PLL phase demodulator that utilizes feed-forward error correction. The feed-forward error correction may occur by calibrating an equalizer to possess transfer function that emulates the modulation response curve ... | 07/20/2004 |
| 6744827 | Demodulator arrangement, method to demodulate, and telecommunication system comprising such a demodulator arrangement A demodulator arrangement, suitable to demodulate data symbols modulated in accordance with a predefined constellation diagram and sent as part of information bursts (A1, B1, C1, D1, A2, B2, C2, D2) over a tran... | 06/01/2004 |
| 6727985 | System and method for signal acquisition in a distance meter A system for signal acquisition in a distance meter includes at least one photoelectric receiver that detects electromagnetic radiation that is high-frequency modulated via a modulation frequency and converts the same to high-frequency electrical signals (HF). A dev... | 04/27/2004 |
| 6724847 | Feed-forward symbol synchronizer and methods of operation therefor A feed-forward symbol synchronizer (200, FIG. 2) samples symbols transmitted within one or more packets that form a burst of radio frequency (RF) energy. The symbol samples (209) are delayed in a data delay buffer (214) while a phase esti... | 04/20/2004 |
| 6700940 | Carrier reproduction circuit A carrier reproduction circuit which can perform stable carrier reproduction even when reception takes place with low C/N values is provided. The reception phase of the demodulated known-pattern reception signal is detected with a frame synchronizing timi... | 03/02/2004 |
| 6611571 | Apparatus and method for demodulating an angle-modulated signal An angle demodulator in which an FM modulated wave is converted into an IF signal (SI) in the form of digital so as the signal is supplied to a Hilbert transformer (81) and to an outer product calculation section (82). The Hilbert transformer (81) allows ... | 08/26/2003 |
| 6407629 | Sample and hold demodulator circuit In accordance with an embodiment of the invention there is provided a sample and hold demodulator circuit (200) for use in an automotive immobilizer to recover modulation information from a received modulated carrier signal (VRD). Sample and ho... | 06/18/2002 |
| 6298099 | Constant envelope modulation communication system A communication system and method for continuous phase modulation providing for transmission of a phase-modulated carrier having a phaseform representative of concurrently transmitted symbols. The phaseform of the phase-modulated signal is a sum of shift ... | 10/02/2001 |
| 6295015 | Reference generator for demodulator calibration A reference generator includes a memory that stores reference data which, when clocked out of the memory, produces an ATSC compliant VSB reference signal substantially free of sub-harmonics of the clock signal. A digital-to-analog converter converts the c... | 09/25/2001 |
| 6246729 | Method and apparatus for decoding a phase encoded data signal A method and apparatus for decoding a phase encoded data signal utilizes windowed data which is transformed into real and imaginary frequency components thereof. The real and imaginary frequency components are converted into phase and magnitude informatio... | 06/12/2001 |
| 6166594 | Self calibrating demodulator system A reference signal source produces a substantially distortion free reference signal which is supplied to a demodulator that is arranged to demodulate the substantially distortion free reference signal. A calibration filter and an equalizer are included do... | 12/26/2000 |
| 6148038 | Circuit for detecting and decoding phase encoded digital serial data A decoder circuit for decoding phase-encoded digital data signals includes a timing circuit and a signal viewer circuit coupled to logic circuitry. The timing circuit uses an edge of a received phase-encoded digital data signal to indicate when to sample ... | 11/14/2000 |
| 6112071 | Quadrature-free RF receiver for directly receiving angle modulated signal The present invention, generally speaking, provides a quadrature-free RF receiver for directly receiving RF signals such as angle modulated signals. Various embodiments of the receiver use a digital phase detector together with well-known RF components: a... | 08/29/2000 |
| 6072841 | Block phase estimator for the coherent detection of non-differentially phase modulated data bursts on rician fading channels A method, and related apparatus, for coherently demodulating phase-modulated data which is coherently transmitted (i.e., without the use of differential encoding of the data) on Rician fading channels. The method uses phase unwrapping and phase interpolat... | 06/06/2000 |
| 6064702 | Four-stage phase demodulation low frequency wireless mouse device A four-stage phase demodulation low frequency wireless mouse device is disclosed, improving a shortcoming of a conventional low frequency wireless mouse device which can not effectively overcome the signal interference and prevent the misoperations by onl... | 05/16/2000 |
| 6002298 | Reconstituted frequency modulation with feedforward demodulator Apparatus and method for estimating the angle-modulation imposed on a transmitted Radio Frequency (RF) or Intermediate Frequency (IF) carrier. The method estimates angle-modulation when communications channels add distortions such as noise to transmitted ... | 12/14/1999 |
| 5949823 | Data communication system and radio IC card system An arrangement to realize the functions of a radio card system in which power is transmitted to perform data communication. According to such arrangement, a delay line and a clock regenerating circuit such as PLL circuit which are previously necessary for... | 09/07/1999 |
| 5912929 | Method and apparatus for performing carrier detection A digital implementation for a carrier detector. The detector determines if the carrier frequency at any instant is within a predetermined frequency band. The detector further determines if the detected frequency remains within the predetermined frequency... | 06/15/1999 |
| 5898739 | QPSK demodulator for obtaining phase by arithmetic operation A QPSK demodulator that is smaller in size and lower in cost by restricting a storage capacity needed for a TAN-1 ROM to a minimum. Values of I and Q channel base band signals obtained by converting and quantizing a received signal are approxim... | 04/27/1999 |
| 5828708 | CID demodulator for DCT A system for demodulating a FSK digital signal comprising: first and second frequency detectors connected to detect the frequency of the digital signal, the first frequency detector producing an output signal whenever the digital signal is detected to hav... | 10/27/1998 |
| 5751187 | Method and device for phase-modulated signals A device and a method correct deviation when transferring an information-carrying signal between a transmitter and a receiver. The transmitter can transmit with a plurality of frequencies generated by a voltage-controlled oscillator used for phase demodul... | 05/12/1998 |
| 5724394 | Viterbi decoding method and decoder capable of eliminating phase indeterminacy In a Viterbi decoder and a Viterbi decoding method, a modulating method and a phase of a carrier wave, employed in a transmitter apparatus can be automatically followed up in a receiver apparatus. The Viterbi decoder is comprised of a phase shifting circu... | 03/03/1998 |
| 5703908 | Fixed reference shift keying modulation for mobile radio telecommunications A method and apparatus for improved mobile radio telecommunications employs the transmission of a pilot reference signal within the coherence band of the modulated carrier wave. The receiver in this system uses instantaneous phase estimation techniques of... | 12/30/1997 |
| 5606581 | Method and apparatus for the cancellation of interference in electrical systems A cancellation circuit is provided where one demodulator circuit provides a demodulated output having interference voltage owing to interference between carrier signals, between a carrier signal and noise, or a combination of both. Cancellation of interfe... | 02/25/1997 |
| 5554955 | Method and apparatus for removing the effects of co-channel interference from the message on a dominant frequency modulated carrier and for recovering the message from each of two co-channel carriers Method and apparatus for improving an estimate of a message being carried by a frequency modulated dominant carrier in the presence of co-channel interference from a subdominant carrier. An envelope detector provides an envelope signal E(t). A frequency d... | 09/10/1996 |
