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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 |
| 7848722 | Wireless transmission apparatus and modulation scheme selection method A wireless transmission apparatus that can accurately select an optimal modulation scheme on a per block basis in a multi-carrier communication system in which block division of subcarriers and adaptive modulation are performed. In this wireless transmission apparat... | 12/07/2010 |
| 7444128 | Method of estimating a high frequency carrier signal A method of estimating the carrier frequency of a signal is disclosed. The method comprising the steps of initializing a time average vector to zero, selecting a user-selectable time segment to divide a received signal into. A signal is received, and divided into th... | 10/28/2008 |
| 7330513 | Apparatus of transmitter and receiver for MIMO MC-CDMA system The invention relates to an apparatus of transmitter and receiver for Multiple Input/Multiple Output MultiCarrier-Code Division Multiple Access (MIMO MC-CDMA) systems. At the transmitter, modified orthogonal transmit diversity (MOTD) encoders are used for increasing... | 02/12/2008 |
| 7250887 | System and method for spur cancellation A system for spur cancellation comprises an input, an output, a memory, and a summer. A value corresponding to an energy level of a spur is stored in the memory. The summer is configured to receive an input signal from the input, to receive the value from the memory... | 07/31/2007 |
| 7151918 | Low reflection limiter and transmitting/receiving module utilizing same A transmitting/receiving module includes a first amplifier for amplifying a transmission signal, a second amplifier for amplifying a receiving signal, and a low reflection limiter provided on an input side of said second amplifier. There may be further provided a ra... | 12/19/2006 |
| 7139535 | Signal processing of an amplitude-modulated and/or phase-modulated high-frequency signal The invention indicates a method for signal processing of an amplitude-modulated and/or phase-modulated high-frequency signal (RF signal), in which the RF signal is broken down into two signals (FM1 and FM2) by relative phase displacement by an angle +β and −β a... | 11/21/2006 |
| 7092461 | Polyphase receivers A polyphase receiver comprises an RF front end (10 to 28) for receiving a wanted data signal modulated on a carrier signal and for producing quadrature related low IF signals, an image rejection filter formed by a polyphase filter (30) for filte... | 08/15/2006 |
| 7068986 | Method for processing radio waves, and audio system utilizing the method In multi-path regions of high wave strength, noise in produced sounds of a vehicle audio system is reduced due to controlling of amplification of radio waves received by an on-glass antenna on the basis of wave strength at a running position of a vehicle and its cha... | 06/27/2006 |
| 6546237 | Differential FM detector for radio receivers A differential FM detection of signals uses in-phase and quadrature phase signal components of a received signal in the detection process, wherein the in-phase and quadrature phase signal components are at a low intermediate frequency (IF). The in-phase a... | 04/08/2003 |
| 6192222 | Backscatter communication systems, interrogators, methods of communicating in a backscatter system, and backscatter communication methods The present invention includes backscatter communication systems, interrogators, methods of communicating in a backscatter system, and backscatter communication methods. According to one aspect of the present invention, a backscatter communication system ... | 02/20/2001 |
| 6020784 | FM demodulation circuit An FM demodulation circuit includes a phase conversion circuit which converts a frequency variation of an input signal into a phase variation and has a variable conversion characteristic, and a control current source circuit which outputs, when the level ... | 02/01/2000 |
| 6008693 | FM-sound demodulator for TV sound signals and method of detecting sound carriers For a possible simple structure, dispensing with ceramic filters, an FM demodulator for demodulating sound-FM signals comprises a controllable amplifier (1) which receives the sound signals converted to intermediate frequencies, said amplifier having a ga... | 12/28/1999 |
| 5917351 | Relay-race FLL/PLL high-speed timing acquisition device A relay-race FLL/PLL high-speed timing acquisition device according to the invention comprises a transition detector, a voltage controlled oscillator, a loop filter of PLL, a first lowpass filter, a 90° phase shifter, a second lowpass filter, and a plura... | 06/29/1999 |
| 5778310 | Co-channel interference reduction Co-channel interference of a frequency modulated signal represented by complex signal samples is reduced by amplitude limiting each sample and non-linearly filtering the limited samples. The non-linear filter low pass filters the limited samples, multipli... | 07/07/1998 |
| 5257403 | Method of subcarrier multiplication which preserves AM Information in FM systems A multiplication circuit for use in an FM television transmitter and receiver is provided. The multiplication circuit includes a limiting circuit for limiting a subcarrier supplied thereto and a dividing circuit coupled to the limiting circuit and dividin... | 10/26/1993 |
| 4792991 | FM receiver having improved audio quality in response to Rayleigh faded received signals The present invention minimizes noise pops due to Rayleigh fades by controlling receiver gain relative to the average received signal strength so that only a predetermined level of limiting occurs prior to the recovery of the audio information. The amount... | 12/20/1988 |
| 4731872 | FM TVRO receiver with improved oscillating limiter An improved FM receiver is disclosed incorporating improved oscillating limiter circuitry having an electrically tunable bandpass filter which is phase modulated by the baseband signal the phase of which has been advanced in accordance with the formula: ... | 03/15/1988 |
| 4679247 | FM receiver An improved FM receiver is disclosed incorporating improved oscillating limiter circuitry having an electrically tunable bandpass filter and variable attenuator in regenerative feedback relationship around the limiter. The electrically tunable bandpass fi... | 07/07/1987 |
| 4642490 | Amplitude variation suppression arrangements An arrangement for suppressing amplitude variation in FM signals comprises a frequency divider which frequency divides an incoming FM signal to provide frequency divided signals having two discrete levels dependent upon the amplitude of the incoming FM si... | 02/10/1987 |
| 4499605 | FM-Receiver using a ratio detector with silicon diodes An FM-receiver having an FM-channel successively comprising an RF-input stage and mixer stage (B), an IF-circuit (A) and a ratio detector (R). The ratio detector incorporates silicon detector diodes and a smoothing capacitor conductively connected to the ... | 02/12/1985 |
| 4371749 | Circuit for processing angle modulated broadcast signals A circuit is described for maintaining an input signal to a limiter used to limit amplitude excursions of a signal to be angle demodulated. Means are provided for detecting a temporary loss in signal to said limiter resulting from the loss of signal due t... | 02/01/1983 |
| 4250456 | Device for demodulating PSK-FM double modulated carrier signals A demodulator for PSK-FM double modulated carrier signals in which the carrier signal is 2N phase modulated by a main signal and frequency modulated by a sub-signal. A clock component is extracted from the received double-modulated carrier sign... | 02/10/1981 |
| 4185243 | Method and apparatus for providing a standby signal The disclosed signal generating apparatus and method is suitable for use in combination with a PM receiver to provide a standby signal for a signal processor. The standby signal system includes a clipper connected to the receiver IF; a coherent amplitude ... | 01/22/1980 |
| 4180777 | Tuning meter for use with a pulse count FM demodulation circuit A tuning meter circuit for use with a pulse count FM demodulator of an FM receiver. The circuitry comprises a limiter circuit for amplitude limiting a frequency modulated input signal to produce a train of pulses the width of which varies in accordance wi... | 12/25/1979 |
| 4126828 | Intermodulation antiinterference device for superheterodyne receiver An intermodulation antiinterference circuit for a superheterodyne receiver having a receiving antenna comprising a first high frequency amplifying circuit responsive to the receiving antenna; a local oscillating circuit; a first frequency conversion circu... | 11/21/1978 |
| 4101837 | Threshold extension FM demodulator apparatus for wide band width FM signals A tunable oscillating limiter threshold extension demodulator capable of demodulating video and other wide band width FM signals is described. A steering signal is generated to tune the oscillating limiter in response to the video output signals from an F... | 07/18/1978 |
| 4079330 | System for demodulating angle-modulated signals The inventive system demodulates angle-modulated signals. A tracking band-pass filter responds to an input angle-modulated wave signal. The tracking filter has a pass band with a center frequency controlled by a control signal. A first amplitude limiter l... | 03/14/1978 |
| 4066972 | System for demodulating angle-modulated signals The inventive system demodulates angle-modulated signals. A tracking band-pass filter responds to an input angle-modulated wave signal. The tracking filter has a pass band with a center frequency controlled by a control signal. A first amplitude limiter l... | 01/03/1978 |
| 4035730 | FM noise threshold extension demodulator apparatus Apparatus for lowering the noise threshold at which FM and other angle modulated signals may be demodulated is described wherein an oscillating limiter provided by an amplitude limiter having a bandpass filter in regenerative feedback relationship therewi... | 07/12/1977 |
| 3982186 | FM receiver with detector for multi-path reception In an FM receiver having a circuit including RF and IF amplifiers for receiving a selected FM broadcast signal, and an FM detector for converting the selected FM broadcast signal to an audio signal which is applied through an audio amplifier to a loudspea... | 09/21/1976 |
