子分类：
| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 61 | Wireless system and transmitter/receiver | JP15722686 | 1986-07-05 | JPS6214541A | 1987-01-23 | MARSHALL CHRISTOPHER BRIAN |
| 62 | Amplitude modulation system receiver | JP11324985 | 1985-05-28 | JPS61273005A | 1986-12-03 | TAKAYAMA KAZUO |
| PURPOSE:To attain always excellent reception by multiplying two reference waves whose phase differs by 90 deg. with a reception wave, applying a prescribed operation to its output so as to obtain a demodulation signal thereby eliminating the need for the synchronization with the reception wave for the reception wave detection. CONSTITUTION:At first, an electronic tuning control circuit 36 sets the oscillation frequency of a voltage controlled oscillator 34 to a frequency of a channel to be received. The reception input wave is multiplied respectively with the oscillation output wave subjected to 90 deg. phase shift by a phase shifter 35 and the oscillation output wave from the voltage controlled oscillator 34 by multipliers 24, 23. Only the low frequency component is extracted from the multiplication output of the multipliers 23, 24 via low-pass filters 25, 26 and a demodulation signal component is extracted. Let the output of the low-pass filter 25 be (x) and the output of the low-pass filter 26 be (y), they are expressed in equation I. Then the operation of (x<z>+y<z>)<1/2> is performed by multipliers 27, 28, an adder 29 and an operation circuit 30, the output (z) of the operation circuit 30 is expressed in equation II and the reception wave is detected always normally even if the phase difference theta is changed. | ||||||
| 63 | Demodulating method and its circuit | JP19692884 | 1984-09-21 | JPS6089189A | 1985-05-20 | JIERAARU RU FUROSHIYU |
| 64 | Am detection circuit | JP13719283 | 1983-07-26 | JPS6028305A | 1985-02-13 | TANAKA SHIYOUICHI |
| PURPOSE:To improve the S/N of an AM detection circuit by generating a difference output of detected outputs of two detection circuits generating the detected outputs opposite to each other. CONSTITUTION:An AM wave having a maximum peak value of >=1V is inputted to the 1st detection circuit 5 detecting a positive envelope 2 and to the 2nd detection circuit 6 detecting a negative envelope 3 from an input line 4. Further, the detected outputs V1, V2 are subtracted with each other by a differential amplifier 7 and an output signal voltage V0 becomes 2Vs+2<1/2>VN1, where Vs is a signal voltage to the 1st and 2nd detection circuits, and VN1, VN2 are independent noise voltages respectively to the 1st and 2nd detection circuits. although the common mode noise in the 1st and 2nd detection circuits is cancelled together, the amplitude modulation noise having the same band as that of a carrier 1 cannot be separated. | ||||||
| 65 | Ac-dc converter | JP21444182 | 1982-12-07 | JPS59104805A | 1984-06-16 | YANAGI MASAHIRO |
| PURPOSE:To enable a DC converting output to be followed to an input by taking an output of a sample-and-hold circuit as the DC converting output, when an input frequency to be converted is within the range of DC - nearly 500kHz and even if an amplitude modulation frequency ratio is close to said frequency. CONSTITUTION:An AC input signal J as an input signal to be converted is rectified by a COV, the rectified signal is charged into a capacitor C1, which is reset by operating a set switch S1 at a prescribed interval being >=1/2 wavelength of the input signal J, and a voltage value just before the reset of the capacitor C1 is sampled and hold 6 repetitively, and this holding value is taken as the DC converting ouput. Thus, the DC converting output following the input is obtained quickly and accurately even if the amplitude variation frequency ratio to the input frequency is very close when the input signal to be converted is within the range of DC - nearly 500kHz. | ||||||
| 66 | Am demodulator | JP21443982 | 1982-12-07 | JPS59104804A | 1984-06-16 | TANAKA MASANOBU; OMOTANI YOSHIROU; KITANI TERUO |
| PURPOSE:To obtain an AM demodulator possible for operation by using the clock signal not in synchronizing with an AM signal to be demodulated. CONSTITUTION:An amplitude signal 14 to be demodulated is sampled by a clock frequency N times (where, N>=2) the carrier frequency of the signal. The value obtained by dividing the difference between a sample value Xk-1 before one clock and a sample value Xk+1 after one clock by 2sin (2pi/N) is squared and added this value to the squared value of a present sample value Xk. The square root of said summed value, i.e. the value expressed in the figure is outputted. Where Ak is a modulating signal component at a sample point. Thus, it is possible to use a clock signal not in synchronizing with the demodulation of an AM signal, thereby making the constitution of a clock generating circuit 13 easy and enabling an FM signal to be demodulated. | ||||||
| 67 | Orthogonal detecting circuit | JP13092681 | 1981-08-21 | JPS5833305A | 1983-02-26 | TAKEDA KOUICHIROU |
| PURPOSE:To keep the accurate orthogonal property of an orthogonal detecting circuit and to improve the yield of an IC module, by giving the prescribed weighting to one side of the output of the orthogonal detection and then adding this weighted output to the other output of the orthogonal detection. CONSTITUTION:When the orthogonal degree is set at 90 deg. for an orthogonal detecting circuit 11, the outputs of detectors 1 and 2 are set as X=Ksintheta and Y'= Kcostheta (theta: phase of input signal; K: a constant). If the orthogonal degree has a shift by delta, Y'=Kcos (theta-delta) is satisfied. Then Ksintheta in delta is mixed into Y'. When the values alpha and beta of a coefficient device 8 and a coefficient device 10 are set at - sindelta and 1/cosdelta respectively, alpha is added to Y' by an adder 9 for an output Y of a wave detection output terminal 6 in the direction Y. At the same time, the value beta of the unit 10 is multiplied by the output Y. Therefore Y=[Y'+ (-sinX)]X1/cosdelta=Kcostheta is satisfied, and the 90 deg. orthogonal value is obtained to an output X of a detection terminal 5 in the direction X. As a result, the variation of a phase shifter 3 is compensated and the yield is greatly improved. | ||||||
| 68 | JPS5541061B2 - | JP6446176 | 1976-06-02 | JPS5541061B2 | 1980-10-22 | |
| 69 | Demodulator circuit | JP3840677 | 1977-04-04 | JPS53123650A | 1978-10-28 | MOTOMIYA MASAYUKI; TOKUHARA MASAHARU; YAMAMOTO YOSHIHIRO; KAWAKAMI HIROMI |
| PURPOSE: To make a good synchronous detection possible by delaying the phase of main signals and having the carrier phase in main signals and the switching carrier phase coincide with each other in the demodulator circuit of TV video signals, etc. COPYRIGHT: (C)1978,JPO&Japio | ||||||
| 70 | JPS4922586A - | JP4374873 | 1973-04-19 | JPS4922586A | 1974-02-28 | |
| 71 | Phase sector based RF signal acquisition | US13651259 | 2012-10-12 | US09490944B2 | 2016-11-08 | David K Nienaber |
| Values representative of modulation signal components are extracted from a modulated signal. The modulated signal contains a modulation signal. A local clock signal is developed which correlates in time to the modulated signal and has a plurality of non-overlapping phase sectors per cycle. The modulated signal is accumulated into an accumulated value, separately for at least one phase sector of one cycle of the local clock signal. Each accumulated value is representative of a modulation signal component. The modulated signal accumulated is of an amount representative of the mathematical integral of the modulated signal during each phase sector of the local clock over which the modulated signal is accumulated. | ||||||
| 72 | Method and device for detecting aircraft radio signals transmitted in the same channel simultaneously | US14237025 | 2012-07-17 | US09429603B2 | 2016-08-30 | Thorben Detert |
| A method for detecting at least two amplitude-modulated transmitted signals contained in a received signal within the same frequency channel with respectively different frequency displacements, which determines from the received signal a modified received signal by means of a nonlinear signal processing. Following this, the spectrum of the modified received signal is determined by means of Fourier transform, and at least two transmitted signals contained in the received signal are detected if at least two first spectral lines each associated with carrier signals are significantly distinguishable within the determined spectrum from spectral components associated with noise signals and payload signals. | ||||||
| 73 | DEMODULATION DEVICE, AND DEMODULATION INTEGRATED DEVICE AND MODULATION AND DEMODULATION INTEGRATED DEVICE USING THE SAME | US13980861 | 2012-12-07 | US20150318823A1 | 2015-11-05 | Seung Young Park; Sang Il Kim |
| A demodulation device according to the present invention includes a spin device configured to output an oscillation signal; a phase control unit configured to assign a predetermined phase locking characteristic to the spin device, thereby causing the oscillation signal to be tuned to a modulation signal that is input to the spin device; and a detector configured to demodulate the oscillation signal that is output by the spin device and tuned to the modulation signal, thereby restoring information carried on the oscillation signal. | ||||||
| 74 | Systems and methods providing signal power detection using low performance circuitry | US13687899 | 2012-11-28 | US09171457B2 | 2015-10-27 | Tim Magnusen; Michael D. Womac |
| Systems and methods which utilize low performance circuitry to provide received signal power detection without unacceptably impacting operation of a receiver circuit are shown. Circuitry utilized to provide received signal power detection according to embodiments comprises circuitry dedicated for use with respect to received signal power detection. Performance of the circuitry of the detection path may be lower than that required of circuitry of the signal processing path. However, performance parameters are selected to provide power detection of desired accuracy (e.g., flat gain) and to meet other performance metrics. Embodiments provide a low performance power detection circuit comprising a low performance tuner configuration. Further embodiments provide a low performance power detection circuit comprising a low performance data converter configuration. | ||||||
| 75 | AMPLIFIER CIRCUIT, ANTENNA MODULE AND WIRELESS COMMUNICATION APPARATUS | US14428238 | 2013-09-11 | US20150229346A1 | 2015-08-13 | Masaaki Tsuji; Kohji Kawahata; Nobunari Tsukamoto; Naohiro Itoh |
| An amplifier circuit that amplifies a carrier wave that a transmitting and receiving part has received, and includes a superimposition wave generation part that generates a superimposition wave to be superimposed onto the carrier wave; an amplifying part that adds the carrier wave and the superimposition wave to obtain an amplified carrier wave and outputs the amplified carrier wave; and an amplitude detection part that detects, based on a change in an amplitude value of the carrier wave, that the carrier wave is a predetermined carrier wave that carries a predetermined communication signal. The amplifier circuit outputs the amplified carrier wave when having detected the predetermined carrier wave. | ||||||
| 76 | Receiver device, system, and method for low-energy reception of data | US13681135 | 2012-11-19 | US09083580B2 | 2015-07-14 | Frank Schmidt |
| A receiver device, A system and a method for reception of a signal having an amplitude that has been modulated with information, wherein a resistive element is provided that converts an electrical quantity into a physical parameter. | ||||||
| 77 | DEMODULATOR FOR WIRELESS POWER TRANSMITTER | US14307644 | 2014-06-18 | US20150069849A1 | 2015-03-12 | Masatoshi WATANABE; Manabu MIYATA; Tatsuya IWASAKI; Tomoya MORINAGA |
| A demodulator is mounted on a wireless power transmitter that conforms to the Qi standard, and demodulates an amplitude modulated signal superimposed on a coil current ICOIL that flows through a primary coil of a transmission antenna, or otherwise on a coil voltage across both ends of the primary coil. Multiple demodulating units are each configured to have respectively different configurations, to operate in parallel, to extract a demodulated component from the coil current ICOIL or otherwise from the coil voltage, and to generate baseband signals as demodulated signals. A signal processing unit employs a baseband signal that is correctly received, from among the multiple baseband signals generated by the multiple demodulating units, based on an error detection result obtained using a checksum. | ||||||
| 78 | Phase Sector Based RF Signal Acquisition | US13651259 | 2012-10-12 | US20140105254A1 | 2014-04-17 | David K. Nienaber |
| Values representative of modulation signal components are extracted from a modulated signal. The modulated signal contains a modulation signal. A local clock signal is developed which correlates in time to the modulated signal and has a plurality of non-overlapping phase sectors per cycle. The modulated signal is accumulated into an accumulated value, separately for at least one phase sector of one cycle of the local clock signal. Each accumulated value is representative of a modulation signal component. The modulated signal accumulated is of an amount representative of the mathematical integral of the modulated signal during each phase sector of the local clock over which the modulated signal is accumulated. | ||||||
| 79 | RECEIVER DEVICE, SYSTEM, AND METHOD FOR LOW-ENERGY RECEPTION OF DATA | US13681135 | 2012-11-19 | US20130287146A1 | 2013-10-31 | Frank SCHMIDT |
| A receiver device, A system and a method for reception of a signal having an amplitude that has been modulated with information, wherein a resistive element is provided that converts an electrical quantity into a physical parameter. | ||||||
| 80 | APPARATUS AND METHOD FOR ENVELOPE DETECTION | US13481998 | 2012-05-29 | US20130089127A1 | 2013-04-11 | Ui Kun KWON; Sang Joon KIM |
| An apparatus and a method are described for envelope detection used in fields including voice processing, image processing, data communication, and energy/data transmission. The apparatus and the method for envelope detection eliminate a carrier component from a modulated signal by performing a square-sum operation between two adjacent sampling signals among signals sampled from the modulated signal. The apparatus and the method detect an envelope of the modulated signal from the modulated signal in which the carrier component is eliminated. | ||||||
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