| 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 | Device for pulse modulation automatic control | US259928 | 1981-05-04 | US4698637A | 1987-10-06 | Giuseppe Bertocchi |
| A device for pulse modulation automatic control, where the modulation is a combined plurality of pulse components. Each pulse component is singly controlled by a respective control voltage or current, the control voltages and/or currents being fully independent from the output demodulated pulse level and from the number, per time unit, of pulses. | ||||||
| 62 | Amplitude modulation apparatus and method | US621181 | 1984-06-15 | US4617536A | 1986-10-14 | Gordon L. Richard |
| An apparatus and a method modulate a carrier signal so that the resultant modulated signal varies between a value substantially equal to the quiescent level of the carrier signal and peak values up to several hundred percent of the quiescent level of the carrier signal. The apparatus includes an electrical circuit for adjusting the modulating signal so that it is clamped at a reference value to prevent overmodulation. The clamped signal controls a variable resistance mechanism which forms a part of the gain determining portion of a modulator circuit including an amplifier. The amplifier modulates the carrier signal in accordance with the gain determined by the variable resistance. The variable resistance is controlled by the clamped signal so that it causes the gain of the amplifier circuit to vary between approximately one and a value greater than one. So that the apparatus can be used by a person having a hearing impediment wherein the dynamic range detectable by the user is less than the dynamic range detectable by a normal ear, the apparatus also includes a circuit which compresses a detected acoustical signal which is within a first dynamic range into an electrical modulating signal within a dynamic range which is smaller than the first dynamic range and which is within the dynamic range perceivable by the user of the apparatus. | ||||||
| 63 | AM pulse duration modulator | US625694 | 1984-06-28 | US4605910A | 1986-08-12 | Dennis H. Covill |
| The present invention relates to a circuit for producing a switching modulating signal for switching a pulse duration modulator, so that the pulse duration modulator produces an output signal which is independent of the supply voltage. The circuit is comprised of an amplifier having at least one input port and an output port. The input port is connected to a modulating signal via a first resistor. A multiplier is provided which has first and second input ports and an output port. The first port of the multiplier is connected to the supply voltage, the second input port is connected to the output port of the amplifier, and the output port of the multiplier is connected via a second resistor to at least one input port of the amplifier. The switching modulating signal appears at the output port of the amplifier. This switching modulating signal, when used to switch a pulse duration modulator, provides a signal at the output of the modulator which is independent of the supply voltage. | ||||||
| 64 | Method and means for introducing additional asymmetry into audio waves | US81631 | 1979-10-04 | US4295106A | 1981-10-13 | Leonard Kahn |
| Audio processing equipment for introducing additional asymmetry so as to provide increased fullness of modulation of associated transmitters. Audio waveshapes are altered so as to accentuate the positive going portions of the waveshape. The alteration of the waveshape is typically such that the waveshape will produce positive going modulation of approximately 125% when the negative going modulation is approximately 100%. | ||||||
| 65 | Automatic modulation control in transmitter | US968797 | 1978-12-12 | US4247948A | 1981-01-27 | Hisao Okada; Yukihiro Kawamoto |
| An automatic modulation control in a transmitter, comprising an alternating modulation signal source, a modulation signal amplifier, a carrier generator, a modulator for modulating the carrier signal as a function of the output of the modulation signal amplifier, a threshold detector coupled in a direct current manner to the output of the modulation signal amplifier for threshold detecting the modulation signal output, a smoothing circuit for smoothing the threshold detected output, an amplifier for the threshold detected and smoothed output, and a control circuit for controlling the input of the modulation signal to the modulation signal amplifier as a function of the output of the threshold detected output amplifier. | ||||||
| 66 | Polarity correcting circuit | US954927 | 1978-10-26 | US4228368A | 1980-10-14 | Robert A. Orban |
| A circuit for controlling the polarity of an asymmetrical waveform, such as a typical audio waveform, is described. The circuit provides smooth polarity switching with substantially no audible switching sound. The smooth switching results from switching each frequency of the audio signal at a different time. The circuit is particularly useful in a peak-limiting apparatus such as those often used in AM broadcasting. | ||||||
| 67 | Modulated carrier frequency sources | US3737809D | 1971-09-08 | US3737809A | 1973-06-05 | PARKYN J |
| An amplitude modulated carrier frequency source has a first modulator and a first differential amplifier in a feedback loop of the first modulator, and a second modulator and a second differential amplifier in a feedback loop of the second modulator. A high level carrier frequency is applied to the second modulator and a further input of the second differential amplifier is derived from the modulating frequency. Another carrier frequency is applied to the first modulator whose associated differential amplifier has, as a further input, stabilizing output from the second modulator. A reference is thus achieved for modulation and carrier level that is a modulated carrier.
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| 68 | Automatic control for amplitude-modulated signal source | US3662290D | 1970-08-05 | US3662290A | 1972-05-09 | ELLIOTT WILLIAM S |
| An automatic level control maintains an accurate output level measurement under conditions of high modulation index by developing a control signal proportional to the deviation of output level from a desired norm. Output level is determined as a function of the time that the modulation envelope thereof exceeds a predetermined threshold. The control is independent of distortions in recovered modulation envelope waveform introduced by conventional envelope detectors due to diode offset voltage and/or high modulation index and permits independent application of carrier level and modulation index controls.
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| 69 | Feedback compressor circuit to control maximum percentage modulation | US3422356D | 1965-06-03 | US3422356A | 1969-01-14 | FRITTS REX E |
| 70 | Generation and modulation of alternating current signals | US56569544 | 1944-11-29 | US2469264A | 1949-05-03 | GOLDBERG EDWIN A |
| 71 | Load stabilizing means for modulation systems | US23507938 | 1938-10-14 | US2228692A | 1941-01-14 | DAVIES GOMER L |
| 72 | SIGNAL PROCESSOR | US15570986 | 2016-07-12 | US20180224487A1 | 2018-08-09 | Yukihiro TADOKORO; Hiroya TANAKA |
| To realize a compact device that detects phase or controls phase or an amplitude with high sensitivity, a signal controller includes: a linear conductor having a first end fixed to a negative electrode and a second end serving as a free end; a positive electrode facing the free end with a small gap therebetween; a first signal source that applies a voltage between the negative electrode and the positive electrode, the voltage applied being variable; a driving electrode that applies an electric field to a space around the conductor, the electric field having a component perpendicular to the lengthwise direction of the conductor; and a second signal source that applies an AC signal to the driving electrode. The signal processor can be a device for controlling or modulating phase or amplitude. | ||||||
| 73 | Systems and methods for providing modulation of switchmode RF power amplifiers | US15210131 | 2016-07-14 | US09614478B2 | 2017-04-04 | Regis J. Nero, Jr.; Jeffrey A. Gibala |
| Systems and methods are provided for generating an amplitude modulation signal to a switchmode power amplifier. A DC to DC switch is configured to receive a DC input voltage and to provide a DC output voltage. A low dropout regulator is configured to provide the amplitude modulation signal according to a modulation control signal received by the low dropout regulator. A control circuit is configured to establish a nominal operating power level for the power amplifier via the amplitude modulation signal and to maintain a minimum voltage difference between the DC output voltage and the low dropout regulator output. A modulator control circuit is configured to provide the modulation control signal to the low dropout regulator. The modulator control circuit provides the transition from a high amplitude to a low amplitude and a transition from the low amplitude to the high amplitude at configurable first and second slopes, respectively. | ||||||
| 74 | Systems and Methods for Providing Modulation of Switchmode RF Power Amplifiers | US15210131 | 2016-07-14 | US20160322941A1 | 2016-11-03 | Regis J. Nero, JR.; Jeffrey A. Gibala |
| Systems and methods are provided for generating an amplitude modulation signal to a switchmode power amplifier. A DC to DC switch is configured to receive a DC input voltage and to provide a DC output voltage. A low dropout regulator is configured to provide the amplitude modulation signal according to a modulation control signal received by the low dropout regulator. A control circuit is configured to establish a nominal operating power level for the power amplifier via the amplitude modulation signal and to maintain a minimum voltage difference between the DC output voltage and the low dropout regulator output. A modulator control circuit is configured to provide the modulation control signal to the low dropout regulator. The modulator control circuit provides the transition from a high amplitude to a low amplitude and a transition from the low amplitude to the high amplitude at configurable first and second slopes, respectively. | ||||||
| 75 | Systems and Methods for Providing Modulation of Switchmode RF Power Amplifiers | US14692293 | 2015-04-21 | US20150280649A1 | 2015-10-01 | Regis J Nero, JR.; Jeffrey A Gibala |
| Systems and methods are provided for generating an amplitude modulation signal to a switchmode power amplifier. A DC to DC switch is configured to receive a DC input voltage and to provide a DC output voltage. A low dropout regulator is configured to provide the amplitude modulation signal according to a modulation control signal received by the low dropout regulator. A control circuit is configured to establish a nominal operating power level for the power amplifier via the amplitude modulation signal and to maintain a minimum voltage difference between the DC output voltage and the low dropout regulator output. A modulator control circuit is configured to provide the modulation control signal to the low dropout regulator. The modulator control circuit provides the transition from a high amplitude to a low amplitude and a transition from the low amplitude to the high amplitude at configurable first and second slopes, respectively. | ||||||
| 76 | Synthesizer for transmitter and digital amplitude modulator | US14196652 | 2014-03-04 | US09072175B2 | 2015-06-30 | Yoshihiko Takahashi; Yuuki Funahashi |
| According to one embodiment, a synthesizer for a transmitter includes a transformer, a plurality of core support units and a fixing member. The plurality of core support units includes a support plate, fixing unit and an insertion. The support plate supports a toroidal core around which the primary winding is wound. The fixing unit fixes the toroidal core to the support plate. The insertion portion is formed inside or around the toroidal core and into which the secondary winding is inserted. The fixing member includes a plurality of receiving portions to and from which the plurality of core support units are attached and detached. The plurality of receiving portions are formed along a direction in which the plurality of core support units are stacked. | ||||||
| 77 | Systems and methods for providing modulation of switchmode RF power amplifiers | US12961089 | 2010-12-06 | US09041479B2 | 2015-05-26 | Regis J. Nero, Jr.; Jeffrey A. Gibala |
| Systems and methods are provided for generating an amplitude modulation signal to a switchmode power amplifier. A DC to DC switch is configured to receive a DC input voltage and to provide a DC output voltage. A low dropout regulator is configured to provide the amplitude modulation signal according to a modulation control signal received by the low dropout regulator. A control circuit is configured to establish a nominal operating power level for the power amplifier via the amplitude modulation signal and to maintain a minimum voltage difference between the DC output voltage and the low dropout regulator output. A modulator control circuit is configured to provide the modulation control signal to the low dropout regulator. The modulator control circuit provides the transition from a high amplitude to a low amplitude and a transition from the low amplitude to the high amplitude at configurable first and second slopes, respectively. | ||||||
| 78 | Amplitude modulator | US13380687 | 2010-04-08 | US08433267B2 | 2013-04-30 | Masakatsu Maeda; Taichi Ikedo |
| An amplitude modulator comprises: a signal processing section for receiving a source signal for wide bandwidth use, splitting the source signal into two source signals for lower frequency use and for higher frequency use, respectively, signal processing the two source signals individually, and outputting a lower-frequency-use source signal and a higher-frequency-use source signal; a first modulation section for modulating the lower-frequency-use source signal and outputting a lower-frequency-use modulation signal; a second modulation section for modulating the higher-frequency-use source signal and outputting a higher-frequency-use modulation signal; a synthesis output section for inputting the lower-frequency-use modulation signal to a first input terminal, the input thereof causing extraction of only a lower-frequency component, for inputting the higher-frequency-use modulation signal to a second input terminal, the input thereof causing extraction of only a higher-frequency component, for synthesizing the higher-frequency component and the lower-frequency component, and for outputting a modulated signal corresponding to the source signal for wide bandwidth use, to a next step. | ||||||
| 79 | Systems and Methods for Providing Modulation of Switchmode RF Power Amplifiers | US12961089 | 2010-12-06 | US20120139706A1 | 2012-06-07 | Regis J. Nero, JR.; Jeffrey A. Gibala |
| Systems and methods are provided for generating an amplitude modulation signal to a switchmode power amplifier. A DC to DC switch is configured to receive a DC input voltage and to provide a DC output voltage. A low dropout regulator is configured to provide the amplitude modulation signal according to a modulation control signal received by the low dropout regulator. A control circuit is configured to establish a nominal operating power level for the power amplifier via the amplitude modulation signal and to maintain a minimum voltage difference between the DC output voltage and the low dropout regulator output. A modulator control circuit is configured to provide the modulation control signal to the low dropout regulator. The modulator control circuit provides the transition from a high amplitude to a low amplitude and a transition from the low amplitude to the high amplitude at configurable first and second slopes, respectively. | ||||||
| 80 | Digital modulation circuit | US11847761 | 2007-08-30 | US07586293B2 | 2009-09-08 | Man Suk Seo; Hyung Cheol Park; Seong Soo Lee; Sang Yub Lee; Chang Soo Yang; Wan Cheol Yang |
| Provided is a digital modulation circuit constructed with only a digital circuit. The digital modulation circuit includes: a clock generator which generates a reference clock pulse having a predetermined period; an up/down counter which generates a count value having predetermined bits by up-counting or down-counting the reference clock pulse and outputs a bit in the count value as a transmission signal; a controller which determines a counting start/end time point of the up/down counter and determine which one of the up-counting operation and the down-counting operation of the up/down counter is to be performed, according to a value of digital transmission data that is to be transmitted; and a band-pass filter which converts a waveform of the transmission signal output from the up/down counter into a sine waveform. | ||||||
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