公开(公告)号：US10205622B2

公开(公告)日：2019-02-12

申请号：US15037205

申请日：2013-12-13

Applicant: Clairvoyant Technology LLC

Inventor： Thomas Frederick

IPC: H04L27/36 ,  H04W4/80 ,  H04L27/04 ,  H04L27/06 ,  H04B5/00 ,  H04L27/18 ,  H04L12/26 ,  G06K7/10 ,  H04W4/35 ,  H03C5/00 ,  H03F1/32 ,  G06K19/07 ,  H04B1/04 ,  H03C1/00 ,  H04B1/59

Abstract: A waveform synthesis technique for radio frequency identification (RFID) transmitters and an RFID system making us of the technique are disclosed. The RFID transmitter in example embodiments synthesizes a continuous transmitter waveform from a symbol alphabet without Nyquist or interpolation filters. High spectral occupancy waveforms are achieved which include the ability to do both linear and nonlinear predistortion with no increase in computational load once the signal set has been adapted to compensate for linear and nonlinear distortion in the transmitter analog circuitry. A polarity generator can be used to impart the required polarity to each waveform. The RFID transmitter can be employed in RFID readers to reduce the computational requirements of the digital signal processor (DSP).

公开(公告)号：US09401702B2

公开(公告)日：2016-07-26

申请号：US14250880

申请日：2014-04-11

Applicant: Texas Instruments Incorporated

Inventor： Aswin Srinivasa Rao ,  Anand Kudari ,  Karthik Subburaj

IPC: H03C1/00 ,  H03K7/06 ,  H04L27/12 ,  H04L27/10

CPC classification number: H03K7/06 ,  H04L27/10 ,  H04L27/12 ,  H04L27/127

Abstract: Binary frequency shift keying modulation is implemented by choosing appropriate phases of a high frequency clock to generate a modulated intermediate clock frequency. The high frequency clock is chosen to be (M+0.5)*fc, where fc is the carrier frequency and M is an integer. Depending on the binary data ‘1’ or ‘0’ to be transmitted, ‘M’ or ‘M+1’ clock phases from the high frequency clock are converted to an intermediate clock that is 2*N times faster than the carrier frequency, where N is an integer. This intermediate clock, generated entirely in the digital domain, has the required data modulation in it, and is used to generate N pulse width modulated (PWM) phases of waveforms operating at the carrier frequency. The N phases are then weighed appropriately to synthesize a sine waveform whose lower harmonics are substantially suppressed.

Abstract translation: 通过选择高频时钟的适当相位来产生调制的中间时钟频率来实现二进制频移键控调制。 高频时钟选择为（M + 0.5）* fc，其中fc是载波频率，M是整数。 根据要发送的二进制数据'1'或'0'，来自高频时钟的“M”或“M + 1”个时钟相位被转换为比载波频率快2倍N倍的中间时钟， 其中N是整数。 该完全在数字域中产生的中间时钟在其中具有所需的数据调制，并用于产生以载波频率工作的N个脉宽调制（PWM）相位。 然后适当地称重N相，以合成基本上抑制其低次谐波的正弦波形。

公开(公告)号：US09369102B2

公开(公告)日：2016-06-14

申请号：US14808705

申请日：2015-07-24

Applicant: Oticon A/S

Inventor： Niels Henrik Pontoppidan ,  Thomas Lunner ,  Marianna Vatti ,  Lars Bramsløw

IPC: H03G5/00 ,  H03G3/00 ,  H04R25/00 ,  H03C1/00 ,  H03C5/00 ,  H03C3/40 ,  G10L21/02 ,  G10L21/0364

CPC classification number: H03G3/00 ,  G10L21/0205 ,  G10L21/0364 ,  H03C1/00 ,  H03C3/40 ,  H03C5/00 ,  H04R25/353 ,  H04R25/356 ,  H04R25/43 ,  H04R2225/43

Abstract: A method for processing an audio signal (i(t)), comprises: receiving a first set (x(t)) of time-varying signals representing a first sound comprised in the audio signal (i(t)), the first set (x(t)) of time-varying signals comprising an amplitude modulation signal (a(t)), a carrier frequency signal (fc(t)), a pitch signal (f0(t)) and an FM index signal (h(t)); and modifying the first set (x(t)) of time-varying signals by modifying the amplitude of the FM index signal (h(t)), thereby providing a first modified set (x′(t)) of time-varying signals. The resulting first modified set (x′(t)) of time-varying signals may subsequently be modulated to provide an audio output signal.

公开(公告)号：US09035711B2

公开(公告)日：2015-05-19

申请号：US13422624

申请日：2012-03-16

Applicant: Chun-Liang Tsai ,  Shao-Chang Chang

Inventor： Chun-Liang Tsai ,  Shao-Chang Chang

IPC: H03C1/62 ,  H03C1/00 ,  H04L27/04 ,  H03K7/02 ,  G06K19/07

CPC classification number: H03C1/62 ,  G06K19/0723 ,  H03C1/00 ,  H03C1/14 ,  H03K7/02 ,  H04L27/04

Abstract: A modulator which has a first terminal to receive a carrier signal, a second terminal to receive a first control signal to control a frequency band of the carrier signal and a third terminal to receive a second control signal to control a modulation depth of the carrier signal.

Abstract translation: 一种具有接收载波信号的第一端子的调制器，用于接收第一控制信号以控制载波信号的频带的第二端子和用于接收第二控制信号以控制载波信号的调制深度的第三端子 。

公开(公告)号：US08860524B2

公开(公告)日：2014-10-14

申请号：US13382029

申请日：2010-06-17

Applicant: Shigeru Morimoto ,  Kaoru Ishida ,  Maki Nakamura

Inventor： Shigeru Morimoto ,  Kaoru Ishida ,  Maki Nakamura

IPC: H03C1/00 ,  H03F3/24 ,  H03F3/189 ,  H03C5/00 ,  H03F1/02 ,  H04B1/04

CPC classification number: H03F3/24 ,  H03C5/00 ,  H03F1/0266 ,  H03F3/189 ,  H04B1/04

Abstract: A polar modulator of the present invention includes: a first function block which generates an amplitude signal and a phase signal; a second function block which adjusts the signal delay between the amplitude signal and the phase signal; a third function block which allows the low frequency component of the amplitude signal to pass therethrough; a fourth function block which modulates the phase of the phase signal; a fifth function block which outputs a modulation voltage, based on the amplitude signal; a sixth function block which modulates the amplitude of the phase signal, based on the modulation voltage; a seventh function block which measures the temperature of at least one function block; and an eighth function block which calculates a compensation amount for the signal delay, based on the measured temperature. The second function block adjusts the signal delay, based on the compensation amount.

Abstract translation: 本发明的极性调制器包括：产生振幅信号和相位信号的第一功能块; 第二功能块，调整幅度信号和相位信号之间的信号延迟; 允许振幅信号的低频分量通过的第三功能块; 第四功能块，其对相位信号的相位进行调制; 第五功能块，其基于所述振幅信号输出调制电压; 第六功能块，其基于所述调制电压来调制所述相位信号的幅度; 测量至少一个功能块的温度的第七功能块; 以及基于测量的温度计算信号延迟的补偿量的第八功能块。 第二功能块根据补偿量调整信号延迟。

公开(公告)号：US08704607B2

公开(公告)日：2014-04-22

申请号：US12781431

申请日：2010-05-17

Applicant: Itsuo Yuzurihara ,  Yoshihisa Hata

Inventor： Itsuo Yuzurihara ,  Yoshihisa Hata

IPC: H03C1/00

CPC classification number: H01J37/32183 ,  H01J37/32082 ,  H02M7/48 ,  H02M2001/007 ,  H03F3/191 ,  H03F3/217 ,  H03K7/08 ,  H03K7/10

Abstract: The pulse modulated RF power control method includes an output amplitude control step for controlling amplitude of a pulse output, and a duty control step for controlling a duty ratio of the pulse output. The output amplitude control step performs a constant amplitude control to control an amplitude value of the pulse output so that the amplitude value becomes equal to a set amplitude value. The constant amplitude control according to the output amplitude control, for instance, gives a feedback of the amplitude value of the pulse output outputted by the power control, obtains a difference value between the feedback value and the set amplitude value, and controls the amplitude value of the pulse output so that the difference value becomes zero.

Abstract translation: 脉冲调制RF功率控制方法包括用于控制脉冲输出的幅度的输出幅度控制步骤和用于控制脉冲输出的占空比的占空比控制步骤。 输出幅度控制步骤执行恒定幅度控制以控制脉冲输出的幅度值，使得振幅值变得等于设定的振幅值。 例如，根据输出幅度控制的恒定幅度控制给出由功率控制输出的脉冲输出的振幅值的反馈，获得反馈值和设定振幅值之间的差值，并且控制振幅值 的脉冲输出，使得差值变为零。

公开(公告)号：US20130162363A1

公开(公告)日：2013-06-27

申请号：US13400129

申请日：2012-02-20

Applicant: Peng Han ,  Dawei Guo ,  Jiazhou Liu ,  Yanfeng Wang

Inventor： Peng Han ,  Dawei Guo ,  Jiazhou Liu ,  Yanfeng Wang

IPC: H03C1/00 ,  G06G7/12

CPC classification number: H03C1/36 ,  H03D7/1441 ,  H03D7/1458 ,  H03D7/1491 ,  H03D2200/0033 ,  H03D2200/0052 ,  H04L27/04

Abstract: An ASK modulator includes a baseband unit which obtains a sequence comprising at least one amplitude value and adds an additional value to each of the at least one amplitude value to generate a modified sequence; a digital-to-analog converter coupled to the baseband unit, the digital-to-analog converter converts the modified sequence to generate a first signal, the additional value is determined based on a half scale of the digital-analog converter; and a mixer which receives the first signal and a second signal and generate a modulated signal by mixing the first signal with the second signal.

Abstract translation: ASK调制器包括：基带单元，其获得包括至少一个幅度值的序列，并且对所述至少一个幅度值中的每一个增加附加值以生成修改的序列; 耦合到所述基带单元的数模转换器，所述数模转换器转换所述经修改的序列以产生第一信号，所述附加值基于所述数模转换器的半标度来确定; 以及混合器，其接收第一信号和第二信号，并通过将第一信号与第二信号混合来产生调制信号。

公开(公告)号：US07932791B2

公开(公告)日：2011-04-26

申请号：US12346222

申请日：2008-12-30

Applicant: Chi-En Liu ,  Jean-Fu Kiang

Inventor： Chi-En Liu ,  Jean-Fu Kiang

IPC: H03C1/00

CPC classification number: G06G7/12 ,  H03F3/245 ,  H03F3/45183 ,  H03F3/60 ,  H03F2200/255 ,  H03F2200/423

Abstract: A signal modulation device and a signal amplifier cooperative therewith. The signal modulation device includes a local oscillation signal source, a baseband signal source, a first NMOS transistor, and a second NMOS transistor, wherein the first and second NMOS transistors are coupled with the baseband signal source and form a circuit architecture of a Gilbert-cell based differential pair to be directly switched by a differential baseband signal, and a high-frequency signal from the local oscillation signal source is controlled by the baseband signal so as to generate an amplitude-modulation high-frequency signal at an output end. The single-stage signal power amplifier amplifies the amplitude-modulation signal from the preceding circuit so as to increase the magnitude of signals transmitted and simplify the preceding digital/analog signal conversion circuit in a conventional amplitude-modulation circuit.

Abstract translation: 信号调制装置和信号放大器。 信号调制装置包括本地振荡信号源，基带信号源，第一NMOS晶体管和第二NMOS晶体管，其中第一和第二NMOS晶体管与基带信号源耦合并形成吉尔伯特 - 基于差分基带信号直接切换的基于单元的差分对，并且来自本地振荡信号源的高频信号由基带信号控制，以便在输出端产生幅度调制高频信号。 单级信号功率放大器放大来自前一电路的幅度调制信号，以增加传输的信号的幅度，并简化了传统的幅度调制电路中的前一数字/模拟信号转换电路。

公开(公告)号：US20100321127A1

公开(公告)日：2010-12-23

申请号：US12918751

申请日：2009-02-20

Applicant: Daisuke Watanabe ,  Toshiyuki Okayasu

Inventor： Daisuke Watanabe ,  Toshiyuki Okayasu

IPC: H03C1/00 ,  G06F19/00 ,  H03D1/00

CPC classification number: H04L27/34 ,  G01R31/31924 ,  H04L25/4917 ,  H04L27/362 ,  H04L27/38

Abstract: A test apparatus includes digital modulators provided in increments of multiple channels. A baseband signal generator performs retiming of data input as a modulation signal for the in-phase (quadrature) component, using a timing signal the timing of which can be adjusted, thereby generating a baseband signal. A driver generates a multi-value digital signal having a level that corresponds to the baseband signal output from the baseband signal generator. A multiplier amplitude-modulates a carrier signal with the multi-value digital signal. An adder sums the output signals of the multipliers.

Abstract translation: 测试装置包括以多个通道为增量提供的数字调制器。 基带信号发生器使用可以调整定时信号的定时信号来执行数据输入的重新定时作为同相（正交）分量的调制信号，从而生成基带信号。 驱动器产生具有与从基带信号发生器输出的基带信号对应的电平的多值数字信号。 乘法器用多值数字信号对载波信号进行幅度调制。 加法器对乘法器的输出信号求和。

公开(公告)号：US20090267738A1

公开(公告)日：2009-10-29

申请号：US12346621

申请日：2008-12-30

Applicant: Chi-En Liu ,  Jean-Fu Kiang

Inventor： Chi-En Liu ,  Jean-Fu Kiang

IPC: H04Q5/22 ,  H03C1/00

CPC classification number: H04Q9/00 ,  H03B5/1215 ,  H03B5/1231 ,  H03B5/1243 ,  H03B2200/0074 ,  H03D3/24 ,  H03D7/12 ,  H03D2200/0005 ,  H04Q2209/47

Abstract: A signal conversion device, a radio frequency identification (RFID) tag, and a method for operating the RFID tag. The RFID tag has an electrically erasable programmable read-only memory module for storing RFID tag information and transmitting the RFID tag information; an information comparison module coupled to the electrically erasable programmable for receiving the RFID tag information and demodulation information, comparing the RFID tag information with the demodulation information, and generating a driving signal; and a pulse oscillation module coupled to the information comparison module for receiving the driving signal, and transmitting pulse oscillating signals to the electrically erasable programmable read-only memory module, so as to allow the electrically erasable programmable read-only memory module to transmit the RFID tag information.

Abstract translation: 信号转换装置，射频识别（RFID）标签和操作RFID​​标签的方法。 RFID标签具有用于存储RFID标签信息并发送RFID标签信息的电可擦除可编程只读存储器模块; 耦合到电可擦除可编程序器的信息比较模块，用于接收RFID标签信息和解调信息，将RFID标签信息与解调信息进行比较，并产生驱动信号; 以及脉冲振荡模块，其耦合到信息比较模块，用于接收驱动信号，并将脉冲振荡信号发送到电可擦除可编程只读存储器模块，以便允许电可擦除可编程只读存储器模块传输RFID 标签信息。