公开(公告)号：US11716065B2

公开(公告)日：2023-08-01

申请号：US17096689

申请日：2020-11-12

Applicant: Sonos, Inc.

Inventor： Aurelio Ramos

IPC: H03G3/00 ,  H03G11/00 ,  H04R3/00 ,  H03G3/30 ,  H03G9/02 ,  H03G7/00 ,  H04R1/00 ,  H04H40/54

CPC classification number: H03G11/00 ,  H03G3/3005 ,  H03G7/002 ,  H03G9/025 ,  H04R3/007 ,  H03G2201/103 ,  H04R2430/01

Abstract: Systems and methods for limiting volume in an audio playback device using a feedback controller are disclosed herein. In one example, a gain stage modulates gain of an audio signal based in part on feedback from a downstream limiter. The gain stage receives a first audio signal as well as a feedback signal from the feedback controller. Based at least in part on the feedback signal from the feedback controller, the gain stage modulates a gain of the first audio signal to provide a second audio signal. The second audio signal is delivered to the limiter, which limits the second audio signal to produce an output signal. The output signal is played back via a transducer. The feedback controller receives a gain reduction value from the limiter and determines a feedback signal to provide to the gain stage upstream of the limiter.

公开(公告)号：US20230197410A1

公开(公告)日：2023-06-22

申请号：US18171829

申请日：2023-02-21

Applicant: Analogic Corporation

Inventor： Ahmed A. Hussein

IPC: H01J37/32 ,  H03F3/24 ,  H03G3/30 ,  H03M1/66

CPC classification number: H01J37/32146 ,  H03F3/245 ,  H03G3/3042 ,  H03M1/66 ,  H03G2201/307 ,  H03F2200/451 ,  H03G2201/103

Abstract: One or more example relate, generally, to generating radio frequency (RF) signals. An apparatus may include a signal generator, an amplification stage, and a feedback control loop. The signal generator may generate a pulsed radio frequency (RF) signal at least partially responsive to a digital pulsed waveform defined by one or more commands. The amplification stage may amplify the pulsed RF signal. The feedback control loop may be coupled to the amplification stage to regulate a power level of respective steps of the pulsed RF signal.

公开(公告)号：US20230155560A1

公开(公告)日：2023-05-18

申请号：US17919784

申请日：2021-04-21

Applicant: ZTE CORPORATION

Inventor： Song CHEN ,  Jie LIN ,  Hao CHEN

IPC: H03G3/30

CPC classification number: H03G3/3036 ,  H03G2201/103 ,  H03G2201/307

Abstract: Provided are automatic level control (ALC) circuit, signal source, method for controlling signal source output power, and storage medium. The ALC circuit includes: at least two stages of ALC loops, each ALC loop including an amplifier, a coupler, a power detector, and an attenuation control module connected sequentially. An output end of an adjustable attenuator is connected to an input node of first stage of ALC loop; an output node of each stage of ALC loop, other than last stage of ALC loop, is connected to a normally on end of a two-way single-on switch, a first gating end of the two-way single-on switch is connected to an input node of a next stage of ALC loop, and the output node of the last stage of ALC loop and a second gating end of each two-way single-on switch are connected to an output end of the ALC circuit.

公开(公告)号：US20190081605A1

公开(公告)日：2019-03-14

申请号：US16111555

申请日：2018-08-24

Applicant: JVC KENWOOD CORPORATION

Inventor： Hideaki SHIOZAWA

IPC: H03G3/34 ,  H04B1/10 ,  H03G3/30 ,  H03F3/183

CPC classification number: H03G3/344 ,  H03F3/181 ,  H03F3/183 ,  H03F2200/03 ,  H03F2200/372 ,  H03G3/3005 ,  H03G2201/103 ,  H04B1/1027

Abstract: A noise squelch processor generates a noise squelch determination signal by comparing a noise level and a threshold value with each other. A carrier detector generates a carrier determination signal indicating whether or not a reception signal is present based on a signal strength of the reception signal. An integrator controller controls an integrator to set a cutoff frequency of the integrator to a second cutoff frequency higher than a first cutoff frequency at a first timing when the carrier detector generates a carrier determination signal indicating that the reception signal is present, and to switch the cutoff frequency of the integrator from the second cutoff frequency to the first cutoff frequency at a second timing after an elapse of a predetermined period from the first timing.

公开(公告)号：US20180321904A1

公开(公告)日：2018-11-08

申请号：US16034717

申请日：2018-07-13

Applicant: iZotope, Inc.

Inventor： Jonathan Bailey ,  Todd Baker ,  Brett Bunting ,  Mark Ethier ,  Matt Fuerch

IPC: G06F3/16 ,  G10L19/00

CPC classification number: G06F3/167 ,  G06F3/0482 ,  G06F3/04847 ,  G06F3/04883 ,  G06F3/165 ,  G10H2210/056 ,  G10L19/00 ,  G11B27/34 ,  H03F3/183 ,  H03F2200/03 ,  H03G3/3005 ,  H03G3/301 ,  H03G3/3089 ,  H03G5/005 ,  H03G5/165 ,  H03G7/002 ,  H03G7/007 ,  H03G9/005 ,  H03G2201/103 ,  H04B1/034 ,  H04Q3/64

Abstract: Some embodiments of the invention are directed to an audio production system which is more portable, less expensive, faster to set up, and simpler and easier to use than conventional audio production tools. An audio production system implemented in accordance with some embodiments of the invention may therefore be more accessible to the typical user, and easier and more enjoyable to use, than conventional audio production tools.

公开(公告)号：US20180138878A1

公开(公告)日：2018-05-17

申请号：US15808341

申请日：2017-11-09

Applicant: SKYWORKS SOLUTIONS, INC.

Inventor： William J. Domino ,  Thomas Obkircher ,  Adrian John Bergsma ,  Peihua Ye

IPC: H03G3/30 ,  H03F1/56 ,  H03F1/02 ,  H03F3/195

CPC classification number: H03G3/30 ,  H03F1/0205 ,  H03F1/56 ,  H03F3/195 ,  H03F3/45475 ,  H03F2200/09 ,  H03F2200/294 ,  H03F2200/387 ,  H03F2200/451 ,  H03G1/0088 ,  H03G3/3042 ,  H03G2201/103 ,  H03G2201/106

Abstract: Amplifier systems and methods are provided that include a fixed gain amplification stage coupled to an adjustable attenuation stage further coupled to a variable gain amplification stage. A controller controls an amount of attenuation provided by the adjustable attenuation stage and an amount of gain provided by the variable gain amplification stage to maintain any of various noise, efficiency, and/or linearity requirements of the amplifier system.

公开(公告)号：US09716521B2

公开(公告)日：2017-07-25

申请号：US14825141

申请日：2015-08-12

Applicant: Telefonaktiebolaget L M Ericsson (publ)

Inventor： Peter Alriksson ,  Joakim Axmon

IPC: H04B1/12 ,  H03G3/30 ,  H04W52/52

CPC classification number: H04B1/123 ,  H03G3/3078 ,  H03G2201/103 ,  H03G2201/702 ,  H04W52/52

Abstract: The gain of an amplifier in a receiver operating in a cellular communication system is controlled by determining one or more gain variability metrics, which are then used to produce first and second threshold values. A frequency difference between a current carrier frequency and a target carrier frequency is ascertained and then compared to the threshold values. Target gain setting production is based on comparison results: If the frequency difference is larger than the first threshold, a full automatic gain control algorithm is performed; if the frequency difference is smaller than the first threshold and larger than the second threshold, an optimized automatic gain control algorithm is performed, wherein the optimized automatic gain control algorithm uses a current gain setting as a starting point; and if the frequency difference is smaller than both the first and second thresholds, the current gain setting is used as the target gain setting.

公开(公告)号：US08244193B2

公开(公告)日：2012-08-14

申请号：US12348450

申请日：2009-01-05

Applicant: Meng-An Pan

Inventor： Meng-An Pan

IPC: H01Q11/12 ,  H04K3/00

CPC classification number: H04B1/0003 ,  H03F1/0261 ,  H03F3/45188 ,  H03G3/3042 ,  H03G2201/103 ,  H03G2201/202 ,  H03G2201/307 ,  H03G2201/40 ,  H04B1/0475

Abstract: A transmitter includes a dual mode modulator and an amplifier coupled to the dual mode modulator. The dual mode modulator implements a linear modulation scheme during a first mode of the modulator to produce a variable envelope modulated signal. The dual mode modulator implements a non-linear modulation scheme during a second mode of the modulator to produce a constant envelope modulated signal. The amplifier is biased as a linear amplifier during the first mode of the modulator and is biased as a non-linear amplifier during the second mode of the modulator. A feed-forward connection between the dual mode modulator and the amplifier is used to indicate a change in modulation mode and to adjust the bias of the amplifier. A power of the constant envelope modulated signal is increased such that an operating point of the amplifier remains substantially constant during the first and second modes of the modulator.

Abstract translation: 发射机包括耦合到双模调制器的双模调制器和放大器。 双模式调制器在调制器的第一模式期间实现线性调制方案，以产生可变包络调制信号。 双模式调制器在调制器的第二模式期间实现非线性调制方案，以产生恒定的包络调制信号。 放大器在调制器的第一模式期间被偏置为线性放大器，并且在调制器的第二模式期间被偏置为非线性放大器。 双模式调制器和放大器之间的前馈连接用于指示调制模式的变化并调整放大器的偏置。 恒定包络调制信号的功率增加，使得放大器的工作点在调制器的第一和第二模式期间保持基本恒定。

公开(公告)号：US07629851B2

公开(公告)日：2009-12-08

申请号：US12234833

申请日：2008-09-22

Applicant: Hirokazu Tsurumaki ,  Hiroyuki Nagai ,  Tomio Furuya ,  Makoto Ishikawa

Inventor： Hirokazu Tsurumaki ,  Hiroyuki Nagai ,  Tomio Furuya ,  Makoto Ishikawa

IPC: H03G3/10

CPC classification number: H03G1/0005 ,  H03F1/301 ,  H03F2200/294 ,  H03F2200/372 ,  H03G2201/103 ,  H03G2201/206 ,  H03G2201/307 ,  H03G2201/40

Abstract: In a high frequency power amplifier circuit that supplies a bias to an amplifying FET by a current mirror method, scattering of a threshold voltage Vth due to the scattering of the channel impurity concentration of the FET, and a shift of a bias point caused by the scattering of the threshold voltage Vth and a channel length modulation coefficient λ due to a short channel effect are corrected automatically. The scattering of a high frequency power amplifying characteristic can be reduced as a result.

Abstract translation: 在通过电流镜法向放大FET提供偏置的高频功率放大器电路中，由于FET的沟道杂质浓度的散射引起的阈值电压Vth的散射和由 自动校正阈值电压Vth的散射和由于短通道效应引起的通道长度调制系数λ。 结果可以降低高频功率放大特性的散射。

公开(公告)号：US07598479B2

公开(公告)日：2009-10-06

申请号：US10566240

申请日：2003-07-30

Applicant: Masamichi Nogami ,  Masaki Noda ,  Hitoyuki Tagami ,  Kuniaki Motoshima

Inventor： Masamichi Nogami ,  Masaki Noda ,  Hitoyuki Tagami ,  Kuniaki Motoshima

IPC: H03F3/08

CPC classification number: H03G3/3084 ,  H03F3/08 ,  H03G1/0047 ,  H03G2201/103 ,  H03G2201/502 ,  H04B10/69

Abstract: A gain switching circuit switches a conversion gain of a preamplifier that is configured with a series circuit formed with a first resistor and a first switching element and a series circuit formed with a second resistor and a second switching element respectively connected in parallel with a feedback resistor. The gain switching circuit includes a first operating unit that generates a first switching element operating signal for closing the first switching element within a first gain switching period, and a second operating unit that generates a second switching element operating signal for closing the second switching element within a second gain switching period.

Abstract translation: 增益切换电路切换配置有由第一电阻器和第一开关元件形成的串联电路的前置放大器的转换增益，以及与分别与反馈电阻并联连接的第二电阻器和第二开关元件形成的串联电路 。 增益切换电路包括第一操作单元，其在第一增益切换周期内产生用于闭合第一开关元件的第一开关元件操作信号，以及第二操作单元，其产生用于闭合第二开关元件的第二开关元件操作信号 第二增益切换周期。