公开(公告)号：EP3286837A1

公开(公告)日：2018-02-28

申请号：EP16724458

申请日：2016-04-04

申请人： CIRRUS LOGIC INT SEMICONDUCTOR LTD

发明人： MORTAZAVI YOUSOF ,  MELANSON JOHN L ,  ZANBACHI RAMIN ,  BRENNAN AARON

IPC分类号： H03M1/18 ,  G10L25/78

CPC分类号： G10L25/78 ,  G10L15/22 ,  G10L15/28 ,  G10L15/34 ,  G10L21/034 ,  G10L2015/223 ,  H03M1/185 ,  H03M3/49

摘要： The dynamic range and power efficiency of a voice-activated system may be improved by dynamically adjusting the configuration of the voice-activated system's input path. In one embodiment, a first portion of audio may be received through an input path of the voice-activated system having a first configuration. A characteristic of the first portion of audio may be determined and the input path may be adjusted to a second configuration based on the determined characteristic. A second portion of audio may then be received through the input path having the second configuration, and speech analysis may be performed on the second portion of audio.

公开(公告)号：EP2756599A1

公开(公告)日：2014-07-23

申请号：EP12743922.2

申请日：2012-07-17

申请人： Robert Bosch GmbH

发明人： KARL, Matthias

IPC分类号： H03M1/18 ,  G01S13/93 ,  G01S15/93 ,  G01S7/529

CPC分类号： H03M1/001 ,  G01N27/00 ,  G01S7/529 ,  G01S13/931 ,  G01S15/931 ,  G01V9/00 ,  H02M5/42 ,  H03M1/182 ,  H03M1/185

摘要： The present invention relates to a method for amplifying an echo signal, wherein an analogue echo signal suitable for vehicle environment detection is amplified by means of an amplification based on the runtime of the echo signal, wherein the analogue echo signal is amplified by means of an amplifier having a plurality of outputs, each with different amplification and a downstream A/D converter with a time-variable reference voltage. At the same time, switching occurs between the different outputs of the amplifier at predefined switchover times and the reference voltage of the A/D converter varies time-wise between the switching times in such a manner that at the output of the A/D converter the echo signal is present with a runtime-dependent overall amplification, which has a predefined profile.

公开(公告)号：EP2512034A1

公开(公告)日：2012-10-17

申请号：EP12163967.8

申请日：2012-04-12

申请人： Thales

发明人： Martin, Nicolas ,  Perre, Jean-Michel ,  Depraz, David

IPC分类号： H03M1/18

CPC分类号： H03M1/18 ,  H03M1/185

摘要： L'invention a pour objet un système de conversion analogique-numérique comprenant au moins un amplificateur à gain variable (400, 600) amplifiant un signal d'entrée e, un convertisseur analogique-numérique CAN (401, 601) numérisant ledit signal e, un module de traitement numérique anti-interférence (407, 602) du signal numérisé. Il comprend aussi une première boucle de contrôle automatique de gain CAG (402, 604) dite boucle CAG analogique comparant une estimation (403) de la puissance en sortie du convertisseur CAN (401, 601) avec une consigne de commande g1 appelée consigne de commande de la boucle CAG analogique, un gain ga utilisé pour contrôler l'amplificateur à gain variable (400, 600) étant déduit de cette comparaison. Il comprend en outre une seconde boucle de contrôle automatique de gain CAG (420, 605) dite boucle numérique, ladite boucle numérique comparant (423) une estimation (421) de la puissance après le traitement numérique anti-interférence (407, 602) avec une consigne de commande gn prédéterminée, la boucle CAG analogique (402, 604) étant contrôlée par une consigne de commande (402, 604, 804) déduite de cette comparaison.

摘要翻译： 该系统具有到模拟自适应增益控制环路（402）比较器，以在功率的估计（403）在与命令设定值（G1）控制器区域网络（CAN）（401）的输出。 模拟增益（GA）来控制可变增益放大器（400）被从所述比较推导出。 数字自适应增益控制环路（420）比较由设定值提供给估算的与抗干扰数字滤波器（407）的抗干扰数字处理之后的预设命令（GN）模块（421），功率估计。 模拟环路由来自所述比较推导出一个命令设定点控制。

公开(公告)号：EP1384314B1

公开(公告)日：2012-01-25

申请号：EP02734120.5

申请日：2002-05-01

申请人： Panasonic Corporation of North America

发明人： TROEMEL, Hans, A., Jr.

IPC分类号： H03M1/18 ,  H03D3/00

CPC分类号： H03J3/08 ,  H03D3/007 ,  H03M1/185

摘要： An input signal (IN) is filtered (605) to remove aliases and a switched capacitor network (610) undersamples this signal to provide a downconverted, near-baseband signal. An amplifier (615) adjusts the amplitude of this signal to match a digitizer (620). The digitized output is converted into first phase and second phase signals which are then filtered (640) and decimated (645) to further reduce the sampling rate. The downconverted first an second phase signals, rather than higher frequency signals, control the gain function (AGC) for the amplifier (615). The switched capacitor network (610) provides for both tuning and downconversion of the desired signal to a lower frequency for further processing, thus reducing the frequency and power requirements of an associated amplifier and analog-to-digital converter (digitizer).

公开(公告)号：EP2163025A2

公开(公告)日：2010-03-17

申请号：EP08755615.5

申请日：2008-05-15

申请人： QUALCOMM Incorporated

发明人： BLACK, Peter J. ,  WU, Qiang ,  ZHAO, Wanlun ,  TOKGOZ, Yeliz ,  PADOVANI, Roberto ,  NAGUIB, Ayman Fawzy ,  KIM, Je Woo ,  AGASHE, Parag A. ,  BHUSHAN, Naga ,  DAYAL, Pranav

IPC分类号： H04L5/02

CPC分类号： H04W4/02 ,  H03M1/185 ,  H04L5/0023 ,  H04L5/0048 ,  H04L27/261 ,  H04L27/2613 ,  H04W16/02 ,  H04W64/00

摘要： Briefly, in accordance with one embodiment, a method of transmitting signals is provided. Signal waveforms are transmitted from at least two respective sectors. The at least two respective sectors are from at least two different sets of a superset of sectors. The transmitted signal waveforms include signal waveforms at least nearly mutually orthogonal at least along a particular signal dimension. An advantage of such an embodiment, for example, is reduced signal interference.

摘要翻译： 简而言之，根据一个实施例，提供一种发送信号的方法。 信号波形从至少两个相应扇区发送。 所述至少两个相应的扇区来自扇区的超集的至少两个不同的集合。 所发送的信号波形包括至少沿特定信号维度至少几乎相互正交的信号波形。 例如，这种实施例的优点是减少了信号干扰。

公开(公告)号：EP2005583A2

公开(公告)日：2008-12-24

申请号：EP07760135.9

申请日：2007-04-04

申请人： QUALCOMM Incorporated

发明人： KRISHNAMOORTHI, Raghuraman ,  MURTHY, Vinay

IPC分类号： H03G3/00 ,  H03G3/30

CPC分类号： H03G3/002 ,  H03G3/3089 ,  H03M1/185

摘要： Techniques for performing automatic gain control are described. In some aspects, the gain control is achieved with an apparatus having an analog-to-digital converter (ADC) and a digital variable gain amplifier (DVGA), the DVGA configured to receive a digital signal from the ADC, the DVGA having a processor configured to compute a gain using a base n logarithm based on the power of the digital signal output from the ADC, the processor being further configured to apply the gain to the digital signal.

公开(公告)号：EP1588517A1

公开(公告)日：2005-10-26

申请号：EP04707440.6

申请日：2004-02-02

申请人： QUALCOMM INCORPORATED

发明人： MONTOJO, Juan ,  SALVI, Rohan Sudhakar ,  BLACK, Peter J.

IPC分类号： H04L5/06

CPC分类号： H03G3/3078 ,  H03G3/3036 ,  H03M1/185 ,  H04L5/06 ,  H04L27/0002 ,  H04L27/28

摘要： A receiver operates to AGC a multi-carrier signal through a corresponding number of inner loops and an outer loop AGC processes. A first number of bits for representing the multi-carrier signal with a limited amount of interference is determined through a calibration mode process. The first number of bits provides for quantization of the multi-carrier signal at an outer loop AGC to a maximum quantization level. After the received signal power estimate is reached a predetermined 'ON' threshold, the outer loop AGC is operated at a second number of bits higher than the first number of bits to allow a quantization of possible interference in accordance with a difference of the first and second number of bits. The outer loop AGC switches back to use the first number of bits when the received signal power estimate falls below a predetermined 'OFF' threshold.

公开(公告)号：EP1038358B1

公开(公告)日：2004-10-20

申请号：EP98962093.5

申请日：1998-12-14

申请人： QUALCOMM INCORPORATED

发明人： HEIMBIGNER, Wade, L. ,  HUTCHISON, James, A., IV ,  OLIVEIRA, Louis, D.; c/o QUALCOMM Incorporated

IPC分类号： H03M1/18

CPC分类号： H03M1/185

摘要： An audio band processor and a method and circuit for controlling its gain. The audio band processor comprises a first variable gain amplifier (202) for receiving an analog audio signal; an analog to digital converter (204) for converting said analog audio signal to a digital audio signal; and an interface circuit (206) for encoding said digital audio signal. The interface circuit (206) also arranges said digital audio signal into a sequence of encoded transmit frames, and receives a sequence of encoded receive frames, each receive frame comprising a predetermined number of encoded digital audio signal data bits and a predetermined number of digital gain control bits. The interface circuit (206) also adjusts a gain level of said first variable gain amplifier in response to said digital gain control bits. In another embodiment, the audio band processor further comprises a second variable gain amplifier (202), and the interface circuit adjusts a gain level of said second variable gain amplifier in response to said digital gain control bits.

公开(公告)号：EP1296449A1

公开(公告)日：2003-03-26

申请号：EP01122979.6

申请日：2001-09-25

申请人： Sony International (Europe) GmbH ,  Sony Corporation

发明人： Wildhagen, Jens, Advanced Technology Ct. Stuttgart ,  Merkle, Carsten, Advanced Technology Ct. Stuttgart ,  Schill, Dietmar, Advanced Technology Ct. Stuttgart ,  Nöthlings, Rolf, Advanced Technology Ct. Stuttgart ,  Okanobu, Taiwa

IPC分类号： H03G3/30

CPC分类号： H03G3/001 ,  H03G3/3036 ,  H03M1/185

摘要： In an automatic gain control unit, the gain of a voltage-controlled amplifier (VCA) (25) is regulated with a closed-loop control circuit. The time constant of the control circuit is varied dependent on the magnitude (31) of the VCA output signal. As long as the magnitude (31) of the VCA output signal is small, the gain is slowly adjusted. In case the-magnitude (31) of the VCA becomes so large that saturation of the analog-digital converter (28) might occur, the time constant of the control circuit is decreased, in order to allow for a quick adjustment of the amplifier's gain.

摘要翻译： 在自动增益控制单元中，通过闭环控制电路调节压控放大器（VCA）（25）的增益。 控制电路的时间常数取决于VCA输出信号的幅度（31）而变化。 只要VCA输出信号的幅度（31）小，增益就缓慢调整。 在VCA的幅度（31）变得如此大以至可能发生模拟数字转换器（28）的饱和的情况下，控制电路的时间常数减小，以便允许快速调整放大器的增益 。

公开(公告)号：EP1214791A1

公开(公告)日：2002-06-19

申请号：EP00958509.2

申请日：2000-08-29

申请人： Telefonaktiebolaget L M Ericsson (Publ)

发明人： HELLMARK, Martin

IPC分类号： H03M1/12 ,  H03M1/66 ,  H04L1/00

CPC分类号： H03M1/66 ,  H03M1/129 ,  H03M1/185

摘要： A transceiver includes a receiver and a transmitter. The receiver includes an analog-to-digital conversion device for converting a received analog signal to digital form, and the transmitter includes a digital-to-analog conversion device for converting a digital signal into analog form for transmission. A selector selects the resolutions of the conversion devices. The resolution of the analog-to-digital conversion device is selected based on a received signal quality, e.g., the signal-to-noise ratio or the signal-to-interference ratio. The resolution of the digital-to-analog conversion device is selected based on a crest factor of the transmitted signal, the crest factor depending, e.g., on the modulation format of the signal being transmitted. The higher the crest factor, the higher the resolution selected.