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公开(公告)号：US09319768B2
公开(公告)日：2016-04-19
申请号：US13312897
申请日：2011-12-06
CPC分类号： H04R1/1041 , H01R24/58 , H04R2201/107 , H04R2420/05 , H04R2420/09
摘要： A system for detecting a jack configuration comprising a first plurality of switches configured to couple a first headphone jack position to ground. A second plurality of switches configured to couple a second headphone jack position to ground. A microphone bias circuit for applying a microphone bias signal to the second headphone jack position when the first headphone jack position is coupled to ground, and for applying the microphone bias signal to the first headphone jack position when the second headphone jack position is coupled to ground.
摘要翻译： 一种用于检测插座结构的系统，包括配置成将第一耳机插孔位置耦合到地的第一多个开关。 配置成将第二耳机插孔位置耦合到地的第二多个开关。 麦克风偏置电路，用于当第一耳机插孔位置耦合到地面时将麦克风偏置信号施加到第二耳机插孔位置，并且当第二耳机插孔位置耦合到地面时将麦克风偏置信号施加到第一耳机插孔位置 。
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公开(公告)号：US08587287B2
公开(公告)日：2013-11-19
申请号：US12828640
申请日：2010-07-01
申请人： Christian Larsen , Lorenzo Crespi
发明人： Christian Larsen , Lorenzo Crespi
IPC分类号： G05F3/16
CPC分类号： G05F3/262
摘要： High linearity is essential in audio circuitry. As sampling rates for audio applications are needed, high speed and high linearity are needed in analog and mixed signal portions of audio circuitry such as in current mirrors. A current mirror employs two current paths in an output. The first current path is driven by a fast acting transistor through a resistor. The second current path is driven by a differential amplifier coupled to another transistor through another resistor. The second current path is used to maintain linearity by causing the voltage across both transistors to be the same.
摘要翻译： 高线性度在音频电路中至关重要。 由于需要音频应用的采样率，所以在诸如电流镜之类的音频电路的模拟和混合信号部分中需要高速和高线性度。 电流镜在输出中使用两个电流路径。 第一电流路径由快速作用的晶体管通过电阻驱动。 第二电流路径由通过另一个电阻耦合到另一个晶体管的差分放大器驱动。 第二电流路径用于通过使两个晶体管两端的电压相同来保持线性度。
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公开(公告)号：US20130142350A1
公开(公告)日：2013-06-06
申请号：US13312897
申请日：2011-12-06
IPC分类号： H04R1/10
CPC分类号： H04R1/1041 , H01R24/58 , H04R2201/107 , H04R2420/05 , H04R2420/09
摘要： A system for detecting a jack configuration comprising a first plurality of switches configured to couple a first headphone jack position to ground. A second plurality of switches configured to couple a second headphone jack position to ground. A microphone bias circuit for applying a microphone bias signal to the second headphone jack position when the first headphone jack position is coupled to ground, and for applying the microphone bias signal to the first headphone jack position when the second headphone jack position is coupled to ground.
摘要翻译： 一种用于检测插座结构的系统，包括配置成将第一耳机插孔位置耦合到地的第一多个开关。 配置成将第二耳机插孔位置耦合到地的第二多个开关。 麦克风偏置电路，用于当第一耳机插孔位置耦合到地面时将麦克风偏置信号施加到第二耳机插孔位置，并且当第二耳机插孔位置耦合到地面时将麦克风偏置信号施加到第一耳机插孔位置 。
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公开(公告)号：US08063699B2
公开(公告)日：2011-11-22
申请号：US12488438
申请日：2009-06-19
申请人： Xin Fan , Christian Larsen , Lorenzo Crespi
发明人： Xin Fan , Christian Larsen , Lorenzo Crespi
IPC分类号： H03F1/14
CPC分类号： H03F1/305 , H03F3/3022 , H03F3/45183 , H03F2200/144 , H03F2203/45526 , H03F2203/45534 , H03F2203/45674
摘要： Presently many audio chips suffer from pop issues, which is especially serious for single ended audio drivers. An audio pop is a disturbance in the output caused by a sudden transition of chip power, particularly when a chip is powered on or powered off. Furthermore, compensation networks included in the amplifiers on audio chips for stability offer a significant path for transmitting power disturbances to the output. Hence, circuitry is developed to suppress pops in the output stages of an amplifier.
摘要翻译： 目前许多音频芯片遭受流行问题，对于单端音频驱动程序来说尤其严重。 音频弹奏是由芯片功率的突然转换引起的输出干扰，特别是当芯片通电或断电时。 此外，用于稳定性的用于音频芯片的放大器中的补偿网络提供了将功率干扰发送到输出的重要路径。 因此，开发电路以抑制放大器的输出级中的弹出。
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25.发明申请Systems and Methods for Offset Cancellation Method for DC-Coupled Audio Drivers 有权直流耦合音频驱动器偏移消除方法的系统和方法公开(公告)号：US20110123049A1
公开(公告)日：2011-05-26
申请号：US12623202
申请日：2009-11-20
申请人： Lorenzo Crespi , Christian Larsen
发明人： Lorenzo Crespi , Christian Larsen
CPC分类号： H03F1/301 , H03F1/305 , H03F3/45986
摘要： Direct current (DC) offset in and audio driver can cause a constant drain on power even when there is no sound. Furthermore it can cause an audible pop when the audio driver is enabled. A scaled replica output stage can be employed to perform DC offset cancellation offline during a sampling phase. Once DC offset cancellation is achieved, the audio driver uses a full scale output stage during the operation phase.
摘要翻译： 即使没有声音，直流（DC）偏移和音频驱动器也会导致电源的恒定漏电。 此外，当音频驱动程序启用时，它可能会导致声音弹出。 可以采用缩放的副本输出级，以在采样阶段离线执行直流偏移消除。 一旦实现了DC偏移消除，则音频驱动器在操作阶段使用满量程输出级。
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公开(公告)号：US08432148B2
公开(公告)日：2013-04-30
申请号：US13525071
申请日：2012-06-15
CPC分类号： H03F1/305 , H03F3/181 , H03F2200/03 , H03K17/223 , H03K17/28
摘要： A circuit for providing a reference voltage can be widely used in audio applications. However, at startup an abrupt start in the reference signal can cause undesirable audible artifacts. A circuit employing feedback of a reference voltage to control the charging of a capacitor which provides the reference voltage can be used to provide a smooth startup to the reference voltage. The circuit contains a differential pair for steering a fixed current source from one path to another as the reference voltage increases. The steered current can then be mirrored into one ore more current mirrors where the newly mirrored current can be squeezed to zero when the difference between a desired reference voltage and the reference voltage approaches zero. This newly mirrored current can be used to charge a capacitor which is used to provide the reference voltage.
摘要翻译： 用于提供参考电压的电路可以广泛地用于音频应用中。 然而，在启动时，参考信号中的突然启动可能导致不希望的可听见的伪影。 采用参考电压的反馈来控制提供参考电压的电容器的充电的电路可用于提供对参考电压的平滑启动。 该电路包含用于在参考电压增加时将固定电流源从一个路径转向另一个路径的差分对。 转向电流可以被镜像到一个以上的电流镜中，当期望的参考电压和参考电压之间的差值接近零时，新镜像电流可以被压缩到零。 这个新镜像电流可以用于对用于提供参考电压的电容器进行充电。
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公开(公告)号：US08411877B2
公开(公告)日：2013-04-02
申请号：US12578477
申请日：2009-10-13
申请人： Christian Larsen , Lorenzo Crespi , Mouna Elkhatib
发明人： Christian Larsen , Lorenzo Crespi , Mouna Elkhatib
CPC分类号： H03G5/005
摘要： An integrated audio codec includes a high-pass filter to prevent damage to personal computer speakers and other components. The audio codec may be compliant with HD audio standards and can operate with generic software drivers. Tuning of the high-pass filter is provided through an external pin-out where either an external capacitor or external resistors provide an ability to tune the high-pass filter. In one implementation, a tuning voltage is digitized into a tuning code used by a digital high-pass filter. In addition, multiplexers can be used to insure only the audio path leading to the speakers is filtered.
摘要翻译： 集成音频编解码器包括高通滤波器，以防止损坏个人计算机扬声器和其他组件。 音频编解码器可以符合HD音频标准，并且可以与通用软件驱动程序一起操作。 通过外部引脚提供高通滤波器的调谐，其中外部电容器或外部电阻器提供调谐高通滤波器的能力。 在一个实现中，调谐电压被数字化为由数字高通滤波器使用的调谐码。 此外，多路复用器可以用于确保仅通过扬声器的音频路径被过滤。
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公开(公告)号：US08325940B2
公开(公告)日：2012-12-04
申请号：US12339635
申请日：2008-12-19
IPC分类号： H04B15/00
CPC分类号： H04R3/00 , H03F1/305 , H03F3/187 , H03F2200/03 , H03F2200/249 , H03F2200/414 , H03G3/348
摘要： A driver controller comprising a state machine for controlling transitions between a plurality of states. An output switch for providing a low impedance path to ground during transition periods. An output stage for decoupling output signal from driver amplifier during the transition periods.
摘要翻译： 一种驱动器控制器，包括用于控制多个状态之间的转换的状态机。 输出开关，用于在过渡期间提供低阻抗地线路径。 用于在过渡期间将输出信号与驱动放大器去耦的输出级。
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公开(公告)号：US08446216B2
公开(公告)日：2013-05-21
申请号：US13300012
申请日：2011-11-18
申请人： Xin Fan , Christian Larsen , Lorenzo Crespi
发明人： Xin Fan , Christian Larsen , Lorenzo Crespi
IPC分类号： H03F1/14
CPC分类号： H03F1/305 , H03F3/3022 , H03F3/45183 , H03F2200/144 , H03F2203/45526 , H03F2203/45534 , H03F2203/45674
摘要： Presently many audio chips suffer from pop issues, which is especially serious for single ended audio drivers. An audio pop is a disturbance in the output caused by a sudden transition of chip power, particularly when a chip is powered on or powered off. Furthermore, compensation networks included in the amplifiers on audio chips for stability offer a significant path for transmitting power disturbances to the output. Hence, circuitry is developed to suppress pops in the output stages of an amplifier.
摘要翻译： 目前许多音频芯片遭受流行问题，对于单端音频驱动程序来说尤其严重。 音频弹奏是由芯片功率的突然转换引起的输出干扰，特别是当芯片通电或断电时。 此外，用于稳定性的用于音频芯片的放大器中的补偿网络提供了将功率干扰发送到输出的重要路径。 因此，开发电路以抑制放大器的输出级中的弹出。
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公开(公告)号：US20120313712A1
公开(公告)日：2012-12-13
申请号：US13525071
申请日：2012-06-15
CPC分类号： H03F1/305 , H03F3/181 , H03F2200/03 , H03K17/223 , H03K17/28
摘要： A circuit for providing a reference voltage can be widely used in audio applications. However, at startup an abrupt start in the reference signal can cause undesirable audible artifacts. A circuit employing feedback of a reference voltage to control the charging of a capacitor which provides the reference voltage can be used to provide a smooth startup to the reference voltage. The circuit contains a differential pair for steering a fixed current source from one path to another as the reference voltage increases. The steered current can then be mirrored into one ore more current mirrors where the newly mirrored current can he squeezed to zero when the difference between a desired reference voltage and the reference voltage approaches zero. This newly mirrored current can he used to charge a capacitor which is used to provide the reference voltage.
摘要翻译： 用于提供参考电压的电路可以广泛地用于音频应用中。 然而，在启动时，参考信号中的突然启动可能导致不希望的可听见的伪影。 采用参考电压的反馈来控制提供参考电压的电容器的充电的电路可用于提供对参考电压的平滑启动。 该电路包含用于在参考电压增加时将固定电流源从一个路径转向另一个路径的差分对。 转向电流然后可以被镜像到一个更多的电流镜中，当所需参考电压和参考电压之间的差值接近零时，可以将新镜像电流挤压到零。 这个新镜像电流可以用来充电用于提供参考电压的电容器。
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