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1.发明申请公开(公告)号：US20170111743A1
公开(公告)日：2017-04-20
申请号：US15261937
申请日：2016-09-10
Applicant: ESS Technology, Inc.
Inventor： Peter John Frith , Frederic Schrive , Hwang Soo Son , Dustin Dale Forman
CPC classification number: H04R5/04 , H04R29/001 , H04R2420/01 , H04R2420/05 , H04R2499/11
Abstract: An apparatus and method is disclosed for achieving improved sound quality from mobile ‘hifi’ playback devices by driving compatible headphones in ‘balanced’ or ‘differential’ mode via standard size headphone connectors on the device, while retaining full compliance with legacy jack connections and conventional headphones. When a headphone is connected, a smartphone may determine whether the headphone is one capable of accepting balanced audio signals, or one that uses a conventional 3-pole jack or a 4-pole CTIA or OMTP jack. For a headphone that accepts balanced audio signals, the four poles of a 4-pole jack are used to drive left and right audio channels, and inverted left and right audio channels. For conventional 3-pole or 4-pole jacks, switches in the smartphone adapt the audio output signals to the configuration expected by the headphone.
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公开(公告)号：US20210330279A1
公开(公告)日：2021-10-28
申请号：US17241417
申请日：2021-04-27
Applicant: ESS Technology, Inc.
Inventor： Dustin Dale Forman , Christian Leth Petersen , A. Martin Mallinson
Abstract: An improved method and apparatus for detecting and measuring one or more biometric parameters of a user using a computing device in conjunction with an electroacoustic (audio) transducer is described. A first mode in which the audio transducer produces sound is disabled, and the device is placed in a second mode of operation in which a biometric signal is recovered from the transducer using a “back” audio signal. The biometric signal may then be measured or analyzed. The first mode is disabled by temporarily creating a high impedance between circuitry producing the audio signal and the transducer, while the biometric parameter is measured. This allows for detection of the biometric event without the need for significant additional components or circuitry. The computing device may most conveniently be a smartphone, but the approach described herein may also be easily and usefully applied to tablets, laptop or desktop computers or other devices.
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公开(公告)号：US20140103977A1
公开(公告)日：2014-04-17
申请号：US14055772
申请日：2013-10-16
Applicant: ESS Technology, Inc.
Inventor： Hu Jing Yao , Dustin Dale Forman , A. Martin Mallinson
IPC: H03L7/195
Abstract: A method and system is disclosed in which the phase detector in a phase-locked loop is able to run at the fastest speed appropriate for a reference signal. A frequency offset is added, to the output frequency of the phase-locked loop, to alter the frequency fed to the frequency divider which would receive the output frequency in a conventional PLL to an intermediate frequency. The frequency offset is selected so that the ratio of the intermediate frequency to the reference frequency is a simple fraction, and preferably an integer, i.e., the intermediate frequency is a multiple of the reference frequency. In cases where the relationship between the output frequency and the reference frequency is largely relatively prime, the phase detector is thus able to receive signals at the frequency of the reference signal and operate at the fastest speed appropriate for the reference signal.
Abstract translation: 公开了一种方法和系统，其中锁相环中的相位检测器能够以适合于参考信号的最快速度运行。 将频偏添加到锁相环的输出频率，以改变馈送到分频器的频率，该分频器将常规PLL中的输出频率接收到中频。 选择频率偏移，使得中频与参考频率的比率是简单的分数，优选地是整数，即中频是参考频率的倍数。 在输出频率和参考频率之间的关系很大程度上相对于素数的情况下，相位检测器因此能够以参考信号的频率接收信号并且以适合于参考信号的最快速度进行操作。
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公开(公告)号：US20170111742A1
公开(公告)日：2017-04-20
申请号：US15261936
申请日：2016-09-10
Applicant: ESS Technology, Inc.
Inventor： Dustin Dale Forman , Peter John Frith , Frederic Schrive , Hwang Soo Son
CPC classification number: H04R5/04 , H04R29/001 , H04R2420/01 , H04R2420/05 , H04R2499/11
Abstract: An apparatus and method is disclosed for achieving improved sound quality from mobile ‘hifi’ playback devices by driving compatible headphones in ‘balanced’ or ‘differential’ mode via standard size headphone connectors on the device, while retaining full compliance with legacy jack connections and conventional headphones. When a headphone is connected, a smartphone may determine whether the headphone is one capable of accepting balanced audio signals, or one that uses a conventional 3-pole jack or a 4-pole CTIA or OMTP jack. For a headphone that accepts balanced audio signals, the four poles of a 4-pole jack are used to drive left and right audio channels, and inverted left and right audio channels. For conventional 3-pole or 4-pole jacks, switches in the smartphone adapt the audio output signals to the configuration expected by the headphone.
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公开(公告)号：US09065384B1
公开(公告)日：2015-06-23
申请号：US14482962
申请日：2014-09-10
Applicant: ESS Technology, Inc.
Inventor： Robert L. Blair , Hu Jing Yao , Dustin Dale Forman , A. Martin Mallinson
CPC classification number: H03F1/00 , H03F1/32 , H03F3/187 , H03F3/45475 , H03F3/72 , H03F2200/03 , H03F2203/45136 , H03F2203/7221 , H03F2203/7239
Abstract: A system and method is disclosed for selecting between two electronic signals, one of high quality, such as music audio, and the other of low quality, such as telephone call audio, in a smart phone, tablet or other device. In one embodiment, when the low quality signal is to be used this is accomplished by disabling the amplifier output to disconnect the high quality audio signal from the output port, rather than by means of a switch between the amplifier and the output port as in the prior art. This eliminates degradation of the signal due to the switch when the high quality signal is to be used. The amplifier typically has an associated feedback resistor network, and this may also be disconnected by means of a switch when the low quality signal is to be used, thus preventing distortion of the low quality signal due to the feedback network being a parallel load to the output port.
Abstract translation: 公开了一种用于在智能电话，平板电脑或其他设备中的两个电子信号之间进行选择的系统和方法，诸如音乐音频之类的高质量之一和低质量的电话信号，例如电话呼叫音频。 在一个实施例中，当要使用低质量信号时，这通过禁用放大器输出来从输出端口断开高质量音频信号而不是通过放大器和输出端口之间的开关来实现，如 现有技术 这消除了当使用高质量信号时由于开关引起的信号劣化。 放大器通常具有相关联的反馈电阻器网络，并且当使用低质量信号时，这也可以通过开关断开，从而防止低质量信号由于反馈网络是并行负载而失真 输出端口
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Patent Agency Ranking
公开(公告)号：US08693972B2
公开(公告)日：2014-04-08
申请号：US13668253
申请日：2012-11-03
Applicant: ESS Technology, Inc
Inventor： Dustin Dale Forman , A. Martin Mallinson , Robert Lynn Blair
CPC classification number: H03D7/18 , H03D7/165 , H03D2200/0062 , H03D2200/0068 , H03D2200/0072
Abstract: A method and system is disclosed for designing a radio for down-converting RF signals to IF signals by sampling the signals in a round-robin sampling circuit and multiplying the samples by coefficients that are changed at a fixed rate equal to the rate of operation of each of the sampling circuits. The circuit is able to down-convert multiple channels simultaneously to adjacent positions in the IF band, while rejecting unwanted image signals. The method and system avoids the difficulty and cost of directly digitizing the RF signal, allowing each component to operate at a greatly reduced speed. The coefficients are selected to provide the desired transfer function while keeping the output signal centered at a desired frequency.
Abstract translation: 公开了一种用于设计用于将RF信号下变频成IF信号的无线电装置的方法和系统，该方法和系统是通过对循环采样电路中的信号进行采样并将采样乘以以等于 每个采样电路。 该电路能够将多个信道同时下变频到IF频带中的相邻位置，同时拒绝不需要的图像信号。 该方法和系统避免了直接数字化RF信号的困难和成本，从而允许每个组件以大大降低的速度运行。 选择系数以提供期望的传递函数，同时将输出信号保持在期望频率的中心。
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公开(公告)号：US20130241647A1
公开(公告)日：2013-09-19
申请号：US13683637
申请日：2012-11-21
Applicant: ESS TECHNOLOGY, INC.
Inventor： Dustin Dale Forman , Trevor Blake Lynch-Staunton , Montana T.C. Reid
IPC: H03F3/217
CPC classification number: H03F3/217 , H03F1/3205 , H03F3/2171 , H03F3/2175
Abstract: The present application describes an apparatus and method for reducing distortion in a class-D amplifier. The power output section of the amplifier is driven by an adjusted PWM signal, rather than by a PWM signal created directly from the input analog signal. A reference output, designed to closely track the input analog signal, is compared to the amplifier output. The resulting difference is an error signal which is inverted and summed with a second analog signal corresponding to the directly created PWM signal and changes the timing of the voltage transitions of the second analog signal. The changed voltage transitions are used to create the adjusted PWM signal. The inversion of the error signal causes negative feedback which results in the adjustment of the PWM signal being in a direction which reduces the error signal and thus the distortion of the amplifier.
Abstract translation: 本申请描述了用于减少D类放大器中的失真的装置和方法。 放大器的功率输出部分由调整后的PWM信号驱动，而不是直接由输入模拟信号产生的PWM信号驱动。 与输出模拟信号紧密跟踪的参考输出与放大器输出进行比较。 所产生的差异是将与直接产生的PWM信号对应的第二模拟信号反相并相加并且改变第二模拟信号的电压转换的定时的误差信号。 改变的电压转换用于创建调整后的PWM信号。 误差信号的反转引起负反馈，导致PWM信号的调整在减小误差信号的方向上，从而导致放大器的失真。
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公开(公告)号：US20130115906A1
公开(公告)日：2013-05-09
申请号：US13668253
申请日：2012-11-03
Applicant: ESS Technology, Inc.
Inventor： Dustin Dale Forman , A. Martin Mallinson , Robert Lynn Blair
IPC: H04B1/26
CPC classification number: H03D7/18 , H03D7/165 , H03D2200/0062 , H03D2200/0068 , H03D2200/0072
Abstract: A method and system is disclosed for designing a radio for down-converting RF signals to IF signals by sampling the signals in a round-robin sampling circuit and multiplying the samples by coefficients that are changed at a fixed rate equal to the rate of operation of each of the sampling circuits. The circuit is able to down-convert multiple channels simultaneously to adjacent positions in the IF band, while rejecting unwanted image signals. The method and system avoids the difficulty and cost of directly digitizing the RF signal, allowing each component to operate at a greatly reduced speed. The coefficients are selected to provide the desired transfer function while keeping the output signal centered at a desired frequency.
Abstract translation: 公开了一种用于设计用于将RF信号下变频成IF信号的无线电装置的方法和系统，该方法和系统是通过对循环采样电路中的信号进行采样并将采样乘以以等于 每个采样电路。 该电路能够将多个信道同时下变频到IF频带中的相邻位置，同时拒绝不需要的图像信号。 该方法和系统避免了直接数字化RF信号的困难和成本，从而允许每个组件以大大降低的速度运行。 选择系数以提供期望的传递函数，同时将输出信号保持在期望频率的中心。
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公开(公告)号：US11606100B1
公开(公告)日：2023-03-14
申请号：US17510035
申请日：2021-10-25
Applicant: ESS Technology, Inc.
Inventor： Yongsheng Xu , Dustin Dale Forman
Abstract: Described herein is an apparatus and method for enhancing the dynamic range of an analog-to-digital converter (ADC). In one embodiment of the present approach, an analog input signal is amplified in a programmable gain amplifier (PGA) before the ADC receives the signal, so that the gain applied to an input signal, and gain (or attenuation) later applied in order to balance the overall gain of the circuit, occurs only in either the analog domain; in the prior art, gain occurs partly in each domain. The ADC gain is then adjusted to compensate for gain of the PGA and balance the overall gain of the circuit. In another embodiment, the ADC gain is adjusted, and gain of a digital gain element that receives the signal from the ADC is adjusted to compensate for the ADC gain and balance the overall gain of the circuit, eliminating the need for a PGA.
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10.发明授权公开(公告)号：US11569839B1
公开(公告)日：2023-01-31
申请号：US17525407
申请日：2021-11-12
Applicant: ESS Technology, Inc.
Inventor： Dustin Dale Forman
Abstract: Described herein is a method and apparatus for enhancing the dynamic range of a digital-to-analog conversion circuit. Dynamic range enhancement (DRE) is accomplished by modifying the gain of components of the circuit so that the gain of components generating noise is effectively reduced. In a circuit utilizing a plurality of 1-bit DACs, analog signal gain is decreased when the full nominal gain of the analog portion of the circuit is not needed to obtain a desired peak output amplitude. The reduction is accomplished by effectively “disconnecting” some of the plurality of 1-bit DACs. Some or all of the 1-bit DACs are configured to have a third or “tri-state” in which there is no connection to the normal two reference levels thus providing no output. If some portion of the 1-bit DACs is placed in the tri-state, both the signal and noise gain will be reduced.
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