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公开(公告)号：US11211938B2
公开(公告)日：2021-12-28
申请号：US17241775
申请日：2021-04-27
Applicant: ESS Technology, Inc.
Inventor： A. Martin Mallinson
Abstract: A digitally controlled oscillator (DCO) that generates an output frequency clock signal without drift and can be rapidly locked to an input or reference clock is described. A variable-modulus-fixed-increment form of DCO is configured to divide the frequency of a nominally fixed frequency oscillator. A constant is derived from the ratio of a fixed increment to the desired output frequency; this constant is multiplied by the frequency of the oscillator and the modulus adjusted to keep the ratio of the input clock and the output clock constant. The frequency of the oscillator is conveniently measured by counting the number of cycles between input cycles of a reference frequency. The oscillator must be greater in frequency than the expected output and is most accurate in cases where the reference frequency is low compared to the expected output frequency.
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公开(公告)号：US20210336625A1
公开(公告)日：2021-10-28
申请号：US17241775
申请日：2021-04-27
Applicant: ESS Technology, Inc.
Inventor： A. Martin Mallinson
Abstract: A digitally controlled oscillator (DCO) that generates an output frequency clock signal without drift and can be rapidly locked to an input or reference clock is described. A variable-modulus-fixed-increment form of DCO is configured to divide the frequency of a nominally fixed frequency oscillator. A constant is derived from the ratio of a fixed increment to the desired output frequency; this constant is multiplied by the frequency of the oscillator and the modulus adjusted to keep the ratio of the input clock and the output clock constant. The frequency of the oscillator is conveniently measured by counting the number of cycles between input cycles of a reference frequency. The oscillator must be greater in frequency than the expected output and is most accurate in cases where the reference frequency is low compared to the expected output frequency.
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公开(公告)号：US11081097B2
公开(公告)日：2021-08-03
申请号：US16917085
申请日：2020-06-30
Applicant: ESS Technology, Inc.
Inventor： Christian Leth Petersen , Shawn William Scarlett , A. Martin Mallinson
IPC: G10K11/178 , H04R1/10
Abstract: A system and method for passively balancing electroacoustic transducers so that sounds other than the transducer's output can be detected. A transducer producing audio output based upon an input audio signal can operate in reverse to produce a signal in response to the impact of external sound upon the transducer from another source. This “reverse” or “microphone” signal represents the sound from the other source. Transducers are operated in monophonic mode, each in opposite polarity to the other thus canceling out and leaving only the microphone signal created by the transducers, i.e., a signal representing the external sound. The microphone signal can be amplified, and can be filtered and processed to identify and/or obtain various types of information about the sound received by the transducers.
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公开(公告)号：US20210005175A1
公开(公告)日：2021-01-07
申请号：US16917085
申请日：2020-06-30
Applicant: ESS Technology, Inc.
Inventor： Christian Leth Petersen , Shawn William Scarlett , A. Martin Mallinson
IPC: G10K11/178 , H04R1/10
Abstract: A system and method for passively balancing electroacoustic transducers so that sounds other than the transducer's output can be detected. A transducer producing audio output based upon an input audio signal can operate in reverse to produce a signal in response to the impact of external sound upon the transducer from another source. This “reverse” or “microphone” signal represents the sound from the other source. Transducers are operated in monophonic mode, each in opposite polarity to the other thus canceling out and leaving only the microphone signal created by the transducers, i.e., a signal representing the external sound. The microphone signal can be amplified, and can be filtered and processed to identify and/or obtain various types of information about the sound received by the transducers.
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公开(公告)号：US20200068290A1
公开(公告)日：2020-02-27
申请号：US16672473
申请日：2019-11-03
Applicant: ESS Technology, Inc.
Inventor： A. Martin Mallinson , Robert Lynn Blair , Christian Leth Petersen , Paul Christopher Scowen
Abstract: An improved system and method for recognizing an audio signal due to physical activity and taking a predetermined action in response is disclosed. A “reverse noise signal” created by the sound pressure wave of the physical activity acting on the earpiece transducer is obtained. In some embodiments, an ambient noise signal is inverted and fed back, and the inverted signal is added to the intended audio signal being sent to the earpiece so that the ambient noise is cancelled. In other embodiments, a processor receives the ambient noise signal and predicts the modification to the intended audio signal needed to counteract the ambient noise. In other embodiments, the reverse noise signal may represent a motor or biological activity of a user; the system may take different actions in response to different physical activities, such as a heart beat of the user, or a tap, footfall, or swallowing by the user.
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Patent Agency Ranking
公开(公告)号：US09647640B2
公开(公告)日：2017-05-09
申请号：US14790448
申请日：2015-07-02
Applicant: ESS Technology, Inc.
Inventor： A. Martin Mallinson
CPC classification number: H03H15/02
Abstract: A system and method is disclosed for placing some of the elements of a FIR filter into a high impedance state in certain situations. When it is detected that the signal to an impedance element is the same as the previous value, then the driver of that impedance element is “turned off” or goes into a high impedance state, so that no current flows through that impedance element, and it no longer contributes to the filter output. Alternatively, if the impedance elements are the same between two adjacent taps of the delay line, the driver of one of those impedance elements may be turned off or go into a high impedance state. The technique may be particularly useful in differential output filters. Turning off a driver effectively removes the attached impedance element from the filter and reduces current flow and power consumption, thus extending battery life in mobile devices.
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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：US09209806B2
公开(公告)日：2015-12-08
申请号：US14314882
申请日：2014-06-25
Applicant: ESS Technology, Inc.
Inventor： A. Martin Mallinson
IPC: H03K19/003 , H03K19/0185 , H03K5/13 , H03K5/14
CPC classification number: H03K19/00315 , H03K5/133 , H03K5/14 , H03K5/15046 , H03K19/00361 , H03K19/00369 , H03K19/018521
Abstract: A delay circuit in which the delay is independent of variations in the power supply which powers the logic gates of the delay circuit is disclosed. By separating the CMOS transistors that form each logic gate by additional CMOS bias transistors which are biased at a controlled voltage, variations in the gate delay of the inverter transistors due to variations in the power supply voltage for the inverter transistors may be minimized. In one embodiment, the constant bias voltage may be provided by a constant current source comprising a series of amplifiers each having a gain significantly less than one connected to a triple cascode.
Abstract translation: 公开了一种延迟电路，其延迟与为延迟电路的逻辑门供电的电源的变化无关。 通过将偏置在受控电压的附加CMOS偏置晶体管分离形成每个逻辑门的CMOS晶体管，由于逆变器晶体管的电源电压的变化，反相晶体管的栅极延迟的变化可能被最小化。 在一个实施例中，恒定偏置电压可以由包括一系列放大器的恒定电流源提供，每个放大器的增益明显小于连接到三重共源共栅的一个。
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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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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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