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1. 发明授权

US06625286B1 Precise amplitude correction circuit 有权
标题翻译：精密振幅校正电路
公开(公告)号：US06625286B1
公开(公告)日：2003-09-23
申请号：US09336008
申请日：1999-06-18
申请人： Raymond Rubacha , Kendall G. Moore , Samuel L. Thomasson
发明人： Raymond Rubacha , Kendall G. Moore , Samuel L. Thomasson
IPC分类号： H04B1500
CPC分类号： H04S1/00
摘要： Amplitude is corrected by subtracting a component signal from a composite signal to produce a remainder signal, correlating the remainder signal with the component signal to produce a product signal, averaging the product signal, and adjusting the magnitude of the component signal in accordance with the averaged product signal to minimize the product signal. The amplitude of the component signal is adjusted in a programmable gain amplifier controlled by an up-down counter. The up-down counter is part of a digital control loop including a pseudo-multiplier for multiplying the remainder signal with the component signal. The output of the multiplier controls the direction of the count, which is generally continuous except that it cannot roll over or roll under. The remainder signal is the received signal with the echo removed.
摘要翻译：通过从复合信号中减去分量信号以产生余数信号来校正振幅，将余数信号与分量信号相关，以产生乘积信号，对产品信号进行平均，并根据平均值调整分量信号的幅度产品信号最小化产品信号。在由上下计数器控制的可编程增益放大器中调整分量信号的幅度。升降计数器是数字控制回路的一部分，包括用于将余数信号与分量信号相乘的伪乘数。乘数的输出控制计数的方向，通常是连续的，不能翻转或滚动。余数信号是接收到的信号，其中回波消除。

2. 发明授权

US06252967B1 Reducing acoustic feedback with digital modulation 有权
标题翻译：通过数字调制降低声反馈
公开(公告)号：US06252967B1
公开(公告)日：2001-06-26
申请号：US09234731
申请日：1999-01-21
申请人： Kendall G. Moore , Samuel L. Thomasson , Richard W. Ulmer
发明人： Kendall G. Moore , Samuel L. Thomasson , Richard W. Ulmer
IPC分类号： H04B1500
CPC分类号： H04B1/123 , H04R3/02
摘要： Sound is converted into an electrical signal by a microphone and is converted into an inaudible, digitally modulated signal that is combined with the electrical signal from the microphone, amplified, and converted into sound waves by a speaker. Any sound traveling from the speaker back to the microphone includes the inaudible component representing the original sound. The inaudible component is separated from the audible components, and the original sound is reconstructed in a digital demodulator. The reconstructed original sound is subtracted from the signal from the microphone, thereby reducing any echo and canceling feedback. Digital modulation includes any form of shift keying, including coherent and noncoherent techniques for modulating frequency, phase, or amplitude.
摘要翻译：声音由麦克风转换为电信号，并被转换为与麦克风的电信号相组合的无声数字调制信号，放大并由扬声器转换成声波。从扬声器返回到麦克风的任何声音包括代表原始声音的听不到的部分。不可听见的成分与声音成分分离，原始声音在数字解调器中重建。从麦克风的信号中减去重建的原始声音，从而减少任何回声和消除反馈。数字调制包括任何形式的移位键控，包括用于调制频率，相位或幅度的相干和非相干技术。

3. 发明授权

US06421443B1 Acoustic and electronic echo cancellation 有权
标题翻译：声学和电子回声消除
公开(公告)号：US06421443B1
公开(公告)日：2002-07-16
申请号：US09360211
申请日：1999-07-23
申请人： Kendall G. Moore , Samuel L. Thomasson
发明人： Kendall G. Moore , Samuel L. Thomasson
IPC分类号： H04M100
CPC分类号： G06J1/00
摘要： A transmitted signal is coupled through a coarse delay and a fine delay to one input of a correlator. Another input of the correlator is coupled to a received signal. The delays are adjusted for maximum correlation and the output of the fine delay is subtracted from the received signal to reduce or eliminate an echo. The delays operate by sampling the signal and storing the samples at successive storage sites. The storage sites are read a predetermined time later, producing the delay. The read operation for the coarse echo includes three readings from separate sites and using the correlation products to indicate the magnitude and direction for changing the delay.
摘要翻译：发射信号通过粗略延迟和精细延迟耦合到相关器的一个输入端。相关器的另一输入耦合到接收信号。调整延迟以实现最大相关性，并从接收到的信号中减去精细延迟的输出以减少或消除回波。延迟通过对信号进行采样并将样本存储在连续的存储位置来进行操作。存储站点在预定时间后读取，产生延迟。粗糙回波的读取操作包括来自不同站点的三个读数，并且使用相关乘积来指示用于改变延迟的幅度和方向。

4. 发明授权

US6166573A High resolution delay line 有权
标题翻译：高分辨率延时线
公开(公告)号：US6166573A
公开(公告)日：2000-12-26
申请号：US361014
申请日：1999-07-23
申请人： Kendall G. Moore , Samuel L. Thomasson
发明人： Kendall G. Moore , Samuel L. Thomasson
IPC分类号： G06J1/00 , H03M1/12
CPC分类号： G06J1/00
摘要： A high resolution delay line includes a coarse delay having a minimum period of delay and a fine delay having a total delay, wherein the total delay is equal to or greater than half the minimum period. Each delay can be implemented in analog or digital form and the delay line can be implemented with one portion in analog form and the remainder in digital form. The digital delay can provide a delay upward of 1,500 milliseconds. The fine delay provides a resolution of ten microseconds or less. An unknown delay is measured by coupling a signal into two channels, wherein the first channel includes the unknown delay and the second channel includes the coarse delay and the fine delay. The output signals from the channels are correlated while adjusting the coarse delay for maximum correlation and then adjusting the fine delay for maximum correlation.
摘要翻译：高分辨率延迟线包括具有最小延迟周期的粗延迟和具有总延迟的精细延迟，其中总延迟等于或大于最小周期的一半。每个延迟可以以模拟或数字形式实现，并且延迟线可以以模拟形式的一部分和数字形式的其余部分来实现。数字延迟可以提供1500毫秒的延迟。精细的延迟提供10微秒或更少的分辨率。通过将信号耦合到两个信道来测量未知延迟，其中第一信道包括未知延迟，第二信道包括粗延迟和精细延迟。来自通道的输出信号被相关联，同时调整粗延迟以获得最大相关性，然后调整精细延迟以获得最大相关性。

5. 发明授权

US06608898B1 Band pass and notch filters for echo reduction with less phase distortion 有权
标题翻译：带通滤波器和陷波滤波器，用于减少相位失真
公开(公告)号：US06608898B1
公开(公告)日：2003-08-19
申请号：US09413677
申请日：1999-10-06
申请人： Kendall G. Moore , Samuel L. Thomasson
发明人： Kendall G. Moore , Samuel L. Thomasson
IPC分类号： H04M908
CPC分类号： H03H19/004 , H03H11/04 , H04M9/082
摘要： A complementary comb filter includes a plurality of band pass filters and a plurality of notch filters, wherein the notch filters have the same center frequencies as the band pass filters or the same center frequencies as the dead bands defined by the band pass filters. Phase distortion by the notch filters occurs primarily in the notch, thereby eliminating distortion of the signal.
摘要翻译：互补梳状滤波器包括多个带通滤波器和多个陷波滤波器，其中陷波滤波器具有与带通滤波器相同的中心频率或与由带通滤波器定义的死区相同的中心频率。陷波滤波器的相位失真主要发生在切口中，从而消除信号的失真。

6. 发明授权

US06301364B1 Tagging echoes with low frequency noise 有权
标题翻译：标签响应低频噪声
公开(公告)号：US06301364B1
公开(公告)日：2001-10-09
申请号：US09413675
申请日：1999-10-06
申请人： Donald Allan Lowmiller , Kendall G. Moore , Samuel L. Thomasson
发明人： Donald Allan Lowmiller , Kendall G. Moore , Samuel L. Thomasson
IPC分类号： H04B320
CPC分类号： H04M9/082
摘要： A low pass limited, low frequency pseudo-random noise signal is added to the input signal for tagging the input signal in order to facilitate correlation with an echo.
摘要翻译：将低通限制的低频伪随机噪声信号添加到输入信号中以标记输入信号，以便于与回波相关。

7. 发明授权

US6166766A Sensing circuit for capturing a pixel signal 失效
标题翻译：用于捕获像素信号的感测电路
公开(公告)号：US6166766A
公开(公告)日：2000-12-26
申请号：US929125
申请日：1997-09-03
申请人： Kendall G. Moore , Frederic B. Shapiro , Deborah J. Beckwith , Michael W. Hodel
发明人： Kendall G. Moore , Frederic B. Shapiro , Deborah J. Beckwith , Michael W. Hodel
IPC分类号： G06T1/00 , H04N5/217
CPC分类号： H04N5/3575 , H04N5/3658 , H04N5/378
摘要： A sensing circuit (202) uses correlated double sampling to sample a first pixel signal of a pixel stream (V.sub.PIXEL) at two different times to produce a dark signal and a light signal on two capacitors (310, 314). The dark and light signals are amplified in an amplifier (302) to produce a differential output signal (V.sub.PP -V.sub.PN) proportional to their difference. While the samples of the first pixel signal are being amplified, a second pixel signal is double-sampled to produce dark and light signals on two other capacitors (312, 316) for amplifying in the same amplifier. The period of the pixel signal is divided into time slots (T.sub.1 -T.sub.16) by a clocked oscillator (52). Programming signals (PROG1, PROG2) control the time slots in which sampling control pulses (V.sub.S1, V.sub.S2) are generated.
摘要翻译：感测电路（202）使用相关双采样在两个不同时间对像素流（VPIXEL）的第一像素信号进行采样，以在两个电容器（310,314）上产生暗信号和光信号。暗信号和光信号在放大器（302）中被放大，以产生与它们的差成比例的差分输出信号（VPP-VPN）。当第一像素信号的样本被放大时，第二像素信号被双采样以在另外两个电容器（312,316）上产生暗和光信号，以在同一放大器中进行放大。像素信号的周期由时钟振荡器（52）分为时隙（T1-T16）。编程信号（PROG1，PROG2）控制产生采样控制脉冲（VS1，VS2）的时隙。

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