专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5276685A Digital automatic gain control 失效
标题翻译：数字自动增益控制
公开(公告)号：US5276685A
公开(公告)日：1994-01-04
申请号：US875577
申请日：1992-04-27
申请人： James F. M. Kepler , David E. Borth , Frank J. Cerny, Jr.
发明人： James F. M. Kepler , David E. Borth , Frank J. Cerny, Jr.
IPC分类号： H03G3/20 , H04B7/005 , H04B7/26 , H04L27/18 , H04L27/22 , H04J3/16
CPC分类号： H04W52/40 , H03G3/3078 , H04B7/2643 , H04L27/22 , H04W52/52
摘要： There is provided a method of digital Automatic Gain Control (AGC) in a receiver having limited dynamic range, particularly for discontinuous signals. The method comprises detecting the level of a received and AGC'd discontinuous signal, comparing the level of the AGC'd signal relative to the dynamic range of the receiver, and adjusting the AGC to establish a desired relationship between the AGC'd signal and the dynamic range limitation. There is also provided a method of handoff in a TDMA cellular-type transmission system utilizing this method of AGControl.The method for Automatic Gain Control (AGC) of discontinuous signals in a receiver having limited dynamic range is further characterized by: digitizing a received and AGC'd discontinuous signal and converting the digitized samples to a power sample to sense the power of and detect the level of the signal, comparing the level of the AGC'd signal relative to the dynamic range of the receiver; and coarsely-adjusting by either progressively attenuating the signal until it falls within the dynamic range of the receiver or by progressively gain-amplifying the signal until it falls within the limited dynamic range of the receiver and finely-adjusting the AGC of the received signal until optimum use of the full (albeit limited) dynamic range of the signal processing stages is about 6-12 dB below maximum sensitivity to establish a desired relationship between the AGC'd signal and the dynamic range limitation.
摘要翻译：在具有有限动态范围的接收机中提供了数字自动增益控制（AGC）的方法，特别是对于不连续信号。该方法包括检测接收到的AGC不连续信号的电平，将AGC'd信号的电平相对于接收机的动态范围进行比较，并且调整AGC以建立AGC'd信号与动态范围限制。还提供了一种利用这种AGControl方法的TDMA蜂窝型传输系统中的切换方法。具有有限动态范围的接收机中的不连续信号的自动增益控制（AGC）的方法进一步的特征在于：数字化接收和AGC的不连续信号，并将数字化样本转换成功率样本以感测功率并检测信号电平，比较AGC'd信号的电平相对于接收机的动态范围; 并且通过逐渐衰减信号直到其落入接收机的动态范围或通过逐渐增益放大信号直到其落入接收机的有限动态范围内并且微调接收信号的AGC直到信号处理级的完整（尽管有限的）动态范围的最佳使用比最大灵敏度低大约6-12dB，以建立AGC'd信号和动态范围限制之间的期望的关系。

2. 发明授权

US5301364A Method and apparatus for digital automatic gain control in a receiver 失效
标题翻译：接收机中数字自动增益控制的方法和装置
公开(公告)号：US5301364A
公开(公告)日：1994-04-05
申请号：US26616
申请日：1993-03-04
申请人： John W. Arens , David E. Borth , James F. M. Kepler
发明人： John W. Arens , David E. Borth , James F. M. Kepler
IPC分类号： H03G3/20 , H04B1/30 , H04B7/005 , H04B7/26 , H04L27/18 , H04L27/22 , H04B1/06
CPC分类号： H04W52/40 , H03G3/3052 , H03G3/3078 , H04B1/30 , H04B7/2643 , H04L27/22 , H04W52/52
摘要： There is provided a mechanism for Automatic Gain Control in a receiver. It comprises: determining, within a certain dynamic range, the difference in power between the desired signal and a signal received, and providing open loop gain control for the signal in response to the differential so determined, scaled by the receiver's gain characteristics, such that the signal is positioned within dynamic range so as to reduce saturation and noise.
摘要翻译：在接收机中提供了一种自动增益控制的机制。它包括：在一定动态范围内确定所需信号与所接收的信号之间的功率差异，以及响应由所述接收机的增益特性来缩放的所确定的差分，为所述信号提供开环增益控制，使得该信号位于动态范围内，以减少饱和度和噪声。

3. 发明授权

US4910470A Digital automatic frequency control of pure sine waves 失效
标题翻译：数字自动频率控制纯正弦波
公开(公告)号：US4910470A
公开(公告)日：1990-03-20
申请号：US285147
申请日：1988-12-16
申请人： David E. Borth , James F. M. Kepler
发明人： David E. Borth , James F. M. Kepler
IPC分类号： H03L7/095 , H03J7/02 , H03L7/08 , H03L7/087
CPC分类号： H03J7/02 , H03L7/087 , H03J7/026
摘要： There is provided a method of and apparatus for Automatic Frequency Control (AFC) of pure sine waves (PSW). It comprises discriminating to detect frequency differences between a received pure sine wave and a reference frequency, integrating the frequency differences to average the differences, and adjusting the reference frequency to eliminate the frequency difference. It is further characterized by digitizing, in quadrature, the received pure sine wave, mixing the received pure sine wave with a complex sinusoid to translate the pure sine wave to baseband, quadrature filtering the mixed sine wave, cross-product discriminating to detect frequency differences between a received pure sine wave and a reference frequency, integrating the frequency differences to average the differences, selectively calculating the mean variance between the pure sine wave and the reference frequency, and adjusting the reference frequency of a Voltage Controlled Oscillator to eliminate the frequency difference.

4. 发明授权

US5737327A Method and apparatus for demodulation and power control bit detection in a spread spectrum communication system 失效
标题翻译：扩频通信系统中解调和功率控制位检测的方法和装置
公开(公告)号：US5737327A
公开(公告)日：1998-04-07
申请号：US624329
申请日：1996-03-29
申请人： Fuyun Ling , David E. Borth , Colin D. Frank , Phillip D. Rasky , James F. Kepler
发明人： Fuyun Ling , David E. Borth , Colin D. Frank , Phillip D. Rasky , James F. Kepler
IPC分类号： H04B1/707 , H04B7/005 , H04B7/26 , H04J11/00 , H04J13/00 , H04L25/02 , H04J13/04 , H04Q7/20
CPC分类号： H04W52/60 , H04B1/707 , H04J13/00 , H04L25/0214 , H04W52/42 , H04L25/0226
摘要： A receiver circuit (400, 500) receives a spread spectrum communication signal, such as a DS-CDMA signal, including a pilot channel and including a power control designator. The signal is despread and decoded. The pilot symbols on the pilot channel are provided to a channel estimator (408) for estimating the channel phase and channel gain of the communication channel. This estimate is provided to a demodulator (422) for demodulating the traffic channel symbols. The pilot symbols are provided to another channel estimator (410) for estimating channel phase and channel gain for the power control designator. This estimate is provided to a demodulator (424) for demodulating the power control designator. The traffic channel symbols are delayed a predetermined time in a delay element (420) before demodulating. The power control designator is delayed a short time or not at all in a short delay element (418) before demodulation.
摘要翻译：接收机电路（400,500）接收包括导频信道并包括功率控制指示符的扩频通信信号，例如DS-CDMA信号。信号被解扩和解码。导频信道上的导频符号被提供给用于估计通信信道的信道相位和信道增益的信道估计器（408）。该估计被提供给用于解调业务信道符号的解调器（422）。导频符号被提供给用于估计功率控制指示符的信道相位和信道增益的另一信道估计器（410）。该估计被提供给用于解调功率控制指示符的解调器（424）。业务信道符号在解调之前延迟延迟元件（420）中的预定时间。在解调之前，功率控制指示符在短时间内延迟短暂的延迟元件（418）。

5. 发明授权

US5263052A Viterbi equalizer for radio receiver 失效
标题翻译：无线电接收机的维特比均衡器
公开(公告)号：US5263052A
公开(公告)日：1993-11-16
申请号：US767961
申请日：1991-09-30
申请人： David E. Borth , Bruce D. Mueller , Kevin L. Baum
发明人： David E. Borth , Bruce D. Mueller , Kevin L. Baum
IPC分类号： H04L25/08 , H03H15/00 , H03H17/00 , H03H21/00 , H03M13/23 , H04B3/04 , H04L25/03 , H04L27/22 , H04L5/12
CPC分类号： H04L27/22 , H04L25/03203 , H04L2025/03401 , H04L25/03197
摘要： A Viterbi equalizer for decoding a .pi./4 DQPSK modulated signal. Because symbol values of adjacent symbols of a .pi./4 DQPSK signal are offset in phase relative to one another, allowable values of succeeding states of a .pi./4 DQPSK signal are four in number. The signal paths of the Viterbi equalizer are thereby limited in number to four allowable next-states, and the Viterbi equalizer is operative to select certain ones of the paths connecting the states at the adjacent time intervals as survivor paths to form maximum likelihood paths thereby.
摘要翻译：用于对pi / 4 DQPSK调制信号进行解码的维特比均衡器。由于pi / 4 DQPSK信号的相邻符号的符号值相对于彼此相位偏移，因此pi / 4 DQPSK信号的后续状态的允许值为4。因此，维特比均衡器的信号路径被限制为四个允许的下一状态，并且维特比均衡器用于选择将相邻时间间隔处的状态连接的某些路径作为幸存路径，从而形成最大似然路径。

6. 发明授权

US5233632A Communication system receiver apparatus and method for fast carrier acquisition 失效
标题翻译：用于快速载波采集的通信系统接收机装置和方法
公开(公告)号：US5233632A
公开(公告)日：1993-08-03
申请号：US698765
申请日：1991-05-10
申请人： Kevin L. Baum , David E. Borth , Phillip D. Rasky
发明人： Kevin L. Baum , David E. Borth , Phillip D. Rasky
IPC分类号： H04B1/30
CPC分类号： H04B1/30
摘要： A communications system receiver (100) is disclosed which receives a transmitted signal over a radio channel. The transmitted signal includes data and a predetermined synchronization sequence. The receiver (100) includes a demodulator (215), and a stored replica (207) of the predetermined synchronization sequence. The receiver (100) further includes apparatus (102) for computing (308) a reconstructed signal, by using the channel impulse response characteristic and the stored replica (207) of the synchronization sequence. A feature of the invention is to estimate (310) a phase offset value between an incoming signal and the reconstructed signal, for a plurality of synchronization symbols. This serves to establish (315) a relationship between the phase offset and a synchronization symbol index. The receiver then employs this relationship to derive (317) at least one "previous" phase state (214) for initializing (314) the demodulator (215).
摘要翻译：公开了一种通过无线电信道接收发射信号的通信系统接收机（100）。所发送的信号包括数据和预定的同步序列。接收器（100）包括解调器（215）和预定同步序列的存储副本（207）。接收器（100）还包括用于通过使用信道脉冲响应特性和存储的同步序列副本（207）来计算（308）重构信号的装置（102）。本发明的一个特征是针对多个同步符号来估计（310）输入信号和重构信号之间的相位偏移值。这用于建立（315）相位偏移和同步符号索引之间的关系。接收机然后采用这种关系来导出（317）用于初始化（314）解调器（215）的至少一个“先前”相位状态（214）。

7. 发明授权

US4737976A Hands-free control system for a radiotelephone 失效
标题翻译：无线电话免提控制系统
公开(公告)号：US4737976A
公开(公告)日：1988-04-12
申请号：US59978
申请日：1985-09-03
申请人： David E. Borth , Ira A. Gerson , Richard J. Vilmur
发明人： David E. Borth , Ira A. Gerson , Richard J. Vilmur
IPC分类号： G10L15/00 , G10L15/02 , G10L15/20 , G10L21/02 , H04M1/27 , H04M1/274 , H04M1/2745 , H04M1/60 , H04B1/40
CPC分类号： H04M1/271 , G10L15/00 , H04M1/6041 , H04R2499/13
摘要： An improved hands-free user-interactive control and dialing system is disclosed for use with a speech communications device. The control system (400) includes a dynamic noise suppressor (410), a speech recognizer (420) for implementing voice-control, a device controller (430) responsive to the speech recognizer for controlling operating parameters of the speech communications device (450) and for producing status information representing the operating status of the device, and a speech synthesizer (440) for providing reply information to the user as to the speech communications device operating status. In a mobile radiotelephone application, the spectral subtraction noise suppressor (414) is configured to improve the performance of the speech recognizer (424), the voice quality of the transmitted audio (417), and the audio switching operation of the vehicular speakerphone (460). The combination of noise processing, speech recognition, and speech synthesis provides a substantial improvement to prior art control systems.
摘要翻译： PCT No.PCT / US85 / 01672 Sec。 371日期：1985年9月3日 102（e）1985年9月3日PCT PCT公布1985年9月3日PCT公布。公开号WO87 / 01546 日期为1987年3月12日。公开了一种用于语音通信设备的改进的免提用户交互式控制和拨号系统。控制系统（400）包括用于实现语音控制的动态噪声抑制器（410），语音识别器（420），响应于语音识别器控制语音通信设备（450）的操作参数的设备控制器（430）以及用于产生表示设备的操作状态的状态信息，以及用于向用户提供关于语音通信设备操作状态的回复信息的语音合成器（440）。在移动无线电话应用中，频谱减法噪声抑制器（414）被配置为提高语音识别器（424）的性能，传输音频的语音质量（417）和车载扬声器（460）的音频切换操作）。噪声处理，语音识别和语音合成的组合为现有技术的控制系统提供了实质性的改进。

8. 发明授权

US4775851A Multiplierless decimating low-pass filter for a noise-shaping A/D converter 失效
标题翻译：用于噪声整形A / D转换器的无乘法抽取低通滤波器
公开(公告)号：US4775851A
公开(公告)日：1988-10-04
申请号：US57200
申请日：1987-06-01
申请人： David E. Borth
发明人： David E. Borth
IPC分类号： H03H17/02 , H03H17/06 , H03M3/02 , H03M1/12
CPC分类号： H03H17/0621 , H03H17/0225 , H03H17/0607 , H03H17/0664
摘要： A method and means for filtering the quantization noise from the output of a 1-bit analog-to-digital converter (noise-shaping coder) is disclosed. The A/D utilizes oversampling of the analog input signal, and decimation of the digital output signal. The multiplierless low-pass filter is comprised of a coefficient ROM for storing the filter coefficients, a counter for addressing the memory, and a true/complement gate for selectively complementing the output of the memory in response to the 1-bit data stream from the noise-shaping coder. An accumulator sums the selectively complemented output words for all samples, and the accumulated output is then applied to the decimator. A second embodiment is also disclosed which utilizes an overlapping digital filter approach, wherein a plurality of digital multiplierless filters are overlapped to provide an arbitrary length filter capable of producing an arbitrary filter response.
摘要翻译：公开了一种用于从1位模数转换器（噪声整形编码器）的输出滤波量化噪声的方法和装置。 A / D利用模拟输入信号的过采样和数字输出信号的抽取。无乘法低通滤波器包括用于存储滤波器系数的系数ROM，用于寻址存储器的计数器和用于响应于来自所述存储器的1位数据流选择性地补充存储器的输出的真/补码门噪声整形编码器。累加器对所有采样的有选择地补充的输出字求和，然后累积的输出被施加到抽取器。还公开了利用重叠的数字滤波器方法的第二实施例，其中多个数字无数字滤波器被重叠以提供能够产生任意滤波器响应的任意长度的滤波器。

9. 发明授权

US4630304A Automatic background noise estimator for a noise suppression system 失效
标题翻译：用于噪声抑制系统的自动背景噪声估计器
公开(公告)号：US4630304A
公开(公告)日：1986-12-16
申请号：US750572
申请日：1985-07-01
申请人： David E. Borth , Ira A. Gerson , Richard J. Vilmur
发明人： David E. Borth , Ira A. Gerson , Richard J. Vilmur
IPC分类号： G10L11/00 , G10K11/178 , G10L19/02 , G10L21/02 , H03G3/32 , H04R25/00 , H04R27/00 , H04B15/00
CPC分类号： G10L21/0208 , G10K11/1782 , G10K2210/108 , G10K2210/3011 , G10K2210/3012 , G10K2210/3023 , H04R2225/43 , H04R25/505
摘要： An improved background noise estimator (320) is disclosed for use with a noise suppression system (300) for generating an estimate of the background noise power spectral density provided to noise suppressor (310), which performs speech quality enhancement upon the pre-processed speech-plus-noise signal available at the input to generate a clean post-processed speech signal at the output. Background noise estimator (320) utilizes an energy valley detector based upon post-processed speech to perform the speech/noise classification, and a noise spectral estimator based upon pre-processed speech to generate an estimate of the background noise power spectral density. As a result, the background noise estimate supplied to the noise suppressor is a more accurate measurement of the background noise energy, since it is performed during a more accurate determination of the occurrences of pauses in the speech.
摘要翻译：公开了改进的背景噪声估计器（320），用于与噪声抑制系统（300）一起使用，用于产生提供给噪声抑制器（310）的背景噪声功率谱密度的估计，其对预处理语音执行语音质量增强在输入端可用的-plus-noise信号在输出端产生干净的后处理语音信号。背景噪声估计器（320）利用基于后处理语音的能量谷检测器来执行语音/噪声分类，以及基于预处理语音的噪声谱估计器，以产生背景噪声功率谱密度的估计。结果，提供给噪声抑制器的背景噪声估计是背景噪声能量的更精确的测量，因为它在更准确地确定语音中的暂停的发生时执行。

10. 发明授权

US4628529A Noise suppression system 失效
标题翻译：噪声抑制系统
公开(公告)号：US4628529A
公开(公告)日：1986-12-09
申请号：US750942
申请日：1985-07-01
申请人： David E. Borth , Ira A. Gerson , Richard J. Vilmur
发明人： David E. Borth , Ira A. Gerson , Richard J. Vilmur
IPC分类号： G10L21/02 , H04R25/00 , H04R27/00 , H04B15/00
CPC分类号： G10L21/0208 , H04R2225/43 , H04R25/505
摘要： An improved noise suppression system (400) is disclosed which performs speech quality enhancement upon speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The noise suppression system of the present invention includes a background noise estimator (420) which generates and stores an estimate of the background noise power spectral density based upon pre-processed speech (215), as determined by the detected minima of the post-processed speech energy level. This post-processed speech (255) may be obtained directly from the output of the noise suppression system, or may be simulated by multiplying the pre-processed speech energy (225) by the channel gain values of the modification signal (245). This technique of implementing post-processed signal to generate the background noise estimate (325) provides a more accurate measurement of the background noise energy since it is based upon much cleaner speech signal. As a result, the present invention performs acoustic noise suppression in high ambient noise backgrounds with significantly less voice quality degradation.
摘要翻译：公开了一种改进的噪声抑制系统（400），其通过在输入端（205）处可用的语音加噪声信号来执行语音质量增强，以通过频谱增益修改在输出端（265）产生干净的语音信号。本发明的噪声抑制系统包括背景噪声估计器（420），该背景噪声估计器（420）根据检测到的后处理的最小值来确定基于预处理语音（215）的背景噪声功率谱密度的估计言语能量水平。该后处理语音（255）可以直接从噪声抑制系统的输出获得，或者可以通过将预处理的语音能量（225）乘以修改信号（245）的信道增益值来模拟。实现后处理信号以产生背景噪声估计的这种技术（325）提供背景噪声能量的更精确的测量，因为它基于更清洁的语音信号。结果，本发明在高环境噪声背景下执行噪声抑制，语音质量降低明显减少。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式