专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

91. 发明授权

US4253072A Compandor with sampling and equalization 失效
标题翻译： Compandor采样和均衡
公开(公告)号：US4253072A
公开(公告)日：1981-02-24
申请号：US55505
申请日：1979-07-09
申请人： Charles B. Fisher , Sidney T. Fisher
发明人： Charles B. Fisher , Sidney T. Fisher
IPC分类号： H03G7/00 , H04B1/64
CPC分类号： H03G7/008 , H04B1/64
摘要： A syllabic compandor using a pilot in the signal frequency band, with a compression ratio between approximately 2 and 20, including a frequency and delay equalizer in the negative-feedback loss-control circuits of the compressor and expandor, to permit high compression and expansion ratios without positive feedback at any frequency or signal level, the expansion ratio materially less than the compression ratio in some cases, and sampling at more than the Nyquist frequency for the signal band to remove any unwanted periodic wave such as the pilot wave, lying in the signal frequency band, from the output, without altering phase and amplitude of other waves in the signal frequency band.
摘要翻译：在压缩机和扩展器的负反馈损失控制电路中，在信号频带中使用压缩比在大约2到20之间的导频信号，包括频率和延迟均衡器，以允许高的压缩和扩展比在任何频率或信号电平下没有正反馈，在某些情况下，扩展比实质上小于压缩比，并且对于信号频带采样超过奈奎斯特频率，以去除位于信号频带，不改变信号频带中其他波的相位和幅度。

92. 发明授权

US4224581A Compander system having limiter in compressor and expander 失效
标题翻译：压缩机系统在压缩机和膨胀机中具有限制器
公开(公告)号：US4224581A
公开(公告)日：1980-09-23
申请号：US844198
申请日：1977-10-21
申请人： Hiroshi Watanabe , Kenjiro Endoh , Motokazu Ohkawa , Kazuo Kitagawa , Hideshi Kira
发明人： Hiroshi Watanabe , Kenjiro Endoh , Motokazu Ohkawa , Kazuo Kitagawa , Hideshi Kira
IPC分类号： H03G9/02 , H04B1/64 , H03G7/00
CPC分类号： H03G9/025
摘要： A noise reduction system having an encoder which compresses the dynamic range of an analog audio signal, a transmission medium coupled to the encoder, and a decoder coupled to the transmission medium for expanding and thereby restoring the dynamic range of the compressed analog audio signal. The encoder includes a voltage controlled amplifier (VCA) receiving the audio signal, a high-pass filter also coupled to the analog audio signal, a circuit for obtaining a difference between the outputs of the VCA and the high-pass filter, weighting and level sensing circuits coupled to the encoder output for sensing the level of the compressed analog audio signal, and a limiter circuit coupled to the output of the weighting and level sensing circuits and producing a control voltage applied to the VCA control input in such a manner that the ratio of the gain of the VCA and the gain of the high-pass filter at the pass band thereof does not become less than one. The decoder includes circuits similar to those of the encoder and exhibits a transfer function substantially inverse to the encoder transfer function, with the controlling voltage applied to the decoder VCA such that the loop gain in the pass band of the high-pass filter does not become more than one.
摘要翻译：一种噪声降低系统，具有压缩模拟音频信号的动态范围的编码器，耦合到编码器的传输介质和耦合到传输介质的解码器，用于扩展并由此恢复压缩的模拟音频信号的动态范围。编码器包括接收音频信号的压控放大器（VCA），还耦合到模拟音频信号的高通滤波器，用于获得VCA和高通滤波器的输出之间的差值的电路，加权和电平耦合到编码器输出的感测电路用于感测压缩的模拟音频信号的电平;以及限制器电路，耦合到加权和电平感测电路的输出，并产生施加到VCA控制输入的控制电压， VCA的增益比和通带的高通滤波器的增益的比率不会变得小于1。解码器包括与编码器类似的电路，并且具有与编码器传递函数基本相反的传递函数，其中控制电压施加到解码器VCA，使得高通滤波器的通带中的环路增益不会变为超过一个。

93. 发明授权

US4181970A Digital attenuator for compressed PCM signals 失效
标题翻译：用于压缩PCM信号的数字衰减器
公开(公告)号：US4181970A
公开(公告)日：1980-01-01
申请号：US910065
申请日：1978-05-26
申请人： Kazuto Izumi , Kazuo Izumi
发明人： Kazuto Izumi , Kazuo Izumi
IPC分类号： G06F7/00 , H03G3/00 , H03H17/00 , H04B1/64 , H04B3/20 , G06F7/39
CPC分类号： H03G3/002 , G06F7/00 , H03H17/0054 , H04B1/64 , H04B3/20
摘要： A digital attenuator is used in a Digital Echo Suppressor to attenuate a PCM signal. This is done to decrease the influence of echo caused by both long time delay and impedance mismatching at a hybrid coil.The digital attenuator attenuates the PCM signal which is compressed by .mu. Law, when an attenuation control signal generated in the digital echo suppressor is applied to the digital attenuator. It passes the PCM signal through without attenuating it when the attenuation control signal is not applied.The attenuator consists of a plurality of pattern shift circuits and an adder or plural number of adders and a selector.The principle of the attenuation is described hereinafter;The attenuation quantity is attained from Eq. 1.Pout=.alpha. Pin (1)wherePin=input PCM signal compressed by .mu. Law.Pout=attenuated output PCM signal,.alpha.=attenuation parameter which is a real number satisfying the condition 0
摘要翻译：数字衰减器用于数字回波抑制器以衰减PCM信号。这样做可以减少混合线圈长时间延迟和阻抗不匹配引起的回波的影响。当数字回波抑制器中产生的衰减控制信号被施加到数字衰减器时，数字衰减器衰减被μ法压缩的PCM信号。当不施加衰减控制信号时，PCM通过PCM信号而不使其衰减。衰减器由多个图案移位电路和加法器或多个加法器和选择器组成。下文描述衰减原理; 衰减量由公式 1. Pout = alpha引脚（1）其中Pin =由mu法压缩的输入PCM信号。 Pout =衰减输出PCM信号，α=衰减参数，其是满足条件0 <α<1的实数，α是从1/21，1/22，1/23，1/24，。。。，1 / 2n。（n：移位数）数字衰减器的特征是衰减特性根据输入的PCM信号电平而变化。

94. 发明授权

US4145664A Audio signal compression and expansion system 失效
标题翻译：音频信号压缩和扩展系统
公开(公告)号：US4145664A
公开(公告)日：1979-03-20
申请号：US892356
申请日：1978-03-31
申请人： Saburo Takaoka , Fumihiko Yokogawa , Tadahiro Yamaguchi
发明人： Saburo Takaoka , Fumihiko Yokogawa , Tadahiro Yamaguchi
IPC分类号： H04B1/62 , G11B20/04 , H03G7/00 , H03G9/02 , H04B1/64 , H03G7/08
CPC分类号： H04B1/64 , H03G9/025
摘要： The auxilliary signal path in a compander system includes, in series, a first amplifier 7, a weighting function amplifier 8, and a detection circuit 9. The output of the latter controls the gain of a voltage-controlled variable gain circuit 11 also connected to the first amplifier output, and the integrated output of the variable gain circuit is fed back to the input of the first amplifier via a subtraction circuit 13 also supplied with the auxilliary signal path input. Alternatively, the first amplifier may comprise an operational amplifier, in which case the integrated signal is directly coupled to one of its inputs.
摘要翻译：压缩扩展器系统中的辅助信号路径包括串联的第一放大器7，加权函数放大器8和检测电路9.后者的输出控制也连接到的控制可变增益电路11的增益第一放大器输出和可变增益电路的积分输出经由还具有辅助信号路径输入的减法电路13反馈到第一放大器的输入端。或者，第一放大器可以包括运算放大器，在这种情况下，集成信号直接耦合到其输入之一。

95. 发明授权

US4136314A Adaptive signal weighting system 失效
标题翻译：自适应信号称重系统
公开(公告)号：US4136314A
公开(公告)日：1979-01-23
申请号：US846722
申请日：1977-10-31
申请人： David E. Blackmer , C. Rene Jaeger
发明人： David E. Blackmer , C. Rene Jaeger
IPC分类号： H04B1/62 , G11B20/04 , G11B20/24 , H03G7/00 , H03G9/02 , H03H11/04 , H03H11/12 , H04B1/64 , H03B3/02
CPC分类号： H04B1/64 , H03G9/025
摘要： An adaptive signal weighting system for use in electrical signal transmission along a signal path comprises a variable filter disposed in the signal path having electrical transmission characteristics capable of varying in response to a first control signal the relationship between the spectral region of dominant energy in a transmitted signal relative to the other spectral regions of the transmitted signal. Frequency discrimination means senses the spectral region of dominant signal energy in the transmitted signal and provides the first control signal as a function of frequency of the dominant signal energy. Gain control means disposed in the signal path and coupled in series with the filter means provides a gain variable on the transmitted signal responsively to a second control signal. This second control signal is logarithmically related to the amplitude of the transmitted signal over at least a portion of the frequency range of the signal.

96. 发明授权

US4123711A Synchronized compressor and expander voice processing system for radio telephone 失效
标题翻译：无线电话同步压缩机和扩展器语音处理系统
公开(公告)号：US4123711A
公开(公告)日：1978-10-31
申请号：US762435
申请日：1977-01-24
申请人： Sherman M. Chow
发明人： Sherman M. Chow
IPC分类号： H03G7/00 , H04B1/64
CPC分类号： H03G7/008 , H03G7/007 , H04B1/64
摘要： The voice processing system for radio telephone consists of a compressor in the transmitter and an expander in the receiver. The compressor divides the input voice signal into syllabic groups and applies a gain to each syllabic group depending on the peak amplitude of the signal of the respective group, resulting in a reduction or compression of the dynamic range of the voice. The expander on the other hand increases or expands the dynamic range of the signal restoring the voice to its original form. The compressor and expander are synchronized such that the amount of expansion or instantaneous gain in the receiver is exactly the reciprocal of the amount of compression in the transmitter, i.e. when the gain of the compressor is N, the gain of the expander is 1/N. In this way the total system gain is always unity and is therefore transparent to voice and other analog signals passing through it. A porton of the voice frequency band is pre-empted to carry a digital signal to synchronize the compressor to the expander. This band designated as the control channel is located between 2500 to 2700 Hz and is used to carry binary frequency shift keyed (FSK) data stream which defines the instantaneous gain of the expander denoted by N. The band between 300-2500 Hz is used to carry the compressed voice. The effect of noise encountered in the transmission path is reduced because the soft syllables are amplified to the same amplitude as the loud syllables thus achieving an improved signal-to-noise ratio.
摘要翻译：用于无线电话的语音处理系统包括发射机中的压缩器和接收机中的扩展器。压缩器将输入的声音信号分成音节组，并且根据相应组的信号的峰值幅度对每个音节组施加增益，导致声音的动态范围的减小或压缩。另一方面，扩展器增加或扩展将语音恢复到其原始形式的信号的动态范围。压缩器和膨胀器被同步，使得接收器中的膨胀量或瞬时增益恰好是发送器中的压缩量的倒数，即当压缩机的增益为N时，扩展器的增益为1 / N 。以这种方式，总系统增益总是为单位，因此对通过它的语音和其他模拟信号是透明的。语音频带的端口被预先携带数字信号以将压缩器同步到扩展器。指定为控制信道的频带位于2500至2700Hz之间，并用于携带限定由N表示的扩展器的瞬时增益的二进制频移键控（FSK）数据流。将300-2500Hz之间的频带用于携带压缩声音。由于软音节被放大到与扬声音节相同的幅度，所以在传输路径中遇到的噪声的影响减小，从而达到提高的信噪比。

97. 发明授权

US4112254A Signal compander system 失效
标题翻译：信号压缩机系统
公开(公告)号：US4112254A
公开(公告)日：1978-09-05
申请号：US842465
申请日：1977-10-17
申请人： David E. Blackmer
发明人： David E. Blackmer
IPC分类号： H03G9/02 , H04B1/64 , H04B3/04
CPC分类号： H04B1/64 , H03G9/025
摘要： An improved signal conditioning compander system includes one or more weighting networks designed so that the system provides a substantially flat single-frequency sine wave sweep response through or on the transmission medium throughout the frequency bandwidth of interest.The system provides greater high-frequency weighting than heretofore practical and at the same time permits full level transmission over the entire frequency spectrum transmitted or recorded.
摘要翻译：改进的信号调理压缩扩展器系统包括一个或多个加权网络，其被设计为使得系统通过感兴趣的频率带宽中的或在传输介质上提供基本平坦的单频正弦波扫描响应。

98. 发明授权

US4072914A Compression and expansion system with enlarged dynamic range 失效
标题翻译：压缩扩张系统具有动态范围扩大
公开(公告)号：US4072914A
公开(公告)日：1978-02-07
申请号：US681255
申请日：1976-04-28
申请人： Yutaka Haramoto , Kazunori Nisikawa , Masami Yamazaki
发明人： Yutaka Haramoto , Kazunori Nisikawa , Masami Yamazaki
IPC分类号： H04B1/62 , G11B20/04 , H03G7/00 , H03G9/02 , H04B1/64
CPC分类号： H03G9/025 , H03G7/004 , H04B1/64
摘要： A compression and expansion system comprises a control circuit including a variable impedance element, whose impedance is varied in accordance with a control signal applied thereto. The system has a frequency-response characteristic which varies in accordance with variation of the impedance of the variable impedance element. A control signal is formed in accordance with the level of an input signal and is applied to the variable impedance element of the control circuit thereby to vary the impedance thereof. A switching means forms passing paths in a manner such that, at the time of compressing, the input signal is supplied by way of the control circuit to a negative feedback amplifier. At the time of expanding, the input signal is supplied to the negative feedback amplifier, and, at the same time, the output of the negative feedback amplifier is fed back by way of the control circuit to the input of said negative feedback amplifier. The control circuit comprises a variable high-frequency range increasing circuit which operates when the input signal level is relatively low. The control circuit increases the high-frequency component in accordance with the variation of the impedance of the variable impedance element. A variable high-frequency range decreasing circuit operates, when the input signal level is relatively high, to decrease the high-frequency component in accordance with the variation of the impedance of the variable impedance element.
摘要翻译：压缩和膨胀系统包括控制电路，该控制电路包括可变阻抗元件，其阻抗根据施加到其上的控制信号而变化。该系统具有根据可变阻抗元件的阻抗的变化而变化的频率响应特性。根据输入信号的电平形成控制信号，并施加到控制电路的可变阻抗元件，从而改变其阻抗。切换装置以这样的方式形成通路，即在压缩时，输入信号通过控制电路提供给负反馈放大器。在扩展时，输入信号被提供给负反馈放大器，并且同时，负反馈放大器的输出通过控制电路反馈到所述负反馈放大器的输入端。控制电路包括可变高频范围增加电路，其在输入信号电平相对较低时工作。控制电路根据可变阻抗元件的阻抗的变化而增加高频分量。当可变高频范围减小电路在输入信号电平相对较高时，根据可变阻抗元件的阻抗的变化来降低高频分量。

99. 发明授权

US4054849A Signal compression/expansion apparatus 失效
标题翻译：信号压缩/膨胀装置
公开(公告)号：US4054849A
公开(公告)日：1977-10-18
申请号：US701565
申请日：1976-07-01
申请人： Takaaki Yamada
发明人： Takaaki Yamada
IPC分类号： H03G7/00 , H04B1/64
CPC分类号： H03G7/004
摘要： Signal expansion/compression apparatus wherein an input signal is compressed by an exponential factor and then subsequently may be expanded by the reciprocal of that exponential factor, wherein neither the signal compression circuits nor the signal expansion circuits need be provided with exponential amplifiers or logarithmic function generators. The signal compressio circuit includes a plurality of serially-connected voltage controlled amplifiers, a first of such amplifiers receiving the input signal to be compressed and a predetermined one of such amplifiers providing the compressed output signal. A control signal generator is connected to the last of the voltage controlled amplifiers to produce a control voltage which is a function of the output signal of that last amplifier and a reference voltage. This control voltage is supplied to all of the voltage controlled amplifiers so as to determine the respective gains thereof. The signal expansion circuit includes a plurality of voltage controlled amplifiers, an input signal to be expanded being supplied in common to two of such amplifiers. An output of one of such amplifiers is combined with a reference signal to produce another control voltage which is supplied to all of the amplifiers in the signal expansion circuit so as to determine the respective gains thereof. The output signal produced by another amplifier is expanded with respect to the input signal. All of the voltage controlled amplifiers used in the compression and expansion circuits exhibit substantially linear gain characteristics and, preferably, are comprised of a voltage controlled impedance whose impedance value is linearly related to the applied control voltage.
摘要翻译：信号扩展/压缩装置，其中输入信号被指数因子压缩，然后可以通过该指数因子的倒数来扩展，其中信号压缩电路和信号扩展电路都不需要提供指数放大器或对数函数发生器。信号压缩电路包括多个串联连接的电压控制放大器，接收要压缩的输入信号的这种放大器中的第一个和提供压缩输出信号的这种放大器中的预定的一个。控制信号发生器连接到最后的压控放大器以产生作为最后一个放大器的输出信号和参考电压的函数的控制电压。该控制电压被提供给所有的压控放大器，以便确定其各自的增益。信号扩展电路包括多个压控放大器，要扩展的输入信号被共同地提供给两个这样的放大器。这些放大器中的一个的输出与参考信号组合，以产生另一个控制电压，该控制电压被提供给信号扩展电路中的所有放大器，以便确定其各自的增益。由另一放大器产生的输出信号相对于输入信号而扩展。在压缩和扩展电路中使用的所有压控放大器都显示出基本线性的增益特性，并且优选地包括其阻抗值与所施加的控制电压线性相关的压控阻抗。

100. 发明授权

US4038652A Digital communications line terminal compacter/expander 失效
标题翻译：数字通信线路终端控制器/扩展器
公开(公告)号：US4038652A
公开(公告)日：1977-07-26
申请号：US469265
申请日：1974-05-13
申请人： Steven J. Schippers
发明人： Steven J. Schippers
IPC分类号： H03M7/30 , G06F3/00 , G06F5/00 , H04B1/00 , H04B1/64 , H04B1/66 , H04L20060101 , H04L23/00 , H04L25/49
CPC分类号： H03M7/40
摘要： A system of encoding a fixed-level character format for transmission in a format of variable or multi-level character lengths is disclosed. A fixed-level character format, e.g., an 8-bit character length of high to low ordered bits 2.sup.7 - 2.sup.0, received by a transmitting communications line terminal from an associated processor at a transmitting site is examined, a "Short" bit 2.sup.S is generated, and depending upon the number of higher order bits that are O bits and whether the remaining bits are an odd or an even number of 1 bits, a new variable or multi-level character is generated and transmitted on the communications line along with the associated "Short" bit. The reverse procedure is utilized at the receiving communications line terminal to regenerate the fixed-level character format utilized by the associated processor at the receiving site. Through a statistical analysis of the frequency of transmission of individual characters of the fixed-level character format that is used by the processors the most frequently used characters are transmitted in a shortened form such that total message block transmission time is substantially reduced.
摘要翻译：公开了以可变或多级字符长度的格式进行传输的固定级别字符格式的编码系统。检查由发送通信线路终端从发送站点处的相关联的处理器接收的固定电平字符格式，例如从高到低有序位27-20的8位字符长度，“短”位2S是并且根据作为0比特的高阶比特的数目以及剩余比特是奇数还是偶数1比特，生成新的可变或多级字符并在通信线路上发送关联“短”位。在接收通信线路终端处使用相反的过程来再生在接收站点处由相关联的处理器使用的固定级字符格式。通过对处理器使用的固定级别字符格式的个别字符的传输频率的统计分析，以最短的形式发送最常用的字符，从而大大减少总消息块传输时间。

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