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1.发明授权Anti-larsen-effect arrangement in a telephone station equipped with a loudspeaker 失效在配有扬声器的电话台中进行防扩散效应布置
公开(公告)号：US4484034A
公开(公告)日：1984-11-20
申请号：US500799
申请日：1983-06-07
CPC分类号： H04M9/08
摘要： An anti-Larsen circuit for a telephone station in which the listening channel comprises an automatic listening level control circuit, suitably of the type comprising a variable attenuator circuit, a pulse-width modulator and a threshold detector which supplies compression pulses. The transmission channel comprises a circuit for rendering the transmission channel operative or inoperative and also a control circuit. Actuation takes place above a sound-level threshold S.sub.1 and a de-activation below a sound-level threshold S.sub.2 which is smaller than S.sub.1.
摘要翻译： 一种用于电话台的反拉森电路，其中听音通道包括自动聆听电平控制电路，适合于包括可变衰减器电路，脉冲宽度调制器和提供压缩脉冲的阈值检测器的类型。 传输信道包括用于使传输信道操作或不起作用的电路，以及控制电路。 在声级阈值S1之上进行动作，并且在小于S1的声级阈值S2之下进行去激活
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公开(公告)号：US4386236A
公开(公告)日：1983-05-31
申请号：US244359
申请日：1981-03-16
CPC分类号： H03K7/08 , H03G3/20 , H04M1/6033
摘要： This arrangement comprises a controllable attenuation circuit of the voice signal received, a pulse-duration modulator which produces pulses the duration of which is modulated by the voice signal supplied by the controllable attenuation circuit, an overshoot detection circuit which produces from the modulated pulses a compression pulse each time it is detected that the amplitude of the modulated voice signal reaches a certain threshold, the compression signal produced by the said overshoot detection circuit being applied in the attenuation circuit to an integrating circuit which produces the attenuation control signal. The amplifier of the loudspeaker receives the modulated signal.
摘要翻译： 这种布置包括接收到的语音信号的可控衰减电路，脉冲持续时间调制器，产生其持续时间由可控衰减电路提供的语音信号调制的脉冲，过冲检测电路从调制脉冲产生压缩 每当检测到调制语音信号的幅度达到一定阈值时，由所述过冲检测电路产生的压缩信号被施加到衰减电路中，以产生衰减控制信号的积分电路。 扬声器的放大器接收调制信号。
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3.发明授权Statistic coding arrangement for producing code words comprising a variable number of bits 失效用于生成包含可变数量位数的代码字的统计编码安排
公开(公告)号：US5062125A
公开(公告)日：1991-10-29
申请号：US389721
申请日：1989-08-04
CPC分类号： H03M7/42
摘要： This arrangement has an input (10) for receiving the information to be encoded in the form of fixed words comprising a number of bits, a first transcoding member (20) for applying said variable word to "n" outputs among n parallel outputs, a second transcoding member (22) for supplying from its output the indication of the length (n), and an accumulation member (30) for forming a first "modulo N" accumulated information and a second "modulo 2N" accumulated information, which are the result of operations performed on "n". A cyclic permutation circuit (32) supplies a permuted word which represents the permuted variable code word as a function of the first accumulated information, switching circuit (35) selectively transfers as a function of the second accumulated information the bits of the permuted word to a first and/or to a second register, and detection circuit (30,45) cooperates with the accumulation member for detecting the fill level of one of said registers to act on the transfer circuit so as to transfer the content of the filled register to the output.
摘要翻译： 这种布置具有用于以包括多个位的固定字的形式接收要编码的信息的输入端（10），用于将所述可变字应用于n个并行输出中的“n”个输出的第一代码转换部件（20）， 用于从其输出端提供长度（n）的指示的第二代码转换构件（22），以及用于形成第一“模N”累积信息和第二“模2N”累积信息的累加构件（30） 对“n”执行操作的结果。 循环置换电路（32）提供表示作为第一累积信息的函数的置换的可变码字的置换字，切换电路（35）根据第二累积信息选择性地传送置换字的位到 第一和/或第二寄存器，并且检测电路（30,45）与累积部件配合，用于检测所述寄存器之一的填充电平作用在传送电路上，以便将填充寄存器的内容传送到 输出。
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