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31.发明授权
公开(公告)号：US4843621A
公开(公告)日：1989-06-27
申请号：US182810
申请日：1988-04-18
申请人： Bryan A. Potratz
发明人： Bryan A. Potratz
CPC分类号： H04M9/085
摘要： A mobile radiotelephone (120) includes a microcomputer (220), speakerphone control circuitry (106) and mobile radio (112). In the transmit voice path, speakerphone control circuitry (106) includes switch (201), variable gain amplifier (202), compressor amplifier (203), switch (204), variable gain amplifier (205), and two registers (212-213). In the receive voice path, speakerphone control circuitry (106) includes variable gain amplifier (232), expander amplifier (233), switch (234), variable gain amplifier (235), switch (236) and two registers (216-217). Speakerphone control circuitry (106) also includes rectifier/filter (224), a companding analog-to-digital (A/D) converter (225), two latches (218-219), rectifier/filter (226) and two registers (214-215). Microcomputer (220) accesses registers (212-217) by means of a data bus (222) including address, control and data lines. Microcomputer (220) utilizes digital samples from A/D converter (225) to dynamically detect acoustic feedback and to continuously generate and store in its memory an envelope signal and a valley signal for the transmit and receive voice paths for controlling voice path gain switching. In order to determine when to switch gain between the voice paths, microcomputer (220) compares the envelope signal to the valley signal to detect the presence of voice signals and, if the voice signals are detected for a pre-selected time, the gain of the path in which voice signals have been detected is increased and the gain of the other path is decreased.
摘要翻译： 移动无线电话机（120）包括微型计算机（220），扬声器电话控制电路（106）和移动无线电（112）。 在发送语音路径中，扬声器控制电路（106）包括开关（201），可变增益放大器（202），压缩器放大器（203），开关（204），可变增益放大器（205）和两个寄存器（212-213 ）。 在接收语音路径中，扬声器控制电路（106）包括可变增益放大器（232），扩展器放大器（233），开关（234），可变增益放大器（235），开关（236）和两个寄存器（216-217） 。 扬声器控制电路（106）还包括整流器/滤波器（224），压扩式模数（A / D）转换器（225），两个锁存器（218-219），整流器/滤波器（226）和两个寄存器 214-215）。 微计算机（220）通过包括地址，控制和数据线的数据总线（222）访问寄存器（212-217）。 微计算机（220）利用来自A / D转换器（225）的数字样本来动态地检测声反馈，并且在其存储器中连续地生成并存储用于发送和接收话音路径的包络信号和谷信号，以控制语音路径增益切换。 为了确定何时在语音路径之间切换增益，微计算机（220）将包络信号与谷值信号进行比较以检测语音信号的存在，并且如果在预选时间内检测到语音信号，则增益 已经检测到语音信号的路径增加，另一路径的增益减小。
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公开(公告)号：US4489222A
公开(公告)日：1984-12-18
申请号：US417638
申请日：1982-09-13
申请人： Bruce B. Lusignan , Hamid Najafi
发明人： Bruce B. Lusignan , Hamid Najafi
IPC分类号： H04M3/30 , H03F3/393 , H04B3/23 , H04M1/03 , H04M1/26 , H04M3/06 , H04M9/10 , H04M19/00 , H04M19/02 , H04Q3/42 , H04Q3/72 , H04Q11/04 , H03K7/08 , H04B3/20
CPC分类号： H04M19/023 , H04M19/008 , H04Q11/04
摘要： A telephone line interface which performs the BORSHT functions employs pulse width modulation and eliminates dc in the transformer to reduce the size of the coupling transformer thereby reducing space and costs. The ring function is provided to the subscriber without use of mechanical relays. An automatic, dynamically adjusted hybrid network is provided for removing echo signals thereby providing major improvement in two-to-four wire conversion performance. The circuitry lends itself to large scale integration thereby reducing space and cost and improving reliability.
摘要翻译： 执行BORSHT功能的电话线接口采用脉冲宽度调制，并消除变压器中的直流，以减小耦合变压器的尺寸，从而降低空间和成本。 在不使用机械继电器的情况下，向用户提供振铃功能。 提供了自动，动态调整的混合网络，用于去除回波信号，从而提供二到四线转换性能的重大改进。 该电路适合大规模集成，从而降低空间和成本，提高可靠性。
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公开(公告)号：US4408324A
公开(公告)日：1983-10-04
申请号：US218751
申请日：1980-12-22
CPC分类号： H04J3/17
摘要： Speech signals from a plurality of channels are interpolated in a TASI system for transmission via a lesser plurality of transmission facilities, such as telephone tie-lines which carry analog voice frequency signals. Recurrently, the level of noise received via each facility is measured at a receiver of the system while the facility is idle. An average of the monitored noise levels for all facilities, which is recurrently updated, is used to control the level of a noise signal which is supplied by the receiver to each off-hook channel for which speech signals are not being received via the facilities.
摘要翻译： 来自多个信道的语音信号被插入到TASI系统中，用于经由较少的多个传输设施（诸如携带模拟语音频率信号的电话线路）传输。 经常性地，在设备空闲时，通过每个设施接收的噪声水平在系统的接收器处被测量。 用于经常更新的所有设施的监测噪声水平的平均值用于控制由接收机向通过设施未接收到语音信号的每个摘机信道提供的噪声信号的电平。
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公开(公告)号：US4400581A
公开(公告)日：1983-08-23
申请号：US203353
申请日：1980-11-03
申请人： Sava Jacobson
发明人： Sava Jacobson
CPC分类号： H04M9/10
摘要： In this incoming audio detection circuit for a speaker telephone, an impedance element is connected between the output of the microphone amplifier and the telephone line terminals. Speech signals present at each end of the impedance element are respectively rectified but not filtered. The resultant rectified but unfiltered signals are compared. If only outgoing speech is present, the rectified signal derived from the microphone amplifier end of the impendance element will be of greater magnitude than, and will have a greater phase angle extent than the rectified signal derived from the telephone line end of the impedance element. A comparator senses this condition and maintains the speaker telephone in the outgoing audio mode. In the presence of incoming speech, instants will occur when the magnitude of the rectified signal derived from the telephone line exceeds that of the rectified signal derived from the microphone amplifier. In response to this condition, the comparator causes the speaker telephone immediately to switch to the mode in which incoming speech is reproduced by a loudspeaker.
摘要翻译： 在这种用于扬声器电话的输入音频检测电路中，阻抗元件连接在麦克风放大器的输出端和电话线终端之间。 存在于阻抗元件的每一端的语音信号分别被整流而不被滤波。 比较所得到的整流但未滤波的信号。 如果仅存在传出语音，则从阻抗元件的麦克风放大器端导出的整流信号将比来自阻抗元件的电话线端的整流信号具有更大的幅度，并具有更大的相位角度。 比较器感测到这种情况，并将扬声器电话保持在输出音频模式。 在存在进入语音的情况下，当从电话线路导出的整流信号的大小超过从麦克风放大器得到的整流信号的幅度时，会出现时刻。 响应于这种情况，比较器使得扬声器电话立即切换到由扬声器再现传入语音的模式。
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公开(公告)号：US4317959A
公开(公告)日：1982-03-02
申请号：US129714
申请日：1980-03-12
申请人： Shigeya Kuriki
发明人： Shigeya Kuriki
摘要： A speech control circuit is disclosed for use in a loudspeaker telephone or a handsfree telephone having a microphone and a speaker, and provides the correct switching of the transmission mode and the reception mode in spite of acoustic coupling between the speaker and the microphone. The disclosed circuit reduces errors in the switching operation and helps to prevent the problem of "noise block".
摘要翻译： 公开了一种在具有麦克风和扬声器的扬声器电话或免提电话中使用的语音控制电路，并且尽管扬声器和麦克风之间的声耦合而提供传输模式和接收模式的正确切换。 所公开的电路减少了开关操作中的错误，并且有助于防止“噪声阻塞”的问题。
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公开(公告)号：US4293740A
公开(公告)日：1981-10-06
申请号：US180882
申请日：1980-08-25
申请人： William D. Gibb , Donald E. Clement
发明人： William D. Gibb , Donald E. Clement
CPC分类号： H04M9/10
摘要： A hands free answer feature is provided in a key telephone system which includes an intercom lead pair for providing intercommunication between key telephone station sets and a signalling path for providing audible signals via a loudspeaker circuit in the key telephone station sets. The hands free intercom feature is provided by the addition of a hybrid circuit including first and second unidirectional signal paths for coupling a.c. signals between the intercom lead pair and the signalling lead. A d.c. control signal having first and second d.c. signal states is generated on the signalling lead in response to a ratio of amplitudes of signals in the first and second signal paths being greater or lesser than a predetermined ratio. The loudspeaker circuits each include a receive signal path connected to a loudspeaker. A transmit path and path switching circuitry are added to the loudspeaker circuit. The path switching circuitry is responsive to the first and second states of the d.c. control signal to alternately activate one and the other of the transmit and receive signal paths whereby the hands free answer intercom feature is provided.
摘要翻译： 在一个关键电话系统中提供了一个免提应答功能，该电话系统包括一个内部对讲线对，用于提供关键电话机组之间的相互通信，以及用于通过密钥电话机组中的扬声器电路提供可听信号的信令路径。 通过添加包括第一和第二单向信号路径的混合电路来提供免提对讲功能，用于耦合交流电。 对讲线对和信号线之间的信号。 一个d.c. 控制信号具有第一和第二直流。 响应于第一和第二信号路径中的信号的幅度比大于或小于预定比率，在信令引导上产生信号状态。 扬声器电路各自包括连接到扬声器的接收信号路径。 发射路径和路径切换电路被添加到扬声器电路。 路径切换电路响应于直流的第一和第二状态。 控制信号交替地激活发送和接收信号路径中的一个和另一个，由此提供免提应答对讲功能。
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37.发明授权
公开(公告)号：US4268723A
公开(公告)日：1981-05-19
申请号：US72252
申请日：1979-09-04
申请人： Raymond G. Taylor
发明人： Raymond G. Taylor
CPC分类号： H04M1/585 , H04M1/6025 , H04M1/76 , H04M9/10
摘要： The loop current (I.sub.X) of a telephone set speech network (1) is automatically initialized at a desired level independent of the central office voltage applied to the input terminals (12, 13) of the set and thus independent of transmission line loop length and other variables. For this purpose, a variable conductance device (20), sush as a Darlington driver (Q1), is connected between the input terminals and the speech network so as to establish a loop current at a circuit node (N1) that is a function of the supply voltage and the conductivity of the device. The loop current is monitored, as by a Schmitt trigger circuit (30), and the conductance of the device (20) is varied accordingly so as to initialize the loop current at the desired level, as by selectively connecting a plurality of resistors (R2 . . . R7) individually and collectively between a base node (26) of the driver (Q1) and the ring lead (17) of the set.
摘要翻译： 电话机语音网络（1）的环路电流（IX）被自动初始化为期望的水平，独立于施加到该组的输入端子（12,13）的中心局电压，并且因此独立于传输线路环路长度 其他变量。 为此，作为达林顿驱动器（Q1）的可变电导装置（20）连接在输入端和语音网络之间，以便在电路节点（N1）处建立环路电流，该电路节点（N1）是 电源电压和器件的电导率。 通过施密特触发电路（30）监视回路电流，并且相应地改变器件（20）的电导，以便通过选择性地连接多个电阻器（R2）来初始化回路电流到期望的电平 ... R7）单独地和共同地在所述驱动器（Q1）的基座节点（26）和所述组件的环形引线（17）之间。
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公开(公告)号：US4165445A
公开(公告)日：1979-08-21
申请号：US862673
申请日：1977-12-21
申请人： Jorgen Brosow
发明人： Jorgen Brosow
CPC分类号： H04R3/02
摘要： This hands-free telephone prevents acoustic feedback between its speaker and microphone by attenuating either the transmission or receive path under the control of a corresponding pair of counters (computers), each counter sensing the signal divided and digitized from its corresponding path. An increase in counted pulses indicates feedback and causes a counter to more quickly reach a predetermined counter state (count), to trigger attenuation (damping) before it can be reset (restored) to zero by the other counter.
摘要翻译： 这种免提电话通过在相应的一对计数器（计算机）的控制下衰减传输或接收路径来防止其扬声器和麦克风之间的声反馈，每个计数器检测从其相应路径分割和数字化的信号。 计数脉冲的增加表示反馈，并使计数器更快速地达到预定的计数器状态（计数），以在另一个计数器将其复位（恢复）为零之前触发衰减（阻尼）。
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39.发明授权Apparatus for controlling the sound generation in the loudspeakers of intercommunicating telephone sets in response to speech signals from the microphones of said telephone sets 失效用于响应于来自所述电话机的麦克风的语音信号来控制互通电话机的扬声器中的声音产生的装置
公开(公告)号：US4123620A
公开(公告)日：1978-10-31
申请号：US802803
申请日：1977-06-02
申请人： Lars P. Karlsson
发明人： Lars P. Karlsson
CPC分类号： H04M9/085
摘要： An apparatus for controlling the generation of sound in the loudspeakers of intercommunicating telephone sets in response to pulse-code modulated speech signals from the microphones of the telephone sets. A digital comparator compares speech signals received from each microphone and delivers a binary control signal to a dividing circuit through which the speech signal having the highest maximum value passes. The dividing circuit responds to the control signal by dividing the speech signal by a desired factor. A loudspeaker, contained in the same telephone set as the microphone from which the speech signal having the highest maximum value emanated, is in circuit with a control unit. The same binary control signal causes the control unit to suppress the generation of sound in the loudspeaker.
摘要翻译： 一种用于响应于来自电话机的麦克风的脉冲编码调制语音信号来控制互通电话机的扬声器中的声音的产生的装置。 数字比较器比较从每个麦克风接收的语音信号，并将二进制控制信号传送到分频电路，通过该分频电路具有最大值的语音信号通过。 分频电路通过将语音信号除以期望的因子来响应控制信号。 包含在与麦克风相同的电话机中的具有最大最大值的语音信号的扬声器与控制单元电路连接。 相同的二进制控制信号使得控制单元抑制扬声器中的声音的产生。
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公开(公告)号：US4101735A
公开(公告)日：1978-07-18
申请号：US779486
申请日：1977-03-21
CPC分类号： H04M9/10
摘要： A handsfree telephone set uses a single transducer as microphone and speaker. A switching arrangement senses and compares the relative strength between received and transmit signals, and switches signal paths accordingly. By sensing the input of the receive path versus the output of the transmit path, the detectors are thus asymmetrically coupled, to provide a break-in capability from one side (the telephone central or calling party) only.
摘要翻译： 免提电话机使用单个传感器作为麦克风和扬声器。 切换装置感测并比较接收和发射信号之间的相对强度，并相应地切换信号路径。 通过感测接收路径的输入与发送路径的输出，因此检测器不对称地耦合，从而仅从一侧（电话中心或呼叫方）提供突破能力。
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