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公开(公告)号：US4502138A
公开(公告)日：1985-02-26
申请号：US403333
申请日：1982-07-30
申请人： Akiho Doi , Norio Saneyoshi
发明人： Akiho Doi , Norio Saneyoshi
摘要： A key telephone system having a plurality of key telephone sets and a key service unit. Intercom lines connect the key service unit and the key telephone sets. A synchronizing system in each key telephone set is provided for synchronizing signal transmissions from the corresponding individual key telephone sets of the key service unit with the transmissions from the key service unit. The individual synchronizing systems receive a multiplex transmission from the key service unit and the transmission has a multiplexed frequency signal as a control signal and also has a voice signal. The control signal includes control transmission data to the synchronizing system and includes a start bit following a fixed number of signals having a binary state opposite to a binary state of the start bit. Circuitry is provided including a high pass filter which removes the voice signal and for converting the frequency shift signal free of the voice signal to the transmission data control signal with control transmission data. Detection circuitry detects the reception of the start bit and develops an output and other circuitry receives the output and determines it is a synchronizing signal and develops a reset pulse. A shift clock pulse generator receives the reset pulse and develops output timing shift clock pulses effecting synchronization of transmissions between the key service unit and the corresponding key telephone set.
摘要翻译： 一种具有多个密钥电话机和密钥服务单元的密钥电话系统。 对讲线连接关键服务单元和关键电话机。 提供每个密钥电话机中的同步系统，用于使来自密钥服务单元的相应单独密钥电话机的信号传输与来自密钥服务单元的传输同步。 各个同步系统从密钥服务单元接收复用传输，并且传输具有复用的频率信号作为控制信号，并且还具有语音信号。 控制信号包括到同步系统的控制传输数据，并且包括具有与起始位的二进制状态相反的二进制状态的固定数目的信号之后的起始位。 提供了包括高通滤波器的电路，该高通滤波器除去语音信号，并且将具有语音信号的频移信号转换为具有控制传输数据的传输数据控制信号。 检测电路检测起始位的接收并产生输出，其他电路接收输出并确定其是同步信号并产生复位脉冲。 移位时钟脉冲发生器接收复位脉冲并产生输出定时移位时钟脉冲，从而实现密钥服务单元和对应的密钥电话机之间传输的同步。
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公开(公告)号：US4490820A
公开(公告)日：1984-12-25
申请号：US403315
申请日：1982-07-30
申请人： Akiho Doi , Norio Saneyoshi
发明人： Akiho Doi , Norio Saneyoshi
CPC分类号： H04M9/003
摘要： A reception system for a key telephone system, in which a voice signal and a control signal having the form of a frequency shift signal are multiplexed in an intercom line for transmission. In accordance with the present invention, there is provided means for extending by a predetermined period of time the period of a first clock pulse at the time of a key service unit transfering from the transmitting state to the receiving state, so that the center of data transmitted may coincide with the readout timing for reception.The means for extending is arranged so that it may apply a reset pulse to a reset terminal of a frequency divider of an oscillator for generating the lock pulses.
摘要翻译： 一种用于密钥电话系统的接收系统，其中语音信号和具有频移信号形式的控制信号被多路复用在对讲线路中用于传输。 根据本发明，提供了一种装置，用于在密钥服务单元从传输状态转移到接收状态时将预定时间段延长第一时钟脉冲的周期，使得数据中心 发送的时间与接收的读出时刻一致。 扩展装置被布置成使得它可以将复位脉冲施加到用于产生锁定脉冲的振荡器的分频器的复位端。
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公开(公告)号：US4184053A
公开(公告)日：1980-01-15
申请号：US876414
申请日：1978-02-09
申请人： Norio Saneyoshi
发明人： Norio Saneyoshi
摘要： A ringing signal detector, which comprises a series diode clipper automatically biased by an input signal, a DC converter for converting the output of the series diode clipper to a DC level, a DC level detector for detecting the converted DC level to detect whether the input signal is a ringing signal or a dial pulse signal, thereby generating an output only when the input signal is the ringing signal.
摘要翻译： 振铃信号检测器，其包括由输入信号自动偏置的串联二极管限幅器，用于将串联二极管截止器的输出转换为DC电平的DC转换器; DC电平检测器，用于检测转换的DC电平以检测输入 信号是振铃信号或拨号脉冲信号，从而仅在输入信号为振铃信号时产生输出。
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