公开(公告)号：US4207528A

公开(公告)日：1980-06-10

申请号：US12090

申请日：1979-02-14

申请人： Akira Sawai

发明人： Akira Sawai

IPC分类号： H04L25/40 ,  H04L7/00 ,  H04L7/02 ,  H04L7/027 ,  H04L7/033 ,  H04L25/497 ,  H04L25/60 ,  H03K11/00 ,  H04B3/36

CPC分类号： H04L7/0062 ,  H04L7/027

摘要： A timing-phase control system provided on the receiving side of a duobinary transmission system is adaptable to high-speed PCM repeater systems using a wide-band transmission medium such as a coaxial cable. The system includes a discriminating and regenerating circuit for recovering the transmitted digital signal by discriminating and regenerating in an appropriate timing phase based on an input equalized duobinary waveform, a phase varying circuit for varying the phase of a timing signal externally supplied to the discriminating and regenerating circuit, and a derivative waveform generating circuit. In one embodiment, the derivative waveform generating circuit is responsive to the output of the discriminating and regenerating circuit, and a multiplier multiplies the output of the derivative waveform generating circuit and the equalized duobinary waveform by each other in a predetermined phase relationship. In another embodiment, the derivative waveform generating circuit differentiates the equalized duobinary waveform on a time scale, and a multiplier multiplies the output of this differentiating circuit and that of the discriminating and regenerating circuit in a predetermined phase relationship. In either case, a low-pass amplifier amplifies the output of the multiplier to provide, with a suitable D.C. offset, a negative feedback signal to the phase varying circuit.

摘要翻译： 在双二进制传输系统的接收侧设置的定时相位控制系统适用于使用诸如同轴电缆的宽带传输介质的高速PCM中继器系统。 该系统包括识别和再生电路，用于基于输入的均衡二进制波形在适当的定时相位中鉴别和再生来恢复所发送的数字信号;相变电路，用于改变外部提供给识别和再生的定时信号的相位 电路和导数波形发生电路。 在一个实施例中，导数波形发生电路响应鉴别和再生电路的输出，乘法器将导数波形发生电路的输出和均衡的双二进制波形以预定的相位关系彼此相乘。 在另一实施例中，微分波形发生电路使均衡的双二进制波形在时间尺度上进行微分，并且乘法器将该微分电路的输出与鉴别和再生电路的输出以预定的相位关系相乘。 在任一种情况下，低通放大器放大乘法器的输出，以将适当的直流偏移提供给相变电路的负反馈信号。

公开(公告)号：USD297595S

公开(公告)日：1988-09-13

申请号：US781055

申请日：1985-09-27

申请人： Akira Sawai

设计人： Akira Sawai

公开(公告)号：US4025730A

公开(公告)日：1977-05-24

申请号：US642822

申请日：1975-12-22

申请人： Akira Sawai

发明人： Akira Sawai

IPC分类号： H04M11/00 ,  H04J1/02 ,  H04L27/26 ,  H04Q1/457 ,  H04M1/50

CPC分类号： H04Q1/457

摘要： A multifrequency signal receiver for an in-band audio frequency signalling system uses Discrete Fourier Transform or Fast Fourier Transform processing techniques or a combination of both to reliably detect which signalling frequencies have been received. The system has the advantages of digital signal processing without the scale of arithmetic functions ordinarily associated with such processing.

摘要翻译： 用于带内音频信号系统的多频信号接收机使用离散傅立叶变换或快速傅立叶变换处理技术或两者的组合来可靠地检测已经接收到哪些信号频率。 该系统具有数字信号处理的优点，没有通常与这种处理相关联的算术功能的规模。