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公开(公告)号：KR1019910000652B1
公开(公告)日：1991-01-31
申请号：KR1019870014079
申请日：1987-12-10
Abstract: The method comprises a first step for eliminating dial tone utilizing a filter (30) for detecting and discriminating efficient digit tone, a second step for modulating signal sampled by 8KHz descend sampling to 4KHz sampled signal, a third step for dividing sampled signal into high frequency band and low frequency band group digit tone, a fourth step for analyzing autocorelation of the digit tone, and a fifth step for transmitting result of signal detecting by deciding existancy of signal and frequency of signal.
Abstract translation: 该方法包括：利用滤波器（30）消除拨号音的第一步骤，用于检测和识别有效数字音调;第二步骤，用于将通过8KHz下降采样采样的信号调制到4KHz采样信号;第三步骤，用于将采样信号分频为高频 频带和低频带组数字音，用于分析数字音的自相关的第四步骤，以及通过决定信号的存在和信号的频率来发送信号检测结果的第五步骤。
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公开(公告)号：KR1019900007705B1
公开(公告)日：1990-10-18
申请号：KR1019870014186
申请日：1987-12-11
IPC: H04M3/00
Abstract: The system for providing various signal services in the electronic telephone exchanger includes a controller connected to a switch network. A common signal service circuit (30) is centralised by a protocol processor (32) controlling the signal services like R2 MFC, DTMF, continuity check tone, and audio signal tone, and a real time processors (33-36) exchanging messages to peripheral devices through the switch network for connecting the signal service to a call process control routine of a call processor (31).
Abstract translation: 用于在电子交换机中提供各种信号服务的系统包括连接到交换机网络的控制器。 公共信号服务电路（30）由控制诸如R2MFC，DTMF，连续性校验音和音频信号音的信号服务的协议处理器（32）集中，并且实时处理器（33-36）向外围设备交换消息 通过交换网络将信号服务连接到呼叫处理器（31）的呼叫处理控制例程。
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Patent Agency Ranking
公开(公告)号：KR100450397B1
公开(公告)日：2004-09-30
申请号：KR1020010078868
申请日：2001-12-13
Applicant: 한국전자통신연구원
IPC: H04L7/00
CPC classification number: H04L12/413 , H04L12/40013
Abstract: Disclosed is a carrier sense (CS) apparatus for data communication. The carrier sense apparatus for data communication detects a start time point and an end time point of a reception frame using a power threshold value and a time threshold value of a preset signal to recognize a length of the reception frame at a modem receiver for data communication. The apparatus includes a power converter for converting a voltage value of an input signal into a power value; a power accumulator for accumulating the power value for a prescribed window interval; a power threshold comparator for comparing an accumulated power value generated from the power accumulator with a predetermined power threshold value, and generating the result value; and a time threshold comparator for counting a predetermined time for which the result value generated from the power threshold comparator is continuously maintained, and determining whether the counted time exceeds a predetermined time threshold value. Therefore, the apparatus considers a threshold value in view of two aspects being time and power, and effectively detects accurate start and end time points of a reception frame under a poor channel environment without increasing the load on hardware.
Abstract translation: 公开了一种用于数据通信的载波侦听（CS）装置。 用于数据通信的载波侦听设备使用预设信号的功率阈值和时间阈值来检测接收帧的开始时间点和结束时间点，以识别用于数据通信的调制解调器接收器处的接收帧的长度 。 该设备包括：功率转换器，用于将输入信号的电压值转换为功率值; 蓄电器，用于累积规定窗口间隔的功率值; 功率阈值比较器，用于将从蓄电器产生的累积功率值与预定功率阈值进行比较，并产生结果值; 以及时间阈值比较器，用于对持续维持从功率阈值比较器产生的结果值的预定时间进行计数，并且确定所计数的时间是否超过预定时间阈值。 因此，考虑到两个方面是时间和功率，该装置考虑阈值，并且在不增加硬件负荷的情况下有效地检测在不良信道环境下的接收帧的精确开始和结束时间点。
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公开(公告)号：KR1019900007713B1
公开(公告)日：1990-10-18
申请号：KR1019870014040
申请日：1987-12-09
Abstract: The R2 signal information communicating between two exchangers follows the continuous confirmation procedure so that ther direction of receiving multi-frequency signal could be acknowledged in advance. A digital signal processor (DSP) as a digital filter calculates six frequency spectrums selected from the forward and backward directions after receiving the directional information from the superior microprocessor. The calculated signal and the preset reference value are compared to detect the proper signal so that the processing capability of the digital filter is extended up to 50% and the signal detecting time is improved.
Abstract translation: 在两个交换机之间通信的R2信号信息遵循连续确认过程，从而可以预先确认接收多频信号的方向。 作为数字滤波器的数字信号处理器（DSP）在从上位微处理器接收到定向信息之后，计算从前向和后向选择的六个频谱。 比较计算出的信号和预设的参考值，以检测适当的信号，使数字滤波器的处理能力提高到50％，提高信号检测时间。
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