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    • 31. 发明专利
      JPS5958945A System for detecting non-signal time band 失效
    • System for detecting non-signal time band
    • 用于检测非信号时间带的系统
    • JPS5958945A
    • 1984-04-04
    • JP16998982
    • 1982-09-28
    • Fujitsu Ltd
    • IKUTA KOUJI , AOKI KOUJI , YAMADA HIROSHI , WATANABE NAOKI
    • H04L25/02 , H04L1/20
    • H04L1/20
    • PURPOSE:To reduce the detecting timer, by providing a circuit detecting a non- signal time band continuous for a prescribed time to a receiving section receiving a multi-value transmission signal so as to detect a non-signal by an output of the detecting circuit. CONSTITUTION:A low frequency component of a receiving signal transmitted is extracted at a low frequency filter 1, amplified at an amplifier 2 and a signal having a prescribed level in a specified frequency band is inputted to a sample signal extracting section 3. The extracting section samples a receiving signal at a prescribed period, converts an analog signal into a digital signal at an A/D converter 5, a prescribed digital signal is obtained and inputted to a detecting circuit 4. The detecting circuit 4 consists of a non-signal level detecting circuit 4-1, AND circuit 4-2, counter 4-3, and a set/reset flip-flop circuit 4-4; the non- signal level detecting circuit 4-1 is operated by detecting the non-signal, and the circuit 4-4 outputs ''0'' when the number of times of the non-signals reach a prescribed value, representing the non-signal.
    • 目的：为了减少检测定时器，通过向接收到多值传输信号的接收部分提供检测到一段规定时间内的非信号时间带的电路，以便通过检测电路的输出来检测非信号 。 构成：在低频滤波器1提取发送的接收信号的低频分量，在放大器2放大，并将具有指定频带的规定电平的信号输入到采样信号提取部3.提取部 在规定时间内对接收信号进行采样，将模拟信号转换为A / D转换器5的数字信号，获得规定的数字信号并将其输入到检测电路4.检测电路4由非信号电平 检测电路4-1，AND电路4-2，计数器4-3以及置位/复位触发器电路4-4; 通过检测非信号来操作非信号电平检测电路4-1，当非信号的次数达到规定值时，电路4-4输出“0” 信号。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 32. 发明专利
      JPS57196650A MULTI-VALUE TRANSMISSION SYSTEM 失效
    • MULTI-VALUE TRANSMISSION SYSTEM
    • JPS57196650A
    • 1982-12-02
    • JP8174081
    • 1981-05-28
    • FUJITSU LTD
    • IKUTA KOUJI , WATANABE NAOKI
    • H03M5/04 , H04L25/49
    • PURPOSE:To obtain multi-value transmission with simple constitution and high reliability, by the automatic control of an AGC amplifying section so that a multi-value signal from a multi-value generating section is almost a constant transmission level independently of the change in the multi-value. CONSTITUTION:A multi-value generating section 1 converts binary information into a multi-value signal and can change the multi-value. The multi-value signal from the section 1 is applied to an AGC amplifying section 3 via an LPF2. The section 3 makes gain control with an average value AGC, for example. If inputted binary information is converted into a 6-value signal at the section 1 for output, and if the signal is changed to a 4-value signal through the deterioration of line condition, although the transmission level is lowered by 3.7dB, the control is made by the AGC function that the transmission level can almost be kept to the same level as the case with the level of the 6-value signal. At a reception side, the received 4-value signal is controlled so that the level is the same as that from the section 1, allowing to discriminate the 4-value signal through threshold levels TH1-TH3.
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
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