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    • 1. 发明授权
    • PCM signal generating/reproducing apparatus
    • PCM信号生成/再现装置
    • US4961204A
    • 1990-10-02
    • US353709
    • 1989-05-18
    • Hiromichi TanakaTakao AraiToshifumi TakeuchiSeiichi Saito
    • Hiromichi TanakaTakao AraiToshifumi TakeuchiSeiichi Saito
    • G11B20/10G11B20/18H03M13/27H04N5/928
    • H04N5/928G11B20/1809
    • A PCM signal processing apparatus for recording or reproducing a PCM signal. The PCM signal reproducing apparatus of the invention is constituted by: a data addition circuit for receiving a first signal composed of n bits per word (n being an integer) and a second signal composed of n' bits per word (n' being an integer) as mode inputs different from each other, and for adding fixed data of (n-n') bits to every word of the second signal to thereby generate a third signal; a first switch device for receiving the first and third signals and for selectively outputting one of the first and third signals; a symbol generation circuit for converting every word of the output of the first switch device into symbol data of m.times.l bits (n>l); a signal processing circuit for performing at least interleave processing, error correction code generating processing, and addition of a synchronizing signal, on the output of the symbol generation circuit, to thereby generate a first data frame; a data deletion circuit for deleting the fixed data from the first data frame of the signal processing circuit to thereby generate a second data frame; and a second switch devices for receiving the first data frame from the signal processing circuit and the second data frame from the data deletion circuit.
    • 一种用于记录或再现PCM信号的PCM信号处理装置。 本发明的PCM信号再现装置由以下部分构成:数据加法电路,用于接收由每个字n位(n为整数)组成的第一信号和由每个字n位(n'为整数)组成的第二信号 )作为彼此不同的模式输入,并且用于将(n-n')位的固定数据添加到第二信号的每个字,从而生成第三信号; 第一开关装置,用于接收第一和第三信号并选择性地输出第一和第三信号之一; 符号产生电路,用于将第一开关装置的输出的每个字转换成m×1位(n> 1)的符号数据; 信号处理电路,用于在符号生成电路的输出上执行至少交织处理,纠错码生成处理以及同步信号的相加,从而生成第一数据帧; 数据删除电路,用于从信号处理电路的第一数据帧中删除固定数据,从而生成第二数据帧; 以及用于从信号处理电路接收第一数据帧的第二开关装置和来自数据删除电路的第二数据帧。
    • 7. 发明授权
    • Digital information signal transmitting/receiving method and system
    • 数字信息发送/接收方法和系统
    • US5719943A
    • 1998-02-17
    • US409804
    • 1995-03-24
    • Nobutaka AmadaShigeru YamazakiTakaharu NoguchiHideo NishijimaHiroaki OnoHiroo OkamotoHitoaki OwashiTakao AraiYuji HatanakaSeiichi Saito
    • Nobutaka AmadaShigeru YamazakiTakaharu NoguchiHideo NishijimaHiroaki OnoHiroo OkamotoHitoaki OwashiTakao AraiYuji HatanakaSeiichi Saito
    • H04N5/926H04N5/937H04N7/52H04L9/00H04N7/167
    • H04N7/52H04N5/9261H04N5/937
    • A digital information signal transmitting/receiving method and system having a transmitter for transmitting an encrypted digital information signal and a plurality of receivers for receiving the encrypted digital information signal from the transmitter. The transmitter simultaneously distributes a plurality of identification codes associated with the receivers at a time ahead of the digital information signal. The receivers detect whether a particular identification code assigned to the receiver was included within a received plurality of identification codes. When the particular identification code has been detected as having been received the received encrypted digital information signal is decrypted into the original digital information. In order to request that a particular identification code be included so as to allow access to a program, either one of the receivers or the recorders each generate an information request signal. The transmitter is responsive to the information request signals to add to the digital information signal at a time ahead of the digital information signal, identification signals for identifying the receivers or the recorders which generated the information request signals, thereby producing a transmission signal formed of those signals, and to distribute this transmission signal to the receivers. The recorders control the received information signal to be recorded in response to the identification signals received by the receivers.
    • 一种数字信息信号发送/接收方法和系统,具有用于发送加密的数字信息信号的发射机和用于从发射机接收加密的数字信息信号的多个接收机。 发射机在数字信息信号之前的时间同时分配与接收机相关联的多个识别码。 接收机检测分配给接收机的特定识别码是否包含在所接收的多个识别码内。 当检测到特定的识别码已被接收时,接收到的加密的数字信息信号被解密成原始的数字信息。 为了请求特定的识别码被包括以允许对程序的访问,接收器或记录器中的任一个每个都生成信息请求信号。 发射机响应信息请求信号,在数字信息信号之前的时间添加数字信息信号,识别信号以识别生成信息请求信号的接收机或记录器,从而产生由那些 信号,并将该发送信号分发给接收机。 记录器响应于接收机接收到的识别信号来控制要记录的接收信息信号。
    • 10. 发明授权
    • Modem apparatus
    • 调制解调器
    • US08063768B2
    • 2011-11-22
    • US11792057
    • 2005-04-14
    • Yoshihiro AkeboshiSeiichi SaitoMitsuhiro Shimozawa
    • Yoshihiro AkeboshiSeiichi SaitoMitsuhiro Shimozawa
    • H04Q1/30
    • H04B3/56H04B2203/5483
    • Provided is a modem apparatus of power line communication using a power line as a transmission path. The modem apparatus includes: an amplifier for amplifying communication signals and outputting a differential signal obtained from a pair of output signals having a phase difference of 180 degrees therebetween; a signal transformer for applying the amplified communication signals to the power lines; and a balance circuit connected at the primary side of the signal transformer, for enhancing circuit balancing. The balance circuit is constituted by a variable element capable of changing an element value, and there is provided a common mode detecting circuit that detects a common mode current flowing through the secondary side of the signal transformer and that changes the element value of the variable element of the balance circuit such that the detected common mode current becomes small.
    • 提供了使用电力线作为传输路径的电力线通信的调制解调器装置。 调制解调器装置包括:放大器,用于放大通信信号并输出​​从具有180度相位差的一对输出信号获得的差分信号; 用于将放大的通信信号施加到电力线的信号变换器; 以及连接在信号变压器初级侧的平衡电路,用于增强电路平衡。 平衡电路由能够改变元件值的可变元件构成,并且提供了共模检测电路,其检测流过信号变压器次级侧的共模电流,并且改变可变元件的元件值 使得检测到的共模电流变小。