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    • 3. 发明授权
    • CLOCK REGENERATION CIRCUIT
    • 电路中风恢复
    • EP0989706B1
    • 2008-04-23
    • EP98924555.0
    • 1998-06-10
    • Kabushiki Kaisha Kenwood
    • TADA, ShunichiSHIRAISHI, Kenichi
    • H04L27/22H04J9/00H03J7/06
    • H04L7/06H03L7/1806H04J9/00H04L27/066
    • A clock regeneration circuit for regenerating a clock signal for demodulating data from an AM data multiplex modulated signal where digitally modulated signals are multiplexed in the same frequency band as those of an amplitude-modulated signal at the same time. The carrier for an amplitude-modulated signal is extracted from an AM data multiplex modulated signal where digitally modulated signals are multiplexed in the same frequency band as those of the amplitude-modulated signal at the same time through a band-pass filter (1), and the oscillation frequency of a voltage-controlled oscillator (5) is controlled by the output of a phase comparator (3) through a loop filter (4). The oscillation output of the voltage-controlled oscillator (5) is supplied to a direct digital synthesizer (6) and the phase of the carrier extracted through the band-pass filter (1) is compared with the phase of the output of the direct digital synthesizer (6) by means of the phase comparator (3). The oscillation output of the voltage-controlled oscillator (5) is then synchronized with the carrier for the amplitude-modulated signal to produce a clock signal for demodulating data.
    • 10. 发明公开
    • Data security in multi-carrier communication systems
    • 在Mehrträger-Nachrichtens系统中的Datensicherheit。
    • EP0457602A2
    • 1991-11-21
    • EP91304443.4
    • 1991-05-17
    • FUJITSU LIMITED
    • Hinokimoto, Shinichi
    • H04L5/06H04J9/00
    • H04L9/00H04L1/0003H04L27/2608H04N1/4486
    • A secure muli-carrier system wherein the number of bits to be transmitted in each signalling interval is determined during a start-up procedure. The transmitter sends a training signal to the receiver, which evaluates the transmission quality and calculates the bit rate to be used. This information is sent back in ciphered form to the transmitter. The transmitted data are not enciphered, security being provided by the fact that the bit rate is unknown.
    • 一种多载波通信系统,其中发送机侧设备和接收机侧设备(10,11)通过传输线路(12)连接。 发送机侧装置包含用于调制数据的多载波调制器(14,14分钟),其中在每个周期中预先设定的数据位数由多个载波分别调制。 发送机侧装置将由多个载波调制单元(14,14分钟)调制的训练信号发送到接收机侧设备,其中数字被设置为等于数字的预定最大值。 接收机侧设备评估训练信号的组件的质量,其中各个载波调制分量,以确定要预设的上述数字,密码信息,并将密码信息发送给发送机侧设备。 发送机侧设备对信息进行解密以获得所确定的号码,并将其设置在其中提供的多载波解调器(16,16分钟)中。