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2. 发明公开

EP0989706A1 CLOCK REGENERATION CIRCUIT 失效
标题翻译： SCHALTUNG ZUR TAKTWIEDERHERSTELLUNG
公开(公告)号：EP0989706A1
公开(公告)日：2000-03-29
申请号：EP98924555.0
申请日：1998-06-10
申请人： KABUSHIKI KAISHA KENWOOD
发明人： TADA, Shunichi , SHIRAISHI, Kenichi
IPC分类号： H04L27/22 , H04J9/00
CPC分类号： H04L7/06 , H03L7/1806 , H04J9/00 , H04L27/066
摘要： 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.
摘要翻译：一种时钟再生电路，用于再生时钟信号，用于从AM数据多路复用调制信号中解调数据，其中数字调制信号被同时被调制信号与幅度调制信号复用在同一频带。调幅信号的载波从AM数据多路复用调制信号中提取，其中数字调制信号通过带通滤波器（1）同时被调制信号与幅度调制信号在同一频带中被多路复用，并且通过环路滤波器（4）通过相位比较器（3）的输出来控制压控振荡器（5）的振荡频率。压控振荡器（5）的振荡输出被提供给直接数字合成器（6），并且将通过带通滤波器（1）提取的载波的相位与直接数字合成器（6）的输出相位进行比较合成器（6）通过相位比较器（3）。然后，压控振荡器（5）的振荡输出与幅度调制信号的载波同步，以产生用于解调数据的时钟信号。

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