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热词
    • 3. 发明授权
    • Electronic circuit capable of stably keeping a frequency during presence
of a burst
    • 能够在存在突发时稳定地保持频率的电子电路
    • US4633510A
    • 1986-12-30
    • US687343
    • 1984-12-28
    • Fumiaki SuzukiToshiyuki TakedaTakeo InoueShigeo Nakajima
    • Fumiaki SuzukiToshiyuki TakedaTakeo InoueShigeo Nakajima
    • H03L7/14H04B1/40H04B7/15H04B7/155H04B1/00
    • H04B1/40H03L7/14
    • In a radio communication system, a transmitting section of a substation comprises a controlling circuit (21) for controlling a carrier frequency of a local oscillator (24) in response to a frequency deviation signal. A burst generating circuit (26) generates a burst in response to the input signal, a burst control signal, and a local oscillation signal of the carrier frequency. The transmitting section further comprises a holding circuit (34) responsive to a frequency control signal and the burst control signal. During presence of the burst control signal, the holding circuit holds the frequency control signal received before a beginning of the burst control signal to keep the carrier frequency of the local oscillation signal invariable until an end of the burst control signal. Otherwise, the frequency control signal passes through the holding circuit as it stands. Consequently, the carrier frequency of the local oscillation signal is controlled only during absence of the input signal and is kept invariable during presence of the input signal.
    • 在无线电通信系统中,变电站的发送部分包括用于响应于频率偏差信号来控制本地振荡器(24)的载波频率的控制电路(21)。 突发发生电路(26)响应于输入信号,脉冲串控制信号和载波频率的本地振荡信号产生脉冲串。 发送部分还包括响应于频率控制信号和突发控制信号的保持电路(34)。 在脉冲串控制信号的存在期间,保持电路保持在突发控制信号开始之前接收到的频率控制信号,以保持本地振荡信号的载波频率不变,直到脉冲串控制信号的结束。 否则,频率控制信号就一直通过保持电路。 因此,本地振荡信号的载波频率仅在没有输入信号的情况下被控制,并且在存在输入信号的过程中保持不变。