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    • 22. 发明授权
    • Automatic bit rate control circuit
    • 自动比特率控制电路
    • US07936842B2
    • 2011-05-03
    • US10543656
    • 2005-02-16
    • Shunji KimuraTomoaki YoshidaKoji KitaharaHiroshi Takada
    • Shunji KimuraTomoaki YoshidaKoji KitaharaHiroshi Takada
    • H04L27/08
    • H04B10/6931H03F3/087H03G3/3084H04L25/0262
    • A bit-rate automatic control circuit for feedback controlling the gain and bandwidth of a preamplifier in dependence on the bit-rate of a signal is disclosed. The circuit includes a bit-rate discrimination circuit configured to discriminate the bit rate of the signal, and an alarm circuit configured to determine whether the value of received power of the signal is less than the minimum acceptable value of the preamplifier or not. If said alarm circuit determines that the value of received power of the signal is less than the minimum acceptable value of the preamplifier, the bit-rate automatic control circuit determines, irrespective of the discrimination of said bit-rate discrimination circuit, that the bit-rate of the signal is low, and feedback controls the preamplifier based on the determination. According to the above arrangements, if a determination is made that the reception level of the input signal is lower than the minimum acceptable value of received power, the preamplifier can be switched from a state for receiving a high bit-rate signal to a state for receiving a low bit-rate signal.
    • 公开了一种用于根据信号比特率反馈控制前置放大器的增益和带宽的比特率自动控制电路。 电路包括:比特率鉴别电路,被配置为鉴别信号的比特率;以及报警电路,被配置为确定信号的接收功率的值是否小于前置放大器的最小可接受值。 如果所述报警电路确定信号的接收功率的值小于前置放大器的最小可接受值,则比特率自动控制电路确定与所述比特率鉴别电路的鉴别无关, 信号速率低,反馈控制前置放大器基于该判定。 根据上述配置,如果确定输入信号的接收电平低于接收功率的最小可接受值,则可以从用于接收高比特率信号的状态切换到前置放大器的状态 接收低比特率信号。
    • 23. 发明授权
    • Bit rate discrimination circuit based on a low frequency component of signal
    • 基于信号的低频分量的比特率鉴别电路
    • US07881414B2
    • 2011-02-01
    • US10546424
    • 2005-02-16
    • Shunji KimuraTomoaki YoshidaKoji KitaharaHiroshi Takada
    • Shunji KimuraTomoaki YoshidaKoji KitaharaHiroshi Takada
    • H04B17/00
    • H03K5/086H04L25/0262
    • A bit-rate discrimination circuit for determining which bit-rate an input signal has, a first bit-rate or a second bit-rate higher than the first bit-rate, is disclosed. The circuit is characterized by a frequency selection unit configured to filter out a signal having the second bit-rate, and allow at least a fraction of the low frequency component of a signal having the first bit-rate to pass through; a determination unit configured to determine whether the fraction of the low frequency component of the signal having the first bit-rate has passed through said frequency selection unit; a smoothing unit configured to smooth the output of said determination unit; and a level conversion unit configured to convert the output of said smoothing unit to a logic level. According to the above arrangements, the bit-rate of the input signal can be discriminated based on the low frequency component thereof.
    • 一种比特率鉴别电路,用于确定输入信号具有哪个比特率,比第一比特率高的第一比特率或第二比特率。 该电路的特征在于,频率选择单元被配置为滤除具有第二比特率的信号,并且允许具有第一比特率的信号的低频分量的至少一部分通过; 确定单元,被配置为确定具有第一比特率的信号的低频分量的分数是否已经通过所述频率选择单元; 平滑单元,被配置为平滑所述确定单元的输出; 以及电平转换单元,被配置为将所述平滑单元的输出转换为逻辑电平。 根据上述配置,可以基于其低频分量来区分输入信号的比特率。