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公开(公告)号：US07529535B2
公开(公告)日：2009-05-05
申请号：US10555269
申请日：2004-04-29
CPC分类号： H03D1/24 , H03D1/2281 , H04L27/066 , H04N5/455
摘要： A demodulator which is arranged to demodulate a first signal with the aid of a second signal, comprises a first bandpass (30) filter arranged to recover the first signal (36) from a received signal (10) and a second bandpass filter (32) arranged to recover the second signal (30) from the received signal (10). Wherein the passband of the second bandpass filter (32) is substantially narrower than the passband of the first bandpass filter (30).
摘要翻译： 一种解调器，其被配置为借助于第二信号来解调第一信号，包括第一带通滤波器，被配置为从接收信号（10）和第二带通滤波器（32）恢复第一信号（36） 被布置成从接收信号（10）恢复第二信号（30）。 其中第二带通滤波器（32）的通带基本上比第一带通滤波器（30）的通带窄。
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2.发明授权Pulse shaping FM demodular with low noise where capacitor charge starts on input signal edge 失效脉冲整形FM解调，低噪声，电容充电在输入信号边沿开始
公开(公告)号：US5619538A
公开(公告)日：1997-04-08
申请号：US410022
申请日：1995-03-24
摘要： A receiver having, arranged in this order, an input section, an FM demodulator, to which a frequency-modulated input signal is applied, and an LF section, which FM demodulator includes a pulse shaper and a low-pass filter, the pulse shaper comprising a series arrangement of at least a load and a capacitance, the base-emitter junction of a transistor being arranged across the capacitance, and further including a switching device for charging and discharging the capacitance. The pulse shaper generates a low-noise pulse in that charging of a capacitance is started upon an edge of the input signal. The capacitance voltage is measured by a single transistor and when the transistor is turned on, the charging current of the capacitance is diverted via the transistor, so that the capacitance voltage is limited. The capacitance is discharged upon a second edge, after which the cycle is repeated. The output signal of the pulse shaper is a signal which varies with the current through the capacitance.
摘要翻译： 具有按顺序排列的输入部分，调频输入信号所在的FM解调器的接收机以及FM解调器包括脉冲整形器和低通滤波器的LF部分，脉冲整形器 包括至少负载和电容的串联布置，晶体管的基极 - 发射极结被布置在电容之间，并且还包括用于对电容进行充电和放电的开关装置。 脉冲整形器产生低噪声脉冲，因为电容的充电在输入信号的边沿开始。 电容电压由单个晶体管测量，并且当晶体管导通时，电容的充电电流经由晶体管转移，使得电容电压受到限制。 电容在第二边缘放电，之后重复该周期。 脉冲整形器的输出信号是随通过电容的电流而变化的信号。
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公开(公告)号：US5430414A
公开(公告)日：1995-07-04
申请号：US34931
申请日：1993-03-19
IPC分类号： H03B5/12 , H03K3/0231 , H03K3/282 , H03K4/50
CPC分类号： H03K3/2821 , H03K3/0231
摘要： An electric circuit including a local oscillator circuit and which is adapted to prevent voltage transients. The oscillator circuit comprises two voltage sources which are alternately connected to respective electrodes of a capacitor. The capacitor electrodes are also connected, via respective load circuits, to a common reference node of the voltage sources. Thus, the respective voltage sources alternately generate mutually opposed currents in the capacitor, which currents charge and discharge the capacitor 20 to threshold levels, after which a switching control circuit interchanges the coupling of the voltage sources. In order to prevent a transient in the voltage level at the first capacitor electrode upon switching, a voltage control circuit provides a voltage difference between the voltages supplied by the voltage sources, which voltage difference corresponds to the charge voltage built up across the capacitor.
摘要翻译： 一种包括本地振荡器电路并且适于防止电压瞬变的电路。 振荡器电路包括交替地连接到电容器的各个电极的两个电压源。 电容器电极也经由相应的负载电路连接到电压源的公共参考节点。 因此，各个电压源在电容器中交替地产生相互相反的电流，电流将电容器20充电和放电至阈值电平，之后开关控制电路交换电压源的耦合。 为了防止在切换时在第一电容器电极处的电压电平的瞬态，电压控制电路提供由电压源提供的电压之间的电压差，该电压差对应于在电容器两端积聚的充电电压。
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公开(公告)号：US5408196A
公开(公告)日：1995-04-18
申请号：US213775
申请日：1994-03-16
IPC分类号： H03J3/00 , H03D3/24 , H03J1/00 , H03J5/00 , H04N5/50 , H03D3/00 , H03L1/00 , H03L7/00 , H03L7/20
CPC分类号： H03D3/241 , H03J1/005 , H03J2200/28
摘要： A signal receiving device is kept tuned by a tuning signal, which supplied to a tuning input of a tunable circuit in the signal receiving device. The tuning signal is supplied from a memory. The signal receiving device has an operating state and a calibrating state. The calibrating state serves to determine the tuning signal and to store it in the memory. In the calibrating state, a broadband signal source supplies a broadband signal to a band-pass filter. The band-pass filter is tuned to and passes a reference signal to the tunable circuit which provides the signal receiving device with selectivity in the operating state. The response of the tunable circuit to the reference signal is monitored and a tuning signal is selected for which it is measured that the tunable circuit is tuned to the reference signal which is passed by the band-pass filter.
摘要翻译： 信号接收装置通过调谐信号保持调谐，该调谐信号提供给信号接收装置中的可调谐电路的调谐输入。 调谐信号由存储器提供。 信号接收装置具有操作状态和校正状态。 校准状态用于确定调谐信号并将其存储在存储器中。 在校准状态下，宽带信号源向带通滤波器提供宽带信号。 带通滤波器被调谐到参考信号并将其传给可调谐电路，该可调谐电路在操作状态下提供信号接收装置的选择性。 监测可调电路对参考信号的响应，并且选择调谐信号，调谐信号被调谐到调谐电路被带通滤波器通过的参考信号。
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