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    • 8. 发明申请
    • Duty-to-voltage amplifier, FM receiver and method for amplifying a peak of a multiplexed signal
    • 负载电压放大器,FM接收器和用于放大多路复用信号的峰值的方法
    • US20070243840A1
    • 2007-10-18
    • US11403740
    • 2006-04-13
    • Hsiang-Hui ChangChieh Chen
    • Hsiang-Hui ChangChieh Chen
    • H04B1/16
    • H03F3/217
    • A FM receiver comprises an IF filter, a demodulator and a decoder. The IF filter generates an RSSI and a FM modulated signal in response to a FM signal. The demodulator comprises a duty-to-voltage amplifier for amplifying a peak of a MPX signal. The duty-to-voltage amplifier comprises a current source, a switch and a current splitter. The current source generates a current. The switch controls a flow of the first current in response to a PWM signal. The current splitter splits the flow of the current into a sub-flow in response to the RSSI. The peak of the MPX signal is proportional to the sub-flow. The decoder receives the MPX signal to generate an audio signal to play sound.
    • FM接收机包括IF滤波器,解调器和解码器。 IF滤波器响应于FM信号产生RSSI和FM调制信号。 解调器包括用于放大MPX信号的峰值的占空比电压放大器。 负载电压放大器包括电流源,开关和电流分配器。 电流源产生电流。 开关控制响应于PWM信号的第一电流的流动。 当前的分流器响应于RSSI将电流的流分解成子流。 MPX信号的峰值与子流量成正比。 解码器接收MPX信号以产生音频信号以播放声音。
    • 9. 发明申请
    • FM receiver and pilot detector thereof, and method for determining a type of a processed signal
    • FM接收机及其导频检测器,以及用于确定处理信号的类型的方法
    • US20070223707A1
    • 2007-09-27
    • US11369067
    • 2006-03-06
    • Chieh Chen
    • Chieh Chen
    • H04H5/00
    • H04H40/45
    • An FM receiver and a pilot detector thereof, and a method for determining a type of a processed signal are provided. The FM receiver comprises a demodulator, a band pass filter (BPF), and a pilot detector. The demodulator generates a multiplexed (MPX) signal. The BPF filters the MPX signal to generate a pilot signal. The pilot detector comprises a signal addition device and a comparator. The signal addition device adds the processed signal for a period of time and to generate a result signal in response to the addition. The comparator compares the result signal with a reference to determine whether the type is stereo. The method comprises the steps of: adding the processed signal for a period of time; generating a result signal in response to the addition; and comparing the result signal with a reference to determine whether the type is stereo.
    • 提供FM接收机及其导频检测器,以及用于确定处理信号的类型的方法。 FM接收机包括解调器,带通滤波器(BPF)和导频检测器。 解调器产生复用(MPX)信号。 BPF对MPX信号进行滤波以产生导频信号。 导频检测器包括信号添加装置和比较器。 信号添加装置将经处理的信号添加一段时间,并且响应于添加而产生结果信号。 比较器将结果信号与参考值进行比较,以确定该类型是立体声。 该方法包括以下步骤:将经处理的信号添加一段时间; 响应于所述相加产生结果信号; 并将结果信号与参考进行比较,以确定该类型是立体声。