公开(公告)号：US08331890B2

公开(公告)日：2012-12-11

申请号：US12372403

申请日：2009-02-17

申请人： Hsiang-Hui Chang ,  Chieh Hung Chen

发明人： Hsiang-Hui Chang ,  Chieh Hung Chen

IPC分类号： H04B1/16

CPC分类号： H03F3/217

摘要： 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.

摘要翻译： 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。

公开(公告)号：US08045717B2

公开(公告)日：2011-10-25

申请号：US11403775

申请日：2006-04-13

申请人： Chieh Hung Chen ,  Hsiang-Hui Chang ,  Chih-Chien Huang

发明人： Chieh Hung Chen ,  Hsiang-Hui Chang ,  Chih-Chien Huang

IPC分类号： H04H20/47

CPC分类号： H04H40/54

摘要： A stereo decoder and a method therefor are provided. The stereo decoder receives a MPX signal from an FM demodulator, and comprises a first auto-calibration circuit, a band-pass filter, a second auto-calibration circuit, a slicer and a PLL circuit. The first auto-calibration circuit generates a first control signal. The band-pass filter generates the pilot signal by filtering the MPX signal with a center frequency set by the first control signal. The second auto-calibration circuit generates a second control signal. The slicer converts the pilot signal into a square wave signal. The PLL circuit comprises a voltage controlled oscillator for generating an oscillation frequency in response to the second control signal. The PLL circuit receives the square wave signal to generate the reference signal around the predetermined frequency in response to the oscillation frequency.

摘要翻译： 提供了一种立体声解码器及其方法。 立体声解码器从FM解调器接收MPX信号，并且包括第一自动校准电路，带通滤波器，第二自动校准电路，限幅器和PLL电路。 第一自动校准电路产生第一控制信号。 带通滤波器通过以由第一控制信号设置的中心频率对MPX信号进行滤波来生成导频信号。 第二自动校准电路产生第二控制信号。 切片器将导频信号转换成方波信号。 PLL电路包括用于响应于第二控制信号产生振荡频率的压控振荡器。 PLL电路接收方波信号，以响应于振荡频率产生围绕预定频率的参考信号。

公开(公告)号：US07822211B2

公开(公告)日：2010-10-26

申请号：US11456999

申请日：2006-07-12

申请人： Hsiang-Hui Chang ,  Chih-Chien Huang ,  Chieh Hung Chen

发明人： Hsiang-Hui Chang ,  Chih-Chien Huang ,  Chieh Hung Chen

IPC分类号： H04H20/48

CPC分类号： H04H40/63 ,  H04B1/1653

摘要： A stereo decoding system comprises an oscillator, a bandpass filter, a PLL unit and a stereo decoder. The oscillator generates a first signal with a center frequency. The bandpass filter receives a stereo multiplexed signal and the first signal to filter out a pilot signal. The PLL unit receives the pilot signal to generate a PLL output signal. The stereo decoder receives the stereo multiplexed signal and the PLL output signal to separate a left channel signal and a right channel signal from the stereo multiplexed signal.

摘要翻译： 立体声解码系统包括振荡器，带通滤波器，PLL单元和立体声解码器。 振荡器产生具有中心频率的第一信号。 带通滤波器接收立体声多路复用信号和第一信号以滤除导频信号。 PLL单元接收导频信号以产生PLL输出信号。 立体声解码器接收立体声多路复用信号和PLL输出信号，以分离来自立体声多路复用信号的左声道信号和右声道信号。

公开(公告)号：US07697908B2

公开(公告)日：2010-04-13

申请号：US11403740

申请日：2006-04-13

申请人： Hsiang-Hui Chang ,  Chieh Hung Chen

发明人： Hsiang-Hui Chang ,  Chieh Hung Chen

IPC分类号： H04B1/16

CPC分类号： H03F3/217

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20080013743A1

公开(公告)日：2008-01-17

申请号：US11456999

申请日：2006-07-12

申请人： Hsiang-Hui Chang ,  Chih-Chien Huang ,  Chieh Hung Chen

发明人： Hsiang-Hui Chang ,  Chih-Chien Huang ,  Chieh Hung Chen

IPC分类号： H04H5/00

CPC分类号： H04H40/63 ,  H04B1/1653

摘要： A stereo decoding system comprises an oscillator, a bandpass filter, a PLL unit and a stereo decoder. The oscillator generates a first signal with a center frequency. The bandpass filter receives a stereo multiplexed signal and the first signal to filter out a pilot signal. The PLL unit receives the pilot signal to generate a PLL output signal. The stereo decoder receives the stereo multiplexed signal and the PLL output signal to separate a left channel signal and a right channel signal from the stereo multiplexed signal.

摘要翻译： 立体声解码系统包括振荡器，带通滤波器，PLL单元和立体声解码器。 振荡器产生具有中心频率的第一信号。 带通滤波器接收立体声多路复用信号和第一信号以滤除导频信号。 PLL单元接收导频信号以产生PLL输出信号。 立体声解码器接收立体声多路复用信号和PLL输出信号，以分离来自立体声多路复用信号的左声道信号和右声道信号。

公开(公告)号：US08144878B2

公开(公告)日：2012-03-27

申请号：US11369067

申请日：2006-03-06

申请人： Chieh Hung Chen

发明人： Chieh Hung Chen

IPC分类号： H04H5/00

CPC分类号： H04H40/45

摘要： 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.

摘要翻译： 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。