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    • 1. 发明申请
    • Digital audio broadcast receiver
    • 数字音频广播接收机
    • US20080152049A1
    • 2008-06-26
    • US11953674
    • 2007-12-10
    • Harald SandnerAjaib Hussain
    • Harald SandnerAjaib Hussain
    • H04L27/06
    • H04L27/0014H04H40/18H04H2201/20
    • A digital audio broadcast (DAB) receiver (10) for receiving an RF signal comprises a low noise amplifier (16), an RF mixer (24) that generates an intermediate frequency signal, and a voltage controlled oscillator (23). The receiver includes a tracking filter (18) downstream of the low noise amplifier (16) and upstream of the RF mixer (24), wherein the tracking filter is tuned to track a selected channel frequency out of the received RF signal. In a described embodiment, the tracking filter includes a bandpass filter (20) and a notch filter (22). A center frequency of the bandpass filter is tuned to track the selected channel frequency; and an attenuation notch of the notch filter is tuned to track a frequency which is separated from the selected channel frequency by a fixed frequency; the attenuation notch of the notch filter is tuned together with the center frequency of the bandpass filter, and the center frequencies of the notch filter and the bandpass filter are separated by a fixed frequency. The tracking filter is tuned by a digital word developed by a digital signal processor responsive to the intermediate frequency signal.
    • 用于接收RF信号的数字音频广播(DAB)接收机(10)包括低噪声放大器(16),产生中频信号的RF混频器(24)和压控振荡器(23)。 接收器包括在低噪声放大器(16)下游和RF混频器(24)的上游的跟踪滤波器(18),其中跟踪滤波器被调谐以跟踪所接收的RF信号中所选择的信道频率。 在所描述的实施例中,跟踪滤波器包括带通滤波器(20)和陷波滤波器(22)。 调整带通滤波器的中心频率以跟踪所选择的信道频率; 并且陷波滤波器的衰减陷波被调谐以跟踪与所选频道频率分离固定频率的频率; 陷波滤波器的衰减陷波与带通滤波器的中心频率一起调谐,陷波滤波器和带通滤波器的中心频率以固定频率分开。 跟踪滤波器由响应于中频信号的数字信号处理器开发的数字字来调谐。
    • 2. 发明授权
    • Heterodyne receiver
    • 外差接收机
    • US07962112B2
    • 2011-06-14
    • US11954136
    • 2007-12-11
    • Harald SandnerAjaib Hussain
    • Harald SandnerAjaib Hussain
    • H04B1/06H04K3/00
    • H03G3/3078H03G3/3068
    • A heterodyne receiver comprising a gain controllable RF mixer (14) which has a first input connected to a first local oscillator (16) and a second input connected to an RF input. The receiver comprises a peak detector (38) which detects a peak value of an input signal at the second input of the HF mixer and generates a digital control signal if it is determined that the peak value of the input signal is above a predetermined level. A digital automatic gain control circuit (34) decreases upon reception of the digital control signal the gain of the RF mixer.
    • 一种外差接收器,包括增益可控RF混频器(14),其具有连接到第一本地振荡器(16)的第一输入端和连接到RF输入端的第二输入端。 接收机包括峰值检测器(38),其在HF混频器的第二输入端检测输入信号的峰值,并且如果确定输入信号的峰值高于预定电平则产生数字控制信号。 数字自动增益控制电路(34)在接收到数字控制信号时降低RF混频器的增益。
    • 3. 发明申请
    • HETERODYNE RECEIVER
    • 异位接收器
    • US20080153445A1
    • 2008-06-26
    • US11954136
    • 2007-12-11
    • Harald SandnerAjaib Hussain
    • Harald SandnerAjaib Hussain
    • H04B1/06
    • H03G3/3078H03G3/3068
    • A heterodyne receiver comprising a gain controllable RF mixer (14) which has a first input connected to a first local oscillator (16) and a second input connected to an RF input. The receiver comprises a peak detector (38) which detects a peak value of an input signal at the second input of the HF mixer and generates a digital control signal if it is determined that the peak value of the input signal is above a predetermined level. A digital automatic gain control circuit (34) decreases upon reception of the digital control signal the gain of the RF mixer.
    • 一种外差接收器,包括增益可控RF混频器(14),其具有连接到第一本地振荡器(16)的第一输入端和连接到RF输入端的第二输入端。 接收机包括峰值检测器(38),其在HF混频器的第二输入端检测输入信号的峰值,并且如果确定输入信号的峰值高于预定电平则产生数字控制信号。 数字自动增益控制电路(34)在接收到数字控制信号时降低RF混频器的增益。
    • 10. 发明申请
    • Highspeed serial transmission system and a method for reducing jitter in data transfer on such a system
    • 高速串行传输系统和减少这种系统上的数据传输抖动的方法
    • US20070063880A1
    • 2007-03-22
    • US11384600
    • 2006-03-20
    • Joerg GollerHarald Sandner
    • Joerg GollerHarald Sandner
    • H03M9/00
    • H03K5/1565H04L1/205H04L7/0025H04L25/03343
    • In a high-speed serial transmission system (10) comprising a transmitter (12), a transmission line (14) and a receiver (16), the transmitter (12) includes a bit-stream generator (18) for generating a predetermined pseudo random bit sequence (PRBS), and a controllable phase distortion circuit (20) having an input (24) connected to the bit-stream generator (18) and a signal output (26) connected to the transmission line (14). The receiver (16) includes a sampling circuit (30) with a signal input (36) connected to the transmission line (14), a sampling clock input (38) and a data output (40), a clock recovery circuit (32) with a phase-locked loop circuit (42) and a controllable phase interpolator (44) that has signal inputs (45) connected to signal outputs of the phase-locked loop circuit (42) and an output (48) connected to the sampling clock input (38) of the sampling circuit (30), and a bit-stream verification circuit (32) with an input (50) connected to the data output (40) of the sampling circuit (30) and an output (52) that controls the controllable phase interpolator. An output (54) of the bit-stream verification circuit (34) controls the controllable phase distortion circuit (20) in the transmitter (12) in response to a bit error rate (BER) detected in the bit-stream received form the data output (40) of the sampling circuit (30) by comparison with the predetermined pseudo random bit sequence (PRBS).
    • 在包括发射机(12),传输线(14)和接收机(16)的高速串行传输系统(10)中,发射器(12)包括位流发生器(18),用于产生预定的伪 随机比特序列(PRBS)和具有连接到比特流发生器(18)的输入(24)和连接到传输线(14)的信号输出(26)的可控相位失真电路(20)。 接收器(16)包括具有连接到传输线(14)的信号输入(36),采样时钟输入(38)和数据输出(40),时钟恢复电路(32)的采样电路(30) 具有锁相环电路(42)和可控相位内插器(44),其具有连接到锁相环电路(42)的信号输出的信号输入(45)和连接到采样时钟的输出(48) 采样电路(30)的输入(38)和连接到采样电路(30)的数据输出(40)的输入(50)的位流验证电路(32)和输出(52), 控制可控相位内插器。 比特流验证电路(34)的输出(54)响应于从数据接收的比特流中检测到的比特误码率(BER)来控制发射机(12)中的可控相位失真电路(20) 通过与预定伪随机比特序列(PRBS)进行比较,采样电路(30)的输出(40)。