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1. 发明申请

US20080152049A1 Digital audio broadcast receiver 审中-公开
标题翻译：数字音频广播接收机
公开(公告)号：US20080152049A1
公开(公告)日：2008-06-26
申请号：US11953674
申请日：2007-12-10
申请人： Harald Sandner , Ajaib Hussain
发明人： Harald Sandner , Ajaib Hussain
IPC分类号： H04L27/06
CPC分类号： H04L27/0014 , H04H40/18 , H04H2201/20
摘要： 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.
摘要翻译：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

US07962112B2 Heterodyne receiver 有权
标题翻译：外差接收机
公开(公告)号：US07962112B2
公开(公告)日：2011-06-14
申请号：US11954136
申请日：2007-12-11
申请人： Harald Sandner , Ajaib Hussain
发明人： Harald Sandner , Ajaib Hussain
IPC分类号： H04B1/06 , H04K3/00
CPC分类号： H03G3/3078 , H03G3/3068
摘要： 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.
摘要翻译：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

US20080153445A1 HETERODYNE RECEIVER 有权
标题翻译：异位接收器
公开(公告)号：US20080153445A1
公开(公告)日：2008-06-26
申请号：US11954136
申请日：2007-12-11
申请人： Harald Sandner , Ajaib Hussain
发明人： Harald Sandner , Ajaib Hussain
IPC分类号： H04B1/06
CPC分类号： H03G3/3078 , H03G3/3068
摘要： 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.
摘要翻译：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。

4. 发明授权

US5006932A Apparatus for processing a video signal 失效
标题翻译：用于处理视频信号的装置
公开(公告)号：US5006932A
公开(公告)日：1991-04-09
申请号：US342255
申请日：1989-04-21
申请人： Michael J. Bergstrom , Ajaib Hussain
发明人： Michael J. Bergstrom , Ajaib Hussain
IPC分类号： H04N9/44 , H04N5/18 , H04N5/932 , H04N9/85 , H04N9/87
CPC分类号： H04N9/87 , H04N5/18 , H04N5/932
摘要： A composite video signal each line of which comprises a line synchronizing pulse, a front and a back porch and a vision portion, the synchronizing pulse of which may contain a burst of pulsed additional information is applied to an input terminal (1) which is connected to the input of a first signal path (T1, T2) whose output is connected to a current source (I1) and to an output terminal (8). A second signal path (T3, T4) has its input connected to a reference voltage input (5) and its output connected to the current source (I1) and the output terminal (8). A switching circuit (T5, T6) alternately enables the first and second signal paths (T1, T2; T3, T4) under the control of a switching signal at a connection (10) such that the output terminal (8) produces a composite video signal in which the synchronizing pulse at the input terminal is replaced by a pulse or level. The replacement does not contain the burst of pulsed additional information when present in the applied signal.

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