Abstract:
Apparatus and methods for performing automatic gain control in a radar system (20). One embodiment of the system includes an attenuator that controls gain of signals received from a radar receiver (24). A digital signal processor (44) determines coarse gain correction based on digitized noise data for a plurality of channels, dstemimes fine gain correction based on the residual error after the coarse gain, and determines frequency vs. gain curve correction based on the digitized noise data for a plurality of channels and a mathematical model of frequency gain across a noise spectrum for the radar system. The result of the processor is a gain control signal that is sent to the attenuator to perform hardware gain control and a channel specific scale factor for software gain control. In one embodiment, the processor generates the gain contra signal during an inactive scan mode of the radar system.
Abstract:
A first low-noise amplifier is connected to a first receiving processing unit through a first cable and a bypass circuit is provided in parallel to the first low-noise amplifier so as to bypass the first low-noise amplifier. In the case that the intensity of broadcasting signal is more than a predetermined value, when the C/N is more than a first predetermined value and less than a second predetermined value higher than the first predetermined value, the broadcasting signal is transmitted to the first cable through the first low-noise amplifier, and when the C/N is less than the first predetermined value or more than the second predetermined value, the broadcasting signal is not input to the first low-noise amplifier but transmitted to the first cable through the bypass circuit.
Abstract:
A receiver for processing a signal comprises a first amplifier circuit and a second amplifier circuit. The first amplifier circuit is operated in association with a first gain profile. The second amplifier circuit is operated in association with a second gain profile. The receiver further comprises a gain control circuit that determines a quality indicator associated with a modulated signal. The gain control circuit adjusts the first gain profile and the second gain profile based at least in part upon the determined quality indicator.
Abstract:
A receiver for processing a signal comprises a first amplifier circuit and a second amplifier circuit. The first amplifier circuit is operated in association with a first gain profile. The second amplifier circuit is operated in association with a second gain profile. The receiver further comprises a gain control circuit that determines a quality indicator associated with a modulated signal. The gain control circuit adjusts the first gain profile and the second gain profile based at least in part upon the determined quality indicator.
Abstract:
본 발명은 수신강도와 복조시의 C/N과의 2개의 조건을 고려하여 왜곡 저감, 수신감도 향상 및 전력의 절약을 도모하는 것이다. 이를 위하여 본 발명에서는 제 1 저잡음 증폭기(22)와 제 1 수신 처리부(27)를 제 1 케이블(26)로 접속하고, 제 1 저잡음 증폭기(22)에는 이것을 우회하기 위한 바이패스회로(23)를 병설하여, 지상 디지털 방송 신호의 강도가 소정값(E) 이상의 경우로서, C/N이 제 1 소정값(C1) 이상이고 또한 제 1 소정값(C1)보다도 높은 제 2 소정값(C2) 이하일 때에는, 지상파 디지털 방송 신호를 제 1 저잡음 증폭기(22)를 거쳐 제 1 케이블(26)에 송출하고, C/N이 제 1 소정값(C1) 이하 또는 제 2 소정값(C2) 이상일 때에는 지상 디지털 방송 신호를 제 1 저잡음 증폭기(22)에 입력하지 않고 바이패스회로(23)를 거쳐 제 1 케이블(26)에 송출하였다.
Abstract:
An on-vehicle receiving device for promoting distortion reduction, improvement of receive sensitivity, and power-saving effect is provided to increase the receive sensitivity if a C/N(Carrier to Noise) ratio is between the first and second predetermined values, and to prevent deterioration of the C/N ratio if the ratio is less than the first predetermined value as reducing power consumption, then to decrease power consumption as maintaining a large C/N ratio even when the ratio is more than the second predetermined value. The first LNA(Low Noise Amplifier)(22) and the first receiving processor(27) are connected by the first cable(26). A bypass circuit(23) for detouring the first LNA(22) is installed in the first LNA(22), so that intensity of a terrestrial digital broadcasting signal is more than a predetermined value. When a C/N ratio is more than the first predetermined value and less than the second predetermined value higher than the first predetermined value, the terrestrial digital broadcasting signal is delivered to the first cable(26) via the first LNA(22). If the C/N ratio is less than the first predetermined value or more than the second predetermined value, the terrestrial digital broadcasting signal is delivered to the first cable(26) via the bypass circuit(23) without being inputted to the first LNA(22).
Abstract in simplified Chinese:一种处理信号用之接收器包含第一放大器电路和第二放大器电路。该第一放大器电路系结合第一增益侧绘一起操作。该第二放大器电路系结合第二增益侧绘一起操作。该接收器进一步包含可测定与经调制的信号相关联的品质指针的增益控制电路。该增益控制电路至少部分基于该所测定的品质指针来调整该第一增益侧绘和该第二增益侧绘。
Abstract in simplified Chinese:一种处理信号用之接收器包含第一放大器电路和第二放大器电路。该第一放大器电路系结合第一增益侧绘一起操作。该第二放大器电路系结合第二增益侧绘一起操作。该接收器进一步包含可测定与经调制的信号相关联的品质指针的增益控制电路。该增益控制电路至少部分基于该所测定的品质指针来调整该第一增益侧绘和该第二增益侧绘。