公开(公告)号：US5625350A

公开(公告)日：1997-04-29

申请号：US364861

申请日：1994-12-27

申请人： Hitoshi Fukatsu ,  Takashi Miyake ,  Tadashi Tanihira ,  Kouichi Sato ,  Tadashi Sano

发明人： Hitoshi Fukatsu ,  Takashi Miyake ,  Tadashi Tanihira ,  Kouichi Sato ,  Tadashi Sano

IPC分类号： B60R16/02 ,  B60R16/03 ,  H04B1/20 ,  H04N5/44 ,  H04N5/765 ,  H04Q9/00

CPC分类号： H04B1/207 ,  H04N5/765 ,  B60R16/0315 ,  H04B1/205 ,  H04N5/44

摘要： A communication system for e.g. an automobile including a system control unit for activating a selected audio/video device (such as an AM/FM tuner or a navigation system) in response to a request signal transmitted on a bus from a command input terminal. The system control unit generates command signals necessary to activate the selected audio/video device in response to the request signal, including command signals to de-activate any currently-operating devices. Conversely, adjustment commands (such as volume change or channel change commands) are transmitted directly (that is, unchanged by the system control unit) from the command input terminal to the selected audio/video device on the first bus line. In addition, the audio/video devices transmit reset signals whenever power is shut-off and then restored. Each reset signal includes a transmission source address corresponding to the audio/video device which transmitted the signal. The system control unit compares these transmission source addresses with a stored address corresponding to the selected audio/video device, and transmits a command signal to restart the selected audio/video device. Further, when the system control unit is turned off and then restored, the system control unit transmits a reset command to all of the audio/video devices connected to the bus.

摘要翻译： 一种通信系统。 包括用于响应于在总线上从命令输入端子发送的请求信号来激活所选择的音频/视频设备（诸如AM / FM调谐器或导航系统）的系统控制单元的汽车。 系统控制单元响应于请求信号产生激活所选择的音频/视频设备所需的命令信号，包括命令信号以禁用任何当前操作的设备。 相反，调节命令（例如音量变化或频道改变命令）从命令输入终端直接发送到系统控制单元（即，系统控制单元未被更改）到第一总线上的所选音频/视频设备。 此外，每当关闭电源然后恢复时，音频/视频设备都会传输复位信号。 每个复位信号包括对应于发送信号的音频/视频设备的发送源地址。 系统控制单元将这些发送源地址与对应于所选择的音频/视频设备的存储地址进行比较，并发送命令信号以重新启动所选择的音频/视频设备。 此外，当系统控制单元关闭然后恢复时，系统控制单元向连接到总线的所有音频/视频设备发送复位命令。

公开(公告)号：US4654884A

公开(公告)日：1987-03-31

申请号：US733593

申请日：1985-05-10

申请人： Tsuneo Sakai ,  Tadashi Tanihira ,  Yoshio Ito

发明人： Tsuneo Sakai ,  Tadashi Tanihira ,  Yoshio Ito

IPC分类号： H03G3/20 ,  H03J1/00 ,  H03J5/02 ,  H04B1/10 ,  H04B1/16

CPC分类号： H03G3/3052 ,  H03J1/0083 ,  H03J5/0272 ,  H04B1/109

摘要： A radio receiver includes a first tuner, a first intermediate-frequency amplifier, at least two intermediate-frequency filters connected between the first tuner and the first intermediate-frequency amplifier and having difference frequency bands, a switching circuit for applying an output signal from the first tuner through a selected one of the intermediate-frequency filters to the first intermediate-frequency amplifier, an automatic gain control circuit for controlling the gain of the first tuner, a first phase-locked loop for enabling a local oscillator in the first tuner to oscillate at a frequency dependent on the frequency of a desired channel, a second tuner, a level detector circuit for detecting the level of an output signal from the second tuner, a second phase-locked loop for enabling a local oscillator in the second tuner to oscillate at a prescribed frequency, and a controller for controlling the first phase-locked loop to enable the first tuner to receive and issue a desired signal from a desired channel, for controlling the second phase-locked loop to enable the second tuner to receive and issue signals from the desired channel and other channels, for enabling the level detector circuit to detect the levels of the received signals of the channels, for selecting the one of the intermediate-frequency filters based on the detected levels of received signals, and for controlling the automatic gain control circuit.

摘要翻译： 无线电接收机包括第一调谐器，第一中频放大器，连接在第一调谐器和第一中频放大器之间并具有不同频带的至少两个中频滤波器，用于施加来自 通过所选择的一个中频滤波器到第一中频放大器的第一调谐器，用于控制第一调谐器的增益的自动增益控制电路，用于使第一调谐器中的本地振荡器启用的第一锁相环 以取决于期望信道的频率的频率振荡，第二调谐器，用于检测来自第二调谐器的输出信号的电平的电平检测器电路，用于使第二调谐器中的本地振荡器使能的第二锁相环 以规定的频率振荡，以及控制器，用于控制第一锁相环，使得第一调谐器能够接收并发出设定 来自所需通道的红色信号，用于控制第二锁相环以使得第二调谐器能够从期望的通道和其他通道接收和发出信号，以使电平检测器电路能够检测通道的接收信号的电平 ，用于基于检测到的接收信号电平来选择一个中频滤波器，以及用于控制自动增益控制电路。