公开(公告)号：US06771781B2

公开(公告)日：2004-08-03

申请号：US09851023

申请日：2001-05-08

申请人： Daniel A. Chattin

发明人： Daniel A. Chattin

IPC分类号： H04B300

CPC分类号： H04R3/002

摘要： The invention is a variable damping circuit for a loudspeaker that provides for frequency dependent control of a loudspeaker by an amplifier. The variable damping circuit includes an amplifier, at least one loudspeaker, a pair of connectors between the amplifier and the loudspeaker, and a reactive component wired in parallel with a resistor connected to one of the pair of connectors between the amplifier and loudspeaker, wherein the resistance value of the reactive component and resistor does not exceed fifty percent of a resistance value of the loudspeaker. The reactive component may be a coil, a capacitor, or both a coil and a capacitor both of which are connected in parallel with the resistor.

摘要翻译： 本发明是用于扬声器的可变阻尼电路，其通过放大器提供扬声器的频率相关控制。 可变阻尼电路包括放大器，至少一个扬声器，放大器和扬声器之间的一对连接器，以及与连接到放大器和扬声器之间的一对连接器之一的电阻器并联布线的无功元件，其中， 无功分量和电阻的电阻值不超过扬声器电阻值的百分之五十。 电抗分量可以是线圈，电容器，或两者都与电阻器并联连接的线圈和电容器。

公开(公告)号：US06744820B1

公开(公告)日：2004-06-01

申请号：US09528974

申请日：2000-03-21

申请人： Farid Khairallah ,  Russell J. Lynch ,  Roger A. McCurdy ,  Keith R. Miciuda ,  Jon K. Wallace ,  Scott E. Kolassa

发明人： Farid Khairallah ,  Russell J. Lynch ,  Roger A. McCurdy ,  Keith R. Miciuda ,  Jon K. Wallace ,  Scott E. Kolassa

IPC分类号： H04B300

CPC分类号： H04B3/548 ,  B60R21/01 ,  B60R2021/01068 ,  B60R2021/01115 ,  H04B2203/5416 ,  H04B2203/5425 ,  H04B2203/5458 ,  H04B2203/547

摘要： A communication system (10) includes a communication bus (16) through which a power/voltage transmitter (44) conveys electrical energy and messages to a plurality of units (18, 20). The power/voltage transmitter (44) includes components for adjusting voltage of the electrical energy past a first predetermined threshold to provide a first type message frame and modulating the voltage of the electrical energy during the first type message frame to convey a first type message. The power/voltage transmitter (44) also includes components for adjusting the voltage past a second predetermined threshold to provide a second type message frame and modulating the voltage of the electrical energy during the second type message frame to convey a second type message.

摘要翻译： 通信系统（10）包括通信总线（16），电力/电压发射器（44）通过该通信总线向多个单元（18,20）传送电能和消息。 电源/电压发射器（44）包括用于调整电能的电压超过第一预定阈值以提供第一类型消息帧并在第一类型消息帧期间调制电能的电压以传送第一类型消息的组件。 电源/电压发射器（44）还包括用于调整电压超过第二预定阈值以提供第二类型消息帧并且在第二类型消息帧期间调制电能的电压以传送第二类型消息的组件。

公开(公告)号：US06678381B1

公开(公告)日：2004-01-13

申请号：US09197675

申请日：1998-11-23

申请人： Koji Manabe

发明人： Koji Manabe

IPC分类号： H04B300

CPC分类号： H04R3/12 ,  H04R2217/03

摘要： The ultra-directional speaker of the present invention comprises: an audio generator for generating an audio signal; an ultrasonic generator for generating an ultrasonic signal; a frequency modulator for frequency modulating the ultrasonic signal with the audio signal to produce a frequency modulated ultrasonic signal; and an electro-acoustic transducer for transducing the frequency modulated ultrasonic signal into acoustic waves.

摘要翻译： 本发明的超方向扬声器包括：用于产生音频信号的音频发生器; 用于产生超声波信号的超声波发生器; 频率调制器，用于利用音频信号对超声信号进行频率调制，以产生调频超声信号; 以及用于将调频超声波信号转换成声波的电声换能器。

公开(公告)号：US06614848B2

公开(公告)日：2003-09-02

申请号：US09068884

申请日：1998-11-09

申请人： Georg Lohr

发明人： Georg Lohr

IPC分类号： H04B300

CPC分类号： H01P1/062 ,  H01F2038/146 ,  H01P1/061 ,  H03K5/125 ,  H04L25/0266 ,  H04L25/03834

摘要： Devices consisting of a signal source and a signal sink connected by a transmission channel for transmitting high-frequency signals, as well as digital signals between moving parts. By eliminating wave reflections, the signals are transmitted such that reliable wide-band transmissions are ensured.

摘要翻译： 由信号源和由传输通道连接的用于传输高频信号的信号宿组成的设备，以及运动部件之间的数字信号。 通过消除波反射，信号被传输，从而确保可靠的宽带传输。

公开(公告)号：US06570928B1

公开(公告)日：2003-05-27

申请号：US09473609

申请日：1999-12-29

申请人： Eiji Shibata

发明人： Eiji Shibata

IPC分类号： H04B300

CPC分类号： H04N7/10 ,  H04H20/12 ,  H04H20/28 ,  H04H20/76 ,  H04H60/13 ,  H04H60/37 ,  H04L1/08

摘要： In a proposed cable broadcasting system in which a command signal transmitted from a center equipment to a transmission line for setting an operation mode of a tap device on the transmission line, the command signal can be transmitted without fail even when an instantaneous power failure occurs because of thunderbolt and the like. The center equipment transmits a command signal with a retransmission number indicating the number of transmission plural times at intervals of a time longer than the duration time of the instantaneous power failure. The tap device determines whether the new received data of the command signal is a command to the tap device itself by using the address of the received data. When the command is for itself, it is determined whether the command (received command) coincides with the command previously used for setting the operation mode. When they do not coincide with each other, the operation mode is set in response to the received command. To the contrary, when they coincide with each other, the retransmission number given to each command is compared. When the retransmission number of the received command is equal to or smaller than the previous number, the operation mode is set in response to the received command.

摘要翻译： 在从中心设备发送到用于设置传输线上的抽头设备的操作模式的传输线的命令信号的建议的有线电视广播系统中，即使发生瞬时电源故障，也能够无故障地发送命令信号，因为 雷电等。 中心设备以比瞬时停电持续时间更长的时间间隔发送具有指示多次发送次数的重传号的命令信号。 抽头设备通过使用接收到的数据的地址来确定命令信号的新接收数据是否是对抽头设备本身的命令。 当命令本身时，确定命令（接收命令）是否与先前用于设置操作模式的命令一致。 当它们不一致时，响应于所接收的命令来设置操作模式。 相反，当它们彼此一致时，比较给予每个命令的重传号。 当接收到的命令的重发次数等于或小于先前的号码时，响应于所接收的命令来设置操作模式。

公开(公告)号：US06493393B1

公开(公告)日：2002-12-10

申请号：US09044926

申请日：1998-03-20

申请人： Bernard Pignault

发明人： Bernard Pignault

IPC分类号： H04B300

CPC分类号： G06F13/4077

摘要： This invention relates to a digital communication bus between electronic modules (S1, Sn), composed of at least one pair of data transmission lines (2A, 2B) and terminating by line terminators (TA, TB), and characterized by the fact that it comprises, for example in the two line terminators (TA, TB), components (R6, R7, R3, R4) imposing transmission with polarization and inverting the polarization whenever one or both line terminators are missing, or are not connected to the bus, or the bus is open.

摘要翻译： 本发明涉及电子模块（S1，Sn）之间的数字通信总线，其由至少一对数据传输线（2A，2B）组成，并由线路终端器（TA，TB）终止，其特征在于： 包括例如在两个线路终端器（TA，TB）中，当一个或两个线路终端器丢失或者不连接到总线时，施加具有极化的传输和反转极化的组件（R6，R7，R3，R4） 或公共汽车是开放的。

公开(公告)号：US06442208B1

公开(公告)日：2002-08-27

申请号：US08909391

申请日：1997-08-11

申请人： Mari Horiguchi ,  Naofumi Yanagihara

发明人： Mari Horiguchi ,  Naofumi Yanagihara

IPC分类号： H04B300

CPC分类号： H04N21/43632 ,  G11B20/10 ,  H04N5/765 ,  H04N5/775 ,  H04N5/85 ,  H04N9/8042 ,  H04N9/8063 ,  H04N21/4325 ,  H04N21/4341 ,  H04N21/44227

摘要： DVD reproducing apparatus which transmits variable-bit rate data on a digital serial bus having a predetermined transmission rate. The DVD reproducing apparatus reproduces data from a record medium in accordance with a control signal to produce variable rate data. The data rate of the variable rate data is detected at predetermined intervals of time, a rate of transmission of the variable rate data is established in accordance with the detected data rate, and the variable rate data is transmitted in accordance with the established transmission rate. The DVD reproducing apparatus includes an MPEG decoder which MPEG decodes the reproduced data and which generates the control signal in accordance with amounts of data stored within various buffers, such control signal being utilized to control the reproduction of the data from the record medium. A receiver, e.g., a digital television, having an MPEG decoder therein receives the transmitted data and MPEG decodes the data, but such MPEG decoder does not generate a control signal similar to the previously generated control signal in order to prevent underflow/overflow of the memories therein. In another embodiment, the DVD reproducing apparatus does not include therein an MPEG decoder, but the receiving device's MPEG decoder, unlike the first mentioned embodiment, generates a control signal that is transmitted back to the DVD reproducing apparatus in order to prevent underflow/overflow of the memories within the receiving device's MPEG decoder.

摘要翻译： DVD再现装置，其在具有预定传输速率的数字串行总线上传送可变比特率数据。 DVD再现装置根据控制信号从记录介质再现数据，以产生可变速率数据。 以预定的时间间隔检测可变速率数据的数据速率，根据检测到的数据速率建立可变速率数据的传输速率，并且根据建立的传输速率发送可变速率数据。 DVD再现装置包括MPEG解码器，MPEG解码再现数据，并且根据存储在各种缓冲器内的数据量生成控制信号，该控制信号用于控制从记录介质再现数据。 具有MPEG解码器的接收机，例如数字电视接收所发送的数据，并对数据进行MPEG解码，但是这样的MPEG解码器不产生类似于先前产生的控制信号的控制信号，以便防止下溢/溢出 其中的记忆 在另一个实施例中，DVD再现设备在其中不包括MPEG解码器，但是与第一个提到的实施例不同，接收设备的MPEG解码器生成被发送回DVD再现设备的控制信号，以防止下溢/溢出 在接收设备的MPEG解码器内的存储器。

公开(公告)号：US06389077B1

公开(公告)日：2002-05-14

申请号：US09568520

申请日：2000-05-09

申请人： Kevin T. Chan

发明人： Kevin T. Chan

IPC分类号： H04B300

CPC分类号： H04L25/08 ,  H04B3/23 ,  H04B3/32 ,  H04L12/10 ,  H04L25/0276 ,  H04L25/0282 ,  H04L25/0286 ,  H04L25/03834 ,  H04L25/14

摘要： A power efficient and reduced electromagnetic interference (EMI) emissions transmitter for unshielded twisted pair (UTP) data communication applications. Transmit data is processed by a digital filter. The digital filter output data is converted to a current-mode analog waveform by a digital-to-analog converter (DAC). The digital filter is integrated with the DAC binary decoder in a memory device such as a ROM with time multiplexed output. DAC line driver cells are adaptively configurable to operate in either a class-A or a class-B mode depending on the desired operational modality. A discrete-time analog filter is integrated with the DAC line driver to provide additional EMI emissions suppression. An adaptive electronic transmission signal cancellation circuit separates transmit data from receive data in a bidirectional communication system operating in full duplex mode. For a multi-transmitter system, timing circuitry staggers the time base of each transmitter to reduce the aggregate EMI emissions of the multi-transmitter system.

公开(公告)号：US06359990B1

公开(公告)日：2002-03-19

申请号：US09135732

申请日：1998-08-18

申请人： Elwood G. Norris

发明人： Elwood G. Norris

IPC分类号： H04B300

CPC分类号： H04R27/00 ,  F41H13/0081 ,  G10K15/02 ,  H04R27/04 ,  H04R2217/03

摘要： A sound emiting device for providing at least one new sonic or subsonic frequency as a by-product of emitting a waveform of at least two ultrasonic frequencies whose difference in value corresponds to the desired new sonic or subsonic frequency. The device includes a parametric emitting perimeter positioned around a central open section. This open section is structured with a diagonal width greater than a cross-sectional diagonal of the parametric emitting perimeter. An ultrasonic frequency signal source and sonic/subsonic frequency generator are coupled together to a modulating circuit for mixing an ultrasonic frequency signal with an electrical signal corresponding to the at least one new sonic or subsonic frequency. The modulator output is coupled to the emitting perimeter which comprises ultrasonic frequency emitting material for propagating the mixed waveform into air for demodulating the waveform to generate the at least one new sonic or subsonic frequency.

摘要翻译： 一种用于提供至少一种新的声音或亚音速频率作为发射至少两个超声波频率的波形的副产物的声音发射装置，其差值对应于期望的新的声音或亚音速频率。 该装置包括围绕中心开口部分定位的参数发射周界。 该开放部分被构造成具有大于参数发射边界的横截面对角线的对角线宽度。 超声波频率信号源和声音/亚音速频率发生器耦合到调制电路，用于将超声波频率信号与对应于至少一个新的声音或亚音速频率的电信号混合。 调制器输出耦合到发射周边，其包括用于将混合波形传播到空气中的超声波发射材料，用于解调波形以产生至少一个新的声音或亚音速频率。

公开(公告)号：US06351496B1

公开(公告)日：2002-02-26

申请号：US09143417

申请日：1998-08-28

申请人： Ahmed A. Tarraf

发明人： Ahmed A. Tarraf

IPC分类号： H04B300

摘要： A method for conveying information-carrying teletype signals over a wireless telecommunication system by encoding the information into a repetitive signal. Teletype information is derived from part of a received signal encoded as a repetitive signal which part has been determined not to have been adversely affected by the wireless telecommunication system.