-
公开(公告)号：US4254387A
公开(公告)日：1981-03-03
申请号：US947141
申请日：1978-09-29
CPC分类号： H03H9/6436 , H03H9/02842 , H03H9/25
摘要： An acoustic wave resonator device comprises a substrate carrying a pair of spaced apart reflectors forming a resonant cavity that supports only three adjacent distinct resonant mode frequencies. An interdigital transducer is disposed on the substrate between the reflectors and includes an array of electrodes symmetrically arranged relative to a central point of the cavity to form a plurality of electrode pairs with the electrodes of each pair equally spaced on opposite sides of the central point. The central point of the cavity coincides with a node or an anti-node of the standing wave. If the two electrodes of each electrode pair are connected to the same terminal then the transducer has zero net coupling with one set of alternate modes of the cavity, whereas if said two electrodes are connected to opposite terminals then the transducer has zero net coupling with the other set of alternate modes.
摘要翻译： 声波谐振器装置包括承载一对间隔开的反射器的基板，其形成仅支撑三个相邻的不同谐振模式频率的谐振腔。 叉指换能器设置在反射器之间的基板上，并且包括相对于腔的中心点对称地布置的电极阵列，以形成多个电极对，每对的电极在中心点的相对侧上等间隔开。 腔的中心点与驻波的节点或反节点重合。 如果每个电极对的两个电极连接到相同的端子，则换能器与空腔的一组交替模式具有零网络耦合，而如果所述两个电极连接到相对的端子，则换能器具有零网络耦合 其他一组备用模式。
-
公开(公告)号：US4281301A
公开(公告)日：1981-07-28
申请号：US74694
申请日：1979-09-12
CPC分类号： H03H9/6473 , H03H9/02779 , H03H9/6436 , H03H9/6459 , H03H9/1455
摘要： In an acoustic wave device having a pair of spaced apart reflectors forming a resonant cavity, each reflector consists of an array of parallel reflective elements. At least one of the reflectors is weighted not by simple withdrawal of reflecting elements from a nominal uniform array but instead by substituting reflective elements of the uniform array with elements providing both net-zero reflection at required positions and also at least partial compensation for the velocity perturbation which would be produced by such simple withdrawal. Such weighting may be used to suppress the side lobes of the reflector response and hence improve the stopband performance of the acoustic wave device and, for example, a coupled resonator filter in which that device is incorporated.
摘要翻译： 在具有形成谐振腔的一对间隔开的反射器的声波装置中，每个反射器由平行的反射元件阵列组成。 反射器中的至少一个不是通过从标称均匀阵列简单地撤回反射元件来加权，而是通过用在所需位置提供净零反射的元件代替均匀阵列的反射元件，并且还对速度进行至少部分补偿 这种简单撤回将产生扰动。 可以使用这种加权来抑制反射器响应的旁瓣，并且因此改善声波装置和例如其中结合有该装置的耦合谐振滤波器的阻带性能。
-
公开(公告)号：US4630257A
公开(公告)日：1986-12-16
申请号：US678732
申请日：1984-12-06
申请人： Philip D. White
发明人： Philip D. White
CPC分类号： H04B1/56 , H04M1/72511
摘要： A duplex speech transmission method is disclosed wherein a limited bandwidth transmission channel is divided in a plurality of successive time slots, alternate time slots being available for each of two parties to call in Speech signals from either of the parties are divided into time segments with the time segments associated with one of said two parties being offset in time with the time segments associated with the other of said two parties. Segments of speech when present are digitised and stored in digital form. A higher rate of quantization is used when speech is present in the segments of one party and not in those of the other party, said higher rate quantized signal being transmitted in the other party's time slot and the immediately following time slot of said one party. A lower rate of quantization is used if both parties have speech in their respective segments, the lower rate quantized signals being time compressed and transmitted in their associated time slots. By the method being digited throughout the end of a segment coincides substantially with the end of the time slot associated with said segment and thus a delay not exceeding half a segment is incurred. By making the segments have a duration of 2 ms then the method complies with PSTN requirements.
摘要翻译： 公开了一种双工语音传输方法，其中有限带宽传输信道被划分成多个连续的时隙，可用于双方中的每一方的可选呼叫的来自任何一方的语音信号被划分为具有 与所述双方中的一方相关联的时间段在时间上与与所述双方中的另一方相关联的时间段抵消。 存在的语音段数字化并以数字形式存储。 当语音存在于一方的片段而不是另一方的片段中时，使用较高的量化速率，所述较高速率量化信号在另一方的时隙和所述一方的紧随时隙发送。 如果双方在其各自的段中具有语音，则较低的量化速率被使用，较低速率的量化信号被时间压缩并在其相关的时隙中传输。 通过在段的整个末尾被划分的方法基本上与与所述段相关联的时隙的结尾重合，因此引起不超过一半段的延迟。 通过使段的持续时间为2ms，该方法符合PSTN要求。
-
公开(公告)号：US4215265A
公开(公告)日：1980-07-29
申请号：US860476
申请日：1977-12-14
申请人： Philip D. White
发明人： Philip D. White
摘要： An electric kiln for firing ceramic ware in a reducing atmosphere has a substantially sealed chamber with electrical-resistance heating elements. A compartment is provided within the kiln for selectively introducing a reducing agent into the chamber. According to the method, the temperature within the chamber is raised to a predetermined level by energizing the heating elements. Upon attainment of the desired temperature level, a selected quantity of the reducing agent is introduced into the chamber for producing a reducing atmosphere during the maturing of the ceramic ware. As the temperature is raised to a level at which the heating elements would be damaged, a substantially neutral atomsphere is maintained in the chamber. Aslo during cooling, a reducing atmosphere is possible for further reduction of the ware and glazes thereon.
摘要翻译： 用于在还原气氛中烧制陶瓷器的电窑具有基本上密封的具有电阻加热元件的腔室。 在窑内设置一个隔室，用于选择性地将还原剂引入室中。 根据该方法，通过对加热元件通电来使室内的温度上升到预定水平。 达到期望的温度水平后，将选定量的还原剂引入到室中，以在陶瓷制品熟化过程中产生还原气氛。 随着温度升高到加热元件将被损坏的水平，腔室中保持基本上中性的原子层。 在冷却期间，可以进一步减少其上的器皿和釉料的还原气氛。
-
公开(公告)号：US4703324A
公开(公告)日：1987-10-27
申请号：US940215
申请日：1986-12-08
申请人： Philip D. White
发明人： Philip D. White
IPC分类号： H04M1/00 , H04B7/26 , H04M1/727 , H04M1/73 , H04Q7/18 , H04Q7/22 , H04Q7/28 , H04Q7/34 , H04Q7/38 , H04Q7/00 , H04B7/00
CPC分类号： H04M1/727
摘要： In communications systems, such as cordless telephone systems, in which synchronizing signals are transmitted at predetermined intervals on a signalling channel by base stations to say portable, battery-powered receivers, the need to send separate station identification signals is avoided by the synchronizing signals being transmitted from a base station in accordance with a predetermined signalling sequence, for example a pseudo-random sequence, and the receivers using the sequence as a base station identification signal.
摘要翻译： 在诸如无绳电话系统的通信系统中，其中同步信号以预定间隔在基站的信令信道上被发送以表示便携式电池供电的接收机，通过同步信号被避免需要发送单独的站识别信号 根据预定的信令序列（例如伪随机序列）从基站发射，以及使用该序列的接收机作为基站识别信号。
-
6.发明授权High power acoustic wave arrangement with N.sup.2 parallel-series connected acoustic wave devices 失效具有N2并联串联连接声波器件的高功率声波布置
公开(公告)号：US4494031A
公开(公告)日：1985-01-15
申请号：US475800
申请日：1983-03-16
CPC分类号： H03H9/6433 , H03H9/14502 , H03H9/1455
摘要： N.sup.2 acoustic wave devices (A,B,S,T; where N is an integer greater than unity) with substantially the same electrical impedance and transfer characteristics at a given operating frequency are electrically connected in a parallel-series arrangement which has substantially the same electrical impedance and transfer characteristics as any one of the individual N.sup.2 devices, but an increased active device area. The increased active area reduces stress and alleviates acoustically-induced migration in the metal of, for example, transducer electrode fingers (6,7) of resonators at high power levels. The parallel-series arrangement consists of N groups, each of which comprises N devices (A,B or S,T), the corresponding pairs of terminals (4,54 and 54,55) of which are connected in series. Some terminals (54 or 55) may be common to two or more devices and some devices may have merged transducers in which the electrode fingers (6 or 7) of one transducer are a longitudinal extension of the fingers of a parallel transducer. In the case of multi-port devices the input and output terminal pairs may be differently grouped as regards the individual devices to which they belong.
摘要翻译： 在给定工作频率下具有基本上相同的电阻抗和传递特性的N 2声波器件（A，B，S，T;其中N是大于1的整数）以并联串联的方式电连接， 电阻抗和传输特性作为单独的N2器件中的任何一个，但增加的有源器件面积。 增加的有效面积降低了应力并减轻了例如在高功率水平的谐振器的换能器电极指（6,7）的金属中的声学诱导迁移。 并联串联装置由N组组成，每组分别包括N个装置（A，B或S，T），相应的端子对（4,54和54,55）串联连接。 一些端子（54或55）可以是两个或更多个器件的共同的，并且一些器件可以具有合并的换能器，其中一个换能器的电极指（6或7）是平行换能器的手指的纵向延伸。 在多端口设备的情况下，对于它们所属的各个设备，输入和输出端子对可以被不同地分组。
-
-
-
-
-
搜索结果
6 条记录 (耗时 0.022 秒)
