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41. 发明授权

US5625884A Global paging with reverse virtual call setup in wireless personal communications 失效
标题翻译：在无线个人通信中使用反向虚拟呼叫建立的全局寻呼
公开(公告)号：US5625884A
公开(公告)日：1997-04-29
申请号：US255684
申请日：1994-06-08
申请人： Richard D. Gitlin , Chih-Lin I
发明人： Richard D. Gitlin , Chih-Lin I
IPC分类号： H04W68/00 , H04B7/00
CPC分类号： H04W68/00
摘要： A method and apparatus providing communications between mobile units and other communications devices, is disclosed wherein, in response to a request to call a mobile unit from an originating communications device, a paging signal is sent via a global communications network and received by a mobile unit. The paging signal contains caller and callee identification codes, which are decoded by the mobile unit. A paging response signal, in the form of a reverse call setup signal, is then transmitted from the mobile unit to the originating communications device. Transmission of the paging signal is preferably stopped when a correspondence condition exists such that the caller and callee identification codes of the paging signal correspond to the caller and caller identification codes of the paging response signal.
摘要翻译：公开了一种在移动单元和其他通信设备之间提供通信的方法和装置，其中响应于从始发通信设备呼叫移动单元的请求，经由全球通信网络发送寻呼信号并由移动单元接收。寻呼信号包含由移动单元解码的呼叫者和被叫者识别码。然后，以反向呼叫建立信号的形式的寻呼响应信号从移动单元发送到始发通信设备。当存在呼叫信号的呼叫者和被呼叫者识别码对应于呼叫者和寻呼响应信号的呼叫者识别码时，寻呼信号的发送最好停止。

42. 发明授权

US5119196A Ghost cancellation of analog TV signals 失效
标题翻译： GHOST取消模拟电视信号
公开(公告)号：US5119196A
公开(公告)日：1992-06-02
申请号：US542612
申请日：1990-06-25
申请人： Ender Ayanoglu , Israel Bar-David , Richard D. Gitlin , Chih-Lin I , Jack H. Winters
发明人： Ender Ayanoglu , Israel Bar-David , Richard D. Gitlin , Chih-Lin I , Jack H. Winters
IPC分类号： H04N5/21
CPC分类号： H04N5/211
摘要： Ghosts are canceled in received analog TV (for IDTV, EDTV, and HDTV) signals by utilizing the fact that there are short periods of time without the analog signals (the horizontal flyback interval between the lines) to process the received signal on a line-to-line basis using a finite impulse response (FIR) or an infinite impulse response (IIR) equalizer. This line-by-line processing (which can be implemented by periodic cleansing of the equalizer) overcomes the limitations of standard equalizers to allow for 40-50 dB of suppression of ghosts, even with nulls in the spectrum, as long as the ghost delay is less than the period of time without the analog signal. Furthermore, by using time inversion in combination with line-by-line processing, the stability problem of the conventional IIR equalizer is eliminated. The IIR equalizer may be implemented on a single digital integrated circuit. Alternatively, an FIR equalizer can be used which, although it may require multiple chips (i.e., more taps), can acquire and adapt to the ghosted channel more rapidly than an IIR equalizer. With line-by-line processing, FIR and IIR equalizers can eliminate any ghost with delays up to 11 .mu.sec in IDTV or EDTV. For larger delays, a standard IIR or FIR equalizer can be used as a preprocessor to eliminate small ghosts and an adaptive antenna can be used to eliminate large ghosts. Thus, with these techniques, the ghosting problem can be eliminated in all TV receivers.

43. 发明授权

US5107493A High-speed packet data network using serially connected packet and circuit switches 失效
标题翻译：使用串行连接分组和电路开关的高速分组数据网络
公开(公告)号：US5107493A
公开(公告)日：1992-04-21
申请号：US389191
申请日：1989-08-02
申请人： Kai Y. Eng , Richard D. Gitlin
发明人： Kai Y. Eng , Richard D. Gitlin
IPC分类号： H04L12/56
CPC分类号： H04L12/56
摘要： A cross connect network is utilized in order to switch packets of information among a plurality of network nodes. Each of the plurality of network nodes generates a multiplexed data signal, where each multiplexed data signal includes several channels. The cross connect network routes the data packets based upon which channel each packet is in when it arrives from the network node, rather than based upon the address in each packet. Thus, the need to read the address and switch the packet at each switching stage in the cross connect network is eliminated.

44. 发明授权

US4924492A Method and apparatus for wideband transmission of digital signals between, for example, a telephone central office and customer premises 失效
标题翻译：在例如电话中心局和客户驻地之间宽带传输数字信号的方法和装置
公开(公告)号：US4924492A
公开(公告)日：1990-05-08
申请号：US171636
申请日：1988-03-22
申请人： Richard D. Gitlin , Sailesh K. Rao , Jean-Jacques Werner , Nicholas Zervos
发明人： Richard D. Gitlin , Sailesh K. Rao , Jean-Jacques Werner , Nicholas Zervos
IPC分类号： H04L25/49 , H04L27/00 , H04L27/34 , H04M3/00 , H04M11/00
CPC分类号： H04L27/3438 , H04L25/4921
摘要： In a telephone local loop transmission arrangement, data is communicated from the customer premises to the central office utilizing a multi-dimensional, passband signal illustratively at 480 kb/s and 1.544 Mb/s.

45. 发明授权

US4924480A Codecs with suppression of multiple encoding/decodings across a connection 失效
标题翻译：编解码器通过连接抑制多个编码/解码
公开(公告)号：US4924480A
公开(公告)日：1990-05-08
申请号：US166867
申请日：1988-03-11
申请人： Steven L. Gay , Richard D. Gitlin , John Hartung
发明人： Steven L. Gay , Richard D. Gitlin , John Hartung
IPC分类号： H04B14/04 , H04Q3/42 , H04Q11/04 , H04W88/18
CPC分类号： H04W88/181 , H04B14/046 , H04Q11/04
摘要： In a private telecommunications network, a plurality of digital PBXs are interconnected via pairs of codecs. The codecs of each pair, or "tandem", are each operative to encode 64 kilobit/second (kbps) mu-law speech so as to compress it to 16 kbps speech for transmission to the other codec in the tandem. The latter is operative to thereafter decompress the 16 kbps speech back to 64 kbps. Each codec has a second mode of operation in which, rather than decode the encoded speech, it preserves the bits thereof in its own output signal. The codec transitions to this mode whenever it recognizes the presence of another codec on its high-bit-rate side of the connection. As a result, only one encoding/decoding cycle is performed across the connection, thereby minimizing the speech-coding-induced distortion and delay therein. The mechanism enabling a codec to communicate its presence to another codec on its high-bit-rate side of the connection is based on the transmission of predetermined synchronization patterns inserted in the signals it outputs in that direction. In a second embodiment, codecs of the above-described type are used in a cellular mobile radio telecommunications system.

46. 发明授权

US4334313A Timing recovery technique 失效
标题翻译：定时恢复技术
公开(公告)号：US4334313A
公开(公告)日：1982-06-08
申请号：US185016
申请日：1980-09-08
申请人： Richard D. Gitlin , Howard C. Meadors, Jr.
发明人： Richard D. Gitlin , Howard C. Meadors, Jr.
IPC分类号： H04L7/02 , H04B3/04
CPC分类号： H04L7/0058
摘要： In a first data receiver (10), sampling circuitry (20, 25, 35) forms samples of a received data signal representing a succession of data symbols. The samples are formed at twice the symbol rate. Transversal filter circuitry (251, 261) operates on the samples by multiplying them by respective ones of a queue of coefficients. Further circuitry (55, 60, 65, 70, 252, 262), operative in response to the resulting products, forms decisions as to the values of the transmitted symbols and updates the values of the coefficients. Timing recovery circuitry (40) periodically identifies the largest of the coefficients in magnitude and either advances or retards the operation of the sampling circuitry by a fixed step size depending on whether that coefficient is or is not within a predetermined portion of the queue. Timing recovery circuitry (830) within a second data receiver (100) operates in a similar manner, but employs a step size whose magnitude is determined by the position of the largest coefficient relative to the center of the coefficient queue.
摘要翻译：在第一数据接收器（10）中，采样电路（20,25,35）形成表示一系列数据符号的接收数据信号的采样。样品以符号率的两倍形成。横向滤波器电路（251,261）通过将它们乘以系数队列中的相应的一个来对样本进行操作。响应于所得到的产品可操作的进一步的电路（55,60,65,70,252,262）形成关于发送符号的值的决定并更新系数的值。定时恢复电路（40）周期性地识别幅度中最大的系数，并且取决于系数是否在队列的预定部分内或者不在队列的预定部分内，使采样电路的操作前进或延迟固定的步长。第二数据接收器（100）内的定时恢复电路（830）以类似的方式操作，但采用其幅度由相对于系数队列的中心的最大系数的位置确定的步长。

47. 发明授权

US4253184A Phase-jitter compensation using periodic harmonically related components 失效
标题翻译：使用周期性谐波相关元件的相位抖动补偿
公开(公告)号：US4253184A
公开(公告)日：1981-02-24
申请号：US91832
申请日：1979-11-06
申请人： Richard D. Gitlin , Stephen B. Weinstein
发明人： Richard D. Gitlin , Stephen B. Weinstein
IPC分类号： H04L27/22 , H04B3/06 , H04L27/01 , H04L27/38 , H03K5/159 , H04B3/14
CPC分类号： H04L27/01
摘要： A quadrature amplitude-modulated (QAM) data signal receiver employs a phase compensation arrangement (16, 31, 33) before the equalizer (17). The arrangement utilizes the assumption that the frequency components typically present in the phase perturbance are power-line related. This enables an effective phase compensator to be of relatively low complexity compared to the equalizer (17). Since the compensator is "pretuned", only the phase and amplitude of the frequency components need be adaptively found. This makes for a relatively stable arrangement with a suitable convergence rate. In an alternative arrangement, a phase compensator (216, 233, 240) is provided for use after the equalizer (217).
摘要翻译：正交幅度调制（QAM）数据信号接收机在均衡器（17）之前采用相位补偿装置（16,33,33）。该布置利用了通常存在于相位扰动中的频率分量与电力线相关的假设。与均衡器（17）相比，这使得有效的相位补偿器具有相对低的复杂度。由于补偿器是“预调”，所以只能自适应地发现频率分量的相位和幅度。这使得具有适当收敛速度的相对稳定的布置。在替代布置中，提供相位补偿器（216,233,240）以在均衡器（217）之后使用。

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