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公开(公告)号：US5228026A
公开(公告)日：1993-07-13
申请号：US573307
申请日：1990-11-26
申请人： Richard Albrow , Nigel E. Barnes , Graham E. Beesley , Chris Cant , Malcolm Crisp , Michael T. Dudek , Rupert Goodings , David C. Odhams , Peter N. Proctor , Ian Rodgers
发明人： Richard Albrow , Nigel E. Barnes , Graham E. Beesley , Chris Cant , Malcolm Crisp , Michael T. Dudek , Rupert Goodings , David C. Odhams , Peter N. Proctor , Ian Rodgers
IPC分类号： H04J3/12 , H04B7/26 , H04J3/00 , H04J3/06 , H04L5/16 , H04L7/04 , H04L7/08 , H04M1/00 , H04M1/02 , H04M1/24 , H04M1/72 , H04M1/725 , H04M1/733 , H04Q7/38
CPC分类号： H04M1/733 , H04J3/0602 , H04J3/0652 , H04M1/72505 , H04L7/041
摘要： A communication procedure suitable for a cordless telephone system involves time division duplex radio communication between a handset 11 and a base station using alternating bursts of transmission over a single radio channel. Once a radio link has been set up, initial transmissions carry a synchronization logical channel S and a signalling logical channel D multiplexed together, but the link may switch to bursts carrying a communications logical channel B for the speech data and the signalling logical channel D. Burst synchronization is achieved by the asynchronous detection of words in a synchronization channel S. These words have bit patterns reducing the probability of incorrect asynchronous detection of them. If one part ceases to receive handset signals from the other, it transmits a special signal, informing the other part. This enables both parts to detect the failure of a link at substantially the same time, so that their actions to re-establish the link are synchronized.
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公开(公告)号：US5123008A
公开(公告)日：1992-06-16
申请号：US322059
申请日：1989-03-13
申请人： Graham E. Beesley
发明人： Graham E. Beesley
摘要： A time division duplex transceiver incorporating a dual conversion superheterodyne receiver, and in which the first receiver local oscillator doubles as the frequency source for the transmitter. The oscillator is a voltage controlled oscillator VCO forming part of a mixer-type phase locked loop. Frequency deviation in the loop is achieved by mixing the VCO output with a selected harmonic of the output of the second receiver local oscillator. The reference oscillator is a crystal controlled oscillator whose output is switched as between transmit mode and receive mode at a switch before being passed to the loop phase detector. The transceiver is able to rapidly and repeatedly alternate between transmit and receive modes and is thus well suited to time division multiplex operation.
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公开(公告)号：US4352030A
公开(公告)日：1982-09-28
申请号：US130932
申请日：1980-03-17
申请人： Graham E. Beesley
发明人： Graham E. Beesley
IPC分类号： G01S7/285 , H03G3/34 , H03K5/1252 , H03K17/30 , H03K5/153 , G01R19/165
CPC分类号： H03K5/1252 , G01S7/285 , H03G3/345 , H03K17/30
摘要： A tracking pulse detector comprising a feedback loop and means for adjustment of the detector bias to compensate for varying input signal levels whereby noise signals present at the input of the detector are maintained below the detector threshold thereby rendering the detector immune to false triggering. An AGC output is taken from a junction between resistors of a voltage divider and a capacitor is connected between the AGC output line and an OV line, the AGC voltage output being related to the total carrier level. The average current in the detector is kept approximately constant independently of supply and signal conditions and the feedback loops adjusts the DC bias of the detector to compensate for varying signal levels, thereby keeping any input noise signals below the detector threshold independent of the level of slow varying carriers. Any carrier level variation faster than the feedback loop time constants are detected.
摘要翻译： 跟踪脉冲检测器，包括反馈回路和用于调整检测器偏置以补偿变化的输入信号电平的装置，由此存在于检测器的输入处的噪声信号保持在检测器阈值以下，从而使检测器免于假触发。 AGC输出取自分压器的电阻之间的结，电容器连接在AGC输出线和OV线之间，AGC电压输出与总载波电平相关。 检测器中的平均电流保持大致恒定，独立于电源和信号条件，并且反馈环路调整检测器的直流偏置，以补偿变化的信号电平，从而保持任何输入噪声信号低于检测器阈值，与缓慢的电平无关 不同的载体。 检测到比反馈回路时间常数快的载波电平变化。
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公开(公告)号：US4334317A
公开(公告)日：1982-06-08
申请号：US129927
申请日：1980-03-13
申请人： Graham E. Beesley
发明人： Graham E. Beesley
摘要： A radio receiver including an RF amplifier stage arranged to receive transmitted RF signals and noise signals from an antenna, a mixer stage for converting the RF signals to intermediate frequency (IF) signals and supplying the IF signals to a blanker gate receiving blanking signals from a blanking signal source, the gate normally passing IF signals to discriminator means to demodulate the IF signals to audio signals, but decoupling the mixer stage from the demodulator when the blanking signal is present. The audio signal output from the discriminator is applied to a noise squelch circuit which detects noise frequencies above a predetermined frequency. If the predetermined frequency is exceeded, a squelch signal is generated to block or mute the audio signals. In the present invention, the squelch circuit employs an averaging detector instead of a peak detector in order to eliminate short duration spikes in the squelch circuit. The blanking signal generator circuit employs a tracking pulse detector which is immune to false triggering by maintaining the detector threshold.
摘要翻译： 一种无线电接收机，包括被布置成从天线接收发射的RF信号和噪声信号的RF放大器级，用于将RF信号转换为中频（IF）信号的混频器级，并将IF信号提供给接收来自 消隐信号源，门正常通过IF信号到鉴频器装置，以将IF信号解调为音频信号，但是当存在消隐信号时，将解调器级与解调器解耦。 从鉴频器输出的音频信号被施加到噪声频率高于预定频率的噪声频率的噪声抑制电路。 如果超过预定频率，则产生静噪信号以阻止或静音音频信号。 在本发明中，静噪电路采用平均检测器代替峰值检测器，以消除静噪电路中的持续时间尖峰。 消隐信号发生器电路采用跟踪脉冲检测器，其通过维持检测器阈值而免于假触发。
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5.发明授权
公开(公告)号：US5363223A
公开(公告)日：1994-11-08
申请号：US982721
申请日：1992-11-27
申请人： Graham E. Beesley
发明人： Graham E. Beesley
IPC分类号： G02F1/133 , G02F1/1335 , G02F1/13357 , G09F13/26 , G09G3/34
CPC分类号： G09G3/3406 , G09G2330/021
摘要： A problem arises in electronic equipment incorporating a display, such as an LCD display, which is not intrinsically illuminated. The present invention provides a controlled backlight for such displays, and is particularly useful in battery-powered equipment where power consumption must be kept to a minimum. The circuitry comprises a display 1 controlled via a conventional display driver 6 from other equipment (not shown) such as a microprocessor. Whenever the display is changed a signal is sent also to a timer circuit 7 which triggers, and passes a control signal to an electronic switch 4 which in turn passes power from a battery 3 to a lamp 2. The lamp 2 is arranged to illuminate the display 1. After a preset period, the timer circuit 7 sends a further control signal to the switch 4 to switch lamp 2 off.
摘要翻译： 在电子设备中出现了一个问题，这个电子设备中并没有内在照明的显示器，例如LCD显示器。 本发明提供了一种用于这种显示器的受控背光，并且在电力供应的设备中特别有用，其功耗必须保持最小。 该电路包括经由来自诸如微处理器的其他设备（未示出）的常规显示驱动器6控制的显示器1。 每当显示改变时，信号也被发送到定时器电路7，定时器电路7触发并将控制信号传递到电子开关4，电子开关4又将电力从电池3传递到灯2.灯2被布置成照亮 显示1.在预设时段之后，定时器电路7向开关4发送进一步的控制信号以关闭灯2。
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公开(公告)号：US5020051A
公开(公告)日：1991-05-28
申请号：US451749
申请日：1989-12-18
CPC分类号： H04M1/72505
摘要： A method of establishing a digital time-division duplex radio communication link between one of a plurality of portable units and a base unit in a cordless telephone system, transmissions from the base unit are allowed only on a ping-pong basis with transmission bursts from all the active transmitters in the base unit being synchronized with one another. This prevents blocking of receiver sections due to co-sited transmitters transmitting at the same time on a different channel. The difficulty of synchronizing the transmission bursts of the active portable units with their respective transceivers within the base unit is overcome by allowing the portable unit to make an initial continuous call comprising multiple identical sequences of data containing units small enough to be completely received within the limited reception windows of the base unit. After the initial call has started communication, an exchange of signals takes place on a ping-pong basis to establish synchronism between the portable unit and base unit. Finally, if all is well, the system reverts to a speech mode in which voice signals rather than data signals are exchanged between the portable unit and base unit.
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公开(公告)号：US4554665A
公开(公告)日：1985-11-19
申请号：US465867
申请日：1983-02-07
申请人： Graham E. Beesley
发明人： Graham E. Beesley
CPC分类号： H04L1/20
摘要： A data processing system of the kind in which there is a transmission of a code format having a pattern that provides a plurality of reversals 10101100 etc. from which it is desirable to be able to differentiate between valid data and invalid data. Invalid data means the absence of data, data corrupted by noise or data alien to the system. The system is characterized by means arranged to provide the times between n zero crossings as given by the expression: ##EQU1## where I is the integer part of x, n is an integer representing the number of zero crossings and t.sub.i is the duration of the ith interval between zero crossings measured on a bit base of unity thereby to permit the use of said number (R) when compared with a predetermined tolerance range to provide an indication of the quality of said transmission.
摘要翻译： PCT No.PCT / GB82 / 00159 Sec。 371日期1983年2月7日 102（e）日期1983年2月7日PCT提交日期为1982年5月28日PCT公布。 第WO82 / 04513号公报 日期：1982年12月23日。一种数据处理系统，其中存在具有提供多个反转10101100等的模式的代码格式的传输，期望从其中区分有效数据和 无效数据。 数据无效意味着数据不存在，数据被噪声或与系统外部的数据相冲突。 该系统的特征在于设置为提供n个过零点之间的时间，由以下表达式给出：
其中I是x的整数部分，n是表示过零次数的整数，ti是 在单位的基底上测量的零交叉之间的第i个间隔，从而允许当与预定的公差范围相比时使用所述数量（R），以提供所述传输的质量的指示。 -
8.发明授权Method of establishing a communication link in a digital cordless telephone system 失效在数字无绳电话系统中建立通信链路的方法
公开(公告)号：US5583854A
公开(公告)日：1996-12-10
申请号：US379674
申请日：1995-04-04
申请人： Graham E. Beesley
发明人： Graham E. Beesley
CPC分类号： H04M1/72505
摘要： A digital time-division duplex radio communication link is established or re-established between one of a plurality of portable units and one or more base units forming a cordless telephone system, so as to avoid potential interference created by the use of an unsynchronized call-up transmission in the presence of synchronized signals being exchanged by the rest of the system. The call-up transmission is pre-synchronized with the rest of the system so that switchovers between transmission bursts and reception windows occur at the same time as between the call-up signal and the rest of the system. This is achieved by deriving synchronization information from a synchronization signal which may, for example, be an existing signal on the system containing synchronization information (i.e., an existing call on the system) or may be a beacon signal which, in some systems, is transmitted by the fixed units for the purpose of range indication. The method is particularly applicable to the MUX1/MUX2/MUX3 format of signals used in the CT2 common air interface protocol.
摘要翻译： PCT No.PCT / GB93 / 01749 Sec。 371日期：1995年4月4日 102（e）1995年4月4日PCT PCT 1993年8月18日PCT公布。 公开号WO94 / 05107 日期1994年3月3日在多个便携式单元之一和形成无绳电话系统的一个或多个基座单元之间建立或重新建立数字时分双工无线电通信链路，以避免由使用产生的潜在干扰 在存在由系统的其余部分交换的同步信号的情况下，不同步的呼叫传输。 呼叫传输与系统的其余部分预先同步，从而在呼叫信号与系统的其余部分之间的同时发生传输突发和接收窗口之间的切换。 这通过从同步信号中导出同步信息来实现，该同步信号例如可以是包含同步信息（即，系统上的现有呼叫）的系统上的现有信号，或者可以是在一些系统中的信标信号 由固定单元传输，用于范围指示。 该方法特别适用于CT2通用空中接口协议中使用的MUX1 / MUX2 / MUX3格式的信号。
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公开(公告)号：US4555677A
公开(公告)日：1985-11-26
申请号：US596270
申请日：1984-04-03
申请人： Graham E. Beesley
发明人： Graham E. Beesley
摘要： An amplifier for use in the I.F. stages of an F.M. radio receiver comprises several identical direct-coupled stages 2,4,6 each comprising common emitter transistors 8 and inductive loads 10.
摘要翻译： 放大器用于I.F. F.M.的阶段 无线电接收机包括几个相同的直接耦合级2,4,6，每个包括公共发射极晶体管8和感性负载10。
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公开(公告)号：US4373139A
公开(公告)日：1983-02-08
申请号：US130931
申请日：1980-03-17
申请人： Graham E. Beesley
发明人： Graham E. Beesley
CPC分类号： H03G3/3052 , G01R19/22 , H03D1/18 , H03G3/341
摘要： An averaging detector having a first transistor having a first resistor connected across the base and emitter, a first capacitor connected in a signal input line and to the base of a second transistor, the collectors of the first and second transistors being connected to a positive voltage line and the base of the first transistor being connected to an output voltage line, together with the emitter of the second transistor via a second resistor, an inhibit switch comprising a third transistor being connected between the base of the second transistor and a zero voltage line, a third resistor and second capacitor being connected in parallel between the zero voltage line and the output voltage line, the arrangement being such that on application of a voltage greater than the threshold voltage of the first transistor successive positive and negative cycles alternately reverse bias and forward bias the first and second transistors to achieve a balance between the half cycle charging through the second resistor and the continuous discharge through the third resistor to thereby provide a DC output proportional to the average input voltage waveform envelope.
摘要翻译： 一种平均检测器，具有第一晶体管，其具有连接在基极和发射极两端的第一电阻器，连接在信号输入线路中的第一电容器和第二晶体管的基极，第一和第二晶体管的集电极连接到正电压 并且所述第一晶体管的基极经由第二电阻器与所述第二晶体管的发射极一起连接到输出电压线;禁止开关，包括连接在所述第二晶体管的基极和零电压线之间的第三晶体管 在所述零电压线和所述输出电压线之间并联连接的第三电阻器和第二电容器，所述布置使得在施加大于所述第一晶体管的阈值电压的电压时，连续的正和负周期交替反向偏置， 正向偏置第一和第二晶体管以实现半周期充电之间的平衡 第二电阻器和通过第三电阻器的连续放电，从而提供与平均输入电压波形包络成比例的DC输出。
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