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Improvements in or relating to indicator systems
Improvements in or relating to indicator systems
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机译：指标体系或与指标体系有关的改进
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1,128,753. Cathode-ray tube indicators. MINISTER OF TECHNOLOGY. 7 March, 1967 [7 March, 1966], No. 9891/66. Heading H4T. In a cathode-ray tube indicator system the value of an analogue voltage is indicated by the angular position of a radial trace which is produced by the collapse of a circular scanning field when the analogue voltage is employed to inhibit, temporarily and at a time in the scan cycle determined by its magnitude, the application of the deflection signal to the tube. The beam is normally blanked and a bright-up pulse is applied to the tube simultaneously with and for the duration of the inhibition of the scanning signals. When two or more analogue voltages are to be displayed the duration of inhibition (and of the bright-up pulse) is different for each voltage so that the latter may be distinguished by traces of different lengths. Fig. 1 (Prov.) shows the general scheme in which phase shifters 1, 2, supply the +45 degree and - 45 degree phases of a reference signal to the orthogonal deflection means (plates or coils) of the display tube 4 via inhibit circuits 3, the reference signal also controlling the production of pulses in generator 5 which are width-modulated in 6 by the analogue signal and employed to produce in generator 7 pulses controlling the inhibit circuits and beams brightening pulses. In a modification of this arrangement (Fig. 2, Prov.) the reference pulse generator 5 is controlled by the same 400 c/s. signal from which the deflection waveforms are derived by squaring the 400 c/s. signal at 14 and then dividing-by-four in bistable circuits 15, 16. A further bi-stable circuit 17 supplies pulses which operate switches 19, 22, alternately, to supply to a combining circuit 20 the analogue signal (channel 1) and the latter signal plus its first derivative (channel 2). The combining circuit thus controls the pulse width modulator 6 which produces pulses the trailing edges of respective ones of which are determined by the magnitude of the output of the switches 19, 22 alternately operative. These trailing edges determine the leading edges of inhibit pulses produced in generator 7 and the latter is controlled via a switch 12 by means of a reference voltage and the switching signal supplied to switch 19 such that when switch 19 is closed the length of the inhibit pulse is greater than when switch 22 is closed. Thus the trace indicative of the channel 1 information is longer than that appertaining to channel 2 and where the analogue signal is derived from an aircraft altimeter the angular position of the channel 1 trace indicates the height of the aircraft whilst the channel 2 trace, which is produced by a voltage indicative of height plus a voltage indicative of the rate of change of height indicates the latter (i.e. rate of change of height) by its angular relationship to the channel 1 trace. The absolute angular position of the channel 2 trace then indicates the probable height a short time ahead. In a further embodiment (Fig. 5) the inputs from the two channels are supplied to comparators 28, 29 fed with a ramp staircase waveform from generator 27 to provide outputs to respective ones of monostable circuits 30, 31, the former one 30 of which has a longer period than circuit 31 so that the trace indicative of channel 1 information is longer than that indicative of channel 2 information. The inhibit circuits 3 (described with reference to the circuit of Fig. 4, Prov., not shown) include R.C. time-constant circuits which cause the scanning fields to decay exponentially when inhibited so that a usable trace is produced. The display of the present invention may be produced in one corner of a large screen tube on the remainder of which other information may be displayed either in time-division multiplex or by means of a second electron beam.
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机译：1,128,753。阴极射线管指示器。科技部长。 1967年3月7日[1966年3月7日]，编号9891/66。标题H4T。在阴极射线管指示器系统中，模拟电压的值由径向轨迹的角位置指示，该径向轨迹是由圆形扫描场的塌陷而产生的，该径向扫描轨迹是在使用模拟电压来暂时和暂时抑制电压时产生的。扫描周期取决于其大小，将偏转信号施加到电子管上。光束通常是消隐的，并且在抑制扫描信号的同时以及在抑制扫描信号的过程中，向管施加亮脉冲。当要显示两个或多个模拟电压时，每个电压的抑制持续时间（和亮脉冲的持续时间）是不同的，因此可以通过不同长度的迹线来区分后者。图1（Prov。）示出了一般方案，其中移相器1、2通过抑制将参考信号的+45度和-45度相位提供给显示管4的正交偏转装置（板或线圈）。在电路3中，参考信号还控制发生器5中的脉冲的产生，该脉冲在发生器6中被模拟信号进行宽度调制，并被用于在发生器7中产生控制禁止电路和光束增亮脉冲的脉冲。在这种布置的变型中（图2，Prov。），参考脉冲发生器5由相同的400c / s控制。通过对400 c / s进行平方可以从中得出偏转波形的信号。信号在14处，然后在双稳态电路15、16中被四分频。另一个双稳态电路17提供脉冲，这些脉冲交替地操作开关19、22，以将模拟信号（通道1）和混合信号提供给组合电路20。后一个信号加上其一阶导数（通道2）。因此，组合电路控制脉冲宽度调制器6，该脉冲宽度调制器6产生脉冲，该脉冲的后沿由交替操作的开关19、22的输出的大小确定。这些后沿确定了在发生器7中产生的抑制脉冲的前沿，后者通过开关12借助于参考电压和提供给开关19的开关信号来控制，使得当开关19闭合时，抑制脉冲的长度大于开关22闭合时的值。因此，表示通道1信息的迹线要比通道2的迹线长，并且在模拟信号是从飞机高度计得出的情况下，通道1迹线的角位置表示飞机的高度，而通道2迹线是由表示高度的电压加上表示高度的变化率的电压产生的电压通过其与通道1迹线的角度关系来表示后者（即，高度的变化率）。然后，通道2轨迹的绝对角位置指示了可能在不久的将来的高度。在另一实施例中（图5），来自两个通道的输入被提供给比较器28、29，比较器28、29被馈送有来自发生器27的斜坡阶梯波形，以将输出提供给单稳态电路30、31中的相应一个，其中前一个30具有比电路31更长的周期，使得指示信道1信息的迹线比指示信道2信息的迹线长。禁止电路3（参考图4的电路进行描述，Prov。，未示出）包括R.C。时间常数电路，在被抑制时会导致扫描场呈指数衰减，从而产生可用的迹线。本发明的显示器可以在大屏幕管的一个角落中产生，在其其余部分可以时分多路复用或借助于第二电子束显示其他信息。
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