JP2537194B2 - Zero correction circuit for digital / synchronous converter - Google Patents

Description

The present invention relates to a zero correction circuit for a digital / synchronous converter.

[Prior Art] As for the technology relating to the conventional digital / synchronous converter, as described in JP-A-55-119798, JP-A-56-103796, and JP-A-57-17098, It relates to the signal conversion technology or the signal stabilization method, and does not consider the correction method for shifting the zero point of the synchronized signal.

[Problems to be Solved by the Invention] Generally, the maximum value of a synchro signal is 360 °,
There are many cases in which the zero of the signal corresponds to 0 ° and the indicated value per 1 ° is defined. However, in the application that does not use the range where the signal value is small, the signal value corresponding to the synchronization angle of 0 ° is set to the minimum value. It may be fixed and used at an appropriate value between the maximum value and the maximum value. For example, in an application in which a distance (maximum value 7,200 m) is represented by a synchro signal, the correspondence between the distance value and the synchro angle is normally as shown in FIG. However, when the short distance range is not used, the synchronization angle 0 ° is defined as 900 m and used as shown in FIG. When the synchronization zero point cannot be matched due to such a specification change of the device for receiving the synchro signal, the program of the transmission side device is usually corrected and dealt with. However, if there is not enough time for work such as program correction, it is necessary to manually adjust it by human intervention, but the prior art does not take this into consideration, and adjustment is difficult. There's a problem.

The purpose of the present invention is to change the program etc.
It is an object of the present invention to provide a zero-point correction circuit for a digital / synchronous converter that can easily change the zero point of the synchro.

[Means for Solving Problems] The above object is to calculate the calculated value data output from the computer,
In a digital / synchronous converter for converting the maximum value of the calculated value data to a synchro angle of 360 ° and converting the zero point of the calculated value data to a synchro signal corresponding to a synchro angle of 0 °, it corresponds to the synchro angle of 0 °. Zero point correction value setting means for setting the magnitude of the movement amount as a correction value when moving the zero point of the calculated value data by an arbitrary amount, and the zero point correction value setting means for the calculated value data output from the computer. The set correction value is added, the calculated value data is corrected to the data from the corrected zero point, and digital / digital
This is achieved by configuring a zero point correction circuit with the addition means for outputting to the synchro converter.

[Operation] The data calculated by the program is corrected to data in which the zero point is corrected by the adding means, and this is converted into a synchro signal. As a result, there is no need to change the program to correct the zero point.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a block diagram of a zero correction circuit according to an embodiment of the present invention.

The zero point correction circuit 4 according to the present embodiment includes a register 5 for temporarily holding an electronic computer output signal 12 representing a calculation result of an electronic computer, switch groups 6a to 6n for setting a moving amount of a zero point as a correction value, A sign inversion circuit 14 that inverts the sign of the correction value, a register 7 that stores a constant value used when converting the correction result into a value within an angle of 360 °, and a register 5.
Computer output signal 12 and switch groups 6a-6n held in
And the value whose sign is inverted by the sign inverting circuit 14 are added, and when the addition result is 360 ° or more (minus angle), the constant value in the register 7 is added to the addition result as described later. Adder 8 and AND circuits 9a to 9e, OR circuits 10a to 10c, and delay line 1 for controlling these operations.
1a to 11c, and the adder 8 outputs a negative sign bit to the one input terminal of each AND circuit 9a to 9e when the output of the adder 8 is negative, and outputs a positive sign bit when it is zero or more. The digital signal output from the adder 8 of the zero correction circuit 4 is temporarily held in the input register 1 by the input instruction pulse 13, as described later, and converted by the digital / synchro converter 2 into a synchro signal.

Next, the circuit operation of the zero correction circuit 4 having the above-mentioned configuration will be described.

When the zero correction circuit 4 according to the present embodiment is used in the relationship of FIG. 3 described above, the distance 900m which is the result calculated by the electronic calculator or the like is the digital / synchronized unless the movement amount is corrected. The angle is converted to 45 ° by the converter 2 and the receiving side recognizes it as 1800m.

In order to recognize this as 900 m, it is necessary to correct the synchro angle to 0 ° by the zero correction circuit 4. For this reason, in this embodiment, an angle of 45 ° (see FIG. 2) corresponding to 900 m before correction is preset as a correction value by binary data by the switch groups 6a to 6n. The sign of the correction value is inverted by the sign inverting circuit 14, and a value −45 ° having the same absolute value as the correction value but a different sign is input to the adder 8 via the AND circuit 9a and the OR circuit 10a.

On the other hand, an electronic computer output signal 12 having data representing the uncorrected angle (45 °) corresponding to the calculated value of 900 m by the electronic computer is held in the register 5 by the input instruction pulse 13, and the output of the register 5 is AND circuit. It is input to the other input terminal of the adder 8 via 9d and the OR circuit 10b.

As a result, the addition result of the adder 8 becomes zero. The input instruction pulse 13 receives a delay equal to or longer than the operation time of the adder 8 on the delay line 11c, and opens when the output sign bit of the adder 8 is other than negative. The AND circuit 9e and the OR circuit 10c open the input register 1 To start. As a result, the addition result data of the adder 8 is temporarily held in the input register 1 and then converted by the digital / synchronization converter 2 into a synchro signal indicating 0 °. The receiving side recognizes 900 m by the indicated value 0 ° of the synchronizing signal.

Angle 90 before correction corresponding to the calculated value of 1800 m by electronic calculator
When ° is input to the adder 8 as the output signal 12 of the electronic computer, the input and the other input (-45 °) are added,
It becomes 45 °, and a synchro signal indicating 45 ° is output.

When the uncorrected angle 10 ° corresponding to the computer 200m of the electronic computer is input to the adder 8 as the electronic computer output signal 12, the input and the other input (-45 °) are added to become -35 °. . When the addition result has a negative value, the AND circuits 9a and 9d are closed by the output of the sign bit of the adder 8 and the AND circuits 9b and 9c are opened. As a result, the constant value of the register 7 (the value corresponding to 360 °) is input to the adder 8 via the OR circuit 10a. On the other hand, the previous addition result is AND
The signal is input from the other input terminal of the adder 8 via the circuit 9c and the OR circuit 10b, and the addition is performed again. The result of the re-addition is further delayed by the time t by the delay line 11a, and the adder 8
AND circuit 9f and OR circuit 10c opened only when the result of is negative
The signal is held in the input register 1 by the input instruction pulse 13 passing through and is converted into the synchro signal by the digital / synchro converter 2. Input instruction pulse 1 that passed through delay line 11a
The signal 3 is further delayed by the delay line 11b for a time that allows for the conversion time of the digital / synchronous converter 2, and becomes the next input request signal 15 to the electronic computer.

[Effects of the Invention] According to the present invention, when a change in the synchronization zero point occurs, it is possible to deal with the change only by operating the correction value setting means without changing the program. It is possible to eliminate the work such as the accompanying correction, recompilation, and debugging, and it is possible to easily respond to an urgent handling request. Further, even in the initial program design, the design can be performed without paying attention to the synchro zero, and the program structure is simplified and the program creation efficiency is improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a zero point correction circuit according to an embodiment of the present invention, FIG. 2 is a relationship diagram between an output value (distance) of a computer before zero point movement correction and a synchro angle, and FIG. 3 is a zero point. It is a relationship diagram between the output value (distance) of the computer after movement correction and the synchro angle. 1 ... Input register, 2 ... Digital / synchronous converter, 4 ... Zero correction circuit, 5 ... Register, 6 ... Switch (correction value setting means), 7 ... Constant value register, 8 ...
… Adder, 9 …… AND circuit, 10 …… OR circuit, 11 …… Delay line, 12 …… Computer output signal, 13 …… Input instruction pulse, 14 …… Sign inversion circuit, 15 …… Input request signal .

Claims (1)

(57) [Claims] 1. A calculation value data output from a computer is converted into a synchronization signal in which a maximum value of the calculation value data is associated with a synchro angle of 360 ° and a zero point of the calculation value data is associated with a synchro angle of 0 °. In the digital / synchronous converter, a zero point correction value setting means for setting the magnitude of the movement amount as a correction value when the zero point of the calculation value data corresponding to the synchro angle is moved by an arbitrary amount; Adding means for adding the correction value set by the zero point correction value setting means to the calculated value data outputted from the above, correcting the calculated value data into data from the corrected zero point and outputting to the digital / synchronous converter And a zero point correction circuit for a digital / synchronous converter.