JPS5926137B2 - Numerical counting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a numerical counting device suitable for displaying fares including basic fares, such as taxi fares or gas fares.

As is well known, taxi fares or gas charges are composed of a basic fare and a charge (unit price) for the distance traveled or usage fee.
The total amount is the so-called payment fee.

By the way, these charges are frequently revised, and the conventionally commonly used mechanical meters need to be repaired each time, resulting in considerable repair costs each time. The present invention has been made in view of the problems with conventional numerical counting devices such as mechanical meters, and proposes an electronic numerical counting device that does not require any particular modifications in response to rate revisions. be.

Below, the configuration and operation of the numerical counting device according to the present invention will be explained in detail using the drawings. The figure shows a block diagram of a numerical counting device according to the present invention. , a local oscillation circuit 6, a frequency mixing circuit 1, a programmable counter 8 consisting of a subtraction counter, and a decoder 9. 1
0, a decoder 11 that decodes the contents of the counter 10;
and a second display section including a frequency counter 13, a decoder 14, and a display 15. In addition, 1 in the figure
6 is a terminal to which the variable value N is applied, and IT is an output terminal.
According to the numerical counting device of the present invention having the above configuration, charges including the basic charge are counted and displayed in the following manner. In the illustrated circuit, if a signal with a frequency Fs is output from the reference frequency oscillation circuit 1, this output signal is frequency-divided by the frequency dividing circuit 2.

When the number of frequency dividing stages of the frequency dividing circuit 2 is P, the frequency of the signal output from the frequency dividing circuit 2 is Fs/2P, and this signal is applied to one input terminal of the phase comparator circuit 3. on the other hand,
The signal of frequency FO outputted to the output terminal 17 and the signal of frequency FL outputted from the local oscillation circuit 6 are mixed in the frequency mixing circuit 7, and the frequency of the difference between the frequencies of both signals is mixed from the frequency mixing circuit T. A signal (FO-FL) having the same value is output and added to the programmable counter 8.

By the way, the programmable counter 8 includes the counter 1.
0 is input through the decoder 9, and the programmable counter 8 counts down the input variable N using the frequency (FO-FL signal) input from the frequency mixing circuit 7.

Then, when the content becomes zero, a pulse whose output signal level is inverted from high level to low level is output, and this pulse is applied to the phase comparator circuit 3 and the decoder 9. The decoder 9 inputs the above pulse signal to the counter 10.
The programmable counter 8 inputs the contents again, but this operation is delayed by half a cycle from the frequency (FO-FL) of the signal input from the frequency mixing circuit 7.

The output level of programmable counter 8 is the same as that of counter 1.
By setting (inputting) the contents of 0, the low level returns to the high level, and the operation of down-counting the set variable N with the frequency (FO-FL signal) is executed again.

By repeating the above operations, the frequency of the output pulse output from the programmable counter 8 is (FO
He will appear as 1FL)/N. In addition, counter 10
The contents of are also added to the display 12 via the decoder 11, and the variable N is displayed on the display 12. Phase comparison circuit 3
compares the phases of the signal output from the frequency dividing circuit 2 with a frequency of Fs/2P and the signal output from the programmable counter 8 with a frequency of (FO-FL)/N, and determines whether the frequencies of the two signals are different. In this case, the low-pass filter circuit 4 outputs a voltage higher or lower than the predetermined potential.

The oscillation frequency of the voltage-controlled oscillation circuit 5 is controlled by this voltage, and therefore, a signal with a frequency FO corresponding to the output voltage of the low-pass filter circuit 4 is applied to the output terminal 17. That is, the phase comparator circuit 3, the low-pass filter circuit 4, the voltage-controlled oscillator circuit 5, the frequency mixing circuit 7, and the programmable counter 8 form a closed loop, and the frequency divider circuit 2
The output signal frequency F8/2P of the programmable counter 8 is made to match the output signal frequency (FO-FL)/N of the programmable counter 8, and the following equation holds true. From equation (1), the frequency F of the signal applied to the output terminal 17 is:

It will come as a dove.

That is, the above closed loop operates as a frequency synthesizer section.

The frequency FO signal thus applied to the output terminal 17 is counted by the frequency counter 13, and the counted contents are added to the display 15 via the decoder 14.
It is displayed on the display 15.

In the numerical counting device that performs the above operations, for example, the frequency FL is made to correspond to the basic charge, N is made to correspond to the mileage (Km), and Fs/2P is made to correspond to the charge per unit h (unit price). ) is expressed as FO - basic fare + (mileage distance x unit price) (3), and FO pays the fare itself.

That is, the display on the display 15 shows the fare, and in the end,
The numerical counting device of the present invention has the function of a taxi meter. Note that terminal 1 connected to counter 10
Needless to say, the travel distance N (Km) is inputted in the field 6 using the corresponding number of pulses, and in this case, the display 12 operates as a travel distance display. In addition, when the numerical counting device of the present invention is used as a gas rate display meter, the frequency FL is the basic rate, N is the amount of gas used (a), and Fs/2P is the unit price per M゜. If each is dealt with, FO will collect the gas usage fee.

When such a numerical counting device is used as a charge display device that includes basic charges, even if there is a change in the unit price or the basic charge, or both, the unit price cannot be revised in accordance with F8/2P.
Therefore, it is sufficient to change the oscillation frequency F8 of the reference frequency oscillation circuit, and the basic charge can be corrected by changing the oscillation frequency FL of the local oscillation circuit 6.

Furthermore, if you change both, you can modify both the unit price and the basic charge at the same time. All of these modifications can be made by adjusting the variable circuit elements, and unlike conventional mechanical meters, there is no need to modify the mechanism, and the problem of costly modifications is eliminated. It no longer occurs.
Above, the case where the numerical counting device according to the present invention is used in a taxi fare meter or a gas fare meter has been explained as an example.
It can be widely used for displaying numerical values that include a basic charge or basic numerical value and need to display an amount or numerical value obtained by adding usage charges or variable numerical values to the basic charge or basic numerical value.

[Brief explanation of the drawing]

The drawing is a block diagram showing the configuration of a numerical counting device according to the present invention. 1... Reference frequency oscillation circuit, 2... Frequency divider circuit, 3... Phase comparison circuit, 4...
Low-pass filter circuit, 5... Voltage controlled oscillation circuit, 6
...Local oscillation circuit, 7...Frequency mixing circuit, 8...Programmable counter, 9,1
1, 14... Decoder, 10... Counter, 12, 15... Display, 13...
・Frequency counter, 16... Input terminal, 17.
...Output terminal.

Claims (1)

[Claims] 1. A first counter that counts a variable converted into a pulse number, a first display that adds the contents of the first counter via a first decoder and displays it, and a programmable counter whose contents are inputted via a second decoder, a reference frequency generation section having a reference frequency oscillation circuit, and a phase comparison circuit that compares phases of output signals of the reference frequency generation section and the programmable counter; a low-pass filter circuit whose output voltage level is controlled by the output signal of the phase comparison circuit; a voltage-controlled oscillator circuit whose oscillation frequency is controlled by the output of the low-pass filter circuit; and an output of the voltage-controlled oscillator circuit. a frequency mixing circuit that generates a difference frequency signal by subtracting the output signal frequency of the local oscillation circuit from the signal frequency, and causes the programmable counter to perform a subtraction operation using the difference frequency signal; and an output signal of the voltage controlled oscillation circuit. It comprises a frequency counter that counts frequencies, and a second display that displays the content of the frequency counter added via a third decoder, the second display that displays the content of the variable and the frequency counter. A numerical counting device characterized by displaying a frequency of the sum of the product of the output signal frequency of the reference frequency generating section and the output signal frequency of the local oscillation circuit.