JPS6236089Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an audio output type measuring device that can notify digital measurement information such as current, voltage, resistance value, etc. by audio output.

2. Description of the Related Art Measuring instruments that can digitally display measured values of current, voltage, resistance, etc. of an object to be measured have been proposed.

For example, regarding this type of measuring instrument, the applicant proposed a digital tester that can digitally display the measured values of an object to be measured in Utility Application No. 111750/1983.

Furthermore, in Utility Model Application No. 177106/1983, the applicant proposed electronic equipment, such as a digital clock and a digital tester, which can notify digital measurement information by audio output.

The purpose of this proposal is to provide an audio output type measuring instrument that is an improved version of such a measuring instrument.In particular, it is possible to selectively switch between a mode state in which measured digital information is outputted as a sound and a mode state in which no sound output is performed. The present invention is characterized in that it is provided with a selection switching means that allows selection switching means.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

Here, as an example, a case where the present invention is adopted in a digital tester will be explained.

FIG. 1 is an external view showing an example of a digital tester according to the present invention.

In the figure, 1 is the main body of the tester, which includes at least a speaker 2, a display section 3, a measurement mode changeover switch 4 for changing the mode to be measured such as voltage V, current A, resistance Ω, etc., a power switch 5, and a tester rod 8. A tester rod 8, which has a terminal 6 for connecting a lead wire 7 and is further connected to the main body 1, is equipped with a measuring switch 9 and a display 10 according to the present invention. A switch 9 is built into the test rod 8 so that it can be switched immediately according to the object to be measured, making it easy to use.

That is, the measurement switch 9 can be operated by selectively switching between a mode state in which digital information measured from the circuit inside the digital tester main body is outputted as a sound, and a mode state in which no sound output is performed. The display unit 10 is configured to switch the display based on the mode state. If the voice notification was made only while the switch 9 was pressed, the switch would have to be pressed all the time, which would be difficult to use, but with this arrangement, once the switch is pressed, it can be released.
In addition, when the power is turned on, the display body 10 provided on the tester rod 8 to display the mode state can determine the state by whether or not it is outputting sound, but when the power is turned off and the power is turned off, This is because it may be mistaken for a non-alert state. Also, if the interval between continuous vocalizations is, for example, once every 2 seconds, and the audio output time for the measured value is 1 second, no audio will be output for 1 second, and the status will not be known at that time.
This is because it is very easy to use if the mode is displayed in this way and is built into the tester stick. moreover,
The present tester is configured so that it outputs audio only after pressing the switch 9 in advance. In other words, when measuring resistance, etc., if the tester rod is not in contact with the object to be measured, the resistance will be high, and it would be inconvenient to output audio until then. Therefore, it is easier to use and consumes less power if the voice is emitted continuously after the switch is pressed.

In the above, the display section 3 is composed of a numerical value display section 3A and a unit (for example, volt V, ampere A, ohm Ω, etc.) display section 3B.

Of course, the tester rod 8 is detachable from the main body 1 via the lead wire 7, but it may be of a fixed type depending on the type of measuring instrument.

FIG. 2 is a block diagram showing the specific configuration of the digital tester of the present invention.

In FIG. 2, the same parts as in FIG. 1 are designated by the same reference numerals.

When the tester rods 8, 8' are brought into contact with the object to be measured (not shown), the tester measuring section 11
A configuration is adopted in which a measured value is measured and the measured value is outputted as a sound from the speaker 2 based on the voice synthesis circuit 13.

The digital measuring section 11 can be achieved using a known circuit as shown in FIG. 3, for example.

In other words, the sawtooth wave is generated by the sawtooth wave generation circuit PG.
P ₀ and the input V ₁ from the object under test and this
The comparator CJ compares the output P ₀ of the PG, and when the voltage levels match, for example, a match output P ₁ is generated.
DJ pulses at the start of PG sawtooth wave P ₀
The gate signal generation circuit SSC generates _a pulse P ₂
Generates a gate pulse _P3 that rises at pulse P1 and falls at pulse _P1 . Then, only while gate pulse P ₃ is being generated, count pulse P ₄ (output of count pulse generation circuit CG) is sent to the counting circuit via the gate circuit.
Add to CC. GC receives gate pulse P ₃ and inputs pulse P ₄ to CC during the period of P ₃ . That is, V ₁ = P ₀
When this happens, the counting result becomes a digital measurement value of the input value.

FIG. 4 shows a time chart of each of the above pulses.

In this case, the above-mentioned counting result is measured by a measurement counter 12 stored in binary code, and the time required to open and close the gate 16 by a periodic pulse (for example, a pulse generated once every 2 seconds) from a constant periodic pulse generation circuit 17 is determined. The buffer register 15 is configured to control the counter 12 and transfer the contents of the counter 12 to the buffer register 15.

Here, a circuit configuration for controlling whether or not to apply the output pulse of the circuit 17 that generates constant periodic pulses to the transfer gate 16 will be described.

First, when the switch 5 connected to the power source B is closed, the circuit 19 generates a transient pulse when the power is turned on.
generates a reset signal to reset the T-type flip-flop 18 and set it to its initial state. on the other hand,
This T-type flip-flop 18 is set by closing a switch 9A that opens and closes in conjunction with a measuring switch (knob) 9 provided on the tester 8. When this switch 9 is pressed again, it opens the switch 9A and resets the flip-flop 18. That is, each time the switch 9 is pressed, the T-shaped F/F 18 is reversed. When T-type flip-flop 18 is set, its set output opens gate 19;
The pulse generating circuit 17 applies pulses with a constant period to the transfer gate 16, so that the contents of the measurement counter 12 are transferred to the 4-digit buffer register 15 at regular intervals. On the other hand, flip-flop 18
The set output causes a lamp 10A or the like provided on the display 10 to be displayed via its drive circuit 10B to inform the operator that it is in the audio output mode. Reference numeral 4 denotes a rotary switch for changing the range, which has measurement terminals for volts V, amperes A, and ohms Ω, and by this switching, the digital measuring section 11 is set to various measurement states. In each measurement mode, the gate 21 generates, for example, code information C ₁ , C ₂ , C ₃ stored in the memory ROM, and predetermined information is decoded by the display decoder 23 and displayed on the unit display section 3B. For example, a C ₁ code will display volts V, a C ₂ code will display amperes A, and a C ₃ code will display ohms Ω.

On the other hand, the measurement counter 12 of the digital measurement section 11
The binary code information is decoded by the display decoder 22 and displayed on the numerical display section 3A.

Reference numeral 14 denotes a sequential control circuit which generates sequential pulses t ₁ to t _o , and every time this pulse is generated, the contents of the buffer register 15 are taken into the speech synthesis circuit 13 via the word selection circuit 20 . _S1 is an input terminal that takes in this input data. The selection circuit 20 selects the information to sequentially transfer the contents of the buffer register 15 to the speech synthesis circuit 13, and is composed of, for example, a group of gate circuits, and also incorporates the code information of C ₁ , C ₂ , and C ₃ to select the information to be sequentially transferred to the speech synthesis circuit 13. Volts, amperes,
Outputs audio such as ohm.

S ₀ is a terminal for inputting an input data capture timing signal, and S ₂ is an audio output end signal. Sequential pulses are sequentially output according to this signal S ₂ .

The sequential control circuit 14 receives the output pulse taken out from the pulse generation circuit 17 via the gate 19, first generates a _t1 pulse, and for example, uses this pulse to control the buffer register 15.
The most significant data is transferred to the voice synthesis circuit 13 and output as voice. And that audio output end signal
receive S ₂ , then generate a t ₂ pulse, then the second
The digit data is transferred to the voice synthesis circuit 13 and outputted as voice. In this way, all digits are output as audio.

The last to _pulse generates units.

The above operation is repeated every time a periodic pulse (output 17) arrives.

The above-mentioned speech synthesis circuit is configured as follows.

In the figure, read-only memory ROM
Audio quantization data is stored in VR. P ₁ , P ₂ . . . indicate each region of the spoken word.

It is assumed that the address counter VAC of VR is reset by the reset circuit CLA when no audio is output. When the address counter VAC is in the reset state, no address in the memory VR is designated, and therefore no audio is substantially output.

When you want to output audio, select the corresponding audio area P.
Set the initial address to VAC. For example, assuming that the desired word is in the _P2 area, the initial address of _P2 is set in VAC. Then, the initial address data will be
Output from VR ₀ .

Note that FA is an adder circuit that increases the address of VAC by 1 step, and performs VAC+1→VAC.
When VAC is in the reset state, this FA does not operate and the contents of VAC do not change. In other words, it remains reset.

However, when the initial address arrived≠
When the state is "0", the above VAC+1→VAC is automatically performed at a constant sampling frequency.

Therefore, once the initial address is set to VAC, the address will be automatically incremented one step at a time. Therefore, the quantized data of the P ₂ area is sequentially output as the output of VR ₀ .

The output of this VR ₀ is subjected to D-A conversion using a DAC, and then a low frequency component is passed through a filter LPF. This is because if the analog output when quantized data is D-A converted is step-like, if you output it as is through a speaker, it may be difficult to hear because it contains high-frequency components and noise-like audio is mixed in.
It is desirable to filter with LPF.

In this way, the output of the LPF is transferred to the speaker drive circuit DD.
Audio is output from the speaker SP via the .

The data structure of each area of VR is formed by adding an END (end) code to the last step of the audio quantized data. Therefore, when the audio output of the desired word is completed, the END code is output from VR ₀ .

JE detects this and activates CLA to reset VAC. As a result, no address in VR is specified, and the series of audio outputs stops. This state will be maintained until a new initial address is set in the VAC.

CC sets the initial address of the audio area that you want to output in the code conversion circuit to VAC.
This is a conversion circuit for determining a desired initial address based on the audio area designation signal _S1 .

S ₂ is the output of JE. When multiple words occur continuously, the output of JE determines which word corresponds to the next word.
Give S ₁ signal.

The code converter receives the audio area designation signal _S1
This is for determining the VR address,
It is also possible to incorporate a gate circuit inside and transmit the code-converted version of the specified signal _S1 to the VAC only when the trigger signal _S0 arrives.

As described above, according to the audio tester of the present invention, the tester bar is equipped with a switch for switching between the audio output mode and the mode that does not output audio, and a display that displays the mode status, so simply press the switch. It is much easier to operate than those that give voice notifications only when you are in the room, and since there is a mode changeover switch at hand, you can easily operate it when necessary.

Also, since there is a mode display at hand, it is possible to correct mistakes during measurement, such as when the tester says that it is in a mode that does not output audio even though the power is turned off.

[Brief explanation of the drawing]

Fig. 1 is an external view showing an example of the audio output type measuring device according to the present invention, Fig. 2 is a block diagram showing the specific configuration of the same measuring device, and Fig. 3 is a circuit block diagram showing the digital measuring section of the same block diagram. , Figure 4 is a time chart showing the pulse waveform of each part in Figure 3, Figure 5
The figure is the speech synthesis circuit configuration diagram in Figure 3, Figure 6 is a time chart of sequential pulses, and Figure 7 is a diagram of the speech synthesis circuit in Figure 3.
The figure shows an example of audio data stored in the ROM in Figure 5. In the figure, 1: main body, 2: speaker, 3: display section,
4: Measurement mode switch, 5: Power switch, 8: Tester rod, 9: Measurement switch, 10:
Display body, 11: Digital measurement section, 12: Measurement counter, 13: Speech synthesis circuit, 14: Sequential control circuit, 15: Buffer register, 16, 20, 21: Gate, 17: Constant period pulse generation circuit, 18 :T-type flip-flop,
19: transient pulse generation circuit, 22, 23: display decoder.

Claims (1)

[Scope of Claim for Utility Model Registration] An audio tester equipped with an audio output notification means for notifying digital measurement information by audio output, the mode state and audio for outputting the measured digital information to the tester stick of the audio tester. An audio tester characterized by being provided with a switch for switching a mode state in which no output is made, and a display body for displaying the mode state.