JPH0581503A - Device for discriminating human body moving direction - Google Patents

Abstract

PURPOSE:To obtain a human body moving direction discriminating device by which a quick human body moving direction discrimination can be attained by preventing a malfunction. CONSTITUTION:A voice synthesizing circuit 20 is operated according to the detected output of a pyroelectric infrared ray sensor which previously and successively detects the human body among pyroelectric infrared ray sensors 1 and 2 respectively having two human body detecting areas. And also, when one of the pyroelectric infrared ray sensors 1 and 2 previously detects the human body only in one human detecting area, and then the other successively detects the human body, the detected output of the pyroelectric infrared ray sensor which successively detects the human body afterwards is invalidated by AND gates 9 and 10, so that the malfunction can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a human body moving direction discriminating apparatus for discriminating a human body moving direction by two human body detecting means each having a plurality of human body detecting ranges.

[0002]

2. Description of the Related Art For example, a device for determining a direction of movement of a human body in a visitor alarm installed in a doorway of a store and producing a voice such as "Thank you." Or "Welcome." The next 2 with such a configuration
There are different types.

The first one discriminates the direction when the two pyroelectric infrared sensors 23 and 24 output at a certain time difference, and the second one is the pyroelectric infrared sensor 23 and 24. The direction is discriminated at the moment when an output is generated from any one of 24.

[0004]

The above-mentioned first problem is 2
The direction cannot be discriminated unless both of the two pyroelectric infrared sensors detect the human body. Therefore, when a visitor is notified, the notification may be performed after a person passes by, which delays the notification.

In the second type, the output of the pyroelectric infrared sensors 23 and 24 becomes uncertain when the moving human body enters the overlapping range of the detection range of each sensor, and malfunctions. There is an inconvenience.

An object of the present invention is to eliminate malfunctions and
The purpose is to enable rapid determination of the moving direction of the human body.

[0007]

According to the present invention, when one of the two human body detecting means continuously detects a human body in a plurality of human body detecting ranges, which of the two human body detecting means detects a human body. The human body moving direction discriminating means for discriminating the moving direction of the human body and one of the two human body detecting means continuously detect the human body in a plurality of human body detecting ranges, and then,
When the other one continuously detects a human body in a plurality of human body detection ranges, priority is given to the detection of the human body detection means that first detected the human body,
After that, the detection control means that invalidates the detection of the human body detection means that has continuously detected the human body in a plurality of human body detection ranges, and one of the two human body detection means detects the human body first in only one human body detection range. After that, when the other one continuously detects a human body in a plurality of human body detection ranges, by providing a malfunction prevention unit that invalidates the detection output of the human body detection unit that detects a human body in a plurality of human body detection ranges later. It has achieved the above objectives.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to an embodiment shown in the drawings.

In FIG. 1, reference numerals 1 and 2 are pyroelectric infrared sensors constituting a human body detecting means for detecting whether or not a human body exists in a human body detection area. Fresnel lenses 3 and 4 are for dividing the human body detection areas of the pyroelectric infrared sensors 1 and 2 into A and B and C and D, respectively.
Amplifiers 5 and 6 amplify the output of the pyroelectric infrared sensor 1, and the amplifier 6 amplifies the output of the pyroelectric infrared sensor 2. 7 and 8 are comparators, which are amplifiers 5 and 6 respectively.
An output is produced when the output signal from outputs a predetermined level. Reference numerals 9 and 10 are AND gates that constitute malfunction prevention means, and reference numerals 11, 12, 13, and 14 are flip-flop circuits. 15 and 16 are timer circuits, and the timer circuit 15 is
The AND gate 9 outputs "1" to start timing, and when the set time Ta (the time required for a person to cross the human body detection areas C and D from the human body detection area B at a normal walking speed) elapses. Circuits 11 and 12
To reset. The timer circuit 16 includes an AND gate 10
Starts timing by outputting "1", and when a set time Tb (the time required for a person to cross the human body detection areas B and A from the human body detection area C at a normal walking speed) elapses, the flip-flop circuit 13 And 14 are reset. If the one of the pyroelectric infrared sensors 1 and 2 first detects the human body only in one human body detection area and the other continuously detects the human body, the set times Ta and Tb will be later. This is set so that the AND gates 9 and 10 invalidate the detection output obtained by continuously detecting the human body. 17
Is a flip-flop circuit that constitutes the human body movement direction determination means. 18 is an OR gate. Reference numeral 19 denotes a retriggerable one-shot pulse circuit which constitutes the detection control means, and outputs a one-shot pulse having a fixed time (a time required for a person to cross the entire human body detection area at a normal walking speed) at the rising input. Reference numeral 20 denotes a voice synthesis circuit, for example, when the output of the one-shot pulse circuit 19 becomes "1", the output of the flip-flop circuit 17 becomes "1".
Then, "Welcome.", And when the output of the flip-flop circuit 17 is "0", the voice "Thank you." Is synthesized. 21 is an amplifier, 22
Is a speaker.

First, the operation when the human body moves from L to R in FIG. 1 will be described with reference to the timing chart of FIG. a, b, c, d, e, f, g, h, i, j, k are output signals of a, b, c, d, e, f, g, h, i, j, k in FIG. Show. Now flip-flop circuits 11-14
It is assumed that and 17 have been reset.

When a human body is first detected in the human body detection area A, an output of a predetermined level or more is output from the pyroelectric infrared sensor 1, amplified by an amplifier 5, and supplied to a comparator 7, which outputs the output shown in FIG. Pulse P1 is generated.
This pulse P1 passes through the AND gate 9 as shown in FIG. 2b, and the rising edge thereof triggers the flip-flop circuit 11. Further, the timer circuit 15 also starts operating by this output.

Next, when a human body is detected in the human body detection area B, the pyroelectric infrared sensor 1 again outputs an output of a predetermined level or more, so that it is amplified by the amplifier 5, supplied to the comparator 7, and output from it. Produces the pulse P2 of FIG. 2a. This pulse P2 passes through the AND gate 9 as shown in FIG. 2b, the rising edge thereof triggers the flip-flop circuit 11, the output c thereof falls, and this falling edge triggers the flip-flop circuit 12 and its output d is "1". Becomes When d becomes "1", the flip-flop circuit 17 is triggered and its output k becomes "1". The output i of the OR gate 18 also rises, the one-shot pulse circuit 19 is triggered,
From the output, a one-shot pulse P3 having a constant time width shown in FIG. 2j is generated. At this time, the voice synthesizing circuit 20 inputs "1" from the flip-flop circuit 17, and the input "1" from the flip-flop circuit 17 is read by the rise of P3 to synthesize the voice "Welcome." , Amplifier 22 amplifies and speaker 22
To inform the voice.

Subsequently, when the pyroelectric infrared sensor 2 detects the human body in the human body detection area C due to the movement of the human body, the pyroelectric infrared sensor 2 outputs a predetermined level or more and is amplified by the amplifier 6. , Which is supplied to the comparator 8, from which the pulse P4 of FIG. 2e is generated. This pulse P4 passes through the AND gate 10 as shown in FIG. 2f, and the rising edge thereof triggers the flip-flop circuit 13. Further, the timer circuit 16 also starts operation by this output.

When a human body is detected in the human body detection area D, the pyroelectric infrared sensor 2 again outputs an output of a predetermined level or more, so that it is amplified by the amplifier 6 and supplied to the comparator 8, and the output is obtained. Pulse P5 of FIG. 2e
Occurs. This pulse P5 passes through the AND gate 10 as shown in FIG. 2f, the rising edge thereof triggers the flip-flop circuit 13, and the output g thereof falls,
This fall triggers the flip-flop circuit 14 and its output h becomes "1". Since the flip-flop circuit 17 is triggered when h becomes "1", the output k becomes "0". Also, the output i of the OR gate 18
Rises and the one-shot pulse circuit 19 is triggered. At this time, since the one-shot pulse circuit 19 outputs the one-shot pulse P3, the output j does not rise and the voice synthesis circuit 20 is not triggered and the voice synthesis circuit 20 is not output.

That is, when the human body moves from L to R in FIG. 1, the notification "Welcome."

The flip-flop circuits 11 and 12 are reset by the output of the timer circuit 15, and the flip-flop circuits 13 and 14 are reset by the output of the timer circuit 16 to return to the initial state.

Next, the case where the human body moves from R to L in FIG. 1 will be described with reference to the timing chart of FIG.
a, b, c, d, e, f, g, h, i, j, k are output signals of a, b, c, d, e, f, g, h, i, j, k in FIG. Show. Now, it is assumed that the flip-flop circuits 11 to 14 and 17 are reset.

When a human body is first detected in the human body detection area D, an output of a predetermined level or higher is output from the pyroelectric infrared sensor 2, amplified by the amplifier 6, and supplied to the comparator 8, which outputs the output shown in FIG. 3e. Pulse P6 is generated.
This pulse P6 passes through the AND gate 10 as shown in FIG.
Is triggered. Further, the timer circuit 16 also starts operation by this output.

Next, when a human body is detected in the human body detection area C, the pyroelectric infrared sensor 2 again outputs an output of a predetermined level or more, so that it is amplified by the amplifier 6, supplied to the comparator 8, and output from the output. Produces the pulse P7 of FIG. 3e. This pulse P7 passes through the AND gate 10 as shown in FIG. 3f, the rising edge thereof triggers the flip-flop circuit 13, its output g falls, and this falling edge triggers the flip-flop circuit 14 and its output h is "1". Becomes Since the flip-flop circuit 17 is triggered when h becomes "1", the output k becomes "0". The output i of the OR gate 18 rises, the one-shot pulse circuit 19 is triggered, and the one-shot pulse P8 having a constant time width shown in FIG. At this time, the voice synthesis circuit 20 inputs “0” from the flip-flop circuit 17,
By the rise of P8, the flip-flop circuit 1
The input “0” from 7 is read, the voice “Thank you.” Is synthesized, amplified by the amplifier 21, and the voice is notified from the speaker 22.

Subsequently, when the pyroelectric infrared sensor 1 detects the human body in the human body detection area B due to the movement of the human body, the pyroelectric infrared sensor 1 outputs a predetermined level or more and is amplified by the amplifier 5. , Which is supplied to the comparator 7, from which the pulse P9 of FIG. 3a is generated. This pulse P9 passes through the AND gate 9 as shown in FIG. 3b, and the rising edge thereof triggers the flip-flop circuit 11. Further, the timer circuit 15 also starts operating by this output.

When a human body is detected in the human body detection area A, the pyroelectric infrared sensor 1 again outputs an output of a predetermined level or more, so that it is amplified by the amplifier 5, supplied to the comparator 7, and output from the output. Pulse P1 of FIG. 3a
0 occurs. This pulse P10 is AN as shown in FIG. 3b.
The flip-flop circuit 11 is triggered by the rising edge of the D-gate 9 and its output c falls, and by this falling edge, the flip-flop circuit 12
Is triggered and its output d becomes "1". Since the flip-flop circuit 17 is triggered by d becoming "1", the output k becomes "1". Further, the output i of the OR gate 18 also rises and the one-shot pulse circuit 19 is triggered. At this time, the one-shot pulse circuit 19 outputs the one-shot pulse P8. Is not triggered and the voice synthesis circuit 20 does not output.

That is, when the human body moves from L to R in FIG. 1, the message "Thank you" is issued.

Finally, when a human body enters from the front of the detection area and obliquely passes, for example, in FIG. 1, the human body is first detected in the human body detection area B, and subsequently detected in the human body detection areas C and D. The operation at this time will be described with reference to the timing chart of FIG. a, b, c, c ', d,
e, f, g, h, i, j and k are a, b, c and c ′ in FIG.
, D, e, f, g, h, i, j, k output signals. Now, it is assumed that the flip-flop circuits 11 to 14 and 17 are reset.

When a human body is detected in the human body detection area B,
An output of a predetermined level or more is output from the pyroelectric infrared sensor 1, amplified by the amplifier 5, supplied to the comparator 7, and the pulse P11 of FIG. 4a is generated from this output. This pulse P11 passes through the AND gate 9 as shown in FIG. 4b, the rising edge thereof triggers the flip-flop circuit 11, and the output c ′ becomes “0”. Further, the timer circuit 15 also starts operating by this output. When the output c'becomes "0", the AND gate 10 is closed. Here, since the flip-flop circuit 11 is not reset during the set time Ta of the timer circuit 15 (the time required for a person to cross the human body detection areas C and D from the human body detection area B at a normal walking speed), the AND gate is provided during this period. 10 is closed. Therefore, even if the pyroelectric infrared sensor 2 detects a human body in the human body detection areas C and D and outputs an output above a predetermined level, this output cannot pass through the AND gate 10 and the output i of the OR gate 18 does not rise. , The one-shot pulse circuit 19 is not triggered, so the voice synthesis circuit 2
0 does not work and no voice notification is given.

On the contrary, in FIG. 1, when the human body is first detected in the human body detection area C and then in the human body detection areas B and A, the operation is the same as above.
Since the AND gate 9 is closed by 3, the output cannot pass through the AND gate 9 even if the pyroelectric infrared sensor 2 detects the human body in the human body detection areas B and A and outputs an output above a predetermined level. Since the output i of 18 does not rise and the one-shot pulse circuit 19 is not triggered, the voice synthesis circuit 20 does not operate and voice notification is not performed.

[0026]

As described above in detail, the human body moving direction discriminating apparatus of the present invention discriminates the moving direction when the human body is continuously detected in a plurality of human body detecting ranges in one human body detecting means. It is possible to quickly determine the moving direction of the human body. Therefore, for example, when it is used at a doorway or the like of a store that emits a voice corresponding to an entrance / exit, the voice can be emitted without delay. Further, when the human body is not continuously detected in the entire human body detection range by one human body detection means, the detection output is not generated because the movement direction cannot be determined, and thus the malfunction can be eliminated.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of an embodiment of the present invention.

FIG. 2 is a timing chart for explaining the operation of FIG.

FIG. 3 is a timing chart for explaining the operation of FIG.

FIG. 4 is a timing chart for explaining the operation of FIG.

FIG. 5 is a block circuit diagram of a conventional human body movement direction determination device.

[Explanation of symbols]

 1, 2 Human Body Detection Means 9, 10 Malfunction Prevention Means 17 Human Body Movement Direction Discrimination Means 19 Detection Control Means

Claims (1)

[Claims] 1. Two human body detection means each having a plurality of human body detection areas, and when one of the two human body detection means continuously detects a human body in a plurality of human body detection areas, the two human body detection means are provided. A human body movement direction determination means for determining the movement direction of the human body depending on which of the detection means detects the human body, and one of the two human body detection means, one of which continuously detects the human body in a plurality of human body detection ranges, Next, when the other one continuously detects a human body in a plurality of human body detection ranges, the human body detection unit that first detects the human body gives priority to detection, and then the human body continuously detects the human body in a plurality of human body detection ranges. Of the above two human body detection means, one of the two human body detection means first detects the human body, and then the other one continuously detects a plurality of human body detection areas. Human body detected In this case, the human body movement direction discriminating device is provided with: a malfunction preventing unit that invalidates the detection output of the human body detecting unit that detects the human body in a plurality of human body detecting ranges later.