JP2008117206A - Receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pedestrian-supporting system for a visually handicapped person that enables a visually handicapped person to grasp a direction of an LED signal light device for a pedestrian when he/she crosses a crosswalk. <P>SOLUTION: A receiver 1 includes a light receiving element 11 for receiving a visible light signal from the LED signal light device 100 for pedestrians to output an electrical signal. The receiver 1 transmits signal information of "crossing prohibition" or "crossing permission" to a pedestrian in main voice based on the output signal of the light receiving element 11, additionally, according to an intensity of the output signal by the light receiving element 11, transmits information regarding a receiving status of the receiver 1 (a direction of the receiver 1) to a pedestrian in sub voice. In this way, in the case where the direction of the receiver 1 is deviated from the LED signal light device 100 for pedestrians, transmitting the receiving status to a visually handicapped person enables him/her to grasp the status, so that he/she can safely cross a crosswalk without deviating from the crosswalk to any great extent. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a receiver used in a pedestrian support system that supports crossing of a pedestrian such as a visually impaired person.

  First, as a pedestrian signal lamp, conventionally, there is an incandescent bulb (light source), a reflector arranged on the back side of the incandescent bulb, and a front cover arranged on the front side of the incandescent bulb. A signal lamp in which a white doll part (doll pattern) is formed on a (red or blue translucent cover) is generally used. Such a bulb-type pedestrian signal lamp is a full-light-emitting type, with “No crossing” a white pattern on a red background and “White crossing” a white pattern on a blue background. The light emission by (white) is such that the surroundings emit light in red or blue.

  In recent years, LED-type pedestrian signal lamps have been developed for the purpose of reducing power consumption, reducing labor required for maintenance and management, and solving the problem of false lighting due to the West. It has been put into practical use.

  As an LED-type pedestrian signal lamp, for example, a plurality of red LEDs and blue LEDs are used as light sources, and these LED groups are accommodated in a lamp case, and a pedestrian is disposed on a front cover disposed on the front side of the LED groups. There is a signal lamp that has a structure in which a translucent part (doll part) and a light-shielding part of a figure (doll) shaped in shape are provided, and the doll part only emits red or blue light (for example, see Patent Document 1) .

  In order to support the crossing of visually handicapped persons at intersections with pedestrian crossings, a guidance sound is emitted from a speaker placed in the vicinity of the pedestrian signal lamp when crossing is possible (when the signal is blue). A signal device with an audio device is installed (see, for example, Patent Document 2). In such a pedestrian traffic light with an audio device, the direction of the pedestrian crossing is informed to visually impaired persons by means of a guidance sound. For example, different bird calls are made according to the crossing direction, such as “cuckoo” for the green signal in the east-west direction and “piyopiyo” for the green signal in the north-south direction at the intersection. However, in pedestrian traffic lights with sound equipment, there are some intersections that do not emit a guide sound at night (for example, after 8 pm) in consideration of nearby residents, ensuring the safety of crossing at night for visually impaired people. Is difficult.

  In consideration of such points, pedestrian signal information is transmitted by infrared communication from a projector disposed in the vicinity of the pedestrian signal lamp, and the transmission signal is transmitted to a visually impaired person's receiver (for example, a portable terminal device). There is an infrared communication type pedestrian signal lamp that notifies a visually handicapped person that crossing is possible (or impossible to cross) by receiving and converting it into sound (for example, see Patent Document 3). Recently, a pedestrian support system using low energy and safe visible light has attracted attention.

In the visible light communication type pedestrian support system, utilizing the point that the LED can blink at high speed, the LED type pedestrian signal lamp is provided with a modulation unit that modulates an audio signal (such as FM modulation) and an LED drive unit. A lighting control circuit is provided, and a blue LED (or red LED) of a signal lamp is rapidly blinked at a predetermined frequency (for example, about 200 kHz) based on the modulation signal modulated by the modulation unit, and a visible light signal (pulsed signal) ) Is output. In the receiver on the pedestrian (visually impaired) side, the visible light signal from the LED type pedestrian signal lamp is received by the light receiving element and converted into an electric signal, and the electric signal is demodulated by the demodulator (FM demodulation, etc.) In this system, a voice signal is output from an earphone, a headphone, or a speaker, thereby informing a pedestrian (visually impaired person) that the vehicle can cross (or cannot cross).
JP 2001-081738 A JP 2000-123281 A JP 2002-150475 A

  By the way, in the visible light communication type pedestrian support system, when a visually impaired person crosses the pedestrian crossing and becomes unable to hear the voice indicating “crossing is possible”, it is safe to move off the pedestrian crossing. The above problem is a concern. In addition, when the sound indicating “crossing is possible” cannot be heard, the direction of the LED pedestrian signal lamp may be lost. In addition, when the voice indicating “crossing is possible” is no longer heard, whether the voice is out of the reception area, the voice is not heard due to the failure of the receiver, or the voice cannot be heard due to other factors. Because it cannot be judged, visually impaired people may feel anxious.

  The present invention has been made in consideration of such circumstances, and in a pedestrian support system for visually impaired persons, when the visually impaired person crosses a pedestrian crossing, the direction of the LED pedestrian signal lamp is changed. It is an object of the present invention to provide a receiver that can be grasped and can improve the safety of a visually handicapped person across an intersection.

  The present invention includes a red light-emitting unit that includes a red LED and displays “uncrossable” and a blue light-emitting unit that includes a blue LED and displays “crossable”. In a visible light communication type pedestrian support system using an LED type pedestrian signal lamp that blinks an LED and a blue LED of the blue light emitting unit at a predetermined frequency and outputs a visible light signal, a pedestrian (a visually impaired person) A receiver that receives a visible light signal output by the LED pedestrian signal lamp, and that receives a visible light signal from the LED pedestrian signal lamp and outputs an electrical signal; , Main transmission means for transmitting signal information of “impossible to cross” and “possible to cross” to the pedestrian based on the output signal of the light receiving element, and the reception status of the receiver based on the intensity of the output signal of the light receiving element Walking information about It is characterized in that an auxiliary transmission means for transmitting to.

  According to the present invention, when the intensity of the output signal of the light receiving element is low, information indicating that the direction (orientation) of the receiver is deviated from the LED pedestrian signal lamp is transmitted to the pedestrian (the visually impaired). Can do. As a result, when the visually handicapped person is crossing the pedestrian crossing, the direction of the LED pedestrian signal lamp can be grasped, and it can be safely crossed without significantly departing from the pedestrian crossing.

  As a specific configuration of the present invention, “crossing impossible” and “crossing possible” signal information is output as the main voice, and information regarding the reception status of the receiver is output as auxiliary voice different from the main voice. A configuration can be mentioned. In this case, the auxiliary voice indicating the reception status may be superimposed and output on the main voice indicating “crossing is impossible” and “crossing is possible”.

  In the present invention, the intensity of the output signal of the light receiving element is compared with a plurality of determination levels in which the level height is changed stepwise, and the reception status of the receiver is based on the comparison result with each determination level. Information may be transmitted to a pedestrian (a visually impaired person).

  In the present invention, the maximum value of the output signal of the light receiving element is sampled, the maximum value is set as the highest determination level, and a plurality of determination levels are set by changing the level height stepwise. You may make it compare with a level. Thus, if the determination level is made variable, even if the receiver is away from the LED pedestrian signal lamp (for example, when the level of the visible light signal reaching the light receiving element is low), the determination is made. Since it is possible to automatically adjust the level, it is possible to appropriately grasp the reception situation (reception direction deviation of the receiver).

  According to the present invention, information on the reception status of the receiver is transmitted to the pedestrian (visually impaired person) based on the intensity of the output signal of the light receiving element, so that the visually impaired person crosses the pedestrian crossing. When the direction of the receiver is deviated from the LED type pedestrian signal lamp, the situation can be grasped. Thereby, when a visually handicapped person crosses a pedestrian crossing, it can cross safely without leaving | separating significantly from a pedestrian crossing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, an example of an LED type pedestrian signal lamp used in a visible light communication type pedestrian support system will be described with reference to FIGS.

-LED pedestrian signal lamp-
The LED-type pedestrian signal lamp 100 in this example is a signal lamp used in a pedestrian support system that supports a pedestrian (visually impaired person) crossing an intersection by visible light communication, and displays a red color indicating “non-crossing”. A light emitting unit 100A and a blue light emitting unit 100B displaying “crossing is possible” are arranged above and below. On the front side of the LED-type pedestrian signal lamp 100, ridges 104, 104 are arranged to cover the upper region on the front side of the red light emitting unit 100A and the blue light emitting unit 100B.

  The red light emitting unit 100A and the blue light emitting unit 100B are accommodated in the lamp case 102, and the front covers 113 of the light emitting units 100A and 100B face the front side of the lamp through the openings 103A and 103B of the front door 103, respectively. . It should be noted that the red light emitting unit 100A displaying “non-crossable” and the blue light emitting unit 100B displaying “crossable” are the same except for the doll pattern of the doll translucent plate 140 and the LED emission color described later. Therefore, only the configuration of the blue light emitting unit 100B will be described.

  As shown in FIG. 4, the blue light emitting unit 100B includes an LED substrate 110 on which a large number of blue LEDs 101B... 101B are mounted, a front cover 113, a doll translucent plate 140, a presser cover plate 115, a unit case 120, and the like. I have. The unit case 120 is a resin molded product (for example, made of ABS resin), and the LED substrate 110 is accommodated inside the case.

  The front cover 113 is a molded product of transparent resin (for example, polycarbonate resin). The doll translucent plate 140 is a member in which a transparent resin plate (for example, a methacrylic resin plate) is provided with a light shielding film. The doll translucent plate 141 includes a translucent portion 141 of the doll pattern and a light shielding portion 142 that shields portions other than the translucent portion 141. Is provided. The doll translucent plate 140 and the presser cover plate 115 are arranged between the front end surface of the unit case 120 and the front cover 113 in a state of being overlapped with each other. In this state, the front cover 113 is fixed to the unit case 120 with screws. By doing so, it is held between the unit case 120 and the front cover 113.

  As shown in FIG. 3, the blue light emitting unit 100 </ b> B having the above structure has a front door in a state where the front cover 113 is fitted in the opening 103 </ b> B of the front door 103 and the front door 103 of the LED pedestrian signal lamp 100. It is fixed to 103 by fastening with a screw (or presser fitting). A waterproof packing 116 (FIG. 4) is disposed on the flange portion 113 </ b> A of the front cover 113 (the portion that contacts the front door 103). Similarly, the red light emitting unit 100A is attached to the front door 103.

  In the LED type pedestrian signal lamp 100 of this example, when the blue LEDs 101B... 101B of the LED substrate 110 are turned on, the LED light from these blue LEDs 101B. The LED light transmitted through the light transmitting portion 141 of the light transmitting plate 140 is emitted forward through the front cover 113. Thereby, only the translucent part 141 of the doll translucent plate 140, that is, the doll pattern C2, is lit and displayed in blue.

  In the blue light emitting unit 100B shown in FIG. 4, the doll symbol C2 of the doll translucent plate 140 is set to “crossable”, but in the case of the red light emitting unit 100A, the doll symbol C1 shown in FIG. In the case of the red light emitting unit 100A, a large number of red LEDs 101A... 101A (see FIG. 6) are used as light sources.

  And the LED type pedestrian signal lamp 100 of the above structure is supported via the support arms 302 and 302 by the traffic light pole 301 installed in the intersection with a pedestrian crossing, as shown in FIG.

  Next, the lighting control circuit 200 of the LED type pedestrian signal lamp device 100 of this example will be described with reference to FIG.

  First, as shown in FIG. 6, the lighting control circuit 200 of the LED pedestrian signal lamp device 100 includes a control unit 201, an audio signal generation unit 202, a modulation unit 203, an LED driving unit 204, and a power supply voltage for driving the LED. Is provided to the control unit 201. The audio signal generation unit 202 generates an audio signal indicating that the LED-type pedestrian signal lamp 100 is a red signal (cannot cross) and a sound signal indicating that it is a blue signal (can cross). The modulation unit 203 performs FM modulation on the audio signal from the audio signal generation unit 202. As an example of the voice indicating “non-crossing”, a voice “signal is red” can be given. In addition, examples of the voice indicating “crossing is possible” include voices of “cuckoo” or “piyopiyo”.

  In the lighting control circuit 200 having the above circuit configuration, either the red light emitting unit 100A or the blue light emitting unit 100B blinks at high speed by FM modulation in accordance with the signal lighting signal (AC100V) transmitted from the signal controller 210. . Specifically, in the red signal display period, the audio signal generation unit 202 emits an audio signal indicating that it is a red signal (cannot be traversed) in response to an instruction from the control unit 201, and the audio signal is sent to the modulation unit 203. FM modulation. Based on the modulation signal modulated by the modulation unit 203, the LED driving unit 204 is pulsed by rapidly blinking the red LEDs 101A,... 101A of the red light emitting unit 100A at a predetermined frequency (for example, about 200 kHz). Output a signal. On the other hand, in the display period of the green signal, the audio signal generation unit 202 emits an audio signal indicating that it is a blue signal (crossing is possible) according to an instruction from the control unit 201, and the modulation unit 203 performs FM modulation on the audio signal. Based on the modulation signal modulated by the modulation unit 203, the LED driving unit 204 pulses the blue LEDs 101B,... 101B of the blue light emitting unit 100B at a predetermined frequency (for example, about 200 kHz) to make a pulsed visible light signal. Is output.

  In addition, if each LED 101A and 101B blinks at high speed (about 200 kHz) as in this example, the blinking of the LED is not perceived by the human eye, which affects the transmission of visual crossing information to a healthy pedestrian. In this way, visible light communication with the receiver 1 carried by a visually impaired person can be performed.

-Receiver-
Next, an example of the receiver of the present invention will be described with reference to the block diagram of FIG. The receiver 1 of this example is a receiver that carries a visible light signal that is carried by a pedestrian (a visually handicapped person) and that is output from the LED pedestrian signal lamp 100 described above, in a visible light communication type pedestrian support system. It is.

  The receiver 1 in this example includes a light receiving element (for example, a photodiode) 11, an AC coupling unit 12, a preamplifier 13, a BPF (bandpass filter) 14, an FM demodulating unit 15, an RMS-DC converter circuit 16, a comparator 17, and auxiliary audio. The generator 18, the voice synthesizer 19, the audio amplifier 20, the audio jack 21, and the power supply unit 22 are provided. The light receiving element 11, the AC coupling unit 12, and the preamplifier 13 are mounted on the light receiving substrate 24. The BPF 14, the RMS-DC converter circuit 16, the FM demodulator 15, the comparator 17, the auxiliary voice generator 18, the voice synthesizer 19, the audio amplifier 20, the audio jack 21 and the power supply 22 are mounted on the amplification / demodulation board 25. ing. Note that power is supplied to each unit of the receiver 1 from a battery 23 built in the receiver 1.

  In the receiver 1 of this example, a visible light signal from the LED pedestrian signal lamp 100 is received by the light receiving element 11 and converted into an electric signal (voltage signal). The output signal of the light receiving element 11 is amplified by the preamplifier 13 after the low frequency component is cut by the AC coupling unit 12. The low-frequency component is cut by the AC coupling unit 12 in order to prevent the influence of sunlight. The output of the preamplifier 13 is input to the BPF 14, and a signal having a predetermined frequency (for example, about 200 kHz) component is extracted. The voltage signal that has passed through the BPF 14 is guided to the FM demodulator 15 and the RMS-DC converter circuit 16.

  The FM demodulator 15 performs FM demodulation on the input voltage signal, converts the input voltage signal into a voice signal (main voice signal), and outputs the voice signal to the voice synthesizer 19.

  On the other hand, the RMS-DC converter circuit 16 calculates the effective value of the voltage signal that has passed through the BPF 14 and outputs it to the comparator 17.

  The comparator 17 is set with two stages of determination levels L1 and L2 (L1> L2) having different levels with respect to the signal S after the effective value calculation, and each of the determination levels L1 and L2 and the signal S And a signal indicating the comparison result is output. Specifically, when the level of the signal S is [signal S ≧ L1], the command signal High is output to the auxiliary sound generator 18, and when the level of the signal S is [L1> signal S> L2], the command signal is output. Smid is output to the auxiliary sound generator 18. In addition, when the level of the signal S is [signal S ≦ L2], the command signal Slow is output to the auxiliary sound generator 18.

  Here, the determination levels L1 and L2 of the comparator 17 will be described. First, as shown in FIG. 7, if the distance of the reception position (distance in the direction of travel of the pedestrian crossing) with respect to the LED type pedestrian signal lamp 100 is “D”, the signal S output from the receiver 1 and after the effective value calculation is performed. The relationship between the voltage (effective value) and the distance D is as shown in FIG. When the distance in the width direction of the pedestrian crossing centering on the LED pedestrian signal lamp 100 is “W” and “−W”, the voltage (effective value) of the signal S and the distances W and −W are shown in FIG. The relationship is as shown in (b). Considering the relationship between the signal S and the distance, determination levels L1 and L2 as shown in FIGS. 8A and 8B are set in the comparator 17 in this example.

  Next, the auxiliary sound generation unit 18 is a functional unit that generates a sound signal that generates an intermittent sound of “pea”. When the output signal of the comparator 17 is “High”, the interval of the intermittent sound is shortened. An auxiliary audio signal that generates a high-level sound “beep-pip-beep” is output to the sound synthesizer 19, and when the output signal of the comparator 17 is “Slow”, a low-level sound with a longer interval between intermittent sounds The auxiliary speech signal for generating “Peep-Peep” is output to the speech synthesizer 19. Further, when the output signal of the comparator 17 is “Smid”, the auxiliary sound generating unit 18 is an intermediate level sound between the intermittent sound when the signal is High and the intermittent sound when the signal is Low. The auxiliary voice signal generating “P” is output to the voice synthesizer 19.

  The voice synthesizer 19 synthesizes the auxiliary voice signal from the auxiliary voice generator 18 with the main voice signal output from the FM demodulator 15. The synthesized audio signal is amplified by an audio amplifier and then guided to the audio jack 21. A pin jack of an earphone (or headphone) is connected to the audio jack 21, and a pedestrian (a visually impaired person) passes through the earphone through a main sound indicating “cannot cross” (for example, “signal is red”), and “ A synthesized voice obtained by superimposing an auxiliary voice (for example, “pip pip”) on a main voice (for example, “cuckoo” or “piyopiyo”) indicating “crossing is possible” can be heard.

  Examples of the receiver 1 include a belt type and a hat type receiver in which the receiver 1 is attached to a pedestrian using a belt or a hat. Further, instead of the audio jack 21, a speaker may be connected to output the main voice / auxiliary voice.

  In the visible light communication type pedestrian support system constituted by the receiver 1 and the LED type pedestrian signal lamp 100, the red LEDs 101A of the red light emitting unit 100A of the LED type pedestrian signal lamp 100 are rapidly flashed. When the output visible light signal is received by the receiver 1 on the visually handicapped person side, the sound indicating “cannot cross” (for example, “signal is red”) is output from the earphone via the audio jack 21 to the visually handicapped person. Communicated. Therefore, visually impaired persons can recognize that the intersection cannot be crossed by the sound output from the earphone. When the visible light signal output by the blue LED 101B,... 101B of the blue light emitting unit 100B blinking at high speed is received by the receiver 1 on the visually handicapped person side, the sound indicating “crossing is possible” (for example, “cuckoo”) is audio. The sound is output from the earphone via the jack 21 and transmitted to the visually impaired. Therefore, visually impaired persons can recognize that the intersection can be crossed by the sound output from the earphone.

  Further, the visible light signal output by the high-speed blinking of the blue LEDs 101B... 101B of the blue light emitting unit 100B of the LED pedestrian signal lamp 100 (or the fast blinking of the red LEDs 101A... 101A of the red light emitting unit 100A) is visually impaired. When the signal is received by the receiver 1 on the side, the received intensity of the visible light signal, that is, the voltage level of the signal S after the effective value calculation is compared with the signal output from the light receiving element 11, and the comparator 17 compares the level. , “Beep-Pip-Pi”, “P-P-P-Pi”, or “P-P-P-P” auxiliary sound is superimposed on the main sound (for example, “Cuckoo”) and output from the earphone.

  Specifically, when a visually handicapped person is crossing a pedestrian crossing and the direction (orientation) of the receiver 1 is directed to the LED pedestrian signal lamp 100, the reception intensity (the level of the received signal) is high. Therefore, a high-level auxiliary sound “beep-beep” is output from the earphone.

  On the other hand, when the direction (orientation) of the receiver 1 is slightly deviated from the LED pedestrian signal lamp 100, the reception intensity (the level of the received signal) is lowered, so that the intermediate level auxiliary sound “PPP ”Is output from the earphone, and when the direction (orientation) of the receiver 1 is greatly deviated, the reception intensity (the level of the received signal) is further reduced, so the low-level auxiliary sound“ P-P-P ” Is output from the earphone.

  As described above, when the visually impaired person is crossing the pedestrian crossing by changing the auxiliary sound according to the deviation of the direction (orientation) of the receiver 1 with respect to the LED-type pedestrian signal lamp 100, the receiver 1 When the direction (direction) is deviated, the situation can be easily grasped.

  Thus, for example, if the auxiliary sound is an intermediate-level sound “Peep-Peep”, the visually impaired person listens to the auxiliary sound while the auxiliary sound is “Peep-Peep” from the high-level sound “Peep-Peep”. By shifting the receiver 1 to the left or right until it changes to “Beep-Pip”, the direction shift of the receiver 1 with respect to the LED-type pedestrian signal lamp 100 can be corrected, so that a visually handicapped person crosses a pedestrian crossing. In addition, it is possible to cross safely without leaving the pedestrian crossing. Similarly, when the auxiliary sound is a low-level sound “Pee-Pee-Pe”, the auxiliary sound is similarly changed to “Low-level sound“ P-Pee-Pee ”” → [Intermediate-level sound “Peep-Pee”. Correcting the direction shift of the receiver 1 by performing an operation of adjusting the left and right orientation of the receiver 1 so that it becomes “Peep”] → [High-level voice “Pip Pip”] Therefore, when a visually handicapped person crosses a pedestrian crossing, the person can safely cross without crossing the pedestrian crossing.

  Even when a visually handicapped person is crossing a pedestrian crossing, the direction of the receiver 1 can be changed even if the direction of the LED pedestrian signal lamp 100 is lost due to the inability to hear the sound indicating “crossing is possible”. It is possible to find the direction of the LED pedestrian signal lamp device 100 by performing the operation of moving left and right until the auxiliary sound is heard.

  In the above example, since the synthesized voice is output by superimposing the auxiliary voice (for example, “Pip Pip”) on the main voice indicating “No crossing” (for example, “Signal is red”), When a person with a disability is waiting for a signal, it becomes possible to grasp the direction (orientation) deviation of the receiver 1 based on the interval of the auxiliary sound, that is, the intermittent sound of “pea”. On the other hand, when the direction of the receiver 1 is deviated, the direction of the LED pedestrian signal lamp device 100 can be specified by shaking the receiver 1 left and right while listening to the auxiliary sound.

-Other embodiments-
In the above example, an intermittent sound of “pea” is output as the auxiliary sound. However, the present invention is not limited to this, and when the output signal level of the light receiving element 11 (the voltage level of the signal S) is high, for example, “ If the signal level is low, for example, an auxiliary sound “Please adjust the direction of the receiver” may be output. Further, the tone of the auxiliary sound may be changed according to the output signal level of the light receiving element 11 (the voltage level of the signal S).

  In the above example, the determination level set in the comparator 17 is a fixed value. However, the determination level may be changed according to the output signal level of the light receiving element 11 (the voltage level of the signal S). Specifically, the peak hold circuit peaks the maximum value (voltage value) of the output signal S of the RMS-DC converter circuit 16, and uses the maximum value as the highest determination level to change the level height stepwise. The determination level may be made variable by setting it in the comparator 17. In this way, the determination level set for the output signal of the light receiving element 11 (the signal S after the effective value calculation) is made variable. Even when the receiver 1 is away from the LED pedestrian signal lamp 100 (for example, when the level of the visible light signal reaching the light receiving element 11 is low), the determination level is automatically adjusted. Therefore, it is possible to appropriately grasp the reception status (the direction shift of the receiver 1) When the determination level is variable, the receiver 1 is used for the first time. Then, it is necessary to perform a process of shaking the receiver 1 in the left-right direction to give a large amount of sensitivity information (reception level of visible light signal) to the receiver 1 and holding the maximum value of sensitivity. If the signal cannot be received for a predetermined time (for example, 10 seconds), a process of clearing the peak hold value and setting the default value of the determination level in the comparator 17 is executed.

  In the above example, the two determination levels L1 and L2 are set for the output signal of the light receiving element 11 (the signal S after the effective value calculation). However, the present invention is not limited to this. The determination level may be set.

  In the above example, the auxiliary sound is changed stepwise according to the intensity of the output signal level of the light receiving element 11, but the present invention is not limited to this, and the period of the intermittent sound “pi” and the sound tone are output. You may make it change linearly according to the intensity | strength of a signal level.

  In addition to the configuration of the above example, an acceleration sensor may be provided inside the receiver 1, and information based on the sensor output of the acceleration sensor may be output in addition to the auxiliary voice. In this case, for example, it is determined whether the output signal level of the light receiving element 11 (voltage level of the signal S) increases or decreases when the receiver 1 is swung left and right, and the receiver is based on the output of the acceleration sensor. It may be determined whether 1 is swung leftward or rightward, and information regarding the direction (orientation) of the receiver 1 may be added to the auxiliary sound and output. Specifically, when the receiver 1 is shaken in the right direction (or left direction) and the voltage level of the signal S decreases from the present time, a sound indicating that the receiver 1 is moved in the left direction (or right direction). Is added to the auxiliary sound and output. Further, when the receiver 1 is shaken leftward (or rightward) and the voltage level of the signal S rises from the present time, a sound for moving the receiver 1 leftward (or rightward) is used as auxiliary sound. Output in addition to. By performing such processing, a visually impaired person can easily grasp the direction (orientation) of deviation of the receiver 1.

  In the above example, the information regarding the reception status of receiver 1 (direction deviation of receiver 1) is transmitted to the pedestrian with an auxiliary voice. However, the present invention is not limited to this, and the pedestrian is caused by vibration using a vibrator or the like. You may make it transmit to.

  As a device for receiving a visible light signal from the LED-type pedestrian signal lamp 100, a line sensor in which photodiodes are arranged in a row, or a surface sensor in which photodiodes are two-dimensionally arranged, The direction of the LED type pedestrian signal lamp 100 can be specified from the sensor output.

It is a block diagram which shows an example of the circuit structure of the receiver of this invention. It is a front view which shows an example of the LED type pedestrian signal lamp used for a pedestrian assistance system. It is a longitudinal cross-sectional view of the LED type pedestrian signal lamp of FIG. It is a disassembled perspective view of the blue light emission part of the LED type pedestrian signal lamp of FIG. It is a figure which shows the installation state of the LED type pedestrian signal lamp device of FIG. It is a block diagram which shows an example of the circuit structure of the lighting control circuit of the LED type pedestrian signal lamp device of FIG. It is a figure which shows the distance D of the receiving position with respect to LED type pedestrian signal lamp, and the distances W and -W of the width direction of the crosswalk centering on LED type pedestrian signal lamp. It is a figure which shows the determination level set to the comparator of the receiver of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Receiver 11 Light receiving element 12 AC coupling part 13 Preamplifier 14 BPF
DESCRIPTION OF SYMBOLS 15 FM demodulation part 16 RMS-DC converter circuit 17 Comparator 18 Auxiliary sound generation part 19 Speech synthesis part 20 Audio amplifier 21 Audio jack 22 Power supply part 23 Battery 25 Amplification / demodulation board 100 LED type pedestrian signal lamp 100A Red light emission part ("" No crossing ”)
101A Red LED
100B Blue light-emitting part ("crossable")
101B Blue LED
200 lighting control circuit 210 signal controller

Claims (5)

A red light emitting unit that includes a red light source and displays “uncrossable” and a blue light emitting unit that includes a blue LED and displays “crossable”, the red LED of the red light emitting unit and the blue light emitting unit In a visible light communication type pedestrian support system using an LED type pedestrian signal lamp that blinks a blue LED of a light emitting unit at a predetermined frequency and outputs a visible light signal, the pedestrian carries the LED type pedestrian. A receiver for receiving a visible light signal output from a signal lamp,
A light receiving element that receives a visible light signal from the LED-type pedestrian signal lamp and outputs an electrical signal, and signal information of “non-crossable” and “crossable” based on the output signal of the light-receiving element to the pedestrian A receiver comprising: main transmission means for transmitting; and auxiliary transmission means for transmitting information related to the reception status of the receiver to a pedestrian based on the intensity of the output signal of the light receiving element. The receiver of claim 1, wherein
The main transmission means outputs “crossing impossible” and “crossable” signal information as main voice, and the auxiliary transmission means outputs information related to the reception status as auxiliary voice different from the main voice. Feature receiver. The receiver of claim 2, wherein
A receiver characterized by superimposing and outputting an auxiliary voice indicating the reception status on a main voice indicating "crossing is impossible" and "crossing is possible". The receiver according to any one of claims 1 to 3,
The intensity of the output signal of the light receiving element is compared with a plurality of determination levels whose level height is changed stepwise, and information on the reception status is transmitted to the pedestrian based on the comparison result with each determination level. A receiver characterized by: The receiver of claim 4, wherein
The maximum value of the output signal of the light receiving element is sampled, and the maximum value is set as the highest determination level, and a plurality of determination levels are set in stages, and compared with the level of the output signal of the light receiving element. A receiver characterized by:

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