JP2006157403A - Loudspeaker for bus stop - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a loudspeaker for a bus stop which prevents sound from spreading to the surrounding area and can simultaneously broadcast a plurality of types of sound. <P>SOLUTION: This loudspeaker for a bus stop is provided with modulators 22 for modulating a carrier, belonging to an ultrasonic wave band by an audible sound signal, parametric speakers 10 for emitting modulated signals from the modulators 22 as a super-directivity sound wave to transfer an audible sound via the super-directivity sound wave, human detection sensors 11 for sensing that a person enters an audible area 30 where the audible sound from the parametric speakers 10 is audible, and a sound control part 21 for storing a plurality of pieces of sound guide data, and selecting the sound guide data, corresponding to a signal indicating that a person has entered the audible area, to convert the sound guide data into an audible sound signal, supplying the audible sound signal to the modulators 22, when the signal is received from the human detection sensors. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bus stop loudspeaker that is installed at a bus stop and provides voice guidance.

  FIG. 3 is a diagram for explaining an installation example of a conventional bus stop loudspeaker. As shown in the figure, the bus stop loudspeaker is installed in a bus stop 100 having a timetable 101, a guide plate 102, and the like. The dynamic speaker 201 of the bus stop loudspeaker is installed on the roof 103 of the bus stop 100 and generates radiated sound 202. The radiated sound 202 from the dynamic speaker 201 is diffused and transmitted in and around the bus stop 100. Prior art in this field includes, for example, Patent Document 1.

JP 2000-402916 A

  As described above, since the conventional bus stop loudspeaker radiates sound from the dynamic speaker 201, the radiated sound 202 spreads around as shown in FIG. It was noisy. Therefore, there is a problem that a place where the loudspeaker for bus stop can be installed is limited. Also, if a plurality of dynamic speakers are installed at the bus stop 100 and different voice guidance messages are broadcast simultaneously from each other, the voice guidance messages will be mixed together, so that a plurality of types of voice guidance messages cannot be broadcast at the same time. There was a problem.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a bus stop loudspeaker that can prevent sound diffusion to the surroundings and simultaneously broadcast a plurality of types of sounds. To do.

  A loudspeaker for bus stop according to the present invention modulates a carrier wave belonging to an ultrasonic band by an audible sound signal, radiates a modulation signal from the modulator as a superdirective sound wave, and outputs the superdirective sound wave. Audible sound through a parametric speaker, a human sensor that senses that a person has entered the audible area to which the audible sound from the parametric speaker reaches, and a plurality of voice guidance data that are audible from the human sensor When a signal indicating that a person has entered the area is received, voice guidance data corresponding to the signal is selected, converted into an audible sound signal, and supplied to the modulator.

  According to the present invention, a bus stop loudspeaker modulates a carrier wave belonging to an ultrasonic band by an audible sound signal, radiates a modulation signal from the modulator as a superdirective sound wave, and transmits the superdirective sound wave. A parametric speaker that transmits audible sound through sound waves, a human sensor that detects that a human has entered an audible area where the audible sound from the parametric speaker reaches, and a human sensor that holds a plurality of voice guidance data When a signal indicating that a human has entered the audible area is received, the voice guidance data corresponding to the signal is selected, converted into an audible sound signal, and supplied to the modulator. In addition, there is an effect that it is possible to obtain a bus stop loudspeaker capable of preventing sound diffusion to the surroundings and simultaneously broadcasting a plurality of types of sounds.

Embodiment 1 FIG.
FIG. 1 is a block diagram of a bus stop loudspeaker according to Embodiment 1 of the present invention. As shown in the figure, the bus stop loudspeaker includes parametric speakers 10 and 10 ′ and a processing device 20. The processing device 20 includes an audio control unit 21, modulators 22 and 22 ′, and an amplifier 23. The parametric speakers 10 and 10 'are provided with human sensors 11 and 11', respectively.

  FIG. 2 is a diagram illustrating an installation example of a bus stop loudspeaker. As shown in the figure, the bus stop loudspeaker is installed in a bus stop 100 on which a timetable 101, a guide plate 102, and the like are installed. Parametric speakers 10 and 10 'serving as radiators are housed in the roof 103 of the bus stop 100, and radiate sound from the roof toward the ground to places where voice guidance is necessary, such as where the timetable 101 and the guide plate 102 are installed. It is installed as follows. Alternatively, the sound may be radiated toward the roof 103 installed on the ground near the timetable 101 and the guide plate 102. Parametric speakers 10 and 10 'transmit sound only to audible areas 30 and 30', respectively. Here, the two parametric speakers 10 and 10 ′ and the modulators 22 and 22 ′ corresponding to the parametric speakers 10 and 10 ′ are provided, but the number of installations may be increased or decreased as desired. Although not shown, the processing device 20 may be stored in the roof 103 or installed on the ground.

  The human sensors 11 and 11 ′ are sensors that detect that a person has entered the audio audible areas 30 and 30 ′ of the parametric speakers 10 and 10 ′, respectively. The external control signal 24 is supplied. The voice control unit 21 holds a plurality of voice guidance messages to be reproduced and selects an appropriate voice guidance message according to the external control signal 24 received as described above. For example, in FIG. 1, if a person is reading the timetable 101, the human sensor 11 senses the person and supplies it to the voice control unit 21 as an external control signal 24. The voice control unit 21 determines that the signal is from the human sensor 11 installed on the upper part of the timetable 101 based on the received external control signal 24, and sends a voice guidance message suitable for the person who reads the timetable 101. select. When the voice control unit 21 receives the external control signal 24 from the human sensor 11 ′ installed on the upper part of the guide plate 102, the voice control unit 21 selects a tourist guidance message or the like.

  The voice control unit 21 converts the selected voice guidance message into an audible sound signal, and supplies it to the modulator 22 or 22 'according to the audible sound signal. The modulators 22 and 22 ′ modulate the ultrasonic wave carrier wave with the received audible sound signal, and send the modulated signal to the amplifier 23. The amplifier 23 amplifies the received modulation signal and supplies it to the corresponding parametric speaker 10 or 10 '. The parametric speaker 10 or 10 'radiates the received modulated signal into the air as a superdirective sound wave. An audible sound is transmitted via this super-directional sound wave. The radiated voice guidance message has strong directivity leaving the characteristics of ultrasonic waves, and the voice can be heard only in the audible area 30 or 30 '.

  As described above, according to the first embodiment, the parametric speakers 10 and 10 'are installed on the ceiling portion of the bus stop 100 where voice guidance is necessary, and the voice control unit 21 selects a voice guidance message according to the location. Since the modulators 22 and 22 'modulate the ultrasonic wave carrier wave with the audible sound signal and the parametric speakers 10 and 10' emit as superdirective sound waves, the voice guidance message is limited to a certain range. It is transmitted, and the effect that no noise is generated in the surrounding environment of the bus stop 100 such as a residential area is obtained. In addition, by installing a plurality of parametric speakers 10 and 10 ', it is possible to simultaneously broadcast a plurality of different voice guidance messages according to the installation location without mixing the voices.

1 is a block diagram of a bus stop loudspeaker according to Embodiment 1 of the present invention. FIG. It is a figure which shows the example of installation of the bus stop loudspeaker by the same Embodiment 1. FIG. It is a figure which shows the example of installation of the conventional loudspeaker for bus stops.

Explanation of symbols

  10, 10 ′ parametric speaker, 11, 11 ′ human sensor, 20 processing device, 21 voice control unit, 22, 22 ′ modulator, 23 amplifier, 24 external control signal, 30, 30 ′ audible area, 100 bus stop, 101 Timetable, 102 Information board, 103 Roof, 201 Dynamic speaker, 202 Radiated sound.

Claims (2)

A bus stop loudspeaker installed at a bus stop to transmit voice guidance,
A modulator that modulates a carrier wave belonging to an ultrasonic band by an audible sound signal;
A parametric speaker that radiates a modulation signal from the modulator as a superdirective sound wave and transmits an audible sound via the superdirective sound wave;
A human sensor for detecting that a human has entered an audible area to which an audible sound from the parametric speaker reaches,
When a signal indicating that a person has entered the audible area is received from the human sensor, the voice guidance data corresponding to the signal is selected and converted into an audible sound signal. A bus stop loudspeaker comprising a voice control unit for supplying to the bus stop.   2. The bus stop loudspeaker according to claim 1, wherein the parametric speaker is installed to emit sound waves from the roof toward the ground at a place where voice guidance is required at the bus stop.

Images