Acoustic device for blind people

FUNCTIONAL CHARACTERISTICS OF RESERVATION SYSTEM PLS/03

• front pushbutton for crossing reservation of sighted people, with Led luminous sign confirming the reservation.
• pushbutton for crossing request of blind people put on the bottom surface of the box, provided with a directional tip, indicating the direction of the crossing: mechanical characteristics follow the EN 214-7 norm. This reservation, besides activating normal request for pedestrian crossing, enables the acoustic device for sound emission.
• emission of a constant acoustic signal to indicate the reservation made by a blind person, with a length of maximum 5s and frequency of 2Khz.

FUNCTIONAL CHARACTERISTICS OF RESERVATION SYSTEM ZEBRA

• front “TOUCH” button for crossing reservation of sighted people, with Led luminous sign confirming the reservation.
• TOUCH” button for crossing request of blind people put on the bottom surface of the box, provided with a directional tip, indicating the direction of the crossing: mechanical characteristics follow the EN 214-7 norm. This reservation, besides activating normal request for pedestrian crossing, enables the acoustic device for sound emission.
• Eemission of a constant acoustic signal to indicate the reservation made by a blind person, with a length of maximum 5s and frequency of 2Khz.

TECHNICAL FEATURES OF THE ACOUSTIC DEVICE

• It is possible to configure the device for automatic or for “on demand” functioning. With automatic method the sound emission will be active at any crossing phase while with “on demand” mode the sound emission occurs only after the reservation made by a blind person.
• Sound tone for “green” and “amber” signal is similar to a ring, with modulation frequency of 20 Hz or 10 Hz which can be set through an internal jumper (according to EN 214-7 norm). All through the green time of the pedestrian traffic lights to which it is linked, the device emits 60 sound impulses per minute, during amber time it emits 120 sound impulses per minute, self-adjusting the volume according to background noise.
• It is possible to change upper limit of emitted signal, either according to destination area and to day/night functioning, through an internal jumper or external timer.
• Acoustic device can be turned from 0° to 360° pointing to the centre of the pedestrian crossing in order to produce the highest sound intensity.

The tone of the impulse of the acoustic device is similar to a ring, with frequency modulation that can be set at 10 Hz or 20 Hz (in compliance to CEI 214-7 par. 5.1).
The acoustic signals are connected to the traffic signal head in the following way:

During pedestrian green light:

• Sound impulses = 60 per minute
• Sound level = +5 db on background noise
• Duty cycle 50%

During pedestrian amber light:

• Sound impulses = 120 per minute
• Sound level = +5 db on background noise
• Duty cycle 50%

During pedestrian red light:

• No sound