Panasonic WX-LA20 Manuel utilisateur

Autres manuels pour WX-LA20

13

Ce manuel convient aux modèles suivants

3

Table des matières

Autres manuels Panasonic Accessoires

Panasonic

Panasonic KX-HNS101 Manuel utilisateur

Panasonic

Panasonic VF Series Manuel utilisateur

Panasonic

Panasonic EX-F61 Manuel utilisateur

Panasonic

Panasonic MA2ZD14 Manuel utilisateur

Panasonic

Panasonic PE Series Manuel utilisateur

Panasonic

Panasonic LS-400 Series Manuel utilisateur

Panasonic

Panasonic Multi Chip Discrete UP05C8B Manuel utilisateur

Panasonic

Panasonic MA2J7280G Manuel utilisateur

Panasonic

Panasonic LX-111 Series Manuel utilisateur

Panasonic

Panasonic HG-TC101 Manuel utilisateur

Panasonic

Panasonic MA27P070G Manuel utilisateur

Panasonic

Panasonic HG-S Series Manuel utilisateur

Panasonic

Panasonic GP-X SERIES Manuel utilisateur

Panasonic

Panasonic MA6X126 (MA126) Manuel utilisateur

Panasonic

Panasonic MA3Z7920G Manuel utilisateur

Panasonic

Panasonic CF-VPF Series Manuel utilisateur

Panasonic

Panasonic MA2J111 (MA111) Manuel utilisateur

Panasonic

Panasonic HL-C2 Series Manuel utilisateur

Panasonic

Panasonic FX-301-F Manuel utilisateur

Panasonic

Panasonic KX-HNS104FX Manuel utilisateur

Panasonic

Panasonic MA2SP05 Manuel utilisateur

Panasonic

Panasonic SR-CN108 Manuel utilisateur

Panasonic

Panasonic HL-C2 Series Manuel utilisateur

Panasonic

Panasonic MAZWxxxHG Series Manuel utilisateur

Manuels Accessoires populaires d'autres marques

Hillco

Hillco 2810 Manuel utilisateur

Siemens

Siemens QSA2700D Manuel de l'opérateur

Contours

Contours ZY024 Manuel utilisateur

Saivod

Saivod VS621 Manuel utilisateur

Virtuox

Virtuox VirtuCLEAN 2.0 Manuel utilisateur

SCE

SCE ENVIRO-THERM SCE-TE170B24VSS Manuel utilisateur

Z-Wave

Z-Wave HSD-200Z Manuel utilisateur

turck

turck FMX-IM-2UPLI63FX Manuel utilisateur

Decagon Devices

Decagon Devices 10HS Manuel utilisateur

UPPAbaby

UPPAbaby Cup Holder Manuel utilisateur

Elko

Elko SmartSensor Leakage Wireless Manuel utilisateur

Grizzly

Grizzly H8371 Manuel utilisateur

IFM Electronic

IFM Electronic Efector 250 Series Guide de référence

DigiDesign

DigiDesign 888/24 I/O Manuel utilisateur

PROZIS

PROZIS QUAY Manuel utilisateur

patagonia

patagonia PSI Vest Manuel utilisateur

SFC Energy

SFC Energy EFOY GO! Manuel utilisateur

Axminster

Axminster Tooling Stylus Tip Ballpoint Pen Kit Manuel utilisateur

Acoustics in Educational Settings

(Summary)

American Speech-Language-Hearing Association

ASHA, March 1995, 37, pp. 15-19

The American Speech-Language-Hearing Association (ASHA) maintains the

position that all students should be provided with appropriate acoustical

environments in educational settings. Without the proper acoustical

characteristics in these environments, students will see a decline in their

attention, behavior, speech perception and learning.

ASHA has suggested that schools try to achieve the following to improve

listening conditions:

• Minimize speaker-to-listener distances by ensuring students sit in the direct

sound field of the teacher. Because students cannot always be in close range of

the teacher, artificial methods such as assistive listening devices should be used.

• Place classrooms in low traffic areas and away from external noise sources

such as playgrounds and HVAC equipment.

• Locate classrooms away from large group areas such as gymnasiums,

cafeterias and auditoriums.

• Landscape (trees, shrubs, and earthen banks) to reduce noise from external

sources.

• Equip classrooms with heavy carpeting, thick curtains and acoustical wall and

ceiling panels.

Because many of the suggestions above are impractical in all classrooms, ASHA

strongly supports the use of assistive listening systems in classrooms.

Research indicates improved speech recognition in students, both with normal

hearing and with hearing loss, who use amplification systems. Extensive

research and studies of acoustical conditions in classrooms reveal excessive

noise (any auditory disturbance) and reverberation (reflected sound energy).

Continued….

…cont’d

ASHA provides three (3) guidelines for proper acoustic environments in

educational settings.

1. Unoccupied classroom noise levels should not exceed 30 dB(A) or a Noise

Criteria (NC) 20 dB curve.

• This guideline is recommended to help achieve the appropriate levels in

guideline #2.

• The most detrimental noise is generated inside the classroom (talking,

sliding chairs and desks) due to the similar frequency shared with that of

the teacher’s voice.

2. Signal-to-Noise Ratio (SNR) at the student’s ear should exceed a minimum of

+15 dB.

• Speech recognition tends to deteriorate at a deficiency of +15 dB for

students with hearing loss.

• Depending on grade level, studies have shown that SNR levels range

from +5 to -7 dB. Students with normal hearing require +6 dB SNR for

optimum communication.

3. Reverberation times should not exceed 0.4 seconds.

• Research shows reverberation in unoccupied classrooms ranges from

0.4 to 1.2 seconds. These delays lead to speech degradation by delaying

1direct sound energy.

Classroomaud[email protected]onic.com

877.268.7215