Panasonic WX-LA20 User manual

Other manuals for WX-LA20

13

This manual suits for next models

3

Table of contents

Other Panasonic Accessories manuals

Panasonic

Panasonic KX-HNS107 User manual

Panasonic

Panasonic CZ-CSRC2 User manual

Panasonic

Panasonic MA27111 User manual

Panasonic

Panasonic HL-C1 Series User manual

Panasonic

Panasonic PE Series User manual

Panasonic

Panasonic MA2YD21 User manual

Panasonic

Panasonic AY-PB2003 User manual

Panasonic

Panasonic MA4ZD03 User manual

Panasonic

Panasonic MA27P06 User manual

Panasonic

Panasonic UE-608040 User manual

Panasonic

Panasonic LS-H Series User manual

Panasonic

Panasonic Light Emitting Diodes LNG692CF6 User manual

Panasonic

Panasonic MAZDxxxG Series User manual

Panasonic

Panasonic SN-GCJA5L User manual

Panasonic

Panasonic MA22D28 User manual

Panasonic

Panasonic MA24F70 User manual

Panasonic

Panasonic GP-X SERIES User manual

Panasonic

Panasonic HG-C Series User manual

Panasonic

Panasonic GX-M Series User manual

Panasonic

Panasonic LS-400 Series User manual

Panasonic

Panasonic HL-G1 Series User manual

Panasonic

Panasonic DVCPRO AJ-BS901P User manual

Panasonic

Panasonic HL-G1-A-C5 Series User manual

Panasonic

Panasonic MA24F41 User manual

Popular Accessories manuals by other brands

Hillco

Hillco 2810 Operator's manual

Siemens

Siemens QSA2700D Basic documentation

Contours

Contours ZY024 manual

Saivod

Saivod VS621 manual

Virtuox

Virtuox VirtuCLEAN 2.0 user manual

SCE

SCE ENVIRO-THERM SCE-TE170B24VSS user manual

Z-Wave

Z-Wave HSD-200Z user manual

turck

turck FMX-IM-2UPLI63FX quick start guide

Decagon Devices

Decagon Devices 10HS manual

UPPAbaby

UPPAbaby Cup Holder user manual

Elko

Elko SmartSensor Leakage Wireless manual

Grizzly

Grizzly H8371 instructions

IFM Electronic

IFM Electronic Efector 250 Series Brief instructions

DigiDesign

DigiDesign 888/24 I/O installation guide

PROZIS

PROZIS QUAY user manual

patagonia

patagonia PSI Vest user manual

SFC Energy

SFC Energy EFOY GO! manual

Axminster

Axminster Tooling Stylus Tip Ballpoint Pen Kit instruction manual

Classroom Acoustics: A Failing Grade

(Summary)

Hearing Health, Sept/Oct 1998, pp. 11-16,59

Carl C. Crandell, Ph.D.

Recent investigations of the acoustical properties of classrooms and their impact

on students have revealed disturbing findings. Inappropriate acoustics can

negatively influence speech perception, on-task behavior, reading and spelling

ability, behavior, attention, concentration, and academic achievement. This is

extremely troubling for classrooms that house younger students as young

children require better acoustical environments than adults with normal hearing

to achieve equivalent perception scores.

A study conducted in the 80’s demonstrated that noise was the sole factor for 50

– 75% of variant reading delays of elementary school children. When classroom

noise was reduced through acoustical modification, increases in concentration,

attention, and participation were seen. Acoustical improvements for classroom

environments include:

1. Acoustical modifications

The optimum levels for classroom acoustics are +15 dB signal to noise ratio

(SNR) and reverberation (reflected sound energy) times should not surpass 0.4

seconds. In 1995, a survey of 32 classrooms showed that only 7 met

recommended reverberation times and none achieved recommended noise

levels. An explanation for this lies in the fact that only a little more than half (59%)

of the rooms were carpeted, 15% had acoustical wall modifications, 3%

contained partitions or drapes, and none of the rooms had acoustically modified

furniture.

2. Reduction of speaker-to-listener distance (SLD)

This allows for the direct sound field to dominate the communication. When the

SLD is increased, the indirect sound field dominates the listening environment.

Speech recognition is only optimal within the direct sound field. To reduce poor

Continued…

…cont’d

classroom acoustics, close SLD should be utilized whenever possible. One way

to improve SLD is to use small group instruction over traditional seating

arrangements.

3. Utilization of classroom amplification

The implementation of classroom amplification can decrease SLD and

significantly affect speech perception. The Mainstream Amplification Resource

Room Study (MARRS, 1981) demonstrated drastic improvements in academic

achievement when students received amplified instruction.

By increasing the teacher’s voice by approximately 10 dB and providing a

uniform sound field throughout the classroom, students display perceptual and

psycho-educational improvements.

The large body of acoustic research in classrooms supports the need for good

acoustics in teaching environments. Several strategies can alleviate the

damaging effects of poor acoustics, one of which includes sound field

amplification. By adopting these solutions and strategies, it will be in the best

interest of the students.

Classroomaudi[email protected]

877.268.7215