Audio3 Warbler Manuale utente

Manual

v1.10

Audio3

Warbler

Free-ﬁeld Audiometer

2 3

WelcomeContents

Thank you for purchasing the Audio3 Warbler free-ﬁeld audiometer. We

believe it is one of the ﬁnest audiometric devices available and hope you

will enjoy using it.

Audio3 is owned and operated by hearing research scientists who study

hearing loss (NIHL). We are dedicated to reducing the prevalence of

hearing loss and improving the diagnosis and treatment of hearing

loss. Our primary concern is hearing health. The Warbler is unique

among audiometers; it is easy to use, beautifully made and features Ling

sounds and narrow-band music stimuli in addition to warble tones and

Freshnoise. It is also highly accurate.

This manual gives you all the instructions you will need to get the most

from your Warbler.

Further information may be found at the Audio3 web site, audio-3.com.

Warm Regards,

Managing Director

Contents ..................................................................2

Welcome..................................................................3

In the Box.................................................................4

Safety .......................................................................5

User Interface Overview........................................................................... 6

Getting Started ......................................................6

Charging the Battery.................................................................................7

Checking Warbler on Arrival...................................................................8

The Hood........................................................................................................9

The Display ................................................................................................. 10

Operating the Warbler........................................................................... 12

User Controls Flow Diagram................................................................ 14

Overview of Stimuli................................................................................. 16

Stimuli....................................................................16

Tone............................................................................................................... 17

Warbletone & Freshnoise...................................................................... 18

Sounds ......................................................................................................... 20

Ling sounds................................................................................................ 22

Songs ............................................................................................................ 24

Scale .............................................................................................................. 26

Calibration Overview.............................................................................. 28

Calibration.............................................................28

Calibration Materials and Setup ........................................................ 29

Calibration Charts .................................................................................... 30

Calibration Procedure ............................................................................ 31

Technical Specications........................................................................ 32

Specications .......................................................32

Regulatory Symbols................................................................................ 33

Recycling..................................................................................................... 34

EMC Compliance...................................................................................... 34

Manufacturer Declaration.................................................................... 35

Warranty / Service ...............................................36

References.............................................................37

Parts .......................................................................39

Contents

Welcome

4 5

In The Box Safety Information

Important Safety Information

1. Disposal

Do not dispose of the Warbler in municipal waste. e device contains a lead-acid battery and special

collection must be used as denoted by the wheelie bin symbol.

2. Water and moisture

Keep your Warbler dry, water and moisture can damage it. e Warbler tolerates 5% to 95% relative humidity.

3. Heat

Keep your Warbler away from ames and heat producing appliances such as radiators, stoves, toasters, etc. e Warbler

tolerates -25 to 50 °C (-13 to 122 °F).

4. Climate

e Warbler has been designed for use indoors. Extreme heat, cold or humidity can damage the unit. To prevent possible

damage from a power surge, do not plug the unit into a mains-connected charger during lightning storms.

5. Cleaning

e Warbler wooden case only requires an occasional wipe with a so, lint-free cloth. Use can use alcohol wipes or other

antibacterial wipes. Do not use harsher chemical solvents, household cleaning agents or polishes. ese chemicals can

damage it. e glass lens may be cleaned using a so, lint-free cloth dampened with a non-abrasive household glass cleaner.

6. Charging and Storage

To charge your Warbler, connect it to mains power via the included charger. Only use a CE-marked 12v lead acid battery

charger with <500mA output to charge the Warbler, use of another charger could damage the device. During periods of

non-use, store the Warbler in a cool (< 30 °C), dry place (< 50 % humidity). It should be charged at least once a year to

retain its calibration information and to help extend the battery’s lifespan.

7. Choking Hazards

Eort have been made to minimize choking hazards, however, removable socket dust-caps or retaining screws could

become separated from the device. Please insure that no such small stray parts are within reach of children.

8. Abnormal smell

If any abnormal smell or smoke is detected coming from the unit, immediately unplug the unit, turn it o, and contact

your dealer—do not reconnect the equipment.

9. Servicing

Parts of this low voltage (12v) device are eld-serviceable by technicians with knowledge of electrical safety and ESD

issues.

10. Safety compliance

is equipment has been designed to meet the IEC/EN 60601-1 international electrical safety standard. Operation is

subject to the following two conditions: (1) is device may not cause harmful interference, and (2) this device must

accept any interference received, including interference that may cause undesired operation.

Safety

In the Box

charger

Warbler

hood

6 7

Getting Started

Charging the Battery

Getting Started

User Interface Overview

3.5mm headphone jack

(headphone audiometry)

3.5mm auxiliary source

jack

Display

(battery level + settings)

Push selector knob

(on/o )

Rotary selector knob

(choose sound)

Frequency toggle

(inc. / dec. frequency)

Level toggle

(inc. / dec. level)

Touch switch

(present signal)

Charging Port

(power / charging)

LCD

14v

Before using the Warbler, charge its battery using the included charger. It takes

several hours to recharge. e included charger has a microprocessor to correctly

charge the battery, the status of the charger is indicated by its LED indicators:

LEDs Description Charger status

Steady Red charging

Steady Green charge complete

Steady Red, Steady Green no battery connected

Steady Red, Flashing Green reverse polarity error

Flash Red, Flash Green short circuit

Flash Red battery low voltage (trickle charge)

Flash Green timeout (forced end of charging)

How long will the battery last?

e battery will last for about 5 under continuous use. Each bar on the battery

indicator represents 20% capacity or 1 hour. When the battery drops to 10%, the

Warbler will turn o automatically.

Will I need to replace the battery?

e Warbler has a battery protection circuit that disconnects the battery when

its voltage is too low. is prevents the battery from being damaged and reduces

the number of times the battery will need to be replaced. Still, you may need to

replace the battery aer 5 years or 300 charge cycles.

Note: If the battery protection circuit has been tripped, the device will not turn

on again until it is connected to the included charger.

WARNING: e battery should only be replaced by a qualied technician.

Please contact Audio3 at audio-3.com or your local sales oce to arrange to

replace the battery.

FLFL

Table 1 Charger Status LEDs

Figure 1 Positions of Controls and Indicators

8 9

Getting Started

The Hood

Checking Warbler on Arrival

Purpose of the Hood

e Warbler is provided with a hood (optional). e hood is designed to hide the

operator’s hand movements in order to remove any potential visual cues related to

the presentation of sound stimuli. Audio3 recommends using the hood to avoid

having reactions to visual cues being interpreted as auditory ones.

Attaching the Hood

e hood attaches to the device with magnets as shown.

Verifying Operations

On arrival, charge Warbler by pluggin it into an approved 12v Lead acid battery

charger as decribed in the previous “Charging the Battery” section. Take this

time to read this whole manual and familiarize yourself with the operation of the

Warbler before doing the verication below.

Once charged verify that the user controls and the LCD are working properly..

Turn the unit on, present stimuli and verify that all the mechanical switches are

working by operating them and satisfy yourself that the frequency toggle, level

toggle and sound type knob all produce the correct sound output and LCD

display output as described in this manual.

e device should arrive recently calibrated. If you do not have access to a sound

level meter, a quick way to insure that the calibration is accepatble is to ask a person

normal-hearing person with known good audiometry to listen and determine

that the sounds coming from the speaker is the same perceptual loudness while

changing the stimulus frequency. Note that WarbleTone and FreshNoise stimuli

should sound as loud as each other at each frequency too.

To make sure the headphone jack is outputting properly attach standard dynamic

headphones to the 3.5mm jack and listen as you present stimuli through the

headphones. We do not provide headphones so these sounds are uncalibrated.

Finally to test the auxiliary input plug a mono (le only) or stereo source (le

channel) into the source jack. e sound source should automatically switch to

that one. Check that you can change the level with the level toggle. e Frequency

toggle and sound type knob will do nothing when an auxiliary source is connected.

Figure 2 Picture of the Warbler with hood attached

10 11

Getting Started

The Display

battery indicator

play / pause

event ag

frequency indicator

bar graph

% modulation

level and type

calibration or

stepsize delta

dBHL or

dBA units

subject

response

(unused)

headphone output

*note: Range is 250Hz to 8kHz (‘10’ position =1kHz)

On the main page, the Warbler’s LCD displays the sound level (dB HL when dB is

shown or dBAmax). If the frequency is changed the new frequency is briey (1s)

displayed on the main page. In addition the frequency bar graph will display qualitative

frequency information.

e display uses special characters for unusual functions (% as units for modulation

depth, as units for level stepsize or calibration osets, ags for errors, and ! for subject

responses).

Figure 3 Description of the LCD Display

Display Explanation

battery Level (each bar ~ 1 hr)

pause (no sound), play (sound is being presented)

Warbler error ag

sound level is displayed in dB HL (Tone, Warbletone,

Freshnoise)

sound level is displayed in maximum dBA weighting

(Songs, Ling sounds etc.)

AM modulation depth is displayed (Tone, Warbletone,

Freshnoise)

display shows sound level stepsize for toggle usually set to

5 dB (in calibration mode it shows the oset from factory

calibration)

subject response button is depressed (future release)

qualitative frequency content bargraph of the selected

sound (e.g. locations of formant peaks for Ling sounds)

headphone output selected (loudspeaker is muted)

Getting Started

Table 2 List of Display icons

12 13

Operating the Warbler

Switching on and o

To turn the Warbler on push the centre selector knob and release. To turn the

Warbler o press and release again.

Note: e Warbler automatically switches o aer 8 minutes of non-use or when

its battery capacity drops below 10%. If the battery gets very low you must connect

it to the supplied charger before the unit will turn on again.

Presenting a Stimuli

To present the last used stimulus touch the touch switch. e light under your

nger should light and the LCD will display a play arrow. If a headphone icon

appears on the LCD the output is being directed to the headphones.

Changing the Frequency

e frequency is adjusted by using the frequency up/down toggle. e frequency

will be displayed on the screen for 1s or until another button is pressed. Note:

While frequency is displayed on the LCD the selector knob can be depressed and

simultaneously rotated anti-clockwise to decrease and ne-tune the frequency.

To return to the standard audiometric frequencies depress and rotate the selector

knob clockwise until the frequency reaches its upper limit.

Changing the Level

e sound level is changed (typically in 5 dB increments) by using the level up/

down toggle. For Tones, Warble Tones and Freshnoise stimuli, the displayed level

is in dB HL (typically calibrated at 50 cm). For other stimuli the level displayed

is in dBAmax (the maximum dBA level (1s) that occurs during the whole stimuli,

see calibration section for more information).

Getting Started

Changing the Stimuli

From the main LEVEL page, rotate the centre selection knob to display and select

the desired sound stimulus. e selected sound will be displayed on the screen for

1s or until another button is pressed. Note: the last used sound will be used on

startup, and the display will show what sound is active on startup.

Changing the Output Transducer

From the device ‘o ’ press and hold the centre selector knob while simultaneously

rotating it to select the desired transducer (‘SPr’=speaker, ‘Ph L’=le headphone,

‘Ph r’=right headphone, ‘Ph b’= both headphones). When headphones are

selected a small headphone icon is displayed on the LCD. Release the knob to go

to use the Warbler with the selected transducer.

Changing the AM Modulation Depth %

Rotate the centre knob to display the sound selection. While the sound selection

is displayed, depress and simultaneously rotate the centre knob. A % sign will be

displayed. Rotate the knob to select the desired modulation depth (0=default to

100=full modulation). Release the knob to choose the displayed AM modulation

depth. Note: On startup the AM modulation is automatically returned o or 0%.

Changing the Level Stepsize 

From the main LEVEL page, depress the selector knob and simultaneously rotate

it to change the level stepsize. A sign will be displayed. Rotate the knob to the

le or right to select the desired stepsize (5 dB= audiometric default). Release the

knob to choose the displayed stepsize. Each level toggle will now increment of

decrement the sound level by that stepsize.

14 15

Getting Started

User Controls Flow Diagram

Getting Started

+/-5%

Press Knob

Toggle (Hz)

Rotate Knob

Toggle (dB)

SOUND

LEVEL

FREQ

TUNING AM

+/- 0.5 dB

STEPSIZE

+/- dB

O

Type

Auto-O

(8 min)

Auto

(1s)

Note: Amplitude

Modulation is

ignored for Ling,

Environment or

Music Stimuli

Note: In calibration

mode the Stepsize is

xed to 0.5 dB, and

the knob adjusts

calibration instead.

+/- Hz

KEY

Hold Down and Rotate

dB Hz

Auto

(1s)

Phones/Spkr

OUTPUT

Frequency

Adjustments

Sound

Adjustments

Level

Adjustments

To calibrate, rst

select desired trans-

ducer, then hold both

toggles up while

releasing knob.

CALIBRATE

Figure 4 User Control Flow

16 17

Stimuli

Overview of Stimuli

Accurate and reliable audiometry requires the skill of a trained audiologist. is

skill extends to selecting the appropriate stimuli for the situation. For example,

free-eld audiometry may be required for children who are too young to wear

headphones but tones are not appropriate in the free-eld due to room nodes--

Warbletones or Freshnoise should be used there. In other examples: children with

delayed social and communication skills may respond better to recognizable songs

while CI users may need stimuli that are centred on a single electrode’s mapped

frequency while measuring amplitude modulation detection. It is up to the

audiologist to determine the correct stimuli and protocol for their situation and

measurement needs. e Warbler provides a full range of stimuli.

Table 3 Stimuli Types

# Type Freqs. Level Use

1 Tone audiometric dBHL headphones

2 Warbletone audiometric dBHL free-eld

3 FreshNoise audiometric dBHL free-eld

4 Sounds various dBAmax children

5 Ling sounds various dBAmax speech

6 Twinkle Twinkle band-limited dBAmax children

7 Wheels on the Bus band-limited dBAmax children

8 5 Little Ducks band-limited dBAmax children

9omas Train band-limited dBAmax children

10 Scale band-limited dBAmax adults/demo

Stimuli

Tone

Tone stimuli are designed to be used for standard headphone audiometry.

Audio3 does not recommend using Tones with the loudspeaker as this can

create peaks and nulls due to room nodes within the testing room and a

poor audiometry result.

Table 4 Tone Accuracy when Calibrated

Min Typ Max

Frequency (%) -1.0 0 +1.0

Amplitude* (dB) -2.0 0 +2.0

THD+N (%) 0.001 0.005 0.01

*Amplitude accuracy assume high-quality calibration equipment is used.

THD+N noise levels will also depend on the headphones used.

Tone frequencies can be reduced by 50% from their default audiometric

frequencies. To do this switch to the desired frequency using the fre-

quency toggle and then, while the frequency is still displayed on the LCD

screen, rotate the center knob counterclockwise to the desired frequen-

cy. e new tuning will aect all frequencies. is change will remain in

eect until it is returned to the default tuning. is feature is useful for

exploring the frequency space in more detail.

18 19

Warbletone & Freshnoise

Stimuli

Warbletones and Freshnoise are designed to be used as free-eld or dif-

fuse-eld audiometric stimuli over the loudspeaker. e Warbletone gen-

erates frequency content using FM modulation while Freshnoise generates

its frequency content as a continuous narrow-band noise. In the Audio3

Warbler, these stimuli share the same frequency spectra and the same cal-

ibrated levels. You will get a consistent result whether using Warbletone or

Freshnoise and these stimuli are considered interchangeable. Which one

you choose to use is a matter of clinical judgment.

Table 5 Warbletone and Freshnoise Frequency Chart

Centre

Frequency

(Hz)

ERB

(Hz)

Freq.

Deviation

(%)

Low

Freq.

Cuto

(Hz)

High

Freq.

Cuto

(Hz)

Bandwidh

(Hz)

250 51.7 28.8 214.0 286.0 72.0

500 78.7 24.0 440.0 560.0 120.0

750 105.7 20.5 673.1 826.9 153.75

1000 132.6 17.0 915.0 1085.0 170.0

1500 186.6 13.0 1402.5 1597.5 195.0

2000 240.6 11.0 1890.0 2110.0 220.0

3000 348,5 9.0 2865.0 3135.0 270.0

4000 456.4 8.0 3840.0 4160.0 320.0

6000 672.3 8.0 5760.0 6240.0 480.0

8000 888.2 9.25 7630.0 8370.0 740.0

Figure 5 Frequency Response of Warbletone and Freshnoise

e gure opposite shows the measured frequency responses of the Warbletone

and Freshnoise sounds.

Warbletone & Freshnoise

Stimuli

0.1 1 10 0.1 1 10

-80

-60

-40

-20

250

-80

-60

-40

-20

500

-80

-60

-40

-20

750

-80

-60

-40

-20

1000

-80

-60

-40

-20

1500

-80

-60

-40

-20

2000

-80

-60

-40

-20

3000

-80

-60

-40

-20

4000

-80

-60

-40

-20

6000

-80

-60

-40

-20

8000

Frequency (kHz)

Relative Magnitude (dB)

Indice

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