Determining the audibility threshold (threshold of hearing)

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Laboratory work №1

Determining the audibility threshold (threshold of hearing)

Purpose of the work: To determine the audibility threshold (threshold of hearing) for different audio frequencies.

Getting the audiogram by using generator of low-frequency signals (РГЗ-124).

Basical formulas:

The value of audibility threshold we can evaluate as the intensity of generator’s output signal:,

where Ld is intensity level, U is voltmeter signal value,  U0=1 V is initial (relative) voltage.

Table 1

f, Hz

lgf

Ld, dB

U, V

L, dB

200

2.30

400

2.60

800

2.90

1200

3.08

1600

3.20

2000

3.30

4000

3.60

6000

3.78

8000

3.90

10000

4.00

12000

4.10

14000

4.15

Fig.2. Audiogram


Conclusion:


1.1.  Audiogram getting using audiometer (УДК) (Fig.3).

Table 2.

f, kHz

Lleft, dB

Lright, dB

0,025

0,5

1

2

4

6

Fig.4. Audiograms for left (···) and right (***) ears

Conclusion:

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