Determining the audibility threshold (threshold of hearing)

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

Table 1

Fig.2. Audiogram

Conclusion:

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

Table 2.

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

Conclusion: