Correspondence Comments To: Infrasounds in Residential Area - A Case Study

ISO 389-7:1995. Acoustics – Reference zero for the calibration of audiometric equipment – Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions.

Watanabe Toshio and M⊘ller Henrik : Hearing thresholds and Equal Loudness Contours in Free Field at Frequencies Below 1 kHz. Journal of Low Frequency Noise and Vibration, Vol. 9, No. 4, pp. 135–148, 1990.

Watanabe Toshio and M⊘ller Henrik : Low Frequency Hearing Thresholds in Pressure Field and in Free Field. Journal of Low Frequency Noise and Vibration, Vol. 9, No. 3, pp. 106–115, 1990.

ISO 226:1987. Acoustics – Normal equal loudness level contours.

ISO 7196:1995. Acoustics – Frequency-weighting characteristic for infrasound measurements.