HC Deb 15 May 1989 vol 153 c66W
Mr. Kirkwood

To ask the Secretary of State for Defence what are the definitions of the noise level measurement systems(a) LA, (b) LOASP, (c) LPN, (d) LTPN, (e) LEPN, and (f) LAX; and which of these systems of measurement was used in (i) the figures provided in his reply to the hon. Member for Roxburgh and Berwickshire on 22 March, Official Report, columns 617–18 and (ii) the figure of 125 dB (A) used in his Department's policy on noise compensation arrangements.

Mr. Neubert

The systems listed are defined as follows:

  1. (a) LA—maximum 'A' weighted sound pressure level;
  2. (b) LOASP—overall 'A' weighted sound pressure level;
  3. (c) LPN—perceived noise level;
  4. (d) LTPN—Tone-corrected perceived noise level;
  5. (e) LEPN—effective perceived noise level;
  6. (f) LAX—single event sound exposure level;

The 'LA' system of measurement was used in the figures provided in the reply to the hon. Member for Roxburgh and Berwickshire on 22 March, Official Report, columns 617–18 and in the figure of 125 dB(A) used in the Ministry of Defence noise compensation policy.