Annex 1 - Recommendation on Performance Standards for Sound Reception Systems
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Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.86(70) - Adoption of New and Amended Performance Standards for Navigational Equipment - (Adopted on 8 December 1998) - Annex 1 - Recommendation on Performance Standards for Sound Reception Systems

Annex 1 - Recommendation on Performance Standards for Sound Reception Systems

 1 INTRODUCTION

1.1 Sound reception systems are acoustical electronic navigational aids to enable the officer on the watch to hear outside sound signals inside a totally enclosed bridge in order to perform the look-out function as required in the International Regulations for Preventing Collisions at Sea, 1972.

1.2 Sound reception systems should, in addition to the general requirements contained in resolution A.694(17), comply with the following minimum requirements.

2 FUNCTIONAL REQUIREMENTS

2.1 Sound reception systems should be capable of:

  • .1 receiving sound signals from all directions in the audio band 70 Hz - 820 Hz;

  • .2 reproducing incoming sound signals acoustically inside the bridge;

  • .3 indicating the approximate direction of incoming sound signals to determine at least whether the sound signal being detected is forward or abaft of the beam and from which side of the ship it is being detected;footnote and

  • .4 suppressing unwanted background noise and allowing reception of meaningful sounds.

3 METHOD OF PRESENTATION

3.1 Incoming sound signals should be reproduced inside the bridge by means of at least one loudspeaker.

3.2 The volume should be adjusted by means of one volume control only. The volume control should be capable of being set so that the sound pressure level of an incoming signal only is at least 10 dB(A) above the bridge noise level.

3.3 There should be a display which gives a visual indication for at least 3 s of the incoming signals and their approximate direction.

4 INSTALLATION

4.1 The microphones should be installed in such a way that they are as far from noise sources in the ship as is reasonably practicable and wind induced noise and mechanical vibrations are reasonably reduced.

4.2 The display should be installed so that it is visible at least from the conning position.

4.3 The loudspeaker(s) should be installed so that incoming sound signals are audible at all positions inside the bridge.

Parent topic: Resolution MSC.86(70) - Adoption of New and Amended Performance Standards for Navigational Equipment - (Adopted on 8 December 1998)
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