The discussion of noise control continues, pursuing the second priority (see Part 11):  “Abate transmission of sound along its path.”  Although the singular form is used in the priority statement, sound from a single source may travel along several paths, each requiring its own analysis and solutions.  This fact complicates noise control efforts and reinforces the pursuit of source noise control (see Part 12) as the first priority.
     For sound sources that cannot be sufficiently tamed, a number of potential path treatments are available.  The pursuit of path noise control begins with identification of transmission paths.  Assessment of each path’s contribution to, or potential for mitigation of, the soundscape informs the selection of appropriate measures to be implemented.  Finally, implementation and verification complete the process.

     Limiting the amount of sound energy emanating from any given source is the best way to protect hearing and maintain effective communication.  This is reflected in the first noise control priority statement (see Part 11):  “Prevent emission of sound by a source.”  Control of noise at its source can take many forms, depending on the nature of the generator.
     In this installment of the “Occupational Soundscapes” series, various types of sources are discussed.  Representative examples of source treatments are provided to demonstrate the types of analysis that may be required.  Multiple treatments may be needed to tame a soundscape, bringing noise to a safe, manageable level.