(25) RR Noise Control

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An excerpt from Railroad Noise Control, Handbook for the Measurement, Analysis and Abatement of Railroad Noise, NTIS, DOT /FRA/ORD-82/02H, January 1982, pages 237-239

Abstract
     This handbook gathers together in one place the necessary background material, the required measurement and analysis procedures, and the currently available abatement techniques to respond to and meet current railroad noise regulations.
     The first chapter of the handbook briefly describes its' development, arrangement, and suggested use. The second chapter provides an introduction to the field of acoustics. Numerous examples are provided to clarify the concepts which are developed.
     The remaining three chapters of the handbook describe the existing railroad noise regulations themselves. …
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     In addition to the five major chapters of the handbook, four appendices provide … a glossary … a set of three programmable calculator programs which can be used to carry out some of the more common arithmetic operations on sound levels … reproduction of the pages … a list of suggested books and journals …
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                                                            APPENDIX B
                                   Software For Programmable Calculators
     This appendix contains three programs, written for portable programmable calculators, which perform various operations described in Section 2. Each program is presented in two versions:
          • Reverse Polish Notation (RPN) such as is used in Hewlett-Packard (HP) calculators, and
          • Algebraic Notation such as is used in Texas Instrument (TI) calculators.
     The programs below are written in languages specific to the HP-25 and TI 58/59 programmable calculator models. They can easily be adapted for all other programmable calculator models of these and other manufacturers. In these programs, O stands for the letter "O" while ⊘ stands for the numeral zero.

Decibel Addition and Subtraction
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Energy-Equivalent Sound Level
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Day-Night Sound Level
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