Many engineers now carry a small electronic calculator in their pockets and use it for calculating the devilish decibel and other mundane tasks; however, when calculations become more complex a pencil and paper are required to jot down intermediate steps in the calculation. The next advance in calculators is the programmable pocket calculator such as the Hewlett Packard HP-45 which accepts magnetic cards containing the user's favorite programs, thus pen and paper are eliminated when either the operator or the basic calculator has insufficient storage capacity for intermediate steps in the calculation. Beyond this there appears to be a large gap in the current application of electronic calculators to audio engineering. Specialized tasks are handled by fast and expansive on-line computers and some intermediate applications involve custom designed systems which are attached to mini-computers. This paper is intended to fill parts of this gap, in that the application of a relatively cheap programmable calculator with standard interfaces and a few nonstandard additions is discussed in relation to common measurements in the field of audio engineering.
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