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24 March 1965

Purcuant to our recent conversations, the follov
ing represent uy underotanding of the gcnoral.format
forthedeuonotrntion: Four platforcs vill be available comploto for the demonstrations. Ye vill uso. the.receiving equipaont at the two sources for llo volts with the platforns in the ficld. of. sone description for this. purposewil be necescary
S/N improvenent dcconstration involving taped inputs and outputs vill be ready.: Due tothe shortnosa of tine, it naybe. that this deaonstrationshould be put on tape and simply played to: the spectators at the denonstration site.(see attached:genoral structuring)
Tho volune incrense/attention to a particular sounddomonstrationcouldpossiblyalsobe tapod for. play. back.as in b.. above
A. general discussion concerning the theory vig-a-visthe cove
A goneraldiscussion regardingonticipatod ((tcntative and, can be

be deaongtrated if it is available.I vonld anticipate thst this wouldrequiro an evening scssionin the laboratorys hswo provioucly agreed, it is ny undcrstanding-that you vill.carry out all necessary procedures for-the four platforos above:exceptinstallation thich will bo postponed until 2-3 veeks prior to the

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dezonstration.Por nttachncnt, the additional atudies to be initiuted here.vill hopefully produce en.. advancein the otato-of-thc-art.in.tino for incorporation into your dononstration platforms.If not, then the old :style will bo usod.I vill be in further coa-

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A taped calibrnted input for both S and N at equivalent sound pressure-levels.A taped calibratedoutput (corrected for10- 12db pinna and mcatus gain). It may be possible, toalsohave scope

photographed displnys of the same data. It
is important,"I believe, to also havea standard
mike listen to the same taped calibrated input
with the same output display for. comparicon
purposes
The above should give a direct measure of S/N
improvement for both the platform performance
and conventional mikeperformance
This same technique, it seens to me, could be put
to valuable use for qunntitative calibrations