Abstract: A non-destructive method of testing of fruits and vegetables for post-harvest quality (firmness, texture, aroma and color) using fluorescence intensity of the skin or leaves is described. A low intensity red light source (10) is used to irradiate the skin or leaves of fruits or vegetables to provide a first level F.sub.o of fluorescence intensity above that of red light in the 710 to 740 nM range. A second high intensity red light source is used to produce a maximal second fluorescence intensity F.sub.m in the skin or leaves in the 710 to 740 nM range. The ratio F.sub.v /F.sub.m =(F.sub.m -F.sub.o)/F.sub.m is then preferably determined to provide a measure of the quality of the fruit or vegetable.

Abstract: The meantone temperer external device is used in conjunction with a keyboard or other musical instrument. The meantone temperer is used to temper the connected musical instrument to any desired meantone-tempered scale, which is selected by the user. This device is operated by simply entering the desired temperament on the input keypad and pressing the "temper" button. Calculations are then made and the results are stored in RAM. When the user strikes a note on the musical instrument, a value is pulled out of RAM corresponding to the note struck. This value is then multiplied by the corresponding octave multiplier in ROM and the tempered note is sounded.

Abstract: A plurality of acoustical transducers such as microphones are placed in appropriate array so that they are capable of detecting sonic energy emanating from an acoustical source such as an aircraft or a ground vehicle. The outputs of the transducers are sequentially sampled and multiplexed together, the time multiplexed signals then being converted from analog to digital form in an analog/digital converter. The output of the analog/digital converter is fed to a fast Fourier transformer (FFT), which transforms these signals to Fourier transform coefficients represented as real and imaginary (cosine and sine) components. The output of the fast Fourier transformer is fed to a digital processor. In this processor, the power and phase of each frequency bin for each microphone output is determined and the phase differences between signals received by pairs of microphones for each frequency bin of interest are determined.