Abstract: Speech analysis is performed by synchronizing, with the initiation of glottal pulses produced during the voicing of phonemes, a pitch-independent transform that performs analysis entirely within a pitch period. Analysis is made of the three most dominant formant frequencies of the sound sets involved in the enunciation of voiced phonemes. Peaks in the transform represent formant frequencies. Three peaks are selected from the transform identifying the frequencies with the first, second and third greatest amplitudes. Correlation of the waveform between successive pitch periods detects whether a sound is a vowel, a voiced sibilant, or unvoiced. Unvoiced sound sets are similarly analyzed but the analysis is synchronized with artificially generated synch pulses. The sound sets are analyzed to determine (1) whether the sound is a vowel, a voiced sibilant or an unvoiced sound; (2) the primary formant frequency, i.e.

Abstract: This is an in-situ telemetry apparatus for the measurement of dynamic moduli, a key design parameter, of the propellant mass of solid fuel rocket engines.

Abstract: The method and sensors are capable of measuring dynamic moduli of nongaseous fluid and semi-fluid materials. When cast in a castable-type material, such as solid rocket propellant, changes due to chemical aging of the propellant or other substances being tested may be detected. The sensors include a spacer separating a pair of piezoelectric crystals with substantially no air gaps between the crystals. One of the crystals is driven while the other is connected to a recording device. The measured response of the sensor in-situ or immersed in a work sample is compared with the response in air. The elastic modulus and loss tangent of the tested material may be computed based upon the amplitude and phase of the sensor's response.