The vibration is transmitted through the air as acoustic waves, which generates the sound. Sensory crispness is therefore the perception of deformation and time events but, almost and primarily, of their simultaneous acoustical effects (Piazza et al., 2007). Peleg and Normand (1995) showed that jaggedness of the force–deformation curves was the key characteristic that correlated with crispness. Following this hypothesis, both acoustic data and force–deformation curves have been analyzed using fractal analysis and have been related to crispness. The sound emission technique has been used as an objective texture measurement of brittle food product since sixties (Drake, 1963). Determination of a number of mechanical and acoustic events has been proposed to be a good approach to quantify crispness (Roudaut et al., 2002). This research was conducted in order to study the effect of temperature and frying time on quality attributes of the fried cassava crackers by using force–displacement measurement in combination with corresponding sound emission