L. Chen and U. L. Opara, “Texture measurement approaches in fresh and processed foods - A review,” Food Res. Int., vol. 51, no. 2, pp. 823–835, 2013, doi: 10.1016/j.foodres.2013.01.046.
 Z. Fathizadeh, M. Aboonajmi, and S. R. H. Beygi, “Nondestructive firmness prediction of apple fruit using acoustic vibration response,” Sci. Hortic., vol. 262, no. November 2019, p. 109073, 2020, doi: 10.1016/j.scienta.2019.109073.
 M. Aboonajmi, M. Jahangiri, and S. R. Hassan-Beygi, “A Review on Application of Acoustic Analysis in Quality Evaluation of Agro-food Products,” J. Food Process. Preserv., vol. 39, no. 6, pp. 3175–3188, 2015, doi: 10.1111/jfpp.12444.
 H. Chen, “Analysis of the acoustic impulse resonance of apples for nondestructive estimation of fruit quality,” Katholieke Univ. Leuven, 1993. [Online]. Available: http://agris.fao.org/agris-search/search.do?recordID=BE9400257
 H. Chen, J. D. Baerdemaeker, and F. Vervaeke, “Acoustic impulse response of apples for monitoring texture changes after harvest,” 1992.
 S. Schotte, N. D. Belie, and J. D. Baerdemaeker, “Acoustic impulse-response technique for evaluation and modelling of firmness of tomato fruit,” Postharvest Biol. Technol., vol. 17, no. 2, pp. 105–115, 1999, doi: 10.1016/S0925-5214(99)00041-1.
 N. Muramatsu, N. Sakurai, R. Yamamoto, and D. J. Nevins, “Nondestructive acoustic measurement of firmness for nectarines, apricots, plums, and tomatoes,” HortScience, vol. 31, no. 7, pp. 1199–1202, 1996.
 B. Diezma-Iglesias, C. Valero, F. J. García-Ramos, and M. Ruiz-Altisent, “Monitoring of firmness evolution of peaches during storage by combining acoustic and impact methods,” J. Food Eng., vol. 77, no. 4, pp. 926–935, 2006, doi: 10.1016/j.jfoodeng.2005.08.021.
 W. Zhang, D. Cui, and Y. Ying, “Nondestructive measurement of pear texture by acoustic vibration method,” Postharvest Biol. Technol., vol. 96, pp. 99–105, 2014, doi: 10.1016/j.postharvbio.2014.05.006.
 F. Khoshnam, S. R. B. H. Beygi, M. Namjoo, and M. Doroozi, “The effect of acoustic system variables on sound signals of Melon varieties,” J. Agric. Mach., 2015.
 F. Khoshnam, M. Namjoo, and H. Golbakhshi, “Acoustic Testing for Melon Fruit Ripeness Evaluation during Diff erent Stages of Ripening,” Agric. Conspec. Sci. Cus, vol. 80, no. 4, pp. 197–204, 2015.
 M. Taniwaki, M. Tohro, and N. Sakurai, “Measurement of ripening speed and determination of the optimum ripeness of melons by a nondestructive acoustic vibration method,” Postharvest Biol. Technol., vol. 56, no. 1, pp. 101–103, 2010, doi: 10.1016/j.postharvbio.2009.11.007.
 J. Mao, Y. Yu, X. Rao, and J. Wang, “Firmness prediction and modeling by optimizing acoustic device for watermelons,” J. Food Eng., vol. 168, pp. 1–6, 2016, doi: 10.1016/j.jfoodeng.2015.07.009.
 A. Haiati, M. H. Raofat, S. Kamgar, and F. Jahani, “Feasability of using electrical capacitance for determining the fruit ripeness of apple,” Iran. J. Biosyst. Eng., vol. 49, no. 2, pp. 195–203, 2018, doi: 10.22059/ijbse.2018.218246.664861.
 J. R. Cooke, “An Interpretation of the Resonant Behavior of Intact Fruits and Vegetables,” Trans. ASAE, vol. 15, no. 6, pp. 1075–1080, 1972, doi: 10.13031/2013.38074.
 ASAE Standards, Compression test of food materials of convex shape. 2008.
 F. Castanedo, “A review of data fusion techniques,” ScientificWorldJournal, vol. 2013, p. 704504, 2013, doi: 10.1155/2013/704504.
 Z. Fathizadeh, M. Aboonajmi, and S. R. Hassan-Beygi, “Design, fabrication and test of integrated acoustic-vibration Fruit Texture Analyzer,” Iran. J. Biosyst. Eng., vol. 51, no. 2, pp. 295–304, 2020, 10.22059/ijbse.2020.286315.665215.
 Z. Fathizadeh, M. Aboonajmi, and S. R. Hassan Beygi, “Classification of apples based on the shelf life using ANN and data fusion,” Food Anal. Methods, vol. 13, no. 12, 2020, doi: 10.1007/s12161-020-01913-1.
 M. Lashgari, A. Imanmehr, and H. Tavakoli, “Fusion of acoustic sensing and deep learning techniques for apple mealiness detection,” J. Food Sci. Technol., Jan. 2020, doi: 10.1007/s13197-020-04259-y.
 H. Li, P. Pidakala, D. Billing, and J. Burdon, “Kiwifruit firmness: Measurement by penetrometer and non-destructive devices,” Postharvest Biol. Technol., vol. 120, pp. 127–137, 2016, doi: 10.1016/j.postharvbio.2016.06.007.
 M. Valente, R. Leardi, G. Self, G. Luciano, and J. P. Pain, “Multivariate calibration of mango firmness using vis/NIR spectroscopy and acoustic impulse method,” J. Food Eng., vol. 94, no. 1, pp. 7–13, Sep. 2009, doi: 10.1016/j.jfoodeng.2009.02.020.