{ "item_title" : "The Origin of Complex Tones. Multiphonic Sounds generated with Wine Glasses and Woodwind Instruments", "item_author" : [" Alexander Rehm "], "item_description" : "Scientific Study from the year 2023 in the subject Physics - Acoustics, language: English, abstract: This study examines if wine glasses can generate multiphonic sounds as a result of a hit with a metal stick on the bowl of the wine glass (hit-excitation). It demonstrates that at least two Eigenfrequenzen (= natural frequencies) of the excited wine glasses with frequencies in Hz of F1 and F2 (with F2) will generate complex tones with frequencies in Hz of F2+F1 and F2-F1 - which is a typical characteristic of multiphonic sounds known from woodwind instruments. Based on the analysis of the decay kinetics of the Eigenfrequenzen and the complex tones after a hit-excitation of the wine glass, the hypothesis has been developed that the oscillations F1 and F2 build a power-profile which can be mathematically described as a multiplication of the amplitude-values of both oscillations and that this power-profile is the driving force to generate oscillations of some areas of the walls of the bowl of the wine glasses with the frequencies F2-F1 and F2+F1.", "item_img_path" : "https://covers2.booksamillion.com/covers/bam/3/34/686/795/3346867951_b.jpg", "price_data" : { "retail_price" : "25.50", "online_price" : "25.50", "our_price" : "25.50", "club_price" : "25.50", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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