在人人皆可成為行動應用程式開發者的世代，傳遞美好的使用者經驗成為設計數位產品時不可或缺的要素。相較於在視覺層面對於使用者介面及資訊架構的琢磨，音效設計一直是互動設計中鮮少被人探索的領域。本研究針對互動音效應用於App之主觀感受進行探索，分析影響使用者經驗之音效構成與設計方式，並進一步評估音效是否影響使用者對於App本身之使用性及整體操作體驗，試圖提供給產品設計師及使用者一個不同以往的思考及新型態的互動方式，創造出嶄新的使用者經驗。

本研究包含兩部分實驗：(1)前導性實驗：透過文獻探討之理論依據進行音效之初步調查與研究測試，釐清音效之功能種類與分類方式，並藉由前導性實驗樣本探勘音效加入的有無對App使用性之差異；(2)驗證實驗：基於前導性實驗之成果，將音效樣本之構成元素拆解，深入探討音效內之細微差異對使用者在使用性及主觀感受上之變化。

驗證實驗採2(音調變化有無) x 3(音色類型)雙因子混合設計方式進行，「音調變化有無」採取兩層級：(1)有音調變化：隨操作事件產生升降階音調變化；(2)無音調變化：操作事件時不產生升降階音調變化。而「音色類型」分為三層級：(1)現實合成音：與現實物件產生對應關係之現實取樣音色；(2)複合數位合成音：與現實物件產生對應之數位合成音色；(3)電子合成音：與現實物件無對應關係之數位合成音色。

研究結果顯示：(1)不論有無樂器學習經驗，在互動音效之辨別與感受上並無顯著性差異，皆認為加入音效後之樣本使用性比無音效更好；(2)複合數位合成音與電子合成音在基礎功能性及提示性評價較好；(3)現實合成音與複合數位合成音在使用性及學習性之表現較為優異；(4)在現實合成音中加入音調變化將降低其使用性評價，反之在複合數位合成音中加入音調變化則會提升其使用性評價；(5)在特定操作任務加入音效，可為使用者帶來多層次的趣味性及成就感，這能讓使用者感到愉悅，並願意持續使用該產品。

In an era that everyone can be a developer of mobile application, delivering a wonderful user experience has become an essential element when designing digital products. Compared to the extensive explorations of the user interface and information architecture in the visual level, the sound design is an area that has remained rarely explored in the interactive design. In this study, the subjective experience of the interactive sound effects applied in the App has been explored in order to analyze the construction and design methods of sound effects that have an impact on the user experience. After that, further evaluation in terms of whether the sound effects affect interface usability and overall operation experience of the App. In th end, it is hoped to provide designers and users with an innovative way of thinking and interacting to create a new user experience.

The experiment in this study consists of two stages: (1) Pre-test: Through the theoretical basis of the literature, the preliminary investigation and research testing of the sound effects have been conducted to clarify the function types and classification methods of sound effects, and further explore the differences in the usability of App by adding the sound effects based on the samples in the pre-test. (2) Verification experiment: Based on the results of pre-test, the constructing elements of sound effect samples have been decomposed in order to thoroughly explore whether the subtle differences in sound effects would have an impact on users’ usability and subjective feelings toward the App.

The verification experiment is conducted on a 3 (with or without tone changes) by 2 (tone types) two-factor mixed design. The tone changes are divided into two levels: (1) With tone changes: The tone has been rising or falling during the operation; (2) Without tone changes: The tone has not been rising or falling during the operation. The tone types are divided into three levels: (1) Auditory Icons: On-site samples in correspondence with actual objects; (2) Compound Earcons: Digitally generated sounds in correspondence with actual objects; (3) Earcons: Digitally generated sounds that have no correspondence with actual objects.

The results show that: (1) There is no significant difference in the recognition and feeling of the interactive sound effects whether the user has learned to play a musical instrument or not; they all suggest that the samples with sound effects are better than the ones with no sound effects; (2) Compound earcons and earcons have better evaluations in the indication and usability of basic functions. (3) Auditory icons and compound earcons have better performances in being easy to use and learn; (4) The addition of tone changes in auditory icons would lower the evaluation of usability, whereas the addition of tone changes in compound earcons would improve the evaluation of usability; (5) The addition of sound effects to a specific operation task can bring multi-level feelings of enjoyment and accomplishment to users, which would make them feel amused and willing to continue to use the product.

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