Pic ialah ciri persepsi yang membolehkan aturan bunyi mengikut skala berasaskan frekuensi.[1] Pic dikatakan "tinggi" atau "rendah" mengikut makna yang dikaitkan dengan melodi,[2] yang memerlukan bunyi yang frekuensinya jelas dan stabil agar dapat dibezakan daripada bunyi bising atau hingar.[3] Pic merupakan atribut auditori utama ton muzik bersama-sama tempoh, kenyaringan dan timbre.[4]
Pic dapat diukur sebagai frekuensi, akan tetapi pic bukanlah ciri fizikal objektif semata-mata. Pic juga atribut Psychoacoustic subjektif sesuatu bunyi. Dari segi sejarah, kajian pic dan persepsi pic merupakan masalah utama dalam bidang psychocoustics, dan menjadi pendorong utama dalam pembentukan dan pengujian teori-teori berkaitan dengan perwakilan bunyi, pemprosesan, dan pengamatan dalam sistem auditori.[5]
For the purposes of this book we decided to take a conservative approach, and to focus on the relationship between pitch and musical melodies. Following the earlier ASA definition, we define pitch as 'that attribute of sensation whose variation is associated with musical melodies.' Although some might find this too restrictive, an advantage of this definition is that it provides a clear procedure for testing whether or not a stimulus evokes a pitch, and a clear limitation on the range of stimuli that we need to consider in our discussions.Unknown parameter
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Melody: In the most general case, a coherent succession of pitches. Here pitch means a stretch of sound whose frequency is clear and stable enough to be heard as not noise; succession means that several pitches occur; and coherent means that the succession of pitches is accepted as belonging together.