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Date: 2023-11-30
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Date: 2023-08-15
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Date: 2023-12-05
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period (n.)
A term derived from the study of the physics of sound, and used in ACOUSTIC PHONETICS, referring to the time it takes for a CYCLE of pressure variation in a sound wave to repeat itself. The shorter the period, the more cycles there will be in a given unit of time, and thus the higher the FREQUENCY. Waveforms which show a repeating pattern of vibration are periodic waves; those which do not are aperiodic. Speech makes use of both types of waveform: VOWEL sounds have periodic waveforms; FRICATIVES, for example, involve aperiodic waveforms.
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دراسة يابانية لتقليل مخاطر أمراض المواليد منخفضي الوزن
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اكتشاف أكبر مرجان في العالم قبالة سواحل جزر سليمان
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اتحاد كليات الطب الملكية البريطانية يشيد بالمستوى العلمي لطلبة جامعة العميد وبيئتها التعليمية
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