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Date: 2023-09-27
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Date: 2023-07-22
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Date: 19-5-2022
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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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"عادة ليلية" قد تكون المفتاح للوقاية من الخرف
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ممتص الصدمات: طريقة عمله وأهميته وأبرز علامات تلفه
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المجمع العلمي للقرآن الكريم يقيم جلسة حوارية لطلبة جامعة الكوفة
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