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audioThis article is about compression waves. For other meanings, see sound (disambiguation).Sound is a disturbance of mechanical energy that propagates through matter as a wave. Sound is characterized by the properties of sound waves which are frequency, wavelength, period, amplitude and velocity or speed. ExplanationNoise and sound often mean the same thing; when they differ, a noise is an unwanted sound. The leading professional association worldwide for professionals involved in the Humans perceive sound by the sense of hearing. By sound, we commonly mean the vibrations that travel through air and can be heard by humans. However, scientists and engineers use a wider definition of sound that includes low and high frequency vibrations in air that cannot be heard by humans, and vibrations that travel through all forms of matter, gases, liquids and solids. The matter that supports the sound is called the medium. Satellitare o GPS • itcomphardwareschede-audio : Le schede audio per PC • itcomphardwarescsi : Periferiche SCSI • itcomphardwarestorage : Dispositivi per laM-AUDIO. Sound propagates as waves of alternating pressure, causing local regions of compression and rarefaction. Particles in the medium are displaced by the wave and oscillate. The scientific study of sound is called acoustics. Perception of soundA schematic representation of hearing. (Blue: sound waves. Audio Bible Online. Red: eardrum. Yellow: cochlea. Green: auditory receptor cells. Purple: frequency spectrum of hearing response. Home Download mp3 su cellulari Concorso per diventare registi col telefonino Sotto inchiesta la vendita di dati su telefonate cellulari in Usa Cellulari super-veloci Un dispositivo per unire lettori multimediali e cellulari Infostrada TuttoIncluso Ora la TV è sul Web Numero unico per cellulare Navigare liberamente fino a 60 ore al mese anche col cellulare In comune l’ADSL economica Partnership tra Vodafone e Sony NetServices Mini-cellulare per gli appassionati di email Manuale Alcatel OT 155 30 minuti a 1 euro da Tim 2 nuovi cellulari con Tv digitale per Pantech Cellulari contro cinema Palmare RIM BlackBerry 7730 Tele2 nuovo Marketing and Sales Director Servizio musicale su abbonamento da Motorola Navigatore Mitac Mio268 Plus Navigatore satellitare Mitac Mio269 Plus Philips aumenta la sua quota in TLC 2006 Febbraio 09 2006 Febbraio 23 Nuovo Nokia 6136 Motorola C289 Nuovo LG M6100 Ericsson denuncia Samsung Con TIM parli in mare aperto UMTS Samsung dotato di tecnologia Edge Videofonino Motorola A925i Buone notizie su sblocco Sim Lock Scontro legale tra 3 e associazioni consumatori Telefonica taglia a metà prezzi sms e mms Palmare Casio Cassiopeia BE-300 Cellulari verso un miliardo all’anno Philips 960 Music Phone Accordo BlackBerry per i nuovi cellulari Sony Ericsson Palmare con funzionalità telefoniche iPAQ hw6510 Col cellulare si aiutano i poveri I-Mate presenta un nuovo smartphone Tim un super Umts per lanciare la TV Digitale Palmare i-Mate SP3i Motorola con Windows Media Audio |