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Definition of "Audio-Frequency-Tone Shift" |
A system that uses amplitude modulation to change dc mark and space impulses into audio impulses. / Audio-Frequency-Tone Shift system use amplitude modulation to change dc mark and space impulses into audio electrical impulses. / Duct are used in heating, ventilation, and air conditioning to deliver and remove air. These needed airflows include, for example, supply air, return air, and exhaust air. Ducts also deliver, most commonly as part of the supply air, ventilation air. As such, air ducts are one method of ensuring acceptable indoor air quality as well as thermal comfort. |
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