Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A product detector is a type of demodulator used for AM and SSB signals. Rather than converting the envelope of the signal into the decoded waveform like an envelope detector, the product detector takes the product of the modulated signal and a local oscillator, hence the name. A product detector is a frequency mixer. Product detectors can be designed to accept either...
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A product detector is a type of demodulator used for AM and SSB signals. Rather than converting the envelope of the signal into the decoded waveform like an envelope detector, the product detector takes the product of the modulated signal and a local oscillator, hence the name. A product detector is a frequency mixer. Product detectors can be designed to accept either IF or RF frequency inputs. A product detector which accepts an IF signal would be used as a demodulator block in a superheterodyne receiver, and a detector designed for RF can be combined with an RF amplifier and a low-pass filter into a direct-conversion receiver. The simplest form of product detector multiplies an incoming signal by its carrier, to produce a copy of the original message, and another AM signal at twice the original carrier frequency. This high-frequency component can then be filtered out, leaving the original signal.
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Новая книга из серии "Детям об искусстве" познакомит детей и их родителей с искусством фотографии. Автор - известный фотограф Иван Бойко рассказывает о том, почему фотография вот уже полтора века играет такую важную роль в жизни людей всего мира. Читатели узнают, как появилась фотография, познакомятся с известными фотографами и их произведениями. Небольшие тексты, множество фотографий и забавные...
Издательство:
Искусство - XXI век
Дата выхода: декабрь 2018
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