The modulator emits a signal called the carrier.Generally, it is a simple sinusoidal electrical signal of much higher frequency than the modulating signal, according to wp.The modulating signal constitutes the information that is prepared for a transmission (a modem prepares the information to be transmitted, but does not carry out the transmission).The modulator modifies some characteristic of the carrier (which is the action of modulation), so that a signal is obtained, which includes the information of the modulator.Thus the demodulator can recover the original modulating signal, removing the carrier.The characteristics that can be modified of the carrier signal are:amplitude, resulting in amplitude modulation (AM/ASK);frequency, resulting in frequency modulation (FM/FSK);phase, resulting in phase modulation (PM/PSK).A combination of modulations or more complex modulations, such as quadrature amplitude modulation, is also possible.A modem (from the English modem, acronym for modulator demodulator; pl. modems) is a device that converts digital signals into analog (modulation) and vice versa (demodulation), and thus allows communication between computers through the telephone line or the cable modem.It is used to send the modulating signal through another signal called carrier.Modems have been used since the 1960s because direct transmission of intelligible electronic signals over long distances is not efficient;For example, to transmit audio signals over the air, large antennas (on the order of hundreds of meters) would be required for proper reception.It is common to find in many switched network modems the automatic response and dialing facility, which allows them to connect when they receive a call from the PSTN (Public Switched Telephone Network) and proceed to dial any number previously recorded by the user.Thanks to these functions, all communication establishment operations can be performed automatically.GREAT SELECTION OF MULTI-STORE OFFERSWE WANT TO CONTINUE BEING A FREE MEDIAWe are looking for committed people who support usPERIODISTA DIGITAL, SL NIF B82785809 Avenida de Asturias, 49, bajo 28029 Madrid (Spain) Phone (+34) 91 732 19 05 suggestions@periodistadigital.comDIGITAL PERIODISTA, SL CIF B82785809 Avenida de Asturias, 49, bajo 28029 Madrid (Spain) Phone (+34) 91 732 19 05 suggestions@periodistadigital.com