Question

Для чего служит модулятор в передающем устройстве?

Answer 1

При передаче сигналов с помощью радиоволн на высокочастотное излучение (называется несущая частота) накладывается полезный сигнал низкой частоты. При этом либо амплитуда суммарного сигнала (при амплитудной модуляции) либо частота суммарного сигнала (при частотной модуляции) изменяется пропорционально амплитуде полезного сигнала. Так вот эту операцию наложения и выполняет модулятор в передатчике.

 

В приемнике такой сигнал отлавливается и из него с успехом выделяется полезный синал для последующего использования.

Answer 2

The Role of a Modulator in a Transmitter

A modulator is an essential component in a transmitting device that serves the purpose of converting the baseband signal into a form suitable for transmission over a communication channel. It prepares the signal for efficient transmission and ensures that it can be properly received and demodulated by the receiving device.

The main function of a modulator in a transmitting device is to:

1. Convert the baseband signal: The modulator takes the baseband signal, which is typically in the form of an analog or digital signal, and transforms it into a modulated signal that can be transmitted over a communication channel.

2. Enable efficient transmission: The modulator modifies the baseband signal by adding it to a carrier signal, which increases the frequency of the signal and allows it to be transmitted over long distances without significant loss or degradation.

3. Provide signal integrity: The modulator ensures that the modulated signal is robust and resistant to noise and interference during transmission. It employs various modulation techniques, such as amplitude modulation (AM), frequency modulation (FM), or phase modulation (PM), to encode the baseband signal onto the carrier signal.

4. Facilitate signal demodulation: The modulator prepares the signal for demodulation at the receiving end. By modulating the baseband signal onto a carrier signal, it allows the receiver to extract the original information from the received signal using a demodulator.

In summary, the modulator plays a crucial role in a transmitting device by converting the baseband signal into a modulated signal suitable for transmission over a communication channel. It ensures efficient transmission, signal integrity, and facilitates demodulation at the receiving end.

I hope this explanation helps! Let me know if you have any further questions.