What is the function of modulator

Modulator is a device for signal transmission. It can modulate low-frequency signals (such as audio, video, data, etc.) into high-frequency signals. It can load the information of low-frequency signals into the amplitude of high-frequency signals. ;Can load the information of low-frequency signal to the frequency of high-frequency signal. Modulators are generally used in pairs with demodulators. The modulator is used to process digital signals into high-frequency signals for transmission, while the demodulator restores the digital signals to the original signals.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

Modulator refers to a device that uses digital signal processing technology to modulate low-frequency digital signals (such as audio, video, data, etc.) into high-frequency digital signals for signal transmission.

The function of the modulator:

• Can load low-frequency signals (such as audio, video, data, etc.) to high-frequency signals

• You can load the information of the low-frequency signal into the amplitude of the high-frequency signal

• ##You can load the information of the low-frequency signal into the frequency of the high-frequency signal

Modulators are widely used in the transmission of information such as broadcasting (audio signals) and television (video signals). Modulators are generally used in pairs with demodulators. The modulator is used to process digital signals into high-frequency signals for transmission, while the demodulator restores the digital signals to the original signals.

Its function is to combine the video signal (VIDEO) provided by the signal source (which can be a digital TV set-top box, satellite digital TV receiver, DVD player, computer, camera, TV demodulator and other AV signal sources) and The audio signal (AUDIO) is modulated into a stable high-frequency radio frequency oscillation signal, the video is amplitude modulation modulation, and the audio is frequency modulation modulation.

Features

1. The modulator adopts PAL-D standard adjacent frequency modulation method for fixed channel output in the 48MHz-750MHz frequency band.

2. The circuit design adopts the idea of ​​image frequency and audio frequency CPU dual phase-locked loop (PLL) design.

3. Use imported high-quality broadcast-grade modulation chips (TOSHIBA, MOTOROAL, INTECH, TEXAS INSTRUMENTS, FAIRCHILD and other companies) on the device.

4. Using high-performance surface acoustic wave (SAW) filtering, the residual sideband suppression is greater than 65dB.

5. 110 dBuv RF output, stable level amplitude and accurate frequency.

6. Unique filtering method, out-of-band output suppression is greater than 65dB.

7. Image modulation degree, audio frequency offset, A/V ratio, and RF output level are all adjustable.

8. 19-inch standard chassis design, standardized installation.

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