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  Modulation Natures

Introduction to Modulation Natures

PERCENTAGE OF MODULATION

The power of audio signal at the receiver relies on the depth of signal wave. The depth of modulation described in terms of percentage in termed as percentage of modulation. It is the radio among signal voltage and the carrier voltage.

Percentage of Modulation = (Signal Voltage/Carrier Voltage) X 100

MODULATION INDEX

The depth of modulation relies on the frequency deviation in frequency modulation. According to this way, the depth of frequency modulation is termed as modulation index. It is also termed as modulation factor.

Modulation index = Frequency deviation/Signal frequency

MODEM

Modem abbreviated word for modulator - demodulator is an electronic device which converts digital signals of computer into particular frequencies to travel over telephone or cable television lines. At the end the receiving modem demodulates the frequencies again in to digital data. To communicate with each other over a network, the computers employ modems.

The modem has considerably developed ever since the 1970s while the 300 baud modem was employed for connecting computers to BBSs (bulletin board systems).

When, the 300 baud modem can transmit about 30 characters per second. People were rapidly sharing graphics and programs.

The title asymmetric basically means that the modem is faster at downloading that means getting data, than uploading means sending data.

The ADSL modem has important, immediate benefits over the dial-up modem. ADSL service is an "always on" connection type; the ADSL modem is very much quicker than a dialup modem.

Several businesses need to upload large files or programs to the internet and download (getting data) large files. One would require a symmetric DSL (SDSL) account for equal bandwidth in both directions.

So far other type of modem uses cable TV wiring than the phone line to give internet connectivity. A cable modem needs service from a cable TV provider for internet connectivity.

A less general modem is a satellite modem or also known as sat modem. This modem converts digital data into radio waves to communicate along with a satellite dish. But the service is very much costly than more conventional sorts of internet connectivity. A satellite modem can be a choice for businesses or cable service offerings.

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