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What is difference between modulator and demodulator?
Modulation is used when information is available in analog form that varies the frequency and/or amplitude of a lower frequency wave, depending on the information it carries. The role of modulation is to place this information onto a carrier frequency that can be transmitted more readily and with least loss of information. There are three fundamental types of modulation - frequency modulation, amplitude modulation and phase modulation. In each of these, a carrier frequency is modulated by a lower frequency, to form a modulated carrier wave. A modulator modulates the carrier frequency, while a demodulator detects the modulation on the carrier wave and recovers the original lower frequency waveform at the destination. For many years the modulated carrier wave was converted to a radio signal. Now it is often an electrical signal which is sent down a teleohone line; the information is usually a set of pulses going between computers. When computers are connected to each other in a two-way conversation, the MOdulator and DEModulator are combined into a single device called a MODEM.
FM is better than AM?
FM is frequency modulation. The amplitude is held constant and the carrier frequency is varied. AM is amplitude modulation. The amplitude is varied and the carrier frequency is held constant.
How many pages are in the 2005 NEC Code Book?
The paperback version of the 2005 NEC code book has 792 pages. It is written by the National Fire Protection Agency. It is the standart for electrical and wiring regulations.
How many amp service do new homes have?
There are too many variables to really answer that question. I've seen new residential (120/240 volt, single phase) services installed ranging from 100 Amps to 400 Amps. Depends on the home. Your local electrical code should provide some guidance as to what is the minimum size. If planning a home your electrician can help decide if the minimum required by code is sufficient or if you need to go larger. IanS
How many amps is 12-2 romex safe for?
It is rated at 20 amps. Code states that conductors should only be loaded to 80% so continuous load will be 20 x .8 = 16amps
What is ppm modulation?
pulse position modulation, used in many RC model aircraft controls.
How many type of modulation?
17
Why do you use modulation?
MODULATION is a media for transferring information it can come in many forms FM ,AM, PULSES, PAM and so forth.
Why phase modulation is used?
Actually phase modulation was used for the color signal in all analog TV systems.Phase modulation, with some signal preprocessing, was used to indirectly get frequency modulation in many FM transmitters.Certain modems use phase amplitude modulation.etc.
How do you receive digital signals?
The carrier waves are electromagnetic in nature, and it is the modulation of them that carries the information. There are several methods of modulation, FM, AM, Pulse-code, and many more. The digital signals are modulated on the carrier wave. And digital signals should theoretically be more immune to interference than analog ones.
Why phase modulation is least used?
Actually phase modulation was used for the color signal in all analog TV systems.Phase modulation, with some signal preprocessing, was used to indirectly get frequency modulation in many FM transmitters.Certain modems use phase amplitude modulation.etc.
How many TV channels are there in Canada?
about 50 channels
Why modualtion is need?
Without modulation, there's be no way to get any information onto a carrier signal. There are several different types of modulation schemes for radio carriers and almost as many different types demodulators to decode the information so that it can be converted into a usable form. For instance, AM (amplitude modulation), FM (frequency modulation), digital modulation, quadrature amplitude, etc.
How many channels does dish network have?
Dish Network satellite TV has hundreds of channels--many of them in HD. They also have many international channels from across the globe.
What audio file format does NOT use compression to reduce file size?
Wave, AIFF SND and many other formats are not compressed. Most of these are variations of a PCM (pulse code modulation) format.
How many English news channels in India?
how many news channels in India
How many media channels in Pakistan?
149 channels are in Pakistan
