Digital Amplitude Modulation and Digital Frequency Modulation | Soukacatv.com

Though based on the same concepts, digital modulation waveforms look quite different from their analog counterparts.

Though far from extinct, analog modulation is simply incompatible with a digital world. We no longer focus our efforts on moving analog waveforms from one place to another. Rather, we want to move data: wireless networking, digitized audio signals, sensor measurements, and so forth. To transfer digital data, we use digital modulation.

We have to be careful, though, with this terminology. “Analog” and “digital” in this context refer to the type of information being transferred, not to the basic characteristics of the actual transmitted waveforms. Both analog and digital modulation use smoothly varying signals; the difference is that an analog-modulated signal is demodulated into an analog baseband waveform, whereas a digitally modulated signal consists of discrete modulation units, called symbols, that are interpreted as digital data.

There are analog and digital versions of the three modulation types. Let’s start with amplitude and frequency.
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Digital Amplitude Modulation

This type of modulation is referred to as amplitude shift keying (ASK). The most basic case is “on-off keying” (OOK), and it corresponds almost directly to the mathematical relationship discussed in the page dedicated to analog amplitude modulation: If we use a digital signal as the baseband waveform, multiplying the baseband and the carrier results in a modulated waveform that is normal for logic high and “off” for logic low. The logic-high amplitude corresponds to the modulation index.

Time Domain

The following plot shows OOK generated using a 10 MHz carrier and a 1 MHz digital clock signal. We’re operating in the mathematical realm here, so the logic-high amplitude (and the carrier amplitude) is simply dimensionless “1”; in a real circuit you might have a 1 V carrier waveform and a 3.3 V logic signal.

You may have noticed one inconsistency between this example and the mathematical relationship discussed in the [[Amplitude Modulation]] page: we didn’t shift the baseband signal. If you’re dealing with a typical DC-coupled digital waveform, no upward shifting is necessary because the signal remains in the positive portion of the y-axis.

 Frequency Domain

Here is the corresponding spectrum:

Compare this to the spectrum for amplitude modulation with a 1 MHz sine wave:

Most of the spectrum is the same—a spike at the carrier frequency (f_C) and a spike at f_C plus the baseband frequency and f_C minus the baseband frequency. However, the ASK spectrum also has smaller spikes that correspond to the 3rd and 5th harmonics: The fundamental frequency (f_F) is 1 MHz, which means that the 3rd harmonic (f₃) is 3 MHz and the 5th harmonic (f₅) is 5 MHz. So we have spikes at f_C plus/minus f_F, f₃, and f₅. And actually, if you were to expand the plot, you would see that the spikes continue according to this pattern.

This makes perfect sense. A Fourier transform of a square wave consists of a sine wave at the fundamental frequency along with decreasing-amplitude sine waves at the odd harmonics, and this harmonic content is what we see in the spectrum shown above.

This discussion leads us to an important practical point: abrupt transitions associated with digital modulation schemes produce (undesirable) higher-frequency content. We have to keep this in mind when we consider the actual bandwidth of the modulated signal and the presence of frequencies that could interfere with other devices.

 Digital Frequency Modulation

This type of modulation is called frequency shift keying (FSK). For our purposes it is not necessary to consider a mathematical expression of FSK; rather, we can simply specify that we will have frequency f₁ when the baseband data is logic 0 and frequency f₂ when the baseband data is logic 1.

 Time Domain

One method of generating the ready-for-transmission FSK waveform is to first create an analog baseband signal that switches between f₁ and f₂ according to the digital data. Here is an example of an FSK baseband waveform with f₁ = 1 kHz and f₂ = 3 kHz. To ensure that a symbol is the same duration for logic 0 and logic 1, we use one 1 kHz cycle and three 3 kHz cycles.

 The baseband waveform is then shifted (using a mixer) up to the carrier frequency and transmitted. This approach is particularly handy in software-defined-radio systems: the analog baseband waveform is a low-frequency signal, and thus it can be generated mathematically then introduced into the analog realm by a DAC. Using a DAC to create the high-frequency transmitted signal would be much more difficult.

A more conceptually straightforward way to implement FSK is to simply have two carrier signals with different frequencies (f₁ and f₂); one or the other is routed to the output depending on the logic level of the binary data. This results in a final transmitted waveform that switches abruptly between two frequencies, much like the baseband FSK waveform above except that the difference between the two frequencies is much smaller in relation to the average frequency. In other words, if you were looking at a time-domain plot, it would be difficult to visually differentiate the f₁ sections from the f₂ sections because the difference between f₁ and f₂ is only a tiny fraction of f₁ (or f₂).

 Frequency Domain

Let’s look at the effects of FSK in the frequency domain. We’ll use our same 10 MHz carrier frequency (or average carrier frequency in this case), and we’ll use ±1 MHz as the deviation. (This is unrealistic, but convenient for our current purposes.) So the transmitted signal will be 9 MHz for logic 0 and 11 MHz for logic 1. Here is the spectrum:

 Note that there is no energy at the “carrier frequency.” This is not surprising, considering that the modulated signal is never at 10 MHz. It is always at either 10 MHz minus 1 MHz or 10 MHz plus 1 MHz, and this is precisely where we see the two dominant spikes: 9 MHz and 11 MHz.

But what about the other frequencies present in this spectrum? Well, FSK spectral analysis is not particularly straightforward. We know that there will be additional Fourier energy associated with the abrupt transitions between frequencies. It turns out that FSK results in a sinc-function type of spectrum for each frequency, i.e., one is centered on f₁ and the other is centered on f₂. These account for the additional frequency spikes seen on either side of the two dominant spikes.

 Summary

• Digital amplitude modulation involves varying the amplitude of a carrier wave in discrete sections according to binary data.
• The most straightforward approach to digital amplitude modulation is on-off keying.
• With digital frequency modulation, the frequency of a carrier or a baseband signal is varied in discrete sections according to binary data.
• If we compare digital modulation to analog modulation, we see that the abrupt transitions created by digital modulation result in additional energy at frequencies farther from the carrier.

Established in 2000, the Soukacatv.com (DSW) main products are modulators both in digital and analog modulators, amplifier and combiner. We are the leading communication supplier in manufacturing the headend system in China. Our 16 in 1 and 24 in 1 now are the most popular products all over the world. For more, please access to https://www.soukacatv.com/.

Source: allaboutcircuits

Brief Introduction about the Definition and Characteristics of Digital Signal | Soukacatv.com

A digital signal refers to an electrical signal that is converted into a pattern of bits. Unlike an analog signal, which is a continuous signal that contains time-varying quantities, a digital signal has a discrete value at each sampling point. The precision of the signal is determined by how many samples are recorded per unit of time. For example, the illustration below shows an analog pattern (represented as the curve) alongside a digital pattern (represented as the discrete lines).

A digital signal is easily represented by a computer because each sample can be defined with a series of bits that are either in the state 1 (on) or 0 (off). Digital signals can be compressed and can include additional information for error correction.

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Characteristics of Digital Signals 
1. Bit interval
It is the time required to send one single bit

2. Bit rate
(i) It refers to the number of bit intervals in one second.
(ii) Therefore bit rate is the number of bits sent in one second as shown in fig.
(iii)Bit rate is expressed in bits per second (bps).
(iv)Other units used to express bit rate are Kbps, Mbps and Gbps.
             1 kilobit per second (Kbps) = 1,000 bits per second
             1 Megabit per second (Mbps) = 1,000,000 bits per second
             1 Gigabit per second (Gbps) = 1,000,000,000 bits per second

Advantages of Digital Signals
Digital Data - Digital transmission certainly has the advantage where binary computer data is being transmitted. The equipment required to convert digital data to analog format and transmitting the digital bit streams over an analog network can be expensive, susceptible to failure, and can create errors in the information.
Compression - Digital data can be compressed relatively easily, thereby increasing the efficiency of transmission. As a result, substantial volumes of voice, data, video and image information can be transmitted using relatively little raw bandwidth.

Security - Digital systems offer better security. While analog systems offer some measure of security through the scrambling of several frequencies. Scrambling is fairly simple to defeat. Digital information, on the other hand, can be encrypted to create the appearance of a single, pseudorandom bit stream. Thereby, the true meaning of individual bits, sets of bits, or the total bit stream cannot be determined without having the key to unlock the encryption algorithm employed.

Quality - Digital transmission offers improved error performance (quality) as compared to analog. This is due to the devices that boost the signal at periodic intervals in the transmission system in order to overcome the effects of attenuation. Additionally, digital networks deal more effectively with noise, which always is present in transmission networks.

Cost - The cost of the computer components required in digital conversion and transmission has dropped considerably, while the ruggedness and reliability of those components has increased over the years.

Upgradeability - Since digital networks are comprised of computer (digital) components, they are relatively easy to upgrade. Such upgrading can increase bandwidth, reduces the incidence of error and enhance functional value. Some upgrading can be effected remotely over a network, eliminating the need to dispatch expensive technicians for that purpose.

Management - Generally speaking, digital networks can be managed much more easily and effectively due to the fact that such networks consist of computerized components. Such components can sense their own level of performance, isolate and diagnose failures, initiate alarms, respond to queries, and respond to commands to correct any failure. Further, the cost of these components continues to drop.

Established in 2000, the Soukacatv.com (DSW) main products are modulators both in digital and analog modulators, amplifier and combiner. We are the leading communication supplier in manufacturing the headend system in China. Our 16 in 1 and 24 in 1 now are the most popular products all over the world. For more, please access to https://www.soukacatv.com/.

Source: ecomputernotes

Reading About the Analog vs. Digital Signals | Soukacatv.com

Overview

We live in an analog world. There are an infinite amount of colors to paint an object (even if the difference is indiscernible to our eye), there are an infinite number of tones we can hear, and there are an infinite number of smells we can smell. The common theme among all of these analog signals is their infinite possibilities.

Digital signals and objects deal in the realm of the discrete or finite, meaning there is a limited set of values they can be. That could mean just two total possible values, 255, 4,294,967,296, or anything as long as it’s not ∞ (infinity).

Working with electronics means dealing with both analog and digital signals, inputs and outputs. Our electronics projects have to interact with the real, analog world in some way, but most of our microprocessors, computers, and logic units are purely digital components. These two types of signals are like different electronic languages; some electronics components are bi-lingual, others can only understand and speak one of the two.

In this tutorial, we’ll cover the basics of both digital and analog signals, including examples of each. We’ll also talk about analog and digital circuits, and components.

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Suggested Reading

The concepts of analog and digital stand on their own, and don’t require a lot of previous electronics knowledge. That said, if you haven’t already, you should peek through some of these tutorials:

• Voltage, Current, Resistance and Ohm’s Law

• What is a Circuit

• And some mathematics concepts: reading graphs, and understanding the difference between finite and infinite sets.

Analog Signals

Define: Signals

Before going too much further, we should talk a bit about what a signal actually is, electronic signals specifically (as opposed to traffic signals, albums by the ultimate power-trio, or a general means for communication). The signals we’re talking about are time-varying “quantities” which convey some sort of information. In electrical engineering the quantity that’s time-varying is usually voltage (if not that, then usually current). So when we talk about signals, just think of them as a voltage that’s changing over time.

Signals are passed between devices in order to send and receive information, which might be video, audio, or some sort of encoded data. Usually the signals are transmitted through wires, but they could also pass through the air via radio frequency (RF) waves. Audio signals, for example might be transferred between your computer’s audio card and speakers, while data signals might be passed through the air between a tablet and a WiFi router.

Analog Signal Graphs

Because a signal varies over time, it’s helpful to plot it on a graph where time is plotted on the horizontal, x-axis, and voltage on the vertical, y-axis. Looking at a graph of a signal is usually the easiest way to identify if it’s analog or digital; a time-versus-voltage graph of an analog signal should be smooth and continuous.

While these signals may be limited to a range of maximum and minimum values, there are still an infinite number of possible values within that range. For example, the analog voltage coming out of your wall socket might be clamped between -120V and +120V, but, as you increase the resolution more and more, you discover an infinite number of values that the signal can actually be (like 64.4V, 64.42V, 64.424V, and infinite, increasingly precise values).

Example Analog Signals

Video and audio transmissions are often transferred or recorded using analog signals. The composite video coming out of an old RCA jack, for example, is a coded analog signal usually ranging between 0 and 1.073V. Tiny changes in the signal have a huge effect on the color or location of the video.

An analog signal representing one line of composite video data.

Pure audio signals are also analog. The signal that comes out of a microphone is full of analog frequencies and harmonics, which combine to make beautiful music.

Digital Signals

Digital signals must have a finite set of possible values. The number of values in the set can be anywhere between two and a-very-large-number-that’s-not-infinity. Most commonly digital signals will be one of two values – like either 0V or 5V. Timing graphs of these signals look like square waves.

Or a digital signal might be a discrete representation of an analog waveform. Viewed from afar, the wave function below may seem smooth and analog, but when you look closely there are tiny discrete steps as the signal tries to approximate values:

That’s the big difference between analog and digital waves. Analog waves are smooth and continuous, digital waves are stepping, square, and discrete.

Example Digital Signals

Not all audio and video signals are analog. Standardized signals like HDMI for video (and audio) and MIDI, I2S, or AC'97for audio are all digitally transmitted.

Most communication between integrated circuits is digital. Interfaces like serial, I2C, and SPI all transmit data via a coded sequence of square waves.

Serial peripheral interface (SPI) uses many digital signals to transmit data between devices.

Analog and Digital Circuits

Analog Electronics

Most of the fundamental electronic components – resistors, capacitors, inductors, diodes, transistors, and operational amplifiers – are all inherently analog. Circuits built with a combination of solely these components are usually analog.

Analog circuits are usually complex combinations of op amps, resistors, caps, and other foundational electronic components. This is an example of a class B analog audio amplifier.

Analog circuits can be very elegant designs with many components, or they can be very simple, like two resistors combining to make a voltage divider. In general, though, analog circuits are much more difficult to design than those which accomplish the same task digitally. It takes a special kind of analog circuit wizard to design an analog radio receiver, or an analog battery charger; digital components exist to make those designs much simpler.

Analog circuits are usually much more susceptible to noise (small, undesired variations in voltage). Small changes in the voltage level of an analog signal may produce significant errors when being processed.

Digital Electronics

Digital circuits operate using digital, discrete signals. These circuits are usually made of a combination of transistors and logic gates and, at higher levels, microcontrollers or other computing chips. Most processors, whether they’re big beefy processors in your computer, or tiny little microcontrollers, operate in the digital realm.

Digital circuits make use of components like logic gates, or more complicated digital ICs (usually represented by rectangles with labeled pins extending from them).

Digital circuits usually use a binary scheme for digital signaling. These systems assign two different voltages as two different logic levels – a high voltage (usually 5V, 3.3V, or 1.8V) represents one value and a low voltage (usually 0V) represents the other.

Although digital circuits are generally easier to design, they do tend to be a bit more expensive than an equally tasked analog circuit.

Analog and Digital Combined

It’s not rare to see a mixture of analog and digital components in a circuit. Although microcontrollers are usually digital beasts, they often have internal circuitry which enables them to interface with analog circuitry (analog-to-digital converters, pulse-width modulation, and digital-to-analog converters. An analog-to-digital converter (ADC) allows a microcontroller to connect to an analog sensor (like photocells or temperature sensors), to read in an analog voltage. The less common digital-to-analog converter allows a microcontroller to produce analog voltages, which is handy when it needs to make sound.

Resources and Going Further

Now that you know the difference between analog and digital signals, we’d suggest checking out the Analog to Digital Conversion tutorial. Working with microcontrollers, or really any logic-based electronics, means working in the digital realm most of the time. If you want to sense light, temperature, or interface a microcontroller with a variety of other analog sensors, you’ll need to know how to convert the analog voltage they produce into a digital value.

Also, consider reading our Pulse Width Modulation (PWM) tutorial. PWM is a trick microcontrollers can use to make a digital signal appear to be analog.

Here are some other subjects which deal heavily with digital interfaces:

• Binary

• Logic Levels

• Serial Communication

• SPI Communication

• I2C Communication

• IR Communication

Or, if you’d like to delve further into the analog realm, consider checking out these tutorials:

• Voltage Dividers

• Resistors

• Diodes

• Capacitors

• Transistors

Established in 2000, the Soukacatv.com (DSW) main products are modulators both in digital and analog modulators, amplifier and combiner. We are the leading communication supplier in manufacturing the headend system in China. Our 16 in 1 and 24 in 1 now are the most popular products all over the world. For more, please access to https://www.soukacatv.com/.

Source: learn.sparkfun

What is Modulation? Why Do We Need it? | Soukacatv.com

What is Modulation?

Transmission of information by communication systems over large distances is quite a feat of human ingenuity. We can talk, video chat and text anyone on this planet! Communication system uses a very clever technique called Modulation to increase the reach of the signals. Two signals are involved in this process.

Message signals also known as baseband signals are the band of frequencies representing the original signal. This is the signal to be transmitted to the receiver. Frequency of such a signal is usually low. The other signal involved with this is a high frequency sinusoidal wave. This signal is called the carrier signal. The frequency of carrier signals is almost always higher than that of the baseband signal. The amplitude of the baseband signal is transferred to the high frequency carrier. Such a higher frequency carrier is able to travel much farther than the baseband signal.

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But that’s not the only advantage of modulation. What is the need for modulation?

1. Size of the Antennae
When the transmission occurs over free space, the antennae radiate the signal out and receiver receives it. In order to operate efficiently, antennae need to be in order of the magnitude of wavelength of the transmitted signal.
L=λ=uϑ=(3∗108)ϑHz
Speech frequencies range from 20 Hz to 20 kHz. Suppose this is a frequency of 20 kHz and it is radiated out to a receiver through a channel of free space.
Length of Antennae=3∗10820∗103=15000m=15km
It is impossible to build an antennae this big. Instead say we give modulation a chance and use a 1000 kHz carrier wave to carry the signal. Length of the antennae now would be;
Length of Antennae=3∗1081000∗103=300m
This is much more doable and this example clearly shows us how hugely the process of modulation is enabling communication systems.

2. Wireless Communication
By using modulation to transmit the signals through space to long distances, we have removed the need for wires in communication systems. The technique of modulation helped humans to become wireless. Telephones no longer had to be plugged to a wall. Using a mobile phone went from a dream to the next big thing.

3. Interference from other signals
This is a point from the practical side of things. Suppose you are transmitting the baseband signal to a receiver, say your friends phone. Just like you there will be thousands of people in the city using their mobile phones. There is no way to tell such signals apart and they will interfere with each other leading to a lot of noise in the system and a very bad output. By using a carrier wave of high frequencies and allotting a band of frequencies to each message, there is no mixing up of signals and the received signals are absolutely perfect.

There are three types of Modulation:
• Amplitude Modulation
• Frequency Modulation
• Phase Modulation

Established in 2000, the Soukacatv.com (DSW) main products are modulators both in digital and analog modulators, amplifier and combiner. We are the leading communication supplier in manufacturing the headend system in China. Our 16 in 1 and 24 in 1 now are the most popular products all over the world. For more, please access to https://www.soukacatv.com/.

Source：byjus

Key difference between modulation and demodulation | Soukacatv.com

The key difference between modulation and demodulation is that modulation is to transfer the message signal by adding it with the carrier signal while demodulation is the process of filtering out the actual message signal from the carrier signal.

In general, radio carrier generates at the transmission side of a telecommunication link.  In transmission, it is necessary to send a signal a long distance. Usually, a high-frequency signal is capable of traveling a long distance. Therefore, the message signal or the information signal combines with a high-frequency signal called the carrier signal without affecting its original characteristics.  This process of combining the message signal with the carrier signal is called the modulation. The demodulation process occurs at the receiving end.

CONTENTS

1. Overview and Key Difference
2. What is Modulation
3. What is Demodulation
4. Side by Side Comparison – Modulation vs Demodulation in Tabular Form
5. Summary

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What is Modulation?

Modulation is the process of putting the information that we need to transfer into a carrier signal. IEEE defines modulation as “a process whereby certain characteristics of a wave, often called the carrier, are varied or selected in accordance with a modulation function.”

There are various types of modulation. In Amplitude Modulation (AM) the amplitude of the carrier signal varies according to the amplitude of the message signal. Frequency Modulation (FM) changes the carrier signal frequency according to the message signal. Phase Modulation (PM) changes the carrier phase according to the message signal.

Figure 01: Communication System

Digital Modulation converts the analog signals to digital forms of 1s and 0s. There are various digital modulation techniques. Amplitude Shift Keying (ASK) represents the binary data in the form of variations in the amplitude of a signal. Frequency Shift Keying (FSK) changes the frequency of the carrier signal according to the discrete digital changes.  Phase Shift Keying (PSK) changes the phase of the carrier signal by varying the sine and cosine inputs at a particular time.

Modulation of a sine waveform allows to transform a baseband message signal into a passband signal; for example, low-frequency audio signal into a radio-frequency signal (RF signal). In radio broadcasting and voice communication, this concept is highly utilized to shift baseband voice signal into a passband channel.

What is Demodulation?

Demodulation is the process of extracting an information signal from the carrier signal. Demodulation process should be exactly compatible with the modulation method otherwise, the destination end will not be able to extract the original information signal from the carrier signal. Therefore, the initial handshake should take place in a proper mechanism to negotiate the modulation and demodulation methods in advance, for a dynamic environment.

For an example, in mobile communications, modulation methods could change on the fly. Therefore, handshaking takes place before shifting from one method to another or uses special algorithms at the destination end to extract the information by identifying the original modulation method. All the modulation methods, such as AM, FM, PM etc. have their own demodulation methods to recover the original signal at the destination end.

Equipment that does both modulation and demodulation is called a modem. Modulation and demodulation processes mainly aim to achieve the transfer of information with the minimum distortion or corruption, minimum loss to the carrier signal, and efficient use of the spectrum. Even though there are a number of methods or schemes for modulation and demodulation process, they have their own advantages and disadvantages as well. For an example, AM is used in shortwave and medium wave radio broadcasting, FM is used in Very High Frequency (VHF) radio broadcasting, and PM is popular with the digital signal modulation.

What is the Difference Between Modulation and Demodulation?

Modulation is the process of impinging useful information on the carrier signal, while demodulation is the recovery of original information from the carrier signal. Usually, modulation occurs at the transmitter while demodulation occurs at the receiver.

Summary – Modulation vs Demodulation

The difference between the modulation and demodulation is that modulation is to transfer the message signal by adding it with the carrier signal while demodulation is the process of filtering out the actual message signal from the carrier signal. Both modulation and demodulation processes are equally important to transfer an information signal using a carrier signal. Therefore, the modulation method we use at the transmitter must be exactly compatible with the demodulation method at the receiver end to achieve a proper transfer of information from one location to another.

Established in 2000, the Soukacatv.com (DSW) main products are modulators both in digital and analog modulators,amplifier and combiner. We are the leading communication supplier in manufacturing the headend system in China. Our 16 in 1 and 24 in 1 now are the most popular products all over the world. For more, please access to https://www.soukacatv.com/.

Source:differencebetween

How Does a Hotel TV System Work? | Soukacatv.com

Hospitality TV services are more than just a way to provide entertainment options for hotel guests. Cable TV providers for hotels typically offer solutions that include interactive services (and in some cases, business services) for people who need to stay connected while on-the-go. TV hotel connections are more than just modified business or consumer-grade solutions. They're custom built from the ground up to offer the type of experience your guests won't be able to find anywhere else.

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https://www.soukacatv.com/.

TV Systems for Hotels: Breaking It Down

In a traditional setting, every television in a building that you would want to provide cable TV service to would need to be connected to a set top box of some kind. Cable companies send audio and video information into the building to the box and the box passes it on to your TV.

In a place like a hotel with hundreds of TVs, this would be prohibitively expensive. Because of this, hotel TV systems hook each TV up to a central "stack" of boxes located elsewhere in the building. Each box is always playing one channel and whenever a guest switches to that channel, they access the feed from the box in question.

Most hotel TV systems use either satellite TV or cable TV companies to provide content for their guests. Things like picture quality, channel availability (including both SD and HD channels) and whether HD is defined as 720p or 1080p will all vary depending on the provider in question.

What is Pro:Idiom?

These are sometimes referred to as Pro:Idiom TV services because of the advanced level of encryption that they provide. Pro:Idiom encryption allows for the delivery of high definition digital television and video content on demand, and in a highly secure way. This is often required by pay TV services like HBO, Showtime or even ESPN before they will allow their signal to be used in a business such as a hotel.

Pro:Idiom technology is what eliminates the need to use set top boxes, as the central decoder in a hotel room decrypts the video from the received feed and re-encodes it for more secure delivery to the specialized TV sets in each room of the hotel.

Why Choose Cable One Business for Hotel or Hospitality TV?

These are sometimes referred to as Pro:Idiom TV services because of the advanced level of encryption that they provide. Pro:Idiom encryption allows for the delivery of high definition digital television and video content on demand, and in a highly secure way. This is often required by pay TV services like HBO, Showtime or even ESPN before they will allow their signal to be used in a business such as a hotel.

Pro:Idiom technology is what eliminates the need to use set top boxes, as the central decoder in a hotel room decrypts the video from the received feed and re-encodes it for more secure delivery to the specialized TV sets in each room of the hotel.

What About Hotel IPTV (Internet Protocol Television) Systems?

IPTV hotel solutions are the natural evolution of this concept. Instead of using coaxial cables to deliver television signals, hotel IPTV systems allow audio and video information to be transmitted over the same cables used to deliver the internet connection to an environment. This is often referred to as Internet Protocol Television (IPTV) according to EngineersGarage.

The major advantage of this, is that all digital services can be integrated from phone to internet to television and more, thus creating a more reliable and unified experience. Cable companies offer solutions that allow hospitality establishments to provide a wide range of services beyond traditional television content, including but not limited to:

• Local news and weather information
• Information about local attractions and points of interest
• More advanced, interactive hotel services
• Video games
• Internet-connected applications
• Movie rental services
• An ordering portal for hotel amenities and more

Established in 2000, the Soukacatv.com (DSW) main products are modulators both in digital and analog modulators,amplifier and combiner. We are the leading communication supplier in manufacturing the headend system in China. Our 16 in 1 and 24 in 1 now are the most popular products all over the world. For more, please access to https://www.soukacatv.com/.

Source: business.cableone

Comparison of Hospitality Industry CATV vs MATV vs IPTV Distribution System | Soukacatv.com

Few of the essential difference between MATV, CATV and IPTV are explained here below:

1. MATV (Master Antenna TV). Master Antenna Television or MATV, describes an analog cabling network which is used to distribute various television signals throughout a facility. With the installation of multiple satellite dishes, for centrally subscribing and distribution of any channel, from any part of the world (both Pay and Free TV services) can be delivered locally using the technology popularly termed as SMATV or Satellite Master
2. CATV (Cable TV). CATV is nothing but the home-to-home Cable TV delivery using traditional coaxial cable connection to each of the residential premises to distribute TV from a central point or head end. CATV services are more or less irrelevant for large Hospitality properties, since majority of their clients may not require local channels.
3. Antenna TV system. Thru installing MATV/SMATV capture and distribution infrastructure (popularly named as ‘headend”), the property owner provides each room with a Set Top Box (STB) provided by the broadcaster, which is normally housed centrally at the headend room to avoid accidental mistuning of channels by the guests. Each channel is modulated and distributed through the cabling network. Only a TV with remote is required in each room, and the entire channel array, shall be displayed locally. The traditional analog headend system used to have several noise-generating components that affect the signal levels resulting in distortions in end-user TV signals like ghost images, snow, etc. Another issue of analog headend used to its limited channel capacity. While, the maximum theoretical limit is 106 channels, practically, it never used to exceed 80 channels per system.
4. Digital Video Broadcast SMATV. The above indicated drawbacks have been corrected in MATV systems based on Digital Headend. Poor signal quality and 80-channel limitations have easily been resolved by converting the TV signal transmission from analog to digital (DVB). Using DVB set-top boxes, each channel is converted to digital RF into AV or HDMI, which is fed directly to the AV or HDMI port of the TV. However, improper selection and sizing of these headend or its encoders can result in pixelisation and garbled TV picture. However, There is a significant cost in converting feed from analog to digital for encoders, QAM’s, etc. Local CATV services usually beams only local TV channels. Major benefit of SMATV over CATV is that, you can stream any TV services from any part of the world to your foreign guests/visitors.
5. IPTV (Internet Protocol TV). IPTV is when the media-to-broadcast content is Ethernet. Using large internet bandwidth, various broadcasting contents like TV, telephone, signage, video on demand, high speed internet etc can be delivered to end-user using a single UTP cable. Also, IPTV is a two-way communication. This means a hotel guest can communicate to the main hotel server to retrieve information like on-spot bill, room service ordering, laundering, car rental bookings, and messaging. The possibilities of IPTV are almost endless. For eg: Menu cards can be translated into various international languages, to help the guests know about any dish that they wish to order. It can be in terms of calorific value, feel and look of a dish, preparation time and method. Further, centralized Remote management of set-top box of every room TV is possible. Each set-top box is individually addressable for any specific guest message or function.
6. Importance of IPTV Sizing. Content delivery of IPTV requires right infrastructure planning. Such infra requires factoring of various operational requirements such as dissemination of number channels, services that are to be delivered, level of interactivity etc. Also, need to consider the convergence requirements of the project; say, the Data network, high speed internet, telephone services, signage, conferencing services etc shall share the same media, which will have tremendous Return of Investment (RoI). Towards this, only enterprise grade network hardware, having support to advanced streaming protocols are to be used on the network and are critical to handle the requisite "speed", "compression", “buffering”, “data processing thruput”, etc for a quality IPTV/Convergence infrastructure. Setting up of two parallel networks for IPTV and other IP services is not a good planning and is not going to be cost-effective.
7. The above aspects have been tabulated for the Busy-Eyes below:-

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Source: https://www.linkedin.com/pulse/catv-vs-matv-iptv-distribution-system-comparison-cdr-jacob-koottummel