mourning analog » analog signal

Digital Video Versus Analog Video

Thu, 05 Aug 2010 16:42:39 +0000

Digital video is a new technology that can be used and manipulated much easier than the old analog signal. This generic term is not to be confused with the name DV, which is a specific type of digital video. In the past video was recorded on tape but today with digital video it can be recorded on tape, DVD or straight to the hard drive of a computer. This generic term is not to be confused with the name DV, which is a specific type of digital video. Digital video can be processed and edited very easily today, special effects are easy to add with digital editing.

Digital video can also be edited on a personal computer which has the proper hardware and software. Regardless of software, digital video is generally edited and needs quite bit of disk space to store everything. Digital video is also used in modern mobile phones and video conferencing systems. The quality of the digital video is far superior to the analog counterpart.

Artistic people will claim that the quality of digital video is cold, that you don’t have the warmth of the look of film images. But one thing is for sure. Digital video is here to stay, which means that our films of our 25th anniversary celebration are also here to stay.

These new cameras can record for several hours on end. The recording is done either on a small videocassette, blank CD or a DVD. Visuals are continuously recorded by these cameras and can be played on the screen.

Marketing videos with poor picture quality are likely to reflect a poor quality company in the mind of the viewer, so try to get the best quality video you can get. When people talk about interlacing they are talking about a special technique that improves the quality of the picture without increasing extra or more bandwidth. Using a camera that is analog you will need multiple tapes for long filming, but with digital video you need plenty of disk space to store all of the video. In the past when recording with tapes you will lose the quality of the recording when duplicating the information but with digital recording you do not have that problem plus the footage will last forever. Today many of the cameras come with many features that you only find in professional cameras. You can get better picture quality when using a more expensive digital camera.

When filming with a DVD format it will allow you to record right to digital disk, the other type of technologies are HDD and this allows you to record right to a hard drive. As the tape format is slowly being phased out by major manufacturers, it is a good idea to invest in disk or hard drive based digital video cameras. While this format is very easy to use and is supported by practically all software it is not efficient as there is no compression applied.

With digital video cameras today there are features that allow you to take low or medium quality footage to save space.

DTV Receiver

Sat, 31 Jul 2010 05:48:32 +0000

I want to introduct something about WSD 3010CX DVB-S receiver. Features: 1. Powerful single chip NEC EMM2LL 2. Conax CAS support3. Teletext support4. Displaying EPG & information plate5. DiSEqC 1.0, DiSEqC 1.2 and DiSEqC 1.3 compatible6. Max. 4000 channels and 2000 transponders7. Software upgrading via RS2328. AV (2 composite video, 2 audio) output9. 256 color user friendly on-screen display10. 5 ways to search programs 11. Parental control 12. Channel switching time less than 1 sec.13. Support QPSK demodulation14. Favorite channel editing and list15. Auto select program system16. S/PDIF digital audio output17. SCART output (optional)18. RF modulator (optional) WSD 3010CX DVB-S receiver mo

A USB digital TV receiver with its antenna

It has been suggested that this article or section be merged into digital television adapter. (Discuss)

A DTV receiver is a set-top box that permits the reception of Digital television. Its components are very similar to a desktop PC. The DTV receiver is a vital link in the chain of television system. The goal of a broadcasting system is to concentrate the hardware requirements at the source to simplify the receivers and makes it as inexpensive as possible.

It is usually connected to the TV set or incorporated in the TV set. The main features of a DTV receiver may be classified as follows:

decodes the incoming digital signal;

verifies access rights and security levels;

displays cinema quality pictures on the TV set;

outputs digital surround sound;

processes and renders Internet and interactive TV services.

Overview

Basically, the tuner in the box receives a digital signal from a cable, a satellite, or terrestrial network and isolates a particular channel. The signal is then forwarded to a demodulator and converted to binary format. Once in binary format, the demodulator will check for error and forward the binary signal to a demultiplexer that will extract audio, video, and data from the binary stream. Once the demultiplexer has finished with the signal, the decoders will transform the digital bits bits into a format suitable for viewing on the television set.

As the architecture of a DTV receiver can vary in function of the network operator or the set-box manufacturer, we have chosen to divide the physical components into the following categories:

system board,

tuner,

modulator and demodulator,

demultiplexer and decryptor,

decoders,

graphics processor,

CPU and memory,

storage devices,

physical interfaces,

physical carcteristics.

Architecture

System board

All the main hardware components of the receiver are connected to the system board. Buses are used to carry the digital TV information between the hardware components.

DTV Tuner

The Digital tuner module is available for accessing QAM-, OFDM, and QPSK-based networks. In addition to receiving inputs from digital networks, most tuners are also capable of tunng analog broadcasts. Tuners can divided into three broad categories:

Broadcast In-band (IB) Tuner. Once the signal arrives from the physical transmission media, the IB tuner will isolate a physical from a multiplex of channels and convert to baseband. The term baseband is used used to describe a single channelor digital signal, extracted from broadband signal which is basically a stream of multiple channels.

ut Of Band (OOB) Tuner. This type of tuner facilitates the transfer of data between the head-end systems and the set-box. They are widely used in cable set-top boxes for providing subscribers with medley of interactive services. Implementations of the OOB tuner tend to operate within 100 to 350 MHz frequency band.

eturn Path Tuner. This tuner allows a subscriber to activate the return of path and send data back to the interactive services provider. Implementations of this tuner tend to operate within the 5 to 60 MHz frequency band.

Modulator and demodulator

The function of the demmodulator is to convert the analog signal to a digital bitstream. Then, it checks for errors and forward the bitstream to the demultiplexer. The modulator reverses the actions of a demodulator and its function is to deliver a signal to the return path tuner.

Demultiplexer and Decryptor

The technology used in DTV television is MPEG-2. The demultiplexer selects particular packets, decrypts, and forwards to a specific decoder.

Decoders

A DTV receiver will normally contain three separate decoders for converting the digital bit-stream back into a format that can be heard and viewed by the subscriber.

video decoder. It transforms video packets into a sequence of pictures, which are displayed by the TV monitor. audio decoder. It decompresses the audio bit-stream. Different audio modes are usually supported by the DTV receiver: mono and dual channel, stereo, and joint stereo. A data decoder.

raphics Processor

The main purpose of a graphics processor is to render a range of Internet file formats and proprietary interactive TV file formats.

Central Processing Unit

The CPU, like in a desktop PC, is the brain of the DTV receiver. Functions provided by a CPU include:

initializes the various hardware components;

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Traditional Video Surveillance Vs Networked Video Surveillance

admin — Sat, 24 Jul 2010 00:31:49 +0000

Traditional Video Surveillance VS Networked Video Surveillance

CCTV surveillance system

1.Security focused, meant for monitoring by guards

2.Physically walking around site for inspection

3.Monitoring CCTV systems, only one location

4. If an incident occurs, the guards are your first level decision makers with limited information and authority

6. Comes as windows based system and virus problems

7. No integrated solution available and no warranty for product

Disadvantages of such old generation of CCTV

1. Decision makers are informed after a time delay with little to no details

2. Failure to meet the needs of growing multi-location

3.Does not give access to businesses or executives on the move

4. Dumb recording of all data- whether motion is there or not.

5. Limited Storage Capacity.

6. Does not take advantage of what internet can offer

Now Basic Market Demands are following

Basic Market Demands

Networked Video Surveillance Systems

1. Takes advantage of internet and counts available bandwith and gives you access for your desired location 24×7×365 with Maximum reliability, Systems Should work 24×7×365, Storage Protection.

2. Use existing network infrastructure and reuse existing wiring and cameras for low start-up and operating cost

3. Sensors can be integrated and alerts can be sent.

4. Can do motion base recording and Motion based alerts.

5. Turns Analog Video data into Digital Data can be married to business applications

example- At a ATM- the video can be sent with each ATM transaction.

6. Integrated full solution box is available with warranty.

Such a networked Video Surveillance Systems are now available in India and US markets for mid market.

Please visit www.cradle.com to know more about the networked Video Surveillance products.