แสดงบทความที่มีป้ายกำกับ Multimedia แสดงบทความทั้งหมด
แสดงบทความที่มีป้ายกำกับ Multimedia แสดงบทความทั้งหมด

วันพฤหัสบดีที่ 19 พฤศจิกายน พ.ศ. 2552

Tips For Buying a Multimedia Projector

One of the hottest pieces of computer peripherals, today is a multimedia projector. You can view a multimedia projector for a variety of tasks, such as: presentations at conferences, board room presentations, video projection on a wall in your home movies and much more. There are several types of multimedia projectors on the market today. The main issue is that you should buy the projector? There are many brands and four types of multimedia --Projectors.

Multimedia projector brands and types

There are many brands of multimedia projectors to choose from: Panasonic, Optima, Epson, NEC, Infocus, and many more to choose from. Multimedia projector types include:

Digital Light Processing (DLP) has deeper black background and more portable
Liquid Crystal Display (LCD): better for color
TFT (Thin Film Transistor) Active Matrix: a type of LCD --
Home Theater HDTV: 480i, 516i, 540p,720p, 180i, 1080p, 1080i, 1125i (i = interlaced video, and p = progressive scan)

The most important considerations is the goal of the multimedia projector and applications in home or business that will help you select the features you need. To take into account features:

Brightness: 130 lumen range up to 6500 lumens
Desired Display Area 5 to 6 meters: 500 to 1000 lumens
Desired Display Area 8 to 10 meters: 1000 to 1500 lumens
Desired Display Area 12 to25 feet: 2000 lumens or more
Wireless: remote operation of computer
Digital Zoom: large room for projections
Keystone correction is not like projectors position perpendicular to the screen
Slim Size: Business portability
Projector Mount: necessary for permanent installations, ceiling or wall
Lamps: typical UHP, UHE, Halide Lamp, 1000 to 4000 hours, chose a long life
Business Use: video clips, animations, photos
Home Theater: LCD TV, HDTV, high resolution, high contrast, brightness from 1000 to 2000Lumen

The resolution is the number of pixels that the projector is the representation of the situation. Projectors with higher resolution, better quality projector screen, because there are more pixels per square centimeter. A projector with a lower resolution will have a grainy picture, because there are fewer dots per square inch. Resolution comes in a variety of choices, your choice of resolution is based on your use of the projector.

Only for basic Power Point presentations, you cana low-resolution projector. If you use lots of color and video, you need a high-resolution projector. Projector resolution ranges of 854 x 480 to 1280 x 1024

The contrast is the ratio between the brightest and darkest areas of an image. You want to choose a multimedia projector with a contrast ratio 400:1 or better. Contrast ranges from 350:1 to 6500:1.

The purchase of a multimedia projector

Once you have your multimedia projector choice (s narrows), visit your localstore and review their functions:

Projector Control: User-friendliness
Remote Control: User-friendliness
Lamp: long life bulbs are expensive
Connections: Cable for PC or MAC, DVD player, cable box, satellite box
Mounting Bracket: as needed for permanent installation
Wireless: compatible with your computer
Operation are: sales staff to demonstrate and observe such projection quality
Sound: the fan is loud
Size: Size does not matter when it comes to portability
Weight:permanent installations are not really concerned, heavier models are not suitable for portable applications
Carrying Case offers protection while dragging through airports, etc.
Rates: from less than $ 630 to $ 17,000 and more

Resolution and Contrast
Considerations and functions.



วันอังคารที่ 27 ตุลาคม พ.ศ. 2552

What You Should Know About Multimedia

In recent years, we have an important development in the computer industry see especially in the area of multimedia.

Multimedia and the Internet are two of the dominant trends in the field of high-tech equipment, software and telecommunications. Both subjects are represented more in the Windows operating system that includes well-known multimedia capabilities. Another important trend is the explosion of computers in the PC households. Most computers on the market now sells at least DVD-ROMUnit.

In addition to the sound board market, to accept additional enhanced audio performance, such as MIDI, which saw a spectacular growth. With this technology development, it is no wonder that Windows operating system contains many multimedia features. Close Up until a few years, multimedia functions usually contain only the noise of the window, open the windows, programs, etc. and a few warnings and a kind of "music" - electronic music. Was composed at the beginning of electronic musicSounds that could be reproduced in connection with some music and even had some vague melodies, the extraordinary, because it was easier to use than an audio-tape. After '95, when the operating system Windows 95 appeared, special hardware and software was created to convert music from cassettes to audio CDs. Conversion was not total, but a transfer from the audio CD on the PC. Slowly, things began to evolve, appear more advanced systems and more efficient components. Today, music is mostly used in compressedMP3 format, but it is positioned to different types of media. In the past, tended to offer computer users a series of poor quality media, text and graphics. But the improved performance of hardware components in the industry have a wide range of products, the degree to which the CPU, graphics functions, sound and full-motion video-guided use. To the benefits of multimedia components that you need additional hardware, more RAM (16-32 MB of RAM), and probably a bigger hard disk on whichto store video and audio files that you use. Today, music and sound on the computer has become essential. It should compress procedures and in many ways, but anyway the quality should be provided. That's why some instruments that are intended to start with the factory connector (MIDI) musical instruments interface. MIDI is a protocol that provides data transfer of digital music between electronic devices, enables, whether PC or keyboard. Without the necessary hardware such as PC Card with MIDIPlayback options, you have no sound from MIDI data. So MIDI data contain instructions that can only be played back the desired sound. One of the advantages it has, MIDI, WAV file to a normal file size is compared. Wav files included all the sound and can therefore have enormous dimensions. MIDI files only contain instructions for playing the sounds, and therefore are much smaller.

As the number of multimedia and games, including MIDI, a growing number of sound cardsthat with these opportunities (eg, a standard MIDI port for connecting MIDI instruments) are sold, also grows. Additionally, you can for example, MIDI, in order to emphasize the effect of multimedia presentations, realistic, visual presentation, which appears on the screen may seem to emphasize.

Another album of quality music recording is not a simple process. You need a DV editing. But the technician can not work without a good musician and a musician may not work well withoutTechnicians.

Windows provides several ways to use it to play multimedia audio, including the possibility of audio compact discs, and customizing the sound recording and playback. Installed play audio CD on a CD-ROM on your computer is possible, by using the CD player function. If you have a card, insert the CD into the drive is enough to launch the CD Player: 1 Open the Start menu and select accessories. 2. Select Multimedia and then select the CD player. 3. Access the CDPlay.

Windows can also detect automatically compressed audio discs, when in the CD-ROM set. Then, if you are the CD audio enough to click on the CD player. Since the CD player runs per background, you can listen to audio CDs while working on other applications on your PC.

From the sound of the old boards, the beeps were limited from a small speaker on the motherboard, in the late 80s, started working as sound cards, and multimedia and computer games through to an LEDComputer completely different level. Today, these systems are more complex when it comes to high professional standards. Motherboard and the sound and the interface there are different characteristics. Computer motherboard, the motherboard is the main component in the computer case. On it are the following components used: microprocessor, memory and other cards inserted into special slots: sound, modem, network card, etc.. Moreover, there are installed in parallel andused serial ports to connect peripherals such as mice, in conjunction with - printer, modem.

Most sound cards have installed into the PCI slot, while the older ones were usually on the ISA bus is installed. Many computer systems can now sound chips directly on the motherboard. This is a slot free for other peripherals leaves. Sound cards can be connected:

* Headset

* Speakers with Amplifier

* A source of the analog input as a microphone, a radio, aDeck with a box or a CD player

* A source of digital input as Digital Audio Tape (DAT) or CD-ROM

* A source for analog output - with Cassette Deck

* A source of digital output DAT burning a CD (CD-R)

Some sound cards have a socket in a very efficient output for 4 speakers and a digital output port. For audio, there is a new generation of digital sound card. A sound card is convenient for digital applicationsthat require digital sound. The digital sound cards, digital sound and digital outputs, so you can transfer data from DAT, CD or DVD to your hard drive into your computer. Normally, a sound card can do more things with clay:

- In order to reproduce music (from CDs or audio files like WAV or MP3), games or DVDs,
- The inclusion of audio in various media formats from various external sources (microphone or tape deckto)
- The synthesis of sound.

The DAC (Digital Audio Controller) and the ADC (analog-digital converter) to bring the transfer into and out of the sound card, while the DSP) (Digital Sound Processor to monitor the process. The DSP deals with any other sound change as an echo or 3D sound. As the emphasis on sound processing DSP, the processor of the computer with other things.

Sound cards used to create old synthesizer of the FM synthesis.Synthesizer takes notes of the various FM frequencies, and combines them to create an approximation of a certain sound, like a trumpet. While the FM synthesizer has reached a point that the very developing realistic sounds, it does not compare with Wave Table Synthesizer, which works by recording a small part of the actual instrument sound. This is still a solid play as well with incredible accuracy. Wave Table Synthesizer has become the new standard for most sound cards, but someBrands continue to use cheap FM synthesizers. Only a few sound cards, they are both. Sound cards have a much more sophisticated support for MIDI instruments. Equipped with a program of music, an instrument with MIDI are to be connected to the sound card, so you can see on the screen sheet music of your song.

Some people called "musicians' music produced with the help of computer programs that produce sounds and rhythms and with the help of synthesizers. The music is made these methodsQuality music, even if it sounds real and it is clear. It is made by the tool itself. Therefore, classical music and the live music is better because it has made by real musicians (professionals).