Archive for December, 2010
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Dec
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Tips On Choosing A Car Audio System
28
Dec
Car audio has moved a long way from the old standard AM/FM Radio/Tape Deck combo. Today, in-vehicle multimedia systems include DVD video, television and navigation systems with local hotspot news. Common to all systems is the sound quality.
The quality of sound in a car audio system depends upon a number of factors – the type and quality of the media player system, the type of speakers used, the acoustics of the vehicle and interference from other devices.
Type and Quality of Media Player System
Before we look at the different types of in-vehicle media players it pays to have a basic understanding of audio quality. When deciding what type of audio system to install, and also when comparing one make and model to another, there are two key specifications to consider:
Signal-to-noise ratio [SNR] - a measure of signal strength compared to background noise in the signal or equipment. Measured in decibels. The higher the dB, the better. A car CD player has an SNR of 90 or 100 dB.
Frequency response [FR] - a measure of how much of the audio spectrum, from bass to treble, gets reproduced. It’s measured as a range in Hertz, and the wider the range, the better. Look for a CD player with a range of at least 10-20k Hz.
An FM radio, cassette player, and CD player all have different measurements for these specs. To help understand these two specifications, let’s compare a car tape cassette player and a car CD player.
Cassette player has an SNR of 50-70 dB. This is much lower than a CD player, so the sound quality degrades at each end of the spectrum. The FR is around 30-18k Hz for a cassette player, so does not contribute as much to sound quality as the SNR.
That’s why overall, a car CD player gives a much better sound than a cassette tape player.
Media players in vehicles today are either radio tuner, CD player/changer, or Digital Audio player.
CD Players & Changers
There are a number of options when it comes to playing CD’s in a vehicle:
An in-dash CD Player – often combined with radio tuner, WMA/MP3 player
An in-dash CD Receiver - with a multiple CD cassette / changer located elsewhere in the vehicle
Connect a portable CD player to an existing in-dash audio unit using either a cable and adapter or a bluetooth wireless connection.
When choosing a car CD player the first two things to consider are:
Will it physically fit into the vehicle?
Will it integrate cosmetically with the dash and other electronics?
Most decks have standardized form factors; so fit most cars, but there are exceptions, so make sure that the deck is suited for your car. You are usually pretty safe is the car stereo is made for the same market as the source of your car:
Cosmetic integration is a little more complex, but in many cases easily resolved through customisation features. For instance, many decks allow you to change the faceplates and color of the display.
Digital Audio Car Systems
With most home audio systems and portable players giving crisp quality sound using digital audio, we are no longer satisfied with the flat, bland analog sound from older car audio systems.
If you normally store your digital music files on CD, a compatible stereo or changer is a good option. Up to 10 hours of music [250 songs] can be stored on a single disc and allows use of random shuffling and repeat options. This disadvantage is ease of use, having to load and unload from cassettes located in the boot or under seats, and the limited file formats that your stereo can play back.
So now you have the media player selected, what about the speaker system.
Car Speaker System
The speaker system can be thought of in two parts: the channel amplifier and the physical speaker units.
Car amplifiers power the speakers in your car stereo system to provide crisp sound quality at high volumes. Each speaker requires one channel of amplification. This means a 4-channel amplifier, will support four speakers.
And choice of speakers is not limited either. With a range of options for your basic stereo speakers [2-channel], you can supplement the high note quality using a tweeter and the low bass notes with a sub-woofer. This gives you a standard 4-channel sound system that will rival your home audio system.
Adding to a basic car stereo option typically involves adding subwoofers, amplifiers and crossovers to tailor the output sound to personal tastes.
This does not mean the result is the boorish, obnoxious bass boom boxing that invades the entire neighbourhood. A subwoofer adds quality and purity to music.
For details of specifications on each part of your system, see Go-Reviews.com – Car Electronics Section
The main factors in selecting car speakers are:
Design or Speaker Type
Technical Specifications
Fitting & Mounting
Speaker design is about the combination of sound drivers for midrange, subwoofer and tweeter. Depending upon the combination, the set is known as a two-way, three-way or four-way speaker system.
Car speaker specifications are similar to home audio speakers; the main difference in technical specification to compensate for the lower power outputs of car stereo receivers.
The speaker technical specifications include sensitivity, frequency response, signal to noise ratio, power handling and impedance. We will look at these specification in more detail in subsequent articles.
The fittings and mountings are selected depending upon where you choose to position the speakers. Car audio speakers are either: top mounted or bottom mounted. Clearance depth is most important when installing new speakers in a non-factory speaker location. So check all of your components carefully before purchase.
With such a range of combinations available the Internet provides a valuable resource in car electronics reviews. Sites like Go-Reviews.com seek out reviews and consolidate the recommendations to give you a quick reference buying guide.
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Make The Best Use Of Audio Visual Technology
25
Dec
In today’s business world it becomes extremely essential to have the basic idea of audio-visual equipments as they play such an important role in various aspects of our work life. May it be a internal meeting or presenting a business proposal to a prospective client, projectors and other audio visual equipments are used in every step.
Besides the corporate world, professionals in the field of entertainment and showbiz are also highly dependent on audio visual equipments. Most advanced audio visual equipment today works systematically and are controlled by various programs and it requires some amount of skill and technical know-how to handle such equipment.
Most of these audio visual equipment come with their training manual and other documentation to help new users control and run the equipment. Some of them would also offer online and telephone support to help users with the technical details.
Today audio visual equipment is not just restricted to equipment, there are multiple programs that work in line with several equipment to ensure best output. These software and applications can often appear too complicated for first time users; however, they are also equipped with their training guides and other documentation that teaches how to make best use of the applications.
Trial versions of many of these software are available o the Internet which gives novices a chance to practice their skills before actually buying a full version of the software and getting into professional usage. There are also specialized books and magazines that provide valuable resource on various audio visual equipment and the applications and programs that are used with them.
While it is definitely good to learn how to operate these audio visual equipment it would probably not be necessary unless you decide to buy the equipment for regular use. There are various companies that provide audio visual equipment on rent and if you need them for just one -off use it is always advisable to take them on rent. Good quality audio visual equipment are often costly and are not really a feasible option to buy if there is no steady requirement.
When you get your audio visual equipment on hire, most equipment supplier would provide technician who would install the equipment where you need it and set it up to perfection. They would also provide you the necessary training which will enable to you to run the show. In case you face any issues most suppliers would provide necessary support to resolve them. However, knowing the basic operations beforehand will help you to be more confident with the equipment and manage your show more professionally.
Pointers for Audio Visual Technology Beginners
There are some basic points that you should learn before you get on to handle any equipment. It is important to learn these points because they can make or break your show and without knowing these it would be almost impossible for you to run the show.
You should know all the details in respect to power sources, connection wires and cables and proper placement of the equipment. You need to take care, as even the slightest fault in switching the equipment on can cause total system failure.
Play around with your audio visual equipment for some time and you will slowly get to learn more about it. User manuals and tech support guys can definitely help you have a better understanding of the equipment however, the more you use them the better control you will have on them.
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Dec
6FT(2M) Gold Plate Premium HDMI to DVI Ferrite Core Cable Review
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Audio Video Storage Cabinets
23
Dec
There are many different things to consider when you are purchasing an audio video storage cabinet. People have a number of things around the house or at their place of work which need to be stored in the most efficient way possible and for a low cost. This article will give you a few different things to consider when thinking about what you need in your audio video storage cabinet.
Whether you want to store video games systems, a DVD player, or stereo, you need space. Having enough room for everything is one of the most important aspects of your cabinet, because it allows all of your equipment to be stored in an easy and organized way to make things run more smoothly. People often have multiple things running at once, such as a DVD player, television, and speakers, so having enough space in your cabinet is critical if you don’t want to take up too much room with a second cabinet.
You’ll also want to make sure that the price is right too. Shop around a little bit at various office supply stores as well as other places that might sell furniture, including audio video cabinets. When you are talking with a sales person, you will most definitely want to convey what you need exactly, including all of the different devices you plan on storing in the cabinet, so you can have an idea about what kind of cabinet you want and how big as well.
An audio video storage cabinet should be able to hold everything you need while still not taking up too much space and saving you a few dollars in the process. Most people just go out and pick up the first thing they see, but it’s important to take your time and consider what would be best for you. You want a cabinet that will look nice in your home or office as well as store everything in an organized and efficient way so you don’t have to worry about space. If you plan on putting many different things in your audio video cabinet, you might want to consider looking for one with different compartments that come out and can be put back in, so you don’t have to buy an overly large cabinet that takes up way too much room. All of these things and more should be considered when you plan on purchasing a good audio video storage cabinet that will do the job for you.
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M Audio Fast Track Review – Vs Digidesign Mbox2 Mini
22
Dec
The M Audio Fast Track USB is a stereo interface, capable of recording 2 signals simultaneously. It has a single mic pre plus an instrument input along with a headphone output and unbalanced RCA outputs. The quality of the mic pre has been improved over the first Fast Track USB and now it has phantom power.
This new model has top loaded knobs making it easier to adjust controls. The older version was very small like this one and had all its features controlled by knobs mounted on its front face. This made it a little uncomfortable to quickly adjust levels without touching something else.
Pro Tools Essential
This interface is compatible with Pro Tools M-Powered, it comes with a new version called M-Powered Essential. Many musicians wrongfully believe that to use this software you have to know professional audio recording. This new Essential version is limited to: 16 Audio Tracks, 8 Instrument Tracks, 8 Midi Tracks and 3 Inserts Per Track. It comes with about half the plug ins and content than the regular M-Powered version.
Digidesign Mbox 2 Mini Review
The Mbox 2 Mini is a stereo interface able to record and monitor 2 signals at a time. It features a mic pre in one of the channels while the second only has a line/DI input. Of course it comes bundled with the latest version of Pro Tools LE.
You can record a mic and a guitar, a bass, or any other mono signal together. The mic pre features phantom power and it has one headphone output. Most of today midi controllers connect via USB and unless you have external sound modules a midi jack would be unnecessary.
Another area where this interface shines is in light post production work. Many audio tasks in this industry can be done at home or in smaller stations at professional facilities.
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What’s New for Car Audio Head Units in 2010?
22
Dec
The car audio head units have come a long way. Gone are the days of old radio receivers which just plainly receive radio signals via AM or FM radio stations. The old models where quite basic and practical even having the capability to play cassette tapes at that time were quite amazing and most cars at that time would have a long antennas rising on the sides.
Sadly, until now we frequently still see some cars running with these installed. You might even see tuners which need to be turned and scrolled until you get to just the spot for each radio station until you get to hear the radio play without the scratching noise.
A new feature that is available today is the overall design of the whole system. Head units have become sleeker, stylish and very accessible. Distractions are one of the things you don’t need to have while driving. The old models need a lot of attention before it can function properly. The system needs to be adjusted frequently buttons need to be pushed constantly and the audio platform does not have that much functionality either. Today’s design offers style and function all wrapped up in a sleek and slim look. Touch screens now offers the best accessibility and lessens the distractions that operating it may cause. The now wide screen monitors help you operate the device much easier, added with the much needed Bluetooth access for a much comfortable hands free experience.
Lastly, another new feature for the latest head unit is the programs and the applications involved. They can no longer just play AM and FM, they also play most media files available today from audio to video and even to the latest blue ray movies.
The head unit now utilizes accessibility even for external storage devices such as USBs, hard drives and even cell phones. A great improvement from radio signals is the capability to access satellite feed both for audio and navigation purposes. You can now access a wide number of stations and much clearer sounds because it can now access data from satellites all over the world.
Not only is it able to provide audio, nowadays, global positioning systems are much more accurate and completely guides you through a programmed human voice how which way to turn, what is the estimated time of arrival and how much distance needs to be covered after you have inputted your desired destination. Another function that it offers is the simultaneous working of all your car audio components and even monitors through one head unit, this can synchronize all your devices through wireless connection.
Playlists also offers much needed comfort, presetting your desired media files and putting them in a designated playlist makes your sound experience very easy. You can simply play everything in a single click and even change your music depending on your moods. This completely eliminates having to change disks, change stations and distractions.
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Audio-Lingual Method
21
Dec
The audio-lingual method of teaching second languages has a long history in bilingual education and English as a Second Language (ESL) instruction. It has its roots in World War II, when the U.S. military developed the army method for teaching foreign languages so that students would learn them quickly. Charles Fries, of the University of Michigan, was instrumental in developing this method, which is also sometimes referred to as the “Michigan Method.”
It was also widely called the “aural-oral” method, because students were to listen first before speaking. It was developed in reaction to the grammar-translation method predominant at the time, the effectiveness of which had come into question because so many students had failed to achieve foreign-language speaking and listening proficiency.
The audio-lingual method became the dominant method for teaching modern foreign languages in U.S. schools from approximately 1947 to 1967 and was especially prominent during the immediate post-Sputnik era (late 1950s and early 1960s), when, galvanized by dramatic advances in the Soviet Union’s rival aerospace program, the National Defense Education Act promoted increased attention to foreign-language teaching and learning.
Foundations and Objectives Practitioners in the audio-lingual method for ESL and bilingual education were governed by a number of key principles:
- Language learning involves attending to form and structure.
- The aim is for linguistic competence and accuracy.
- Errors must be prevented at all costs in the course of instruction.
- Teachers must specify what language the student will use and control student interaction with the language.
The audio-lingual method is based on the structural linguistic and behavioral psychological view of language learning. Particular emphasis is laid on mastering the building blocks of language and learning rules for combining them.
The theory of behaviorism assumes that (a) language learning is mechanical habit formation and language is verbal habit; (b) mistakes should be avoided, as they result in bad habits; (c) language skills are learned better when practiced orally first, then in writing; (d) analogy is an important foundation for language learning; and (e) the meanings of words can be learned best in a linguistic and cultural context, not in isolation.
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cheap Monster THXI100-20NF for sale
20
Dec
Monster THXI100-20NF THX Certified RCA Stereo Cables (20 feet) Review
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