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Audio streaming > Adding audio to your web site.

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by: Steve Nichols
What do you do with your intranet or internet site once you've added words and pictures? How about adding audio as well?

Audio is friendly, direct and ideally suited to getting complex messages across in a short space of time.

It's now getting easier to add audio to the net, thanks to increasing bandwidths and innovative new ways of compressing data.

The problem has been that CD-quality audio has traditionally been the preserve of ISDN- and ADSL-equipped users. Basically, there has been too much data to fit down the pipe.

But, borrowing on the same techniques that are used to compress digital photographic images, it is now possible to compress sound to make it fit down a standard dial-up 56KBps modem line.

The trick is to compress the audio in a way that doesn't sound offensive to the ear, but can still pass along the line at about 3 kilobytes per second, given that a dial-up modem downloads at about 4-ish kilobytes per second.

The next trick is to use streaming technology that can start to play the audio while it is still downloading. As a long as it is downloads fast enough you don't get annoying stops and starts. You should also end up with a "buffer". In many cases, the whole audio file will have downloaded long before the user has finished listening to it.

The volume of online streaming audio grew by 118 per cent last year, according to market researchers US-based AccuStream iMedia Research and the top ten internet radio stations received an average of 137.5m tuning hours in the same period, up from 63m in 2003.

Typical audio formats are Real's Radio Player (as chosen by the BBC), the ubiquitous MP3 (as featured on thousands of youngster's personal hi-fis) and Macromedia Flash.

MP3SoundStream ( Flash and works well as 98% of computers already have the Flash plug-in and the rest can easily download it. Flash takes the MP3 file, combines it with an audio controller button and streams it for you off any server, which means low-cost and ease of use.

So once you have the technology in place, what can you record? The answer is anything. Adding audio to an intranet lets you record a weekly message from the CEO or a sales message. Or why not have a weekly news round-up?

The audio can either be recorded straight into your PC via a microphone and soundcard, or recorded on a Minidisc recorder and then digitised into the computer. Once there you can add music, voiceovers, cuts and fades with a program like Adobe Audition or Sony Soundforge. Music can be bought online for just a few pounds and you can even use free audio editing programmes, like Audacity.

What was once the preserve of the BBC and other high-end radio studios is now available on a desktop computer near you - but only if you have the skills to match.

FAQs (291 words)

Q. What is streaming audio?
A. It is audio delivered to your computer that can be listened to while it is still downloading.

Q. What's the advantage over other audio formats?
A. You don't get an annoying delay while the whole file downloads.

Q. What do listeners need to have on their computer?
A. A soundcard and speaker(s) or headphones, their normal browser software and a so-called plug-in - a small piece of software that converts the data into sound.

Q. This all sounds expensive - is it?
A. Not really. You can get free programs to record your sound, a computer microphone costs less than a tenner and there are free audio editing programs available on the net. You then need to convert the audio file to a streaming format, but there is an increasing amount of software available to do that too. You also need to think about a MiniDisc recorder as these have superseded cassette tape for most applications. Royalty-free background and intro music is available on CD and via the web for a small fee.

Q. What is the quality like?
A. Judge for yourself - visit and listen to the demonstration programmes. The trick is to get the quality as high as you can, but still make it playable on an average modem-equipped home computer. Once everyone has broadband it will be CD-quality for all.

Q. How do I find out more?
A. There is a list of useful links at


About the Author

Steve Nichols ( runs InfoTech Communications, which specialises in online communications. He has acted as consultant and trainer for many blue-chip companies including Aviva, AWG, Shell, Standard Life, HBOS, BNFL, AstraZeneca, Diageo, Accenture and Australia New Zealand Bank.<

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