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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 (http://www.mp3soundstream.com/cgi-bin/cppro/go.cgi?snichols1)uses
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 www.infotechcomms.co.uk/info10.htm 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 http://www.infotechcomms.co.uk/info11.htm
About the Author:
Steve Nichols (steve@infotechcomms.co.uk) 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. |
