Section 33.3. Preparing Your Own Audio


33.3. Preparing Your Own Audio

Recording and producing your own audio can require a significant investment in hardware, software, and time spent learning. If you need to put professional-quality audio on your site but aren't likely to make the investment in time and equipment yourself, consider outsourcing the work to professionals.

The final product may be anything from a simple personal greeting to a live concert broadcast. The preparation of original audio requires a number of standard steps: recording , basic sound editing, and then optimization for web delivery.

33.3.1. Recording

The first step is to make a recording of the music, spoken word, or sound effects for your site. As for most things, when it comes to sound quality, you get what you pay for. It is possible to capture sound using available resources (such as the microphone that came with your computer), but the quality will not be appropriate for a professional site. The cost of recording equipment escalates quickly for each level of sound quality. An investment of $800 to $4,000 in equipment (not counting the computer) is enough to get started on creating a home or small business studio. Getting a studio up and running also requires investments of time, effort, and education.

Although this may be a good choice for a business, it may be too expensive for many hobbyists and garage bands. It may be more cost-effective for an individual or organization on a strict budget or tight deadline to hire the services of a professional studio. Depending on how well the studio is equipped, it can cost from $30 to $250 per hour, and up.

33.3.2. Basic Sound Editing and Effects

Once you've recorded raw audio, the next step is to clean up the recording. This can involve removing unwanted sounds, setting the beginning and end of the file, and/or making a loop. You may want to apply effects to the sound, such as reverb or a delay.

Consider also using mastering processing techniques such as normalization or compression that can balance out the level of your audio such that no part is too loud or too quiet.

There is a huge selection of software for audio editing and format conversion . The software ranges from single-purpose utilities available via free download to professional digital-audio editing suites costing thousands of dollars. Some popular professional-level tools are listed in the following sections.

33.3.2.1. Cross-platform audio tools

These tools are available for multiple operating systems:


Audacity (audacity.sourceforge.net/)

Audacity is an open source audio recording and editing application for Windows, Mac, and Linux. With many built-in effects and editing tools, it can't be beat for the price (free).


Cubase (Steinberg, www.steinberg.net)

This multitrack recording environment offers both MIDI and audio editing with lots of effects plug-ins, virtual instruments, and recording tools for creating an entire virtual studio inside your computer. Cubase is available for Windows and Mac. Street price is around $600, while a more limited entry-level "SE" version is available for around $100 as of this writing.


ProTools (Digidesign, www.digidesign.com)

Long the industry standard for multitrack computer recording, ProTools offers everything you'd ever need for a professional-quality recording studio in your computer. The company's high-end "Mix" systems, including both software and custom hardware, start at $7,000 and go up from there, but Digidesign has recently started making consumer-level solutions such as the Digi001 and the MBox which offer ProTools software and a hardware input/output box for around $900 and $400, respectively.

33.3.2.2. Windows audio tools

The following tools are available for use on Windows:


Sound Forge (Sony, www.sonicfoundry.com)

Sound Forge is limited to editing stereo files, but it includes many plug-ins for effects such as chorus, delay, distortion, reverb, and compression. Street price is about $250.


Audition (Adobe, www.adobe.com/products/audition/)

In 2003, Adobe purchased Syntrillium Software and turned Cool Edit into Adobe Audition, a full-fledged multitrack recording and mixing environment with many included effects, processors, and tools for everything from audio restoration to surround sound encoding and CD burning. Adobe Audition sells for about $300.

33.3.2.3. Mac audio tools

These tools can be used on Mac systems:


Peak (Bias, www.bias-inc.com)

With built-in batch processing and a street price of less than $400, this application has been the Mac standard when it comes to stereo editing. Bias also offers the more streamlined Peak LE for $99. This "Light Edition" may be sufficient for most entry-level users.


Garage Band (Apple, www.apple.com/ilife/garageband/)

Apple offers several levels of audio editing software and Garage Band is their entry-level multitrack audio application. It comes free with most Macs or as part of Apple's $60 iLife bundle. Garage Band comes bundled with several virtual instruments and effects including a guitar amp emulator. For the price, it can't be beat.


Digital Performer (MOTU, www.motu.com)

Performer software has evolved from a MIDI sequencing application into a full-fledged digital recording studio environment offering top-quality effects plug-ins and audio editing. Musicians can make entire recordings with this software, but it is also just as capable at adding audio to video or mixing radio programs. Street price is around $550.


Logic (Apple, www.apple.com/logicpro/)

Apple's high-end audio application is Logic. It offers most of the features that you'll find in ProTools or Digital Performer and comes bundled with a huge assortment of digital effects and virtual instruments. Logic sells for about $1,000.

33.3.3. Optimizing for the Web

After the sound files have been recorded and edited, it is time to convert them to their target web audio format and make them as small as possible for web delivery. The tool you use may depend on the file format. There are also several tools specialized for the creation of MP3s. Tools are discussed with their respective file formats later in this chapter.

One great all-purpose tool is Autodesk's Cleaner, which is available for the Mac and Windows systems. This program is designed to get the best quality files at the smallest size in whatever format you choose. Cleaner can compress a number of file formats, including QuickTime and RealMedia. It can also do batch processing. The program sells for about $500 as of this writing. Regardless of the tool you use, there are standard ways to reduce the size of an audio file so it is appropriate for downloading via a web page. Not surprisingly, this usually requires sacrificing quality. The aspects of the audio file you can control are:


Length of the audio clip

It might seem obvious, but you should keep the audio sample as short as possible. For example, consider providing just part of a song rather than the whole thing. If you are recording a greeting, make it short and sweet.


Number of channels

A mono audio file requires half the disk space of a stereo file and may be adequate for some audio uses.


Bit depth

Audio files for the Web are often saved at 8 bits, which will result in a file that is half the size of a 16-bit file. MP3s can handle 16-bit due to their efficient compression.


Sampling rate

Cutting the sampling rate in half cuts the file size in half (e.g., a sampling rate of 22.05 kHz requires half the data than one of 44.1 kHz). As a general guideline, audio files that are voice-only can be reduced to 8 kHz. Sound effects work at 8 kHz or 11.025 kHz. Music sounds acceptable at 22 kHz.

Using these guidelines, if you start with a one-minute music sample at CD quality (10 MB) and change it to a mono, 8-bit, 22 kHz WAV file, its size is reduced to 1.25 MB, which is much more reasonable for downloading. Using MP3 compression, you can keep the quality of that one-minute sample at 16-bit, 44.1 kHz stereo (similar to CD quality) with a resulting file size of less than 1 MB. Combining these methods (a mono, 8-bit, 22 kHz MP3), you can offer one-minute clips at acceptable audio quality at only a few hundred K.

Obviously, just how stingy you can be with your settings while retaining acceptable quality depends on the individual audio file. You should certainly do some testing to see how small you can make the file without sacrificing essential audio detail.




Web Design in a Nutshell
Web Design in a Nutshell: A Desktop Quick Reference (In a Nutshell (OReilly))
ISBN: 0596009879
EAN: 2147483647
Year: 2006
Pages: 325

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