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10 tips for capturing audio e-Learning

With audio in your online course is extremely important to involve your audience. Studies showed no audio courses are less compelling and memorable audio course. Or use it as a story or direction, audio – is the right way – Can improve many of their e-learning materials.

Using the audio designers of online courses

Engineer Sound and knowledge necessary to adequately assess, edit and clean up production audio quality is a task which is usually beyond the skill set of developers more online courses. The average developer has little or no knowledge of rates sampling frequency, modulation, compression and other audio engineering concepts.

The purpose of this paper is provide information on how to get audio into a format suitable for e-learning tool-authoring. The article will focus on capturing and audio editing at the grassroots level and, of course, the 10 tips below should help to move in the right direction.

1. Microphones

For the record, you must use a microphone for voice-over. Of course, your notebook or desktop can have a microphone, but you do not want to end up looking like he broke the wheel "in your local fast food restaurant. There are several mics and the choice has been made specifically for different purposes.

Microphones are dynamic, which are commonly used by rock stars at concerts. head shape ball. These microphones are omni-directional, which means you can capture the sound of the entire region. The Shure SM-58 microphone is an example a dynamic microphone and a consistent quality and dynamic range makes it useful for all types of applications.

Microphones, unlike dynamic microphones, have a capacity of internal forces to be supplied by a source – battery or A / C. These microphones are often found in studios registration used in live concerts, and clip-on microphones are commonly (the kind that attach to a shirt or jacket). These microphones are unidirectional, This means that the capture of a narrow sound. Given the demands of its power, its output voltage may vary. The Neumann KMS - 105 is an example of a condenser microphone.

You can also find a headset that connects directly to the input source your computer and the power output so you can hear what you say you are saving. Most of the microphones on these headsets are noise canceling function integrated. This probe silences between sentences against nature. The audio quality of these microphones tend to sound off as the microphone position is very close to mouth. This causes the frequency higher tendency to loud sounds and poor low frequency sounds.

Microphones tend to pick up any noise generated its team during their use. This means that any movement of the disk drive, cooling fans, sound system and operating room environment. These microphones are generally designed to capture a larger area of sound for situations such as Web conferencing and chat room. The sound quality is poor microphones and no advanced features such as the removal of noise or balance. If possible, avoid using the microphone the audio input source.

2. Working distance

I'm sure you've seen all the videos of rock or American Idol, where rock stars have stuck the microphone against his mouth, as they sing. Thus, most people feel the need to do the same when Record the narration. What rock stars have for her is a sound limiter that cuts frequencies above a certain range. Maximum power is controlled by this unit to avoid any adverse reaction or dumb, because the frequency is automatically limited. Most likely, setting simply does not have this capability.

One thing you can do to prevent unwanted noise in his narrative, is the position of his mouth about 6-12 inches from the microphone and speak directly into the microphone, not far from there, anywhere, or in front of him. The sign of the best audio be a direct path from the mouth to microphone. If you start talking into the microphone and then tilt your head down to read a script, you may notice a decrease in signal audio. If necessary, keep your dashboard next to the microphone. Another tip: when you read a script, do not read the pages turning or moving one side to another. Most microphones are sensitive enough to pick up any movement of this paper. If possible, each page of the script segmented and keep them separate, stapled or not open, then such as paper clips.

3. Use a windshield

A frequency consistently produces the best sound. If you are looking at how audio waveform for the first time, you will not be able to decipher, but the peaks and the valleys of each frequency can visually tell a lot of that sound. One thing that happens often, especially during the recording of narration, are pollutants Persistent Organic produce when you say the words beginning with P or B. These bursts exceed the dynamic range and therefore do something does not sound like a P or B, but rather a popping sound.

A simple solution to this problem is a windshield. Some engineers are equipped a metal clothes hanger nylon stockings and put them in front of microphones to act as a windshield on a budget, but can also be purchased under ten dollars in your local music store. They are constructed with a foam material and more mic.

4. Interfaces

So far I have spent much time talking about microphones, but most microphones recommended here not even connect their computers without the need for adapters. professional microphones with an XLR connector, which has three pins. Most computers are made with connectors eighth inch. You can use dynamic microphones with an adapter connected to your computer without too much trouble. Condenser microphones, because they require energy, does not work even with an adapter.

There are interfaces built specifically for this purpose and available in two versions: USB and FireWire (IEEE 1394). Most computer manufacturers include a USB 1.0 or 2.0 on your hardware. Firewire is more commonly found on Apple computers, however, buy firewire card for PC. Firewire is faster than USB in certain applications, and thus is more appropriate for audio input. There is less latency in a FireWire connection to a USB connection, because of the speed of execution.

Firewire is available in two flavors, no Firewire 400, which can transfer data at a rate 400 MB per second, and FireWire 800, which doubles the speed of 800 MB per second. There is a wide range of music in digital interfaces available today, and you can use these technologies to interact with a computer. M? Audio has a line of two varieties, including the ProFire 610 and USB FastTrack.

These devices can operate beyond its planned connections and act as an input / output audio source for the team to provide a record professional results. At SyberWorks, we use an M-Audio FireWire 410 audio interface connected to two Shure SM-58 for all our story. The 410 is a powerful option, because it offers multiple inputs and all necessary controls for the audio level / gain and compressor / limiter. It also has XLR and quarter inch inputs microphones and instruments, and two headphone jacks. 410 are connected to two monitors BX8a M-Audio, which offers sound quality production much higher than any Which computer loudspeaker.

5. Software

There are so many options for an audio editing software shareware Single / freeware professional level, the determination of what use could be somewhere in its budgetary constraints. The basic tools for recording audio come with any Windows computer does not generate audio quality. Any Apple computer comes with GarageBand which is an excellent application of audio. GarageBand is the poor cousin of the Apple Logic Studio provides sophisticated tools for recording, editing and delivery of audio recordings on any platform.

Adobe has an audio application / Soundbooth edition called, which offers a variety of tools to clean and save audio files in various formats. Soundbooth provided with the Creative Suite Premium and Master Collection production. I recently used the cassette Soundbooth to record old songs as MP3 files that you can burn files on a CD. I was able to use Soundbooth to clean everything on tape hiss and the quality is excellent.

Blas, Inc. has been in the area of audio production for over a decade and audio editing software flagship, Peak Pro Winning a scholarship application. With a simple interface and a variety of effects and controls, Pico do simple audio editing. I am a long time user Peak Pro and I can say it is a stable, professional application that offers all the tools you need to edit the recorded audio. Combined with SoundSoap Pro, a cleaning application audio, Peak Pro can reduce noise, whistles, noises, cracks and persistent organic pollutants, and other unwanted sounds from any audio recording.

Here at SyberWorks, use Peak Pro to record a narration GarageBand podcasts or courses and podcasts and pranksters. GarageBand comes with Stingers and screening effects are great for podcasts. It is ridiculously easy to use. Once the file has been created, it is output to an AIFF file in iTunes. Then use iTunes to convert sound into MP3 format for delivery.

6. Normalize

During recording, sound levels can create undesirable results are not during playback. For example, the recording of two different sources, could produce two different volume levels. When playing, the source of a softer sound and the other can seem stronger, although there were in the same room on the same computer with the same hardware. This can be attributed to the vocal style or level input audio are not sufficiently controlled.

To adjust the sound levels in all areas so that the volume is relatively constant, most audio editing software offers a choice of normalization that noise levels are examined and a maximum and minimum range is determined below. sounds weak is increased and reduces the loudest sounds in the general noise level is more consistent.

If there is a strong contrast between the two input sources, then you can work against you sound normalization. softer sounds may be more added to them when the payment is greater. Remember to check your levels audio input before recording. Try to get two sources to reach the decibel level even before the recording. If possible, indicate that the counter input of your audio software and speakers address Spoken achieve a level of profit on? 5 decibels.

7. Uhm and Ahh

For some people who speak into a microphone can be a little intimidating. You can hear many Ahhh Uhmm and during a recording session. Some people naturally put these phrases in them because they are thinking what to say. Others have been expelled from the nervousness. Others have stressed Lisp S and Z. Others smack their lips or difficulty breathing before speaking.

When editing audio, the trend could be the elimination of all the levels and Uhm Ahh. When separated from the rest of the way, it is easy to do and is an effective way to make the whole sound file shorter. However, there are occasions when Uhm Ahh, got shot in sentences and are difficult to separate.

The golden rule when editing audio is to remove everything that is boring, but keep the tempo of the original sound source and it sounds as natural as possible. Some people also take deep breaths between the nasal passages or sounds that are picked up by microphones. Sometimes, they can be removed and may sometimes not. Delete what you can, but try as much as possible to save natural general.

8. Audio Cleanic

Depending on how clean your input source, you can have an audio track which is surrounded by a humming or noise from various sources such as fluorescent light general a / Noise and other environmental sounds. Peak Pro Soundbooth and both have tools eliminate these types of sounds from their sources of audio input. As mentioned above, the golden rule is still valid.

Some of these tools can make the audio sound of metal against nature, more like a version of the original scan. Using SoundSoap Pro, for example, the parameters default to remove the noise keeps all the honors, while midrange and bass sound quality suffer a computerized dense. Tools Proofing Soundbooth noise have the same problem, so if you take too much, the result is not worth the effort.

There is a balance the correction amount is applied against the sound quality of production. Sometimes, just by SyberWorks, we have to record the voice on the phone. The sound quality of the phone line is always problematic, so invariably, that the sound clean. Too much correction, however, and integrity voice is compromised. In addition, no corrections keep a lot of whistling noise in the sound, which is not desirable.

9. Audio Formats

Depending on what authoring tools they use and which platform you are, you need to know what audio formats are used. The audio format for major PC platforms. WAV file in the Mac platform, that's all. aiff. Adobe Captivate and Microsoft PowerPoint format wav ..

The most popular Internet audio formats of today. mp3, which has a higher compression and better sound quality than formats Internet. Captivate uses compression of MP3 audio files for final output. This makes the files smaller but quality may suffer, depending on the configuration of Captivate. Native. Wav files included in PowerPoint files can be large files. With iSpring, a PowerPoint converter to Flash, can reduce significantly the file size of presentations and training materials to be supplied to the Internet.

Author SyberWorks Web with an additional tool called SyberWorks Web Audio lets you add audio course that anyone can listen via a simple web browser. Exhibit is played by a small Java applet that downloads automatically and quickly. It requires no plug-ins or server software. No problems with firewalls and can play in the background without any visible control on the course pages, or a small set of basic controls for the audio sample.

SyberWorks Web Audio Tool is an audio file format. WAV and compresses SyberWorks audio format (. Sa). Then inserted into the Word document using the audio SyberWorks supplement model.

10. Compressors

Depending on the tool used for recording, is likely have an original source of the audio CD quality, near (44 kHz) output. This quality is reduced when the file is compressed. Too much compression and quality of sound is something like R2-D2 behind a large metal door. Too little compression and the audio file is too large transfer and read.

The factors involved in understanding include the bit rate and quality. Throughput is the purpose of data flow its target audience. The typical Internet connection today is at least the speed DSL (128 Kbps), but users may have modems at speeds of 56 Kbps. Tools as Captivate lets you adjust the speed and quality for all audio in its course. Therefore, when you save files or Peak Pro Soundbooth, do not add Never any compression. That capture or any other mail? Learning tools for you to compression.

quality parameters can also Change the file size. Download the file compression and quality are both are smaller, but its worst. The quality of case files less compression, better sound quality, but larger file size.

One is advised to try the different levels of settings compression and listen to each exit to see which one is correct. It may be a long time, but in the end, their product is better e-learning her.

Summary

We played a series of technical concepts in this article and much more. Whatever the tool you decide to use, incorporating audio sounds better than developing e-learning is an excellent way to bring the next level. Registration high quality audio can be challenging and fun. It may take some getting used to, but it is a skill that needs to be examined.

About SyberWorks

SyberWorks, Inc. (http://www.syberworkis.com) is a leader in custom e-Learning Solutions and Management Learning System Industries Fortune 1000 corporations, higher education, and other organizations. Located in Waltham, Massachusetts The company serves the multi-billion dollar e-Learning market. Since 1995, SyberWorks has developed and delivered unique and economical solutions to create, manage, evaluate and improve e-learning programs in businesses and organizations in the United States country of the United States Canada, Europe and others.

http://syberworks.com/articles/10tips-capturing-elearning-audio.htm

About the Author

Al Lemieux is a Senior Designer at SyberWorks, Inc. SyberWorks (www.syberworks.com) is a custom e-Learning solutions company that specializes in Learning Management Systems, e-Learning solutions, and custom online course development. Al is also a frequent contributor to the Online Training Content Journal. The Online Training Content Journal blog looks at best practices, techniques, and trends in online training development and e-Learning instructional design.

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