How To Capture online audio from e-learning

The article focuses on the capture and audio at the base, and certainly the many recommendations listed below should help you in the right direction.

1. Microphones

For the story, you need a microphone to the voiceover. Of course, your laptop or PC can be an integrated microphone, but you probably do not want to until the end of the survey, such as the interruption of the steering wheel of your speakers fast-food restaurant. There are several mics to choose and they are designed for different purposes.

Dynamic microphones are the ones you see are often from the rock concert. They have a similar shape to the head shot. These microphones are omni-directional, which means they can change the sound from a wide area. Shure SM-58 microphone is an example of a dynamic microphone and has a quality and dynamics, the need for all types of applications.

Condenser microphones, as opposed to dynamic microphones, in a capacitor, be required by a source - either the battery or A / C. These microphones are often used in the recording studios, for the concerts, and one often finds in the Microphones bolt (the kind that you tie to a shirt or lapel). These microphones are uni-directional, which means that the inclusion of a closer's. Because of its power, its output can. The Neumann KM-105 is an example of a condenser microphone.

You may also find a Headset Microphone, from the input and output source, so you hear what you say that you save. Most microphones on these headsets have a function to undo noise in them. Causes of this survey is not natural breaks between sets. The quality of this type of microphone is also blown to the right that the position of the microphone is very close to the mouth. What higher frequencies tend to reduce their loud and low sound frequencies.

Built-in microphone tends to collect all the noises from your computer to use. This means that each hard drive movement, cooling fans, the operating system, sound, space and atmosphere. These microphones are usually used for the wide area, to situations such as Web conferencing and chat sessions. The sound quality is generally poor and the microphones are not sophisticated functions, such as the removal of noise or balancing charges. If possible, you should avoid the microphone of your source audio.

2. Microphone distance

I'm sure you all on video and Rock American Idol, the rock stars have the microphone in front of the mouth, as it's singing. Most people think they must be maintained on the registry of the story. What rock have to their advantage is a limiter, which through the frequencies on a given route. The maximum output is determined by this, that or undesirable back quietly, because the frequency is automatically limited. Very likely, this configuration is simply not possible.

One thing you can do to prevent unwanted noise in your story, is the positioning of the opening 6-12 inches in the micro-and speak directly into the microphone, not far from him on each side before them. The best signal is a direct path from your mouth to the microphone. When you speak into the microphone and the inclination of the head down to one script, which you will be able to determine the decrease of the audio signal. If necessary, hold the script in the vicinity of the microphone. Other tips: When playing a script does not read in the pages that you or turn from one side to another. Most microphones are quite sensitive to collect all the papers of this movement. If possible, each page of the script to be segmented and separated, and not stapled or held with paperclips.

3. Using a windshield

Constant frequency enables the best sound. If you click on an audio waveform for the first time, you will not be able to decipher, but the peaks and valleys of each frequency can obviously say much about the sound. One thing that often, especially when taking a story that unfolds when you say words with P or B This is about the dynamics and therefore does not seem like a P or B, but as a tone burst.

A simple solution to this problem is a windscreen. Some engineers synthesis of a handlebar with nylon line and before the microphone to a windshield a small budget, but you can purchase for less than ten dollars in your music business. They are on a foam material and the design of your microphone.

4. Interfaces

So far, I have a lot of time into the microphone to speak, but most microphones recommended here will not even connect to your computer without an adapter. Professional microphones have XLR connectors, which are more than three pins. Most computers have connections with eight inches. You can change the dynamic microphone with an adapter to your computer without major problems. Condenser microphones, because they need energy, not working, even with an adapter.

Interfaces, there are specially built and they come in two versions: USB and Firewire (IEEE 1394). Most PC vendors include USB 1.0 or 2.0 or on the ports for their hardware. Firewire is more than just on Apple computers, but you can use the FireWire card for the PC. FireWire is faster than USB applications, and is therefore desirable for the audio input. There is less latency over a FireWire connection via a USB connection because of the performance speed.

FireWire is available in two versions, there are FireWire 400, allowing the transmission of data with a throughput of 400 MB per second and Firewire 800, which is twice the speed of 800 MB per second. There are a variety of interfaces for digital music on the market, and you can be one of these technologies at the interface with a computer. M-Audio has one of two ways, including the 610 and the USB ProFire RapidEmploi.

These devices can be from their connections and as an audio input / output of your source computer to a professional results. In SyberWorks is a M-Audio FireWire 410 audio interface with two Shure SM-58s for our narrative. The 410 is a choice, because there are multiple entries, and all necessary controls for audio / gain level and limiter / compressor. He also has XLR inputs and one quarter inch for the microphones and instruments, and two headphone jacks. On the 410 there are two M-Audio BX8a monitors, the better sound quality, any computer speaker.

5. Software

There are so many options for audio software that is simple shareware / freeware for the specialist that the determination that the use can be anywhere in a household. The basic tools for audio recording, with each Windows machine does not generate the audio quality. Every computer comes with Apple's GarageBand, this is an excellent means for the audio recording on the application level. GarageBand is the step child Apple Logic Studio and offers sophisticated tools for recording, editing and delivery of audio recordings on any platform.

Adobe has an Audio / Sound Booth for assembly, which a number of tools for cleaning up audio files and save in different formats. Sound Booth is with the Creative Suite Production Premium and Master Collection. I recently Soundbooth cassette record old songs in the MP3 format, so I burn the files on the CD. I was able to Sound Booth for the cleaning of the entire hiss on audio and the quality was excellent.

Bias, Inc. has been in the area of audio production for more than ten years and now their software beacon audio, Peak Pro is an award-winning. With a simple interface and a variety of effects and control, Peak audio is simple. I am a longtime Peak Pro and can say it is a stable country, professional application provides all the tools that I need to edit that I am able to record sound. Combined with SoundSoap Pro, a cleaning audio, Peak Pro, the noise, hiss, hissing, cracks and pops, and other unwanted noise from any audio recording.

6. Normalize

While recording the audio can create Mismatched during playback to undesirable results. For example, the inclusion of two different sources can be two types of volume. When playing a source of soft tones and the other may be strong, even if they were in a room on the same computer with the same material. This is also the style of voice or audio input is not properly monitored.

To gain by the board, so that the volume is relatively homogeneous, most audio software provides an option in the field of standardization of level, to be tested and a minimum and maximum bandwidth are determined. Sons increases are soft and the sounds are greatly reduced, so that the total sound level consistent.

If there is a contrast between the two sources of entry and the sound of standardization plays against you. Softer sounds may be in addition to his, if the profit is increased. Do not forget your receipt before the recording. Try from the two sources, to come to the same decibel level before recording. If possible, show the item in your audio software for the speaker and try to speak to a gain of -5 dB.

7. Audio Cleaning

Depending on how your own source, in this May, a soundtrack that is characterized by snoring or noise from various sources such as fluorescent lighting tubes, A / C noise and other sounds d mood. Peak Pro Sound Booth, and both have the tools to make these kinds of sounds from your audio sources. As mentioned above, the basic rule always applies.

Some of these tools you can start your very natural sound of metal and not more than computerized version of the original. When using SoundSoap Pro, for example, the default settings, the noise keeps all high visible, while the middle and low sound quality to suffer dense computing. Sound Booth correction from the noise of the instruments have the same problem, because it is also not as the result of pressure.

There is a balance with the amount of correction is due to a relative to the quality of production. Sometimes here in the SyberWorks, we store the voice on the telephone. The sound quality from a phone line is always problematic, so the sound will always need to be cleaned. For the correction, if the integrity and the voice. On the other hand, no correction of the inevitable to a large number of pipes and tone on tone, which is not desirable.

8. Audio Formats

According to the authoring tools that use the platform, that you know what audio formats to be used. The most important audio formats for PC platform. Wav file on the Mac platform. Aiff. Adobe Captivate and Microsoft PowerPoint format. Wav.

The most popular, the Internet is now the audio format. Mp3, the greater compression and better sound quality than the other Internet formats. Captivate using MP3 files for final output. This makes the files smaller, but it can raise the quality, depending on the settings in Captivate. Native. Wav files in PowerPoint files can be very large. Ispringen use a converter for PowerPoint to Flash, you can significantly the size of files, presentations and materials for Internet delivery.

SyberWorks Web Author is another tool called SyberWorks Web Audio allows you to audio courses that everyone can hear, just a Web browser. Playback is via a small Java applet that is downloaded automatically and quickly. It requires no additional plug-ins or server software. He has no firewall and can be used in the background, without any control on the last pages, or with a small group of audio controls will appear.

SyberWorks Web Audio Tool is an audio file format. Wav SyberWorks and compresses the audio format (. CVS). It is simply in the Word document into the model to add SyberWorks audio.

9. Compression

Depending on the nature of the program at the time you register, you are probably an original audio source with a CD-quality (44 kHz) output. This quality will be reduced once the file is compressed. For the compression and the sound quality is a bit like R2-D2 behind a large metal. Too little compression and the files too large to transfer and play.

The factors used to compress the bit rate and quality. The data flow is the target for your audience. The nature of the Internet these days, at least the speed DSL (128 Kbps), but there are still users of May to speeds of 56 Kbps modem. Tools such as Adobe Captivate allows you the speed and quality for all audio files in your course. Therefore, if your files or Peak Pro Sound Booth, never adding compression. Let your Captivate or other e-learning tool to the compressed.

Preferences for quality may also change the size of the file. Decline in the quality of compressed files, and therefore are smaller, the sound, but the worst. With higher quality, less compression of files, which do their best, but larger file size.

One trick is to try the different stages of compression, and attitudes and be heard in every issue to find, that's right. May it take a while, but ultimately counts, e-learning product is best for them.