Introduction to Audacity Tutorials on DVD - $19.95

Audacity DVD

Receive all of the narrated multimedia Audacity tutorials - Introduction to Audacity, on one DVD. Play them locally on your own computer.

Price: $19.95 plus $4.95 shipping and handling. California residents pay 7.25% Sales tax. Shipped via USPS Priority Mail.

Audacity Tutorials
Audacity Tips & Tricks

Getting Ready to Record

Audacity Download
Audacity LAME MP3 Encoder
Overview of Digital Audio
Scriptwriting for Audio
Microphone Selection
High Quality Voiceovers
Setting Preferences
Saving Projects

Toolbars & Menus

Toolbars and Controls
Docking Toolbars
Meter Levels
The Track Tools
The Track Menu
The File Menu
The Edit Menu
The View Menu
The Project Menu
The Generate Menu
The Effects Menu Part 1
The Effects Menu Part 2

Working with Audio

Audio Tracks and Waveforms
Using the Label Track
Using the Time Track
Sound File Formats
Importing Audio
Fading Music Up & Down
Exporting MP3 Files

 

 

Digital Audio

This section of the Audacity Tutorial provides an introduction to working with sound and an overview of digital audio.

Stereo speakers

Recording sound with Audacity means working with a sound system. The range of equipment you may be using could vary from a simple microphone that came packaged with your computer to an expansive studio setup with expensive microphones, mixers, compressors, and other recording gear.

No matter what system you're using, however, the fact remains that all audio systems are based upon the same concept: Taking sound waves and converting them to electric current, manipulate them as you want to, and then convert them back into sound waves.

 

Analog Recording

In analog recording, the varying sound pressures in sound waves were reproduced with varying voltages produced by a microphone. These varying voltages were reproduced on magnetic tape with a metal coating. For the most part, recordings were made on tape and then distributed on vinyl records. On records, the variations in the width of the groove correspond to the pressure variations in the sound waves. This type of equipment however suffered from noise and distortion. Because of the physical contact with the medium during playback, additional noise and distortion of the original signal was added every time a recording was copied.

Digital Recording

In digital recording the soundwave is converted into an electric signal by a microphone. the physical propterties of the sound wave are converted into digital information which can then be decoded for final reproduction. The representation of an audio signal is not longer related to the sound wave. In digital audio, the value of the audio signal is sampled which produces numbers representing the value of each sample.

Measuring Sound

The intensity of sound is measured in decibels (dB). It represents the relationship of sound pressure level to sound intensity. Twenty decipbels (20dB) is about the sound made by rustling leaves. A jet taking off at 200 feet away can be as loud as 125 dB. The normal "Threshold of Hearing" is 0 dB and represents the hearing of someone with an undamaged ear. All sound pressur levels are positive numbers that illustrate how much louder a sound is than the threshold of hearing.

Sampling

Audacity bitrateThe intensity of the sound signal is measured at regular intervals which is called sampling. The more samples per second the greater the accuracy and quality of the recording. At each sampling point, the audio signal is assigned a specific intensity from a set range of values. CD quality sound is sampled at 44,100 samples per second or kHz. Digital Audio Tape (DAT) is capable of sampling at 32,000, 44,100, and 48,000 kHz. Other commonly used sampling rates are 22.05 kHz and 11.025 kHz.

Clipping

In Audacity, the levels in the digital audio signal are expressed in dB as measured by their relationship to 0 dB, the highest possible level. In digital audio, the signam can Audacity clippingnever exceed 0 dB. If it does, the peaks in the digital signal will be cut off or "clipped" at the 0 dB level. This clipping caused distortion and should be avoided. It's best to record in Audacity at levels of between -6 to -12 dB to be save. If you see your recording meter peaking and turning red, you should reduce your recording volume.

Bit-rates

Bit-rate refers to how many bits (digital 1s and 0s) are used each second to represent the sound signal. The bit-rate for digital audio is represented in thousands of bits per second (kbps) and is directly proportional to file size and sound quality. The higher bit-rate, the larger the file size and the better the sound quality. Lower bit-rates result in smaller files but poorer sound quality. The recommended bit-rate for recording in Audacity is 32 - bit.

 

 

 

 

 

 


Search for Tutorials
 

Audacity Tutorials : Recording and Editing with Audacity

Audacity Tutorials
Audacity Tips & Tricks

Getting Ready
to Record

Audacity Download
Audacity LAME
MP3 Encoder

Overview of Digital Audio
Scriptwriting for Audio
Microphone Selection
High Quality Voiceovers
Setting Preferences
Saving Projects

Toolbars & Menus

Toolbars and Controls
Docking Toolbars
Mixer Toolbar
Meter Levels
The Track Tools
The Track Menu
The File Menu
The Edit Menu
The View Menu
The Project Menu
The Generate Menu
The Effects Menu Part 1
The Effects Menu Part 2

Working with Audio

Audio Tracks and
Waveforms

Using the Label Track
Using the Time Track
Sound File Formats
Importing Audio
Fading Music Up
& Down

Exporting MP3 Files

 

 

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