Chapter 4: Sound

Essay Quiz

1.      I would approach this process by recording the interviews and editing them later.  I would remove the blank space or dead air, also known as trimming, to be able to hear the interviews clearer and better. 

2.      If you want to use someone else’s work, the first thing you need to do is identify exactly who owns the copyright in the song. Remember that sound recordings are made up of a number of elements which are protected under copyright law. Therefore, there may be a number of different copyright owners involved in one piece of work

3.      Sample rate*sample size/8*#seconds*channels =?KB  and It takes about 1.94 MB to store 11 seconds of uncompressed stereo sound.

4.      MIDI (Musical Instrument Digital Interface) is a protocol designed for recording and playing back music on digital synthesizers that is supported by many makes of personal computer sound cards.  Rather than representing musical sound directly, it transmits information about how music is produced.  An advantage is very small file size. A disadvantage is the lack of specific sound control.  With a program that provides this interface, you can create music using a standard keyboard or other input device.

5.      Step 1:  The file size in Bytes for a digital recording where the sampling rate is at the duration of recording in second (bit resolution/ 8) and number of tracks such as 1 for mono and 2 for stereo. It means to set the file size type before start to do any recording or editing.

Step 2:  Consumer-grade audio compact discs are recorded in Stereo at sampling rate of 44.1 kHz and a16-bit resolution. Other sampling rates include 22.05 and 11 kHz, at either 16 or bites. Then after setting the file size, the following will need to select the type of sampling rate for the video and sound clips.

Step 3:  Digital audio is not device dependent, and sound the same every time it is displayed. for this reason digital audio is used for more frequently than MIDI data for multimedia sound tracks. You can digitize sounds from any source, live or pre-recorded.

Step 4:  When recording (digitizing) audio, it's important to keep the recording level near the maximum without going over it. This is to keep the quality of the audio the highest and when compressing the video or copying the audio, it still can maintain high quality and wouldn't run away from the original quality.

Step 5:  Important steps in digital sound editing include removing blank space from the start and end of a recording and normalizing the sound to bring all clips to approximately the same level. This is to make ssure all space is used to the maximum and there wouldn't be extreme difference between the clips.

Step 6:  The native sound file formats for most Macintosh sound editting software are the SND and AIF formats, and most authoring systems will read these formats. in Windows, the native sound file format for most editting software is WAV file.

Step 7:  Many audio editors provide tools such as re-sampling, fade-in and fade-outs, equalization, time stretching, various digital signal processing effects and reversing sounds.

Step 8:  The value of each sample is rounded off to the nearest integer (quantization) and the preparation and programming required for creating digital audio do not demand knowledge of music theory.

Project 4.1

1. Audacity

Audacity is a free, easy-to-use, multi-track audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems. The interface is translated into many languages. You can use Audacity to:

·        Record live audio.

·        Record computer playback on any Windows Vista or later machine.

·        Convert tapes and records into digital recordings or CDs.

·        Edit WAV, AIFF, FLAC, MP2, MP3 or Ogg Vorbis sound files.

·        AC3, M4A/M4R (AAC), WMA and other formats supported using optional libraries.

·        Cut, copy, splice or mix sounds together.

·        Numerous effects including change the speed or pitch of a recording.


2. Wavosaur

This compact free audio editor and recorder doesn’t need to be installed and can run on Windows 98, XP, and Vista. It has a good set of tools for editing digital audio files, has several useful effects, and can handle MP3, WAV,OGG, aif, aiff, wavpack, au/snd, raw binary, Amiga 8svx & 16svx, ADPCM Dialogic vox, and Akai S1000 audio formats.


3. Wavepad Sound Editor

Wavepad Sound Editor is a feature-rich program that supports a good selection of file formats; this includes mp3, wma, wav, flac, ogg, real audio, and more. The program has all the familiar tools in order to edit audio files (cut,copy, and paste) and can use VST plugins to extend its capabilities. You can use it for noise reduction, click/pop removal, and adding effects like echo and reverb.