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Contents and Index

Index

Documentation and Help

1, About GoGo CD to MP3 Ripper

Welcome

Introduction

What Can GoGo CD to MP3 Ripper Do

Key Features

System Requirements

Version History

2, How To Start

Before the Installation

How to Install

Start UsingQuick Start Information

7, Appendix A: Frequently Asked Questions

Frequently Asked Questions

8, Appendix B: The Introduction and Comparison of Different Audio Formats

What is CD Audio Format

What is WAV Audio Format

What is MP3 Audio Format

What is WMA Audio Format

What is OGG Audio Format

The Comparison of Different Audio Formats 9, Appendix C: Glossary
 Glossary

 

 

 
Glossary


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

A

ABR
Average Bit Rate. In this mode, you choose the encoder will maintain an average bitrate while using higher bitrates for the parts of your music that need more bits. The result will be of higher quality than CBR encoding but the average file size will remain predictible, so this mode is highly recommended over CBR. This encoding mode is similar to what is reffered as vbr in AAC or Liquid Audio (2 other compression technologies).

B

Bitrate
It is the speed at which a bit stream (compressed audio data in this case) will travel, or the amount of bits per second.

C

CBR
Constant Bit Rate. It is the standard method used by most encoders. The same number of bits are added to each frame of the audio data. This is the default encoding mode, and also the most basic. In this mode, the bitrate will be the same for the whole file. It means that each part of your mp3 file will be using the same number of bits. The musical passage beeing a difficult one to encode or an easy one, the encoder will use the same bitrate, so the quality of your mp3 is variable. Complex parts will be of a lower quality than the easiest ones. The main advantage is that the final files size won't change and can be accurately predicted.

CD
Compact Disc. It is a type of storage media for storing large volume data.

CD Audio
Digial Audio Compact Disc. It is a type of storage media for storing audio meida data.

CD Ripper
Software that extracts CD audio tracks into audio streaming or files.

CD Text
A red book CD standard that allows album titles, artist names, and song titles to be embedded on an audio CD. Some CD players can read this data.

CD-R Compact Disc Recordable (CD-R) is a recording device that allows you to record data and audio CDs only one time.

CD-ROM A Compact Disc-Read Only Memory (CD-ROM) is designed to store data in the form of text, graphics and audio. CD-ROMs use the Yellow Book standard as published by Philips.

CD-RW Compact Disc Rewritable is an extension of CD-R whereby you can rewrite data or audio to the same CD multiple times.

CDDB An online based Compact Disc Database (CDDB) that allows you to download artist names, album titles, track names etc. This information is displayed in your MP3 player.

Channel
A separate "thread" of audio data, where each channel represents a stream of audio data that is to be delivered to an individual speaker.
Mono data contains one channel; stereo data contains two channels (left and right). There are also various multi-channel formats (e.g. 5-speaker).

Converter
Software that converts one format to another

D

Decoder
Software that transfer a compressed format into readable audio streaming

Dual-Channel
This is the same as stereo except that it fixes the bandwidth to each channel. eg. with a 128Kbit/s file, each channel will have exactly 64Kbit/s to allocate to various sound events. This is a really bad idea since you might have a song that is more active in the right channel, so it would require more bits, then there's the left channel that is really quiet but is still using 64Kbit/s and because the left channel is hogging bits it does not require, the right channel is not getting the bits it needs to sound reasonable. This mode is not used unless you have special requirements.

E

Encoder
Software that transfer readable audio streaming into other audio format

Extract
the process of ripping CD tracks to audio streaming.

F

Filter
A device that removes unwanted frequencies or noise from a signal.

Frequency
1. The number of sound waves that pass a given point in one second. 2. The determiner of pitch.

H

Hz (Hertz)
A unit of measure that equals one cycle per second.

I

ID3
Text included in some audio format like mp3 or ogg includes album, artist, track, year, genre, and other info.

J

J-Stereo (Joint Stereo)
The encoder encodes to a mid channel, which is just one full channel by itself that is averaged out from the two original channels, and a side channel which contains all of the stereo separation. Instead of encoding two full channels like with normal stereo, the encoder only has to encode one channel and part of another. Sometimes there is too much stereo separation for JS to reproduce, if such a situation occurs, the encoder will switch back to normal stereo.

Jack
A female input or output connector, usually for a mic or an instrument.

Jitter It is caused by the inability of many CD-ROM drives to accurately seek a specific sector on an audio CD therefore resulting in pops or clicks when listening to the ripped audio track.

L

LAME It is an open source MP3 encoder engine used in a large number of MP3 software titles.

Limiter
A device that electronically controls or "limits" the peak levels of program material.

M

Mixer
An electronic device that permits the combining of a number of inputs into one or more outputs. Mixers commonly provide a variety of controls - tone, volume, balance and effects - for each "channel."

Mono
It is a one-direction sound recording method. It is the mode for encoding audio data containing one channel.

MP3
MPEG Layer III, digital audio compression format for achieving smaller file sizes. A sound file that has been compressed through MP3 encoding, making the files smaller and easier to send across the Internet.

MP3 Converter
Software that converts WAV to MP3.

MP3 Decoder
Software that transfer MP3 format into readable audio streaming

MP3 Encoder
Software that transfer audio streaming into MP3 format

O

OGG
OGG Vorbis. It is free and open source audio codec. It is designed to compete with MP3.

Ogg Vorbis is a fully open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format for mid to high quality (8kHz-48.0kHz, 16+ bit, polyphonic) audio and music at fixed and variable bitrates from 16 to 128 kbps/channel. This places Vorbis in the same competitive class as audio representations such as MPEG-4 (AAC), and similar to, but higher performance than MPEG-1/2 audio layer 3, MPEG-4 audio (TwinVQ), WMA and PAC.

Vorbis is the first of a planned family of Ogg multimedia coding formats being developed as part of Xiph.org's Ogg multimedia project.

OGG Decoder
Software that transfer OGG Vorbis format into readable audio streaming

OGG Encoder
Software that transfer audio streaming into OGG Vorbis format

P

Phase The relationship of an audio signal or sound wave to a specific time reference.

Phase Shift The phase relationship of two signals at a given time, or the phase change of a signal over an interval of time.

Pitch Tone a function of frequency.

R

Reflection A term that describes the amount of sound "bouncing" off of hard surfaces.

Rejection A microphone's ability to selectively exclude sounds coming from outside it's pickup pattern.

Ripper
Software that digitally yanks tunes from your CDs and turns them into files on your computer (WAV files in Windows, AIFF files on a Mac).

S

Sample
An item of data that represents the audio amplitude at a given point in time. For example, audio data may be represented as either 8-bit or 16-bit, signed or unsigned. Other formats include various extended formats including 24-bit and IEEE floating point.

Sample Frame
An interleaved set of samples for individual channels, where every sample for a given channel within that sample frame corresponds to audio data from the same point in time. Each sample is defined in a given audio format. For example, 8-bit mono has one byte per sample frame, 8-bit stereo has two bytes per sample frame (one left channel, one right channel), 16-bit mono has two bytes per sample frame (signed or unsigned), 16-bit stereo has four bytes per sample frame (signed or unsigned : 16-bits for the left channel, then 16-bits for the right channel).

Sample Rate
The rate at which samples are represented, in terms of Sample Frames per second. Usually represented in Hertz (samples per second). For example, 11 KHz (11025 Hz), 22 KHz, (22050 Hz), 44 KHz (44100 Hz) etc. For the avoidance of doubt, 44 KHz 16-bit mono is 44100 sample frames per second (44100 samples per second, 88200 bytes), 44 KHz 16-bit stereo is 44100 sample frames per second (88200 interleaved left/right samples per second, 174000 bytes).

Signal An electrical impulse.

Sound Reinforcement The use of electronic devices to reinforce, alter or increase the level of sound.

Stereo
Identifies sound recording and reproduction by more than one (mono) channel. In home music reproduction, "stereo" came to mean two channels sound. In the film industry, however, "stereo" came to mean at least four channels (left, center, right, and surround).

V

VBR
Variable Bit Rate. Each frame's bitrates are changing between the min and max bitrates. It will use the best bitrates for each frame to get the best quality and the smallest size. In this mode, you choose the desired quality on a sqale from 9 (lowest quality/biggest distortion) to 0 (highest quality/lowest distortion). Then encoder tries to maintain the given quality in the whole file by choosing the optimal number of bits to spend for each part of your music. The main advantage is that you are able to specify the quality level that you want to reach, but the inconvenient is that the final file size is totally unpredictible.

VQF
A compression algorithm developed by Yamaha that is similar to MP3 yet occupies less hard drive space.

VQF Decoder
Software that transfer VQF format into readable audio streaming

VQF Encoder
Software that transfer audio streaming into VQF format

W

WAV
WAVE. Uncompressed audio format developed by IBM and Microsoft. It is standard audio streaming for processing with computers. An uncompressed Windows audio file. WAV files occupy an incredible amount of disk space, thus the need for compressed formats, such as MP3.

WMA
Windows Media Audio. Microsoft designed the audio codec to compete with MP3.

WMA Encoder
Software that transfer audio streaming into WMA format

WMA Decoder
Software that transfer WMA format into readable audio streaming

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z  




 
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