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Audio Technologies

Compressed Media Format

Transmitting audio and data via satellite spawned the

need to create various formats of media compression.

These formats allow multiple signals to occupy the

same bandwidth as an uncommonly compressed

signal. This increased efficiency, reduces cost and

allows more data to be transmitted at higher speeds.

Clarion is at the forefront of compressed media file

playback. For 2010, Clarion offers support for AAC,

DivX, and MPEG compressed media files to our

already extensive list.

WAVE Format

WAVE (.wav) files are considered to be uncompressed.

This file format is used for the storage of 2-channel

audio in digital form. The file is stored in PCM (Pulse

Code Modulation) form and uses the standard 44,100

samples per second, 16-Bits per sample times two

channels. The resulting data rate is 1,411.2 kbps.

MP3 Format

MP3 files gained popularity due to their reduced file

size. MP3 stands for MPEG-1 Audio Layer 3. MP3

files use perceptual encoding to reduce files sizes

while limiting the effect on sound quality.

The MP3 standard allows for bitrates between 32 kbps

and 320 kbps with sampling rates of 32, 44.1 and 48

kHz. A higher bitrate represents less compression and

better (relative to the original) sound quality.

ID3 Tag Display

ID3 Tags were created and inserted at the end of an

MP3 file allow for the storage of metadata information

such as song title, artist, album name, genre, and year.

WMA Format

WMA (Windows Media Audio) is a compressed audio

file format created by Microsoft. It is very similar in

concept to MP3 files, but includes provisions for DRM

(Digital Rights Management).

Microsoft originally claimed that WMA files had better

sound quality than MP3 files recorded at the same

bitrate. Subsequent double-blind testing have repeat-

edly confirmed that the file formats are very similar.

AAC Format

AAC (Advanced Audio Coding) is another form of

compression and encoding format for digital audio.

The AAC format has been made popular as it is the

standard format for the Apple iPod.

AAC offers more sample and bitrate options as

compared to MP3 files. Sampling rates from 8 kHz to

to 96 kHz are available and up to 48 channels can be

encoded.

AAC happens to be the default audio codec used on

Playstation 3, PSP, Apple iTunes website, and iPod

products.

DivX

At the forefront of compressed

video technology is the DivX

codec. The latest version of this codec is

called DivX 6 (or DivX Media Format) reduces the file

size of digital movies while retaining support for multiple

audio tracks, interactive menus, chapter points, multiple

video streams, and subtitles.

For 2010, the Clarion NX700 (7” Double-DIN multimedia

station) and CMV1 (3.5” Marine multimedia station)

support the DivX Media Format in its native form. Offer-

ing high quality, fully interactive move playback. These

units are fully DivX Certified.

MPEG 1, 2, and 4

The Motion Picture Experts Group (MPEG) is a group

that overseas the development of video and audio

encoding standards. The various MPEG standards

outline the capabilities of each compression format.

MPEG-1

This was the initial audio and video compression stan-

dard and later became the standard for the Video CD. It

utilizes MP3 for the audio track.

MPEG-2

This is the standard format for audio and video broad-

casts for standard television. It is used for over the air

broadcast, as well as Dish Network, digital cable, and

some slight variations on DVDs.

MPEG-4

This is an expansion of MPEG-1 format and adds the

ability to support audio and video objects, low bitrate

encoding, 3-D content and support for Digital Rights

Management (DRM).

CD Text

CD Text is an extension of the standard audio CD format

and allows Album Name, Song Name, and Artist informa-

tion to be stored on a standard audio CD. Source units

bearing the CD Text Logo are

capable of displaying this in-

formation from compatible

discs. Not all store-bought

CD’s are encoded with CD Text information.

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Audio Technologies 1
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