Data Compression


Criteria

Survey Formats

Basics

Compression Methods

Data Formats

Files

Audio Data

MPEG-1 Audio

MPEG-1 Layer I to III

Sampling and Bit Rate

Variable Bit Rates

Principle of the coding

Filter

Acoustic Model

Entropy Coding

Encoding (Diagram)

Image Data

Video Data


Glossary

Index


Download


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Sampling and Bit Rate


Equivalent to the common audio systems three different sampling rates are defined: 32, 44.1 and 48 kHz. They correspond with the audio sources radio (FM), CD and DAT.


Bit rates (data transfer rates) may be selected in a wide range. The internal header specification of MPEG allows the usage of the following rates:


IndexLayer ILayer IILayer III
0free formatfree formatfree format
132 kbit/s32 kbit/s32 kbit/s
264 kbit/s48 kbit/s40 kbit/s
396 kbit/s56 kbit/s48 kbit/s
4128 kbit/s64 kbit/s56 kbit/s
5160 kbit/s80 kbit/s64 kbit/s
6192 kbit/s96 kbit/s80 kbit/s
7224 kbit/s112 kbit/s96 kbit/s
8256 kbit/s128 kbit/s112 kbit/s
9288 kbit/s160 kbit/s128 kbit/s
10320 kbit/s192 kbit/s160 kbit/s
11352 kbit/s224 kbit/s192 kbit/s
12384 kbit/s256 kbit/s224 kbit/s
13416 kbit/s320 kbit/s256 kbit/s
14448 kbit/s384 kbit/s320 kbit/s

According to the specification there are some restrictions regarding the combination of bit rates and operation mode, which concern Layer II.


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MPEG-1 Audio MPEG-1 Layer I to III Variable Bit Rates