AT83SND2CMP3 datasheet(12/97 Pages) ATMEL

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AT83SND2CMP3

7524B–MP3–05/06

MP3 Decoder

The product implements a MPEG I/II audio layer 3 decoder better known as MP3

decoder.

In MPEG I (ISO 11172-3) three layers of compression have been standardized support-

ing three sampling frequencies: 48, 44.1, and 32 kHz. Among these layers, layer 3

allows highest compression rate of about 12:1 while still maintaining CD audio quality.

For example, 3 minutes of CD audio (16-bit PCM, 44.1 kHz) data, which needs about

32M bytes of storage, can be encoded into only 2.7M bytes of MPEG I audio layer 3

data.

In MPEG II (ISO 13818-3), three additional sampling frequencies: 24, 22.05, and 16 kHz

are supported for low bit rates applications.

The AT83SND2CMP3 can decode in real-time the MPEG I audio layer 3 encoded data

into a PCM audio data, and also supports MPEG II audio layer 3 additional frequencies.

Additional features are supported by the AT83SND2CMP3 MP3 decoder such as vol-

ume control, bass, medium, and treble controls, bass boost effect and ancillary data

extraction.

Decoder

Description

The core interfaces to the MP3 decoder through nine special function registers:

MP3CON, the MP3 Control register; MP3STA, the MP3 Status register; MP3DAT, the

MP3 Data register; MP3ANC, the Ancillary Data register; MP3VOL and MP3VOR, the

MP3 Volume Left and Right Control registers; MP3BAS, MP3MED, and MP3TRE, the

MP3 Bass, Medium, and Treble Control registers; and MPCLK, the MP3 Clock Divider

Figure 9 shows the MP3 decoder block diagram.

Figure 9. MP3 Decoder Block Diagram

MPEN

MP3CON.7

MP3

CLOCK

Audio Data

From C51

1K Bytes

MPxREQ

MP3STA1.n

Header Checker

Stereo Processor

Huffman Decoder

IMDCT

Side Information

ERRxxx

MP3STA.5:3

Sub-band

Synthesis

Decoded Data

To Audio Interface

Anti-Aliasing

MPFS1:0

MP3STA.2:1

Dequantizer

MPVER

MP3STA.0

MPBBST

MP3CON.6

MP3VOL

MP3VOR

MP3BAS

MP3MED

MP3TRE

Ancillary Buffer

MP3ANC

Frame Buffer

MP3DAT

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