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| MAS3507D MP3 Player on a chip |
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| The MAS3507D is a single-chip MPEG-1/2 layer 2/3 audio decoder for use in audio broadcast or memory-based playback applications. Due to embedded memories, the embedded DC/DC up-converter, and the very low power consumption, the MAS3507D is ideally suited for portable electronics. In MPEG 1 (ISO 11172-3), three hierarchical layers of compression have been standardized. The most sophisticated and complex layer 3 allows compression rates of approximately 12:1 for mono and stereo signals while still maintaining CD audio quality. Layer 2 (widely used in DVB, ADR, and DAB) achieves a compression of 8:1 providing CD quality. |
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| In order to achieve better audio quality at low bit rates (<64 kbit/s per audio channel), three additional sampling frequencies are provided by MPEG 2 (ISO 13818-3). The MAS3507D decodes both layer-2 and layer-3 bit streams as defined in MPEG-1 and 2. The multichannel/multilingual capabilities defined by MPEG-2 are not supported by the MAS3507D. An extension to the MPEG-2 layer-3 standard developed by FhG Erlangen, Germany, sometimes referenced as MPEG-2.5, for extremely low bit rates at sampling frequencies of 12, 11.025, or 8 kHz is also supported by the MAS3507D. |
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| The MAS 3507D can be applied in two major environments: in multimedia mode or in broadcast mode. For both modes, the DAC 3550A fits perfectly to the requirements of the MAS 3507D. It is a high-quality multi sample rate DAC (8 kHz ... 50 kHz) with internal crystal oscillator, which is only needed for generating the decoder clock, and integrated stereo headphone amplifier plus 2 stereo inputs | ||||||||||||||||||||
| Back to Electronic Components and Projects | ||||||||||||||||||||
| (c) 2005 Juriaan Massenza - All rights reserved. | ||||||||||||||||||||
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