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Development of MPEG-I (Layer-I & layer-II) audio codecs
Development of MPEG-I (Layer 1 & 2) audio codecs
The DSP processor is a 16 bit fixed point processor which runs at 33 MHz. The performance parameters were as follows:
| Layer I | Layer II | |
|---|---|---|
| Processor loading | 64% ( 21 MIPs ) | 50% ( 16 MIPs ) |
| Program Memory | 1214 Words | 1500 Words |
| Data Memory | ||
| Internal | 096 Words | 4096 Words |
| External | 12256 Words | 20000 Words |
The encoder was tested against a standard reference decoder. The decoded output was tested for subjective quality by listening tests. It is also tested with tones with different power levels and output compared with input spectrum (Spectrum Matching).
| Layer I | Layer II | |
|---|---|---|
| Processor loading | 20% ( 6.6 MIPs ) | 19% ( 6.7 MIPs ) |
| Program Memory | 450 Words | 750 Words |
| Data Memory | ||
| Internal | 3330 Words | 3900 Words |
| External | 3072 Words | 9200 Words |