Full Version: Critical sampling
What is critical sampling?
QUOTE(yesjoon @ Sep 6 2004, 05:20 PM)
What is critical sampling?
AFAIK this term mainly used when it comes to filterbanks for transform coding of digital signals. Critical sampling means that the amout of data (samples per second) remains the same in the transformed domain.
Critically sampled filterbank examples:
- PQMF filterbank of MPEG 1/2 Layer 1-3
- MDCT (MP3, AAC, Vorbis)
- Discrete Wavelet Transform (JPEG2000)
When it comes to coding of digital signals oversampled filterbank implementations (not critically sampled) don't make much sense because you have to code more samples per second compared to the original (non-transformed) signal.
Sebastian
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